JP4559771B2 - Light amount adjusting device and imaging device provided with the same - Google Patents

Description

  The present invention relates to a light amount adjusting device such as a shutter device or a diaphragm device that is incorporated in an imaging device such as a digital camera or digital binoculars and that is driven to open and close at high speed to adjust the amount of imaging light, and an imaging device using the same.

  In general, a light amount adjusting device such as a shutter that controls opening and closing of an imaged light amount of a camera device or a diaphragm that adjusts the amount of light is arranged to block a photographing light or adjust the size of an aperture by arranging a blade member in an optical path from a subject. Widely known as

  Conventionally, the blade member is attached to a substrate having an exposure opening, and this opening is connected to a driving device so as to restrict opening / closing or restricting the opening diameter. The blade member is formed of a thin metal plate or resin film, and is pivotally supported on the periphery of the exposure opening formed on the substrate or supported by the guide member so as to be slidable.

  For example, Patent Document 1 discloses a structure in which a shutter blade that shields an exposure opening and a diaphragm blade that restricts the opening diameter are rotatably mounted. Referring to FIG. 6, the light quantity adjusting device known from this Patent Document 1 will be described. The shutter blade is composed of two blades 121 and 122 shown in the drawing (hereinafter referred to as light amount adjusting blades) so as to rotate in opposite directions. It has become. The light quantity adjustment blades 121 and 122 are supported so as to rotate about the rotation shafts 121a and 122a, respectively, and are formed in the elongated hole portion 121b formed in the light quantity adjustment blade 121 and the other light quantity adjustment blade 122. The operating pin 105b of the drive motor 105 is engaged with the elongated hole portion 122b.

  Further, the operating pin 105b of the drive motor 105 rotates counterclockwise around the motor shaft center 105a. As a result, the light quantity adjustment blade 121 turns counterclockwise about the rotation shaft 121a, and the other light quantity adjustment blade 122 turns clockwise about the rotation shaft 122a. Is changed from the open state to the closed state, and the open aperture 104 formed in the main plate 100 is closed. Further, when the operating pin 105b of the drive motor 105 rotates clockwise about the motor shaft center 105a, the pair of light quantity adjusting blades 121 and 122 rotate from the closed state to the open state, and the open aperture 104 is fully opened. . In this case, the distance between the operating pin 105b of the drive motor 105 and the motor shaft center 105a and the distance between the long hole portions 121b and 122b of the pair of light quantity adjusting blades 121 and 122 and the rotation shafts 121a and 122a are substantially equal. Therefore, the pair of light quantity adjusting blades 121 and 122 are rotated in the opposite direction by substantially the same angle as the angle at which the operating pin 105b of the drive motor 105 rotates about the motor shaft center 105a.

  For example, Patent Document 2 is known as a light amount adjusting device similar to that of Patent Document 1 described above. This will be described with reference to FIG. 7. The shutter blade is composed of a pair of blade members. The light quantity adjusting blades 210 and 220 can be opened and closed around rotation holes 210a and 220a fitted to the fulcrum shaft 200a of the base plate 200, respectively, and a long hole portion 210b formed in the light quantity adjusting blade 210, and The operation pin 205b of the drive motor 205 is engaged with the elongated hole 220b formed in the other light quantity adjustment blade 220.

  Further, the operating pin 205b of the drive motor 205 rotates clockwise about the motor shaft center 205a. As a result, the light quantity adjustment blade 210 rotates clockwise around the rotation hole 210a fitted to the fulcrum shaft 200a of the main plate 200, and the other light quantity adjustment blade 220 rotates to fit the fulcrum shaft 200a of the main plate 200. It turns counterclockwise around the hole 220a, and the pair of light quantity adjusting blades 210, 220 change from the open state to the closed state, and the open aperture 204 formed in the main plate 200 is closed. Further, when the operating pin 205b of the drive motor 205 rotates clockwise about the motor shaft center 205a, the pair of light quantity adjusting blades 210 and 220 rotate from the closed state to the open state, and the open aperture 204 is fully opened. .

