JP2006038884A - Light quantity adjusting device and camera equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light quantity adjusting device which always surely drives a shading curtain and contributes to the reduction in cost and the increase in yield in spite of inexpensive constitution, and to provide a camera in which the light quantity adjusting device is mounted. <P>SOLUTION: A shutter device 21 is constituted by laminating an electrode substrate 25, a spacer 26, the shading curtain 27 and a glass substrate 28. A plurality of strip electrodes 29 for driving the shading curtain 27 are formed all over the back surface of the electrode substrate 25 except an optical aperture part 22 and a periphery part 31. The electrode substrate 25 is constituted of a glass epoxy substrate generally used as a printed board and comparatively inexpensively manufactured without necessitating a special process. The spacer 26 movably holds the shading curtain 27 between the electrode substrate 25 and the glass substrate 28. An electret polarized electrically at prescribed pitch is preapplied to the shading curtain 27. The glass substrate 28 has higher rigidity than the electrode substrate 25, and has flatness good enough to secure the flatness of the entire shutter device 21. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a light amount adjusting device that always drives a light-shielding curtain reliably with an inexpensive configuration and contributes to cost reduction and yield improvement, and a camera device 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. An embodiment is disclosed in which a strip-like electrode for driving a slider is provided on a glass epoxy substrate so as to function. (For example, refer to Patent Document 1.)
Japanese Patent Laid-Open No. 08-220592 ([Summary], FIG. 1, [0011], FIG. 2)

  In general, a resin material can be used as a substrate on which strip-like electrodes are provided, and can be manufactured at a lower cost. In particular, a glass epoxy substrate is generally used as a circuit substrate, and an inexpensive strip electrode substrate can be manufactured.

  However, in shutters and diaphragm devices, it is necessary to drive the light-shielding curtain at a high speed. For this purpose, the planarity of the strip electrode substrate is required. However, the resin material is warped in the usage state, particularly in a high-temperature and high-humidity environment. May occur, which may hinder smooth driving of the light-shielding curtain.

  An object of the present invention is to provide a light amount adjusting device that always drives a light-shielding curtain reliably while contributing to cost reduction and yield improvement, and a camera device equipped with the same, in view of the above-described conventional situation. It is.

  First, a light quantity adjusting device according to a first aspect of the present invention includes a light shielding curtain previously polarized at a desired interval, a strip-like electrode for driving the light shielding curtain, and an optical opening, and the light shielding curtain between each other. The first substrate is configured to have higher rigidity than the second substrate.

In this light quantity adjusting device, for example, the belt-like electrode for driving the light-shielding curtain is provided on either the first substrate or the second substrate.
Further, for example, the first substrate is made of a glass substrate, and the second substrate is made of a resin substrate.

Further, for example, the first substrate is made of a ceramic substrate, and the second substrate is made of a resin substrate.
For example, the first substrate is made of a metal substrate, and the second substrate is made of a resin substrate.

For example, a strip electrode for driving the light shielding curtain is provided on the resin substrate.
Further, for example, the first and second substrates may be made of the same material, and the first substrate may be configured to be thicker than the second substrate.

  Further, for example, a third substrate provided with the strip electrode for driving the light shielding curtain may be further provided. In this case, the third substrate is preferably a flexible substrate.

  Next, a camera device of a second invention is configured by providing the light amount adjusting device at a shutter position or an aperture position of an optical system.

  According to the present invention, since a substrate having higher rigidity than the other is used for either the first or second substrate, deformation of the substrate that hinders smooth movement of the light-shielding curtain is reduced. Accordingly, it is possible to provide a light amount adjusting device that contributes to cost reduction and yield improvement while always driving the light-shielding curtain reliably while having an inexpensive configuration, and a camera device including the same.

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

  FIG. 1 is a diagram showing a schematic configuration of a digital camera equipped with a shutter device as a light amount adjusting device of Embodiment 1, showing a perspective view showing an external appearance from the front of the digital camera, and showing the inside of the digital camera below. The perspective view which shows the arrangement | positioning state of the principal part of this 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.