  In this case, the difference from the above-mentioned Patent Document 1 is that the pair of light quantity adjusting blades 210 and 220 are supported rotatably around the fulcrum shaft 200a of the same base plate 200, and the fulcrum shaft 200a is paired with the drive motor 205. The light amount adjusting blades 210 and 220 are arranged at positions closer to the optical axis than the connecting portion where the driving pin 205b is fitted. As a result, the rotation angle of the drive pin 205b of the drive motor 205 is amplified, and the pair of light amount adjusting blades 210 and 220 are amplified and rotated, so that the pair of light amount adjusting blades 210 and 220 move at a high speed by the amplified amount. It becomes. As described above, both of the light amount adjusting devices of Patent Document 1 and Patent Document 2 connect the transmission arm attached to the rotating shaft of the drive motor and the blade member by pin-slit coupling.

Therefore, the opening / closing speed of the blade member is determined by the distance between the rotation shaft of the motor and the slit hole of the blade member, the distance between the rotation center axis of the blade member and the slit hole, and the cam shape of the slit hole.
JP 2002-287207 A Japanese Patent Laid-Open No. 2001-075146

  For example, when the shutter blades are opened and closed at high speed in an imaging device such as a camera, the structure of the above-mentioned Patent Document 1 requires that the drive motor be driven at high speed. In addition, even if the transmission arm connected to the drive motor amplifies the momentum and opens and closes the blade at high speed as in the above-mentioned Patent Document 2, the blade mounting position, the transmission arm and blade engagement position There has been a problem that the apparatus becomes large. Therefore, when the above-described structure is adopted in a light amount adjusting device that requires a high shutter speed at the same time as downsizing of a device such as a recent digital camera, there is a problem that the device becomes large and power consumption increases.

  Therefore, the main subject of the present invention is to provide a light amount adjusting device that can open and close the blade member at high speed by the rotation of the drive motor, and has a small structure and low power consumption, and an imaging device using the same. Yes.

The present invention adopts the following configuration in order to achieve the above-mentioned problems.
According to a first aspect of the present invention, a substrate having an exposure opening is disposed in an optical path of a camera device or the like, and a blade member such as a shutter or a diaphragm for restricting opening / closing of the exposure opening is disposed on the substrate. A drive device having a rotor having a rotating shaft on the substrate and an exciting coil for driving and rotating the rotor is provided. The transmission means for transmitting the rotation of the rotor of the driving device to the light quantity adjusting blade is configured as follows. The transmission means is connected to a rotating shaft of the rotor and swings about a rotating shaft, and the first transmission member is connected to the first transmitting member and swings about a support shaft different from the rotating shaft. The light quantity adjusting blade is pivotally supported by one of the first transmission member and the second transmission member and connected to the other by pin-slit coupling. To do. In this case, a first operating pin is formed on the first transmission member, a second operating pin is formed on the second transmission member, and the first operating pin is formed on the second transmission member. The support shaft of the second transmission member is disposed between the second operating pin and the slit hole. This makes it possible to open and close the blade member at high speed and smoothly without configuring the drive device to be large and consume high power.

Further, the pin-slit coupling is formed by fitting the first operating pin provided in the first transmission member and the slit hole provided in the light quantity adjustment blade to each other, thereby configuring the transmission member and the blade. Is easy to process. Further, the first transmission member is formed integrally with the rotor, and a first operating pin that is swingable about the rotation shaft of the rotor is provided, and a slit hole that engages with the first operating pin is provided. It is possible to transmit the movement of the rotor to the second transmission member via the first transmission member by providing the second transmission member, thereby simplifying the drive transmission system.

  According to a fourth aspect of the present invention, the blade member according to the first aspect of the present invention is constituted by a single blade, and a rotor having a rotation shaft, an excitation coil for driving and rotating the rotor, and rotation of the rotor is controlled by the light quantity. Transmission means for transmitting to the adjusting blade is provided, and this transmission means is configured as follows. First and second transmission members having different rotational axes at a distance from each other are provided. For example, the first transmission member is constituted by the same rotation shaft as the rotation shaft of the rotor, and the second transmission member is supported by providing a support shaft on the substrate, for example, so as to be rotatable at a distance. The first transmission member is a first operating pin that swings around the rotation axis of the rotor, and the second transmission member is a slit hole that engages with the first operating pin and the rotation of the rotor. A second operating pin that swings about a rotation axis different from the axis. The blade member is provided with a slit hole that engages with the first operating pin, and is pivotally supported by the second operating pin. With this configuration, the same result as in the first aspect of the invention can be obtained.

  According to a fifth aspect of the present invention, there is provided a photographic lens that forms an image of photographic light on an image pickup means, a substrate that is disposed in an optical path leading to the image pickup means and that has an exposure opening, and an opening and closing restriction that is disposed on the substrate and that opens the exposure opening. A rotor having a rotating shaft, an excitation coil for driving and rotating the rotor, and a transmission means for transmitting the rotation of the rotor to the light quantity adjusting blade. In such a configuration, the transmission means is connected to the rotary shaft of the rotor and the first transmission member swings around the rotary shaft, and the support shaft is connected to the first transmission member and is different from the rotary shaft. And the light quantity adjusting blade is pivotally supported by one of the first transmission member and the second transmission member and pivotally supported by the other. It is possible to provide an imaging apparatus capable of high-speed movement of the blade member by being connected by slit coupling.

  In the present invention, when the blade member is provided on the substrate having the exposure opening so as to be freely opened and closed, the rotation amount of the rotor shaft is increased by the first and second transmission members connected to the drive rotor, and is transmitted to the blade member. The blade member can be opened / closed at high speed. At the same time, the structure for this purpose is smaller than when the arm length of the conventional transmission member is increased because the transmission member that serves as the pivot point of the blade member and the transmission member that rotates the blade member are simultaneously moved in opposite directions. And it can be configured compactly.

Hereinafter, the present invention will be described based on the preferred embodiments shown in the drawings.
FIG. 1 is an exploded perspective view showing a light amount adjusting device incorporated in the image pickup apparatus of the present invention, FIG. 2 is a schematic diagram for explaining the operation states of the diaphragm blade member and the shutter blade member of the image pickup device, and FIG. FIG. 4 is a block diagram showing a control system in the image pickup apparatus of the present invention, and FIG. 5 is a frame in the image pickup apparatus of the present invention. It is an operation | movement flow at the time of imaging | photography.

  First, the light quantity adjusting device of the present invention will be described. The device shown in FIG. 1 is configured as a unit in which a shutter blade member E and a diaphragm blade member C are incorporated in an apparatus substrate (hereinafter referred to as a ground plate) F. A driving means H for the shutter blade member E and a driving means G for the aperture blade member C are attached.

  D in the figure is an intermediate plate (partition plate) that divides the shutter blade member E and the diaphragm blade member C, and S in the drawing is a shutter blade member E and a driving means H for opening and closing the shutter blade member E at high speed. B is a connecting means for driving connection, and B in the figure is arranged on the base plate F in the order of shutter connecting means S (second transmission lever described later), shutter blade member E, intermediate plate (partition plate) D, and diaphragm blade member C. It is a pressing plate that holds the state. This light quantity adjusting device has the following configuration and is incorporated in an imaging lens of an imaging device described later.

  Therefore, the base plate F is formed by molding of resin or the like, and is configured in an appropriate shape to attach and support the shutter blade member E, the diaphragm blade member C, and the driving means H and G that open and close the both blade members. An opening F01 coinciding with the photographing optical axis is formed in the base plate F, and this opening F01 has a larger diameter than an exposure opening D01 formed in an intermediate plate D (partition plate) described later. The base plate F is integrally formed with a shutter connection means support shaft F03 on the opposite surface to the pin-shaped stop blade support shaft F02 that rotatably supports the shutter connection means S and the stop blade member C. The base plate F is assembled with the shutter connecting means S and the shutter blade member E, then the intermediate plate (partition plate) D, the diaphragm blade member C thereon, and the presser plate B thereon. Incorporated.

  The shutter blade member E is rotatably supported by a support shaft S03 (second operating pin described later) of the shutter connecting means S and is guided by a guide rib F06 formed on the base plate F so as to cover the opening F01 (closed). Position, hereinafter referred to as “closed position”) and an open position retracted from this opening F01 (open position, hereinafter referred to as “open position”). The shutter blade member E is formed with a slit hole F05 that engages an operating pin H12 of a shutter blade driving means H described later, and the base plate F is provided with a slit hole F05 that passes through the operating pin H12. The shutter blade member E appropriately blocks subject light received from the front lens A and passing through the exposure opening D01 formed in the intermediate plate (partition plate) D and received by the solid-state imaging device J such as a CCD. A shutter for obtaining appropriate exposure together with the member C, comprising a sheet obtained by painting and vapor-depositing a black pigment on a polyester film, a tetron film or the like.