  The XYZ arrows shown at the bottom of FIG. 1 indicate the direction of the width, depth, and height of the camera. The thinner the camera in the Y direction, the thinner the entire camera. The configuration is suitable for user-oriented miniaturization and thinning.

  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 movable lens unit 14, the third movable lens unit 16 with the lens held by the third movable lens frame 15, the second fixed lens unit 18 with the lens held by the second fixed lens frame unit 17, and these The image sensor 19 is arranged at the end of the lens unit.

  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 lower back side of the digital camera 1 in FIG. In FIG. 3, the 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 21 at the shutter position (aperture position) 20 shown in FIG. As shown on the right side of FIG. 3, the shutter device 21 is a device that forms a rectangular flat plate having a long side a and a short side b, and an optical aperture serving as a transmission path of the second optical axis O2. And a retracting portion 23 adjacent to the optical opening 22 in the long side a direction. The long side a is arranged in the X direction shown in the lower part of FIG. 1, and the short side b is arranged in the Y direction.

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.
FIG. 4 shows a perspective view of the shutter device 21 as seen from a different angle from the right of FIG. 3, shows an exploded perspective view at the center, and shows a view at the center a arrow below. .

FIG. 5 is a cross-sectional enlarged view of the shutter device 21 shown in FIG.
The shutter device 21 shown in FIGS. 4 and 5 includes the electrode substrate 25, the spacer 26, the light shielding curtain 27, and the first substrate as the second substrate shown in FIG. A glass substrate 28 as a substrate is laminated.

  On the back surface of the electrode substrate 25, as shown in the lower part of FIG. 4, a plurality of strip electrodes 29 for driving the light shielding curtain 27 are formed on the entire surface excluding the optical opening 22 and the peripheral portion 31. Has been.

The spacer 26 is provided between the electrode substrate 25 and the glass substrate 28 in order to hold the light shielding curtain 27 movably.
Although not clearly visible in the drawing, the light shielding curtain 27 is provided with electrets described later that are electrically polarized in advance at a predetermined pitch.

  The glass substrate 28 is transparent at least at a position corresponding to the optical opening 22 of the electrode substrate 25, has higher rigidity than the electrode substrate 25, and is excellent in flatness to ensure the flatness of the entire shutter device 21. It is used as a material of

  In this embodiment, the electrode substrate 25 having the strip electrode 29 is formed of a glass epoxy substrate generally used as a printed circuit board. Therefore, a special process is not required when the electrode substrate 25 is provided, and the electrode substrate 25 can be manufactured at a relatively low cost.

However, the glass epoxy substrate may be warped or bent due to the influence of temperature and humidity as described above, and in this case, there is a possibility of adversely affecting the movement of the light-shielding curtain 27 that moves at high speed.

Therefore, by integrally forming a glass substrate 28 having higher rigidity than the electrode substrate 25 which is a glass epoxy substrate and having excellent flatness, the light shielding curtain 27 is formed by deforming the rigidity and flatness following the glass substrate. To prevent the hindrance of driving.

  In this embodiment, the material of the first substrate is a glass substrate. However, the present invention is not limited to this, and a ceramic substrate, a metal substrate, or the like can also be used. However, when a light non-transparent material such as a ceramic substrate or a metal substrate is used, a physical through hole is formed at a position corresponding to the optical opening 22 of the electrode substrate 25 as an optical opening through which the light beam passes. Needless to say, it is necessary to provide the

  Further, the high rigidity mentioned here means that the product “EI” of the transverse elastic modulus “E” due to the material and the secondary moment of inertia “I” due to the shape (thickness) is large. That is, when the shape (thickness) is the same, the material has a large transverse elastic modulus, b: when the material is the same, the thickness is thick, that is, the value of the moment of inertia is large, c: the material and When the thicknesses are different, the product of the transverse elastic modulus and the secondary moment of inertia is large.

Also, “excellent flatness” means that the flatness on the geometrical tolerance is small and the value of the surface roughness (for example, Rmax) is small.
Here, the driving principle of the shutter mechanism for driving the light shielding curtain 27 in the shutter device 21 in this example will be described.