  In the figure, E01 is a rotation center hole through which the support shaft S03 of the shutter connecting means S passes, and is rotatably supported by the support shaft S03. Reference numeral E02 denotes an operation slit hole through which the operation pin H12 of the shutter blade driving means H passes, and the shutter blade E swings around the rotation center hole E01.

  Further, the base plate F is integrally provided with stoppers F08 and F09 made of protrusions for restricting the movement of the shutter blade member E that is supported so as to be freely opened and closed. The shutter blade member E abuts against the stopper F09 at the closed position and is opened. At this position, it abuts against the stopper F08, and further rotation is restricted. Accordingly, the stoppers F08 and F09 serve as regulating members that regulate the movement of the shutter blade member E.

  Thus, the shutter blade member E supported on the base plate F so as to be freely opened and closed is covered with an intermediate plate (partition plate) D. The intermediate plate (partition plate) D is supported by protrusions F10 and F11 formed integrally with the base plate F, and a gap for rotating the shutter blade member E is formed between the base plate F and the intermediate plate (partition plate) D. ing. The shutter blade member E is formed of a resin film, and the intermediate plate (partition plate) D is also formed of a resin film such as the same material. The intermediate plate (partition plate) D has an exposed opening D01 that coincides with the opening F01 of the base plate, and the illustrated one is formed to have a diameter of 4 mm. The exposure opening D01 guides the maximum amount of photographing light to a solid-state imaging device of an imaging device described later when the shutter blade member E is in an open state, but the aperture is 4 mm or less. As a result, even if strong light such as sunlight is sent to an image sensor such as a CCD, there is no fear of burning. This numerical value is a limit value obtained by experiments.

  The intermediate plate (partition plate) D is formed with a hole D02 through which the diaphragm blade support shaft F02 passes. Similarly, a slit D04 through which the operation pin G12 of the diaphragm blade driving means G passes and an operation pin H12 of the shutter blade driving means H. And a slit D05 through which each of the support shafts S03 of the shutter connecting means S penetrates. Incidentally, D06 in the figure is a retreat area when the diaphragm blade C and the shutter blade E are retreated from the exposure opening D01. The shutter blade member E and the diaphragm blade member C have a diaphragm blade support that serves as a rotation center at a position that linearly opposes the posture that enters the exposure opening D01 and the posture that is located in the retreat area D06, respectively. A shaft F02 and a shutter connecting means support shaft F03 are disposed. In addition, D07 in the figure is a positioning concave groove hole and a pin F12 formed on the ground plane F is fitted, and D08 is a positioning hole in which the pin F13 of the ground plane F is fitted.

  Next, the diaphragm blade member C will be described. The amount of light from the subject lens incident from the front lens A of the imaging device described later to the solid-state imaging device J from the exposure opening D01 formed in the intermediate plate (partition plate) D is adjusted. The aperture blade C for this purpose is configured as follows. A diaphragm blade member C formed by punching a resin film is provided with a diaphragm aperture C03 having a smaller diameter than the exposure opening D01 of the intermediate plate (partition plate) D, and engages with a diaphragm blade support shaft F02 formed on the base plate F. A rotation center hole C01 is formed, and a slit C02 that engages with an operating pin G12 of the diaphragm blade driving means G described later is formed. An attachment reference hole C04 for attaching the ND filter described in FIG. 2 is provided in the vicinity of the aperture opening C03.

  Next, the presser plate B will be described. The presser plate B, which is formed of a metal plate and substantially in the same shape as the base plate F, includes the shutter blade member E and the aperture blade member C described above between the base plate F and a unit. It is composed. An opening B01 whose center coincides with the exposure opening D01 is formed in the pressing plate B, and the opening B01 is formed to have a diameter larger than that of the exposure opening D01. B02 is engaged with the diaphragm blade support shaft F02 formed on the base plate F, B04 is a relief hole through which the operating pin G12 of the diaphragm blade driving means G moves, and B05 is connected to the operating pin H12 of the shutter blade driving means H and the shutter. This is a relief hole of the support shaft S03 of the means S. B07 is a stopper hole for the stopper F08, and B08 is a relief hole for the stopper F09.

  In the drawing, B09 and B10 are positioning holes, and pins F12 and F13 formed on the ground plane F are engaged with each other. As a result, the base plate F and the holding plate B are aligned. Similarly, the presser plate B has a plurality of appropriately illustrated bent portions B11 for gap adjustment formed in six places, and a gap between the base plate F, the intermediate plate (partition plate) D, and the presser plate B is formed. Forming. Further, the locking recesses B12 are provided at two locations, and are fitted (fixed) with the base plate F by fitting with claws F14 and F15 formed on the base plate F. In the figure, D08 is a positioning hole which is an escape hole through which the intermediate plate positioning pin F13 of the base plate F passes.