  FIG. 6 is a diagram for explaining the driving principle of the shutter mechanism in the shutter device of the present invention. In the following description of the driving principle, the term “stator 25” is used instead of the electrode substrate 25, and the term “moving element 27” is used instead of the light-shielding curtain 27.

  The shutter mechanism basically includes a stator 25 and a mover 27. The mover 27 is configured to be movable in the left-right direction with respect to the stator 25 as shown in the upper and lower parts of FIG. The stator 25 is provided with an opening (optical opening 22) 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 29 are formed side by side at a predetermined interval. The other moving element 27 is a light-shielding member and has a permanently polarized dielectric part. Such a configuration of the moving element 27 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 29, an attractive force or a repulsive force is generated between the belt-like electrode 29 and the electret of the slider 27. As a result, the slider 27 is It moves relative to the stator 25.

  Therefore, the shutter mechanism can be configured by allowing the movable element 27 to move so as to open or shield the opening (optical opening 22) of the stator 25. The upper part of FIG. 6 shows a state where the shutter is open, and the lower part of FIG. 6 shows a state where the shutter is closed. Hereinafter, the shutter mechanism according to this configuration will be referred to as an “electret shutter”.

  The opening of the stator 25 (optical opening 22) is not necessarily a physical opening such as a through-hole, and the stator 25 is used as a transmission member, and a band-like shape is formed at a position corresponding to the opening. A transmissive region where the electrode 29 is not provided may be formed.

  FIG. 7 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 32 is connected to each strip electrode 29 arranged on the stator 25. A four-phase voltage signal is applied to the voltage signal line. Therefore, the same voltage signal is applied to the strip electrode 29 every four lines. In FIG. 7, the voltage signals are distinguished by attaching the symbols A, B, C, and D to the strip electrode 29.

  A moving element 27 is arranged so as to face the arrangement surface of the band-like electrode 29 of the stator 25. The mover 27 includes a plurality of the above-described dielectrics (electrets) 33 that are permanently polarized on the surface facing the stator 25.

  In the drive circuit 32 shown on the left side of the figure, the pulse generation circuit 34 generates a rectangular wave train (drive pulse signal), and this drive pulse signal is supplied to the booster circuit 35 and the phase shifter 36. The booster circuit 35 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 36 has a waveform delayed by 90 °, and is then input to the booster circuit 35 and branched into voltage signals having the same two polarities as described above to drive electrode B And D.

  FIG. 8 is a diagram showing a voltage signal sequence generated by the drive circuit 32 and applied to the strip electrode 29. Regarding the voltage state of the strip electrode 29, four state changes from t1 to t4 in the period T are repeated in correspondence with the passage of each period T in the time t.

  FIG. 9 is a diagram for further explaining the operation of the electret shutter. (1) in FIG. 9 shows the electret and drive electrode immediately after the voltage state of each strip electrode 29 (A, B, C, D) in FIG. 8 is switched to the state of the applied voltage at t1 shown in FIG. The correspondence relationship is shown.

  The electret 33 a receives a repulsive force from the drive electrode A and receives an attractive force from the drive electrode B. Further, the electret 33 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 27 receives a force in the right direction in the drawing and moves by one drive electrode pitch d.

  (2) in FIG. 9 shows the correspondence relationship between the electret and the drive electrode immediately after switching to the state of the applied voltage at t2 shown in FIG. 8 following the above. The electret 33a receives a repulsive force from the drive electrode B and receives an attractive force from the drive electrode C. The electret 33 b receives a repulsive force from the drive electrode D and receives a suction force from the drive electrode A. For this reason, the moving element 27 receives a force in the right direction in the figure and moves again by one drive electrode pitch d.

  (3) in FIG. 9 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. 8 following the above, and (4) in FIG. (3) Next, the correspondence relationship between the electret and the drive electrode immediately after switching to the applied voltage state at t4 shown in FIG. 8 is shown. Similar to the operations described in (1) and (2) of FIG. 9, the moving element 27 sequentially moves by one driving electrode pitch d.

  Then, by repeating this operation, the mover 27 moves to the right in FIG. In order to move the movable element 27 in the left direction in FIG. 9, the polarity of the voltage applied to the strip electrode 29 may be switched in reverse.

  As described above, the movable element 27 of this example itself includes 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. 10 shows a perspective view of the shutter device as the second embodiment, shows an exploded perspective view in the center, and shows a view in the middle of the arrow b below. The lens device in which the shutter device is incorporated is the same as the lens device 7 shown in FIGS. 2 and 3 below FIG.

  FIG. 11 is a cross-sectional view of the shutter device 21 ′ shown in FIG. 10 and 11, the same components as those in FIG. 4 are denoted by the same reference numerals as those in FIG.

  The shutter device 21 'shown in FIGS. 10 and 11 includes an electrode substrate 25 having a strip electrode 29, a spacer 26, and an electret as a second substrate shown in FIG. The light shielding curtain 27 and the thick substrate 28 ′ as the first substrate which is the same material and thicker than the electrode substrate 25 are laminated.

  Since the thick substrate 28 ′ is an opaque substrate made of the same material as the electrode substrate 25, an optical opening made of a physical through hole is formed at a position corresponding to the optical opening 22 of the electrode substrate 25 in the same manner as the electrode substrate 25. 37 is formed.

  The thick substrate 28 'is made of the same material as the electrode substrate 25, but the thickness d1 of the thick substrate 28' is thicker than the thickness d2 of the electrode substrate 25, that is, d1> d2, so that the thicker substrate 28 'is thicker. The substrate 28 ′ has higher rigidity than the electrode substrate 25. With such a configuration, the rigidity of the entire light amount adjusting device is increased, and a substrate configuration with excellent flatness and less deformation can be obtained.

  FIG. 12 shows a perspective view of the shutter device as the third embodiment on the upper side, an exploded perspective view on the center, and a lower side view on the arrow c. The lens device in which the shutter device is incorporated is the same as the lens device 7 shown in FIGS. 2 and 3 below FIG.

  13 is an enlarged arrow view taken along the line DD ′ of the shutter device 21 ″ shown in FIG. 12. Note that in FIG. 12 and FIG. 13, the same components as those in FIG. Is given.

  As shown in FIGS. 12 and 13, the shutter device 21 ″ includes an electrode substrate 25 having a strip electrode 29 as a second substrate shown in FIG. 12 from the lower left to the upper right of the center, and from left to right in FIG. 38, a light shielding curtain 27 provided with electrets, and a glass substrate 28 as a first substrate are laminated.

  The holding frame 38 has an optical opening 39 formed of a physical through hole at a position corresponding to the optical opening 22 of the belt-like electrode 29, and a frame edge step around the surface 41 facing the light shielding curtain 27. A portion 42 is formed, and a light shielding curtain chamber 43 is formed by the frame edge step portion 42, the facing surface 41 and the glass substrate 28.

  The holding frame 38 is movable in the light shielding curtain chamber 43 between a position where the light shielding curtain 27 is retracted from the optical openings 22 and 39 and a position covering the optical openings 22 and 39. And sandwiched between.

  In this embodiment, since the electrode substrate 25 having the strip electrode 29 is formed of a glass epoxy substrate generally used as a printed board, no special process is required when providing the strip electrode 29. Therefore, it can be manufactured at a relatively low cost.

  However, since the glass epoxy substrate is likely to warp or bend due to the influence of temperature and humidity as described above, there is a possibility that the movement of the light-shielding curtain 27 moving at a high speed may be adversely affected. Since the light shielding curtain chamber 43 is formed by the holding frame 38 and the glass substrate 28, and the light shielding curtain 27 is movably sandwiched in the light shielding curtain chamber 43, the light shielding curtain 27 due to warping or bending of the electrode substrate 25 or the like. The adverse effect on the movement of can be prevented.

  FIG. 14 shows a perspective view of a shutter device as Example 4 in the upper left, an exploded perspective view from the lower left to the upper right, and a d arrow view of the exploded perspective view in the lower right. This embodiment shows a configuration of a shutter device that can control an optical aperture to an arbitrary size by two light shielding curtains.