  The diaphragm blade drive means G and the shutter blade drive means H will be described. The diaphragm blade drive means G is an aperture stop position and an exposure opening D01 that appropriately retracts the diaphragm blade member C with respect to the exposure opening D01 of the intermediate plate (partition plate) D. It drives between the narrowing position which approached to. In the figure, G02 is a coil frame, which is composed of two upper and lower bodies, which supports a magnet rotor G01 in a rotatable manner, and has a concave groove around which the conductive coil G03 is wound, and the conductive coil G03 is wound around it. To do. G03 is a conductive coil, which is wound around the coil frame G02, and rotates the magnet rotor G01 as appropriate depending on the supply of drive current and the supply direction. G04 is a yoke which is mounted so as to wrap the outer periphery of the coil frame G02 around the outer periphery of the coil frame G02 with the magnet rotor G01 pivotally supported, and shields the external magnetic field to the magnet rotor G01. It is. The yoke G04 has a C-shaped cross section and a slit-like cutout formed in part. The rotor always receives a rotational force at this notch, with the position where the line connecting the magnetic pole NS of the magnet rotor G01 intersects the notch as a stable point (neutral point).

  Therefore, when the apparatus power supply of the notch portion of the yoke G04 is turned off, a biasing means that always acts on the magnet rotor G01 is configured to hold the aperture blade member C in the retracted position. The F stopper F08 constitutes a holding means for holding the aperture blade member C in the retracted position. As a result, even if the power is turned off, the diaphragm blade member C can always be securely held at the diaphragm retracted position, and the previous one must always perform a confirmation trigger (initialization operation) when the power is turned on. There is no need for it, and it is easy to control. Further, the urging means is a yoke G04 having a C-shaped cross section, and the diaphragm blade driving means G uses the magnet rotor G01 as the driving means, and is composed of a magnetic body that exerts a magnetic action on the magnet rotor G01, thereby providing a locking mechanism. The control can be performed simply by cutting off the drive current and turning off the power source. The urging means can be constituted by an urging spring that always acts on the diaphragm blade driving means G without using a magnetic action, so that the diaphragm blade C can be surely kept at a constant position as compared with the magnetic attraction action. It can be held at the aperture retracted position. G12 is an operating pin of the magnet rotor G01 and is for fitting into the slit hole C02 of the aperture blade member C.

  The shutter blade driving means H, together with the shutter connecting means S, is located between the shutter open position where the shutter blade member E is properly retracted from the exposure opening D01 of the intermediate plate (partition plate) D and the shutter closed position which has entered the exposure opening D01. It is driven by. In the figure, H02 is a coil frame, which is composed of two upper and lower bodies, and a magnet rotor H01 (not shown) is pivotally supported inside and has a concave groove around which the conductive coil H03 is wound. The coil H03 is wound around. H03 is a conductive coil that is wound around the coil frame H02 and appropriately rotates the magnet rotor H01 in accordance with the supply of drive current and its supply direction. H04 is a yoke having a flat portion parallel to the winding direction of the conductive coil H03.

  The yoke H04 has a C-shaped cross section, and obtains the same action from the same configuration as the yoke described above. Therefore, a biasing means is provided which always acts on the magnet rotor H01 so as to hold the shutter blade member E in the retracted position when the apparatus power supply of the yoke notch is turned off. Note that the biasing means can be constituted by a biasing spring that always acts on the shutter blade driving means H without using a magnetic action, and the shutter blade member E can be surely fixed at all times as compared with the magnetic attraction action. It is possible to hold the shutter in the open position. H12 is an operating pin of the magnet rotor H01 described with reference to FIG. 3 (d). The operating pin fits into the operating slit hole E02 of the shutter blade member E, and swings the shutter blade member E around the rotation center hole E01 as appropriate. It is.

  A case where the present invention is employed in the transmission mechanism between the shutter blade member E and the shutter blade driving means H described above will be described. First, the shutter blade member E (hereinafter simply referred to as the shutter blade) is formed in an appropriate shape by punching a thin metal plate or plastic film as described above, and is disposed on the guide rib F06 provided on the ground plate F. The illustrated shutter blade E is composed of a single blade member, but two or more shutter blades may be appropriately combined, and various known shapes and structures may be employed. The one shown in the figure is constituted by a single sheet for use in a small and compact image pickup apparatus such as a digital camera, and the exposure opening F01 is shielded and opened by operating the single blade at high speed. Accordingly, the structure is simpler than when a plurality of blades are simultaneously opened and closed, but the shutter blade E needs to be moved at a high speed.

  On the other hand, a well-known electromagnetic motor may be used as the shutter blade driving means H, but the following configuration is adopted in order to make the apparatus compact and inexpensive. As described above, a rotating shaft is provided at the center of the cylindrical magnet rotor, the rotating shaft is rotatably supported by a hollow coil frame, and the conductive coil H03 is wound around the outer periphery of the coil frame. The magnet rotor is rotated by a magnetic field generated in the coil by making the magnetic pole of the magnet rotor and the winding direction of the coil orthogonal to each other.

  As shown in FIG. 3D, the shutter blade driving means H employs a driving device having the following structure, for example. The shutter blade driving means H is configured such that a magnet rotor H01 is rotatably housed in a coil frame H02, a conductive coil H03 is wound around the outer periphery of the coil frame H02, and an outer casing is covered with a yoke H04. In the magnet rotor H01, a cylindrical permanent magnet magnetized with N-S2 poles is integrated with a rotating shaft H06, and a first transmission member H11 (hereinafter referred to as a first transmission lever) is provided integrally with the rotating shaft H06. . Although not shown, the illustrated coil frame H02 is divided into two parts in the vertical direction in the direction orthogonal to the rotation axis H06, and is formed by molding a synthetic resin. Inside, a housing portion for the magnet rotor H01 and a bearing hole for the rotation axis H06 are formed. . Then, the magnet rotor H01 is housed in the coil frame H02 divided vertically so as to be rotatable about the rotation axis H06. The magnet rotor H01 is provided with a first transmission lever H11 formed integrally with the rotation shaft H06 so that the rotation of the rotor is output to the outside.

  Accordingly, the first transmission lever H11 is composed of an arm-shaped lever member, protrudes from the notch opening formed in the coil frame H02 and the yoke H04 to the outside of the yoke H04, and transmits the swinging motion to the blades. . An operating pin H12 is provided at the tip of the first transmission lever H11.

  Therefore, when a direct current is applied to the conductive coil H03 to generate a magnetic field in the conductive coil, the magnet rotor H01 rotates by a predetermined angle in a predetermined direction, and when a reverse current is applied to the conductive coil H03, the magnet rotor H01 rotates in the reverse direction. To do. The rotation of the magnet rotor H01 causes the first transmission lever H11 to swing by a predetermined angle.

  The rotation of the first transmission lever H11 rotates the shutter blade E as will be described later. In this case, the shutter blade E is reciprocated by applying forward and reverse currents to the conductive coil H03. In some cases, an accumulating means such as a charge spring may be provided, and the first transmission lever H11 may be swung only in one direction by energization of the conductive coil H03, and returned by the accumulating force of the accumulating means. The illustrated one shows a case where a current in the forward and reverse directions is applied to the conductive coil H03.

The above-described shutter blade driving means H is attached to the substrate F in which the shutter blade E is incorporated in the coil frame H02 by being fitted and locked in a fixing hole formed in the substrate F using screws or elasticity.
Therefore, as described above, the shutter blade E is supported on the substrate F by the guide rib F06 formed around the exposure opening F01, and an intermediate plate (partition plate) D (a pressing plate in the case of an apparatus configuration that does not require the diaphragm blade). The shutter blade E is supported between the guide surface of the substrate F and the intermediate plate (partition plate) D (or pressing plate).

The substrate F is provided with a second transmission member S (hereinafter referred to as a second transmission lever) having the following configuration.
The second transmission member S is disposed on the upper surface side in FIG. 3D on the front surface side where the shutter blades E of the substrate F are disposed or on the lower surface side in FIG. The illustrated one is rotatably attached to a boss-like support shaft F03 formed integrally on the back side of the substrate F. The second transmission lever S is supported by the support shaft F03 at a position spaced from the rotation shaft H06 of the magnet rotor H01, which is the rotation center of the first transmission lever H11, and swings about the support shaft F03. Configure. The second transmission lever S is provided with a slit hole S02 that engages with the operation pin H12 of the first transmission lever H11, and a second operation pin S03 is provided on the opposite side via the support shaft F03.