  FIG. 15 is an enlarged view taken along the line E-E ′ of the shutter device shown in the upper left of FIG. 14. As shown in FIGS. 14 and 15, the shutter device 45 includes a first electrode substrate 46, a first holding frame 47, a first light shielding curtain 48, a central substrate 49, a second light shielding curtain 51, and a second light shielding curtain 51. The pressing frame 52 and the second electrode substrate 53 are laminated.

  The first electrode substrate 46 includes an optical opening 54 provided at a position slightly offset from the center in the longitudinal direction, a plurality of positions formed above and below the optical opening 54 and a light shielding curtain retracting position. A strip-shaped electrode 55 and a positioning hole 56 formed in the vicinity of two diagonal portions are provided. The configuration of the second electrode substrate 53 is also the same.

  The first and second holding frames 47 and 52 include optical openings 57 at positions corresponding to the optical openings 54 of the first and second electrode substrates 46 and 53, respectively. Positioning protrusions 58 are provided at positions corresponding to the positioning holes 56 of the first and second electrode substrates 46 and 53 on the surfaces facing the electrode substrates 46 and 53. However, in the second pressing frame 52 of FIG. 14, the surface facing the second electrode substrate 53 is the side facing the drawing, so that the positioning projection 58 is not visible behind the drawing.

  Further, the first and second pressing frames 47 and 52 are each formed with a frame edge step portion 61 around the surface 59 facing the central substrate 49. However, in the first pressing frame 47 of FIG. 14, the surface facing the central substrate 49 is the side facing the figure, so the facing surface 59 and the frame edge stepped portion 61 are not visible in the shade.

  As shown in FIG. 15, the light shielding curtain chamber 62 is formed in the shutter device 45 by the facing surface 59, the frame edge step portion 61, and the central substrate 49, as shown in FIG. 15. And the 2nd light-shielding curtains 48 and 51 are accommodated so that a movement is possible. The first and second light-shielding curtains 48 and 51 are respectively provided with electrets.

  By fitting the positioning hole 56 of the first electrode substrate 46 into the positioning protrusion 58 of the first pressing frame 47 formed as described above, the first pressing frame 47 can be easily compared with the first pressing frame 47. The position of the electrode substrate 46 can be adjusted. Similarly, the positioning hole 56 of the second electrode substrate 53 is fitted into the positioning protrusion 58 (not visible in the figure) of the second pressing frame 52, so that the second pressing frame 52 can be easily simplified. In addition, the position of the second electrode substrate 53 can be adjusted.

  As described above with the first and second pressing frames 47 and 52, the central substrate 49 that forms the light-shielding curtain chamber 62 has an optical opening 63 formed at the center thereof. The first substrate 46 and the holding frame 47 and the second substrate 53 and the holding frame 52 are configured so that the length in the longitudinal direction is shorter than that of the central substrate 49, and their optical openings 54 and 57. The first substrate 46 and the holding frame 47 are offset to the right in the longitudinal view, and the second substrate 53 and the holding frame 52 are offset to the left in the longitudinal view.

  Therefore, when the upper members are laminated so that the centers of these optical openings 63, 54 and 57 coincide with each other to complete the shutter device 45 as shown in the upper left of FIG. 14, the first substrate 46 and The holding frame 47 coincides at the left end with respect to the central substrate 49 and forms a non-engaging surface on the right side of the central substrate 49. Further, the second substrate 53 and the holding frame 52 are arranged so as to coincide with each other at the right end with respect to the central substrate 49 and form a non-engaging surface on the left side of the central substrate 49.

  This is because, as shown in the lower left and upper right of FIG. 14, both the first substrate 46 and the second substrate 53 are connected to the light shielding curtain 48 in order to reduce the amount of use of the members that form the electrode substrate and the holding frame. 51 includes a portion that moves to a position that covers the optical opening 54 and a position that retreats, but an extra portion that is a non-moving position of the light-shielding curtain 48 or 51 (a position where the belt-like electrode 55 is not disposed). Has a configuration other than the portion where one of the two positioning holes 56 is formed.

  FIG. 16 is a front view of a camera body on which the shutter device according to the fifth embodiment is mounted and its interchangeable lens. The camera main body 64 shown in the upper part of FIG. 16 shows an internal configuration in which the interchangeable lens 66 shown in the lower part of FIG.

  In the internal configuration shown in FIG. 16, a focal plane shutter device 67 applying the shutter device according to the fourth embodiment of the present invention is incorporated in the vicinity of the subject side of the focal plane. In the upper part of FIG. 16, the central portion of the focal plane shutter device 67 is visible.

  In addition, in the figure shown on FIG. 16, in order to make it easy to show the focal plane shutter device 67, the illustration of the quick return mirror that is originally arranged in front of it is omitted. The camera body 64 has a grip portion 68 that also serves as a battery chamber on the left side of the figure, and has a shutter button 69 on the top surface thereof.

  FIG. 17 shows a perspective view of the above focal plane shutter device 67 at the upper left, and an exploded perspective view from the lower left to the upper right. As shown in FIG. 17, the focal plane shutter device 67 includes a flexible substrate front portion 71-1, a first pressing frame 72, a first light shielding curtain 73, a central substrate 74, a second light shielding curtain 75, and a second light shielding curtain 75. The holding frame 76 and the flexible substrate front portion 71-2 are stacked.

  The front portion 71-1 and the rear portion 71-2 of the flexible substrate are continuous substrates. As shown in the upper left of FIG. 17, one end portion in the longitudinal direction of another member laminated inside ( In the figure, the upper left end portion) is laminated from the front side to the rear side so as to be stacked on the foremost part and the rearmost part.

  A first strip electrode 77 for driving the first light-shielding curtain 73 is disposed on the flexible substrate front portion 71-1, and an optical opening 78 is formed at the center. Similarly, a second strip electrode 79 for driving the second light-shielding curtain 75 is disposed in the flexible substrate rear portion 71-2, and an optical opening 81 is formed in the central portion.

  Each of the first and second pressing frames 72 and 76 has a frame edge step portion 83 formed around the surface 82 facing the central substrate 74. However, in the first pressing frame 72 of FIG. 17, the opposing surface to the central substrate 74 is the side surface facing the figure, so the opposing surface 82 and the frame edge step portion 83 are not visible in the shade.

  Also in this case, the opposing surface 82, the frame edge step portion 83, and the central substrate 74 form two light shielding curtain chambers similar to the light shielding curtain chamber 62 shown in FIG. The first and second light shielding curtains 73 and 75 are movably accommodated in the two light shielding curtain chambers, respectively. The first and second light-shielding curtains 73 and 75 are respectively provided with electrets.

  In the present embodiment, as described above, the electrode substrate for driving the first and second light-shielding curtains 73 and 75 is composed of a series of flexible substrates including a flexible substrate front portion 71-1 and a rear portion 71-2. Therefore, the electrode substrate can be manufactured with a single flexible substrate, and the connection portion 71-3 with the drive circuit can be formed integrally with the electrode substrate. It can contribute to improvement.

  Also in this example, as in the above-described fourth embodiment, positioning protrusions are formed on the first and second holding frames 72 and 76, positioning holes are provided on the flexible substrate side, and both are combined. Then, it goes without saying that the assembly is further improved.

  Moreover, since the center board | substrate 74 of this example is a ceramic board | substrate, rigidity and planarity can fully be maintained.