  Accordingly, when the first operating pin H12 is rotated by a predetermined angle by the magnet rotor H01, the second operating pin S03 is rotated by a predetermined angle in the opposite direction. Therefore, the shutter blade E is attached to the first and second operating pins as follows. First, either one of the first operating pin H12 and the second operating pin S03 is rotatably supported by the shutter blade E, and the other operating pin is engaged with a slit hole E02 formed in the shutter blade E. Then, the shutter blade E receives a force in a direction rotating from the other operating pin around the bearing operating pin, and simultaneously transmits a rotating force in the opposite direction from the bearing operating pin.

  In the illustrated example, the first operating pin H12 formed in the first transmission lever H11 and the slit hole E02 formed in the shutter blade E are engaged, and the second operating pin S03 formed in the second transmission lever S and the shutter are engaged. A rotation center hole E01 formed in the blade E is fitted. Therefore, the rotation of the magnet rotor H01 described above is transmitted as the swinging motion of the first transmission lever H11, and the motion is transmitted from the first operating pin H12 to the shutter blade E through the slit hole E02 engaged therewith. The At the same time, the first operating pin H12 causes the second transmission lever S to swing about the support shaft F03 through the slit hole S02.

  The swinging motion of the second transmission lever S is transmitted to the shutter blade E via the second operating pin S03. Accordingly, the movement of the shutter blade E will be described. The movement of the shutter blade E transmitted from the first operating pin H12 through the slit hole E02 and the movement transmitted from the second operating pin S03 through the rotation center hole E01. The opening / closing operation is performed by combining the above.

  Explaining the opening / closing operation of the shutter blade E, FIGS. 3 (a) and 3 (b) show the movement of the shutter blade when the magnet rotor H01 rotates counterclockwise as shown in FIG. The movement of the shutter blade E around the center hole E01 is shown in FIG. 5B, and the movement of the shutter blade E around the support shaft F03 is shown.

  As the magnet rotor H01 rotates by a predetermined angle α, the shutter blade E moves from the two-dot chain line state of FIG. This is because the movement is transmitted so that the first transmission lever H11 swings by the angle α, and the first operating pin H12 swings the shutter blade by the angle α through the slit hole E02. 3A shows the position of the exposure opening, and the predetermined angle α of the magnet rotor H01 shows a state in which the shutter blade E does not completely cover the exposure opening D01. The rotation of the magnet rotor H01 by the predetermined angle α brings about the motion of FIG. 3B at the same time as the motion of the shutter blade E as shown in FIG.

  That is, when the magnet rotor H01 rotates by a predetermined angle α, the first transmission lever H11 moves the first operating pin H12 through the slit hole S02 of the second transmission lever S by a predetermined angle α. Then, the second transmission lever S swings around the support shaft F03, and the second operating pin S03 attached to the second transmission lever S centers on the support shaft F03 around the rotation center hole E01 of the shutter blade E. Move the angle γ. This movement moves the shutter blades (shown by a one-dot chain line in FIG. 3 (b)) in FIG. 3 (a) described above to the solid line state in FIG. 3 (b). In this solid line state in FIG. 3B, the shutter blade E completely covers the exposure opening D01, and the shutter blade E is in the closed posture.

  Therefore, as shown by an angle β in FIGS. 3A and 3B, the shutter blade E is fixed to the substrate F with the rotation center hole E01, the magnet rotor H01 is rotated by an angle β, and the shutter blade E is opened (see FIG. 3). Compared with the movement of moving from the (a) two-dot chain line) to the closed position (solid line in FIG. 3B), the closing speed of the shutter blade E, that is, the shutter speed, is β / α times faster.

  In this way, when rotating the shutter blade E, the rotation of the magnet rotor H01 is directly transmitted to the shutter blade E, and at the same time the rotational center of the shutter blade is simultaneously rotated in the closing direction of the blade, thereby swinging the shutter blade E. It becomes possible to increase the angle (rotation angle). Such an increase in shutter speed will be described with reference to FIG. 3D. (X1) is the center line of the rotation axis H06 of the magnet rotor H01, (X2) is the center line of the first operating pin H12, and (X3) Indicates the center line of the support shaft F03, and (X4) indicates the center line of the second operating pin S03.

Therefore, in order to make the shutter blade E closing (same as opening