1 is an external perspective view showing a schematic configuration of a digital camera equipped with a shutter device as a light amount adjusting device of Embodiment 1, and a perspective view showing an arrangement state of main parts. It is the figure which looked at the AA 'arrow cross section of the lens apparatus shown under FIG. 1 from the left side of the digital camera, and is a figure which shows the schematic structure of each part of a lens unit. It is the expansion perspective view which looked at the lens apparatus from the back side of the digital camera, and the figure which shows independently the shutter apparatus assembled | attached to the lens apparatus. It is the perspective view seen from the angle different from the right of FIG. 3 of a shutter apparatus, the disassembled perspective view, and the a arrow view of an exploded perspective view. It is a BB 'cross-sectional enlarged arrow view of the shutter apparatus shown on the top of FIG. It 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 and its drive circuit concerning the 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. FIG. 7 is a perspective view, an exploded perspective view, and a b arrow view of an exploded perspective view of a shutter device as a second embodiment. FIG. 11 is a cross-sectional view of the shutter device shown in the upper part of FIG. FIG. 9 is a perspective view, an exploded perspective view, and an exploded perspective view of the shutter device as the third embodiment. FIG. 13 is a DD ′ cross-sectional enlarged arrow view of the shutter device shown in FIG. FIG. 10 is a diagram illustrating a configuration of a shutter device that can control an optical aperture to an arbitrary size by using two light-shielding curtains as a modification of the third embodiment. It is an EE 'cross section enlarged arrow view of the shutter apparatus shown in the upper left of FIG. FIG. 10 is a front view of a camera body on which a shutter device (focal plane shutter device) as Example 5 is mounted and its interchangeable lens. It is a figure which shows the perspective view and exploded perspective view of a focal plane shutter apparatus.

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 16 Second fixed lens frame unit 18 Second fixed lens unit 19 Image sensor 20 Shutter position (aperture position)
DESCRIPTION OF SYMBOLS 21 Shutter apparatus 22 Optical opening part 23 Retraction | saving part 25 Electrode substrate (1st board | substrate)
26 Spacer 27 Light-shielding curtain 28 Glass substrate (second substrate)
28 'thicker substrate (second substrate)
29 Belt electrode 31 Peripheral part 32 Drive circuit 33 Dielectric (electret)
34 Pulse generation circuit 35 Booster circuit 36 Phaser 37 Optical opening 38 Pressing frame 39 Optical opening 41 Opposing surface 42 Frame edge stepped portion 43 Shading curtain chamber 45 Shutter device 46 First electrode substrate 47 First pressing frame 48 First light-shielding curtain 49 Central substrate 51 Second light-shielding curtain 52 Second pressing frame 53 Second electrode substrate 54 Optical opening 55 Band-shaped electrode 56 Positioning hole 57 Optical opening 58 Positioning protrusion 59 Central substrate and Opposite face 61 frame edge step portion 62 light shielding curtain chamber 63 optical opening 64 camera body 65 interchangeable lens mounting portion 66 interchangeable lens 67 focal plane shutter device 68 grip portion 69 shutter button 71-1 flexible substrate front portion 71-2 flexible Substrate front portion 71-3 Connection portion with drive circuit 72 First holding frame 73 First light shielding Curtain 74 Central substrate 75 Second light shielding curtain 76 Second pressing frame 77 First strip electrode 78 Optical opening 79 Second strip electrode 81 Optical opening 82 Opposite surface with central substrate 83 Frame edge step

Claims (10)

First and second light shielding curtains that are polarized in advance at a desired interval, a strip electrode for driving the light shielding curtain, and an optical opening that movably holds the light shielding curtain between each other. A light amount adjusting device having a substrate,
The light quantity adjusting device, wherein the first substrate has higher rigidity than the second substrate.   2. The light quantity adjusting device according to claim 1, wherein the belt-like electrode for driving the light-shielding curtain is provided on either the first substrate or the second substrate.   The light quantity adjusting device according to claim 1, wherein the first substrate is made of a glass substrate, and the second substrate is made of a resin substrate.   The light quantity adjusting device according to claim 1, wherein the first substrate is made of a ceramic substrate, and the second substrate is made of a resin substrate.   The light quantity adjusting device according to claim 1, wherein the first substrate is made of a metal substrate, and the second substrate is made of a resin substrate.   6. The light quantity adjusting device according to claim 3, wherein a belt-like electrode for driving the light shielding curtain is provided on the resin substrate.   The light quantity adjusting device according to claim 1, wherein the first and second substrates are made of the same material, and the first substrate is thicker than the second substrate.   The light quantity adjusting device according to claim 1, further comprising a third substrate provided with the strip electrode for driving the light shielding curtain.   The light quantity adjusting device according to claim 9, wherein the third substrate is a flexible substrate. A camera apparatus comprising the light amount adjusting device according to claim 1 provided at a shutter position or an aperture position of an optical system.

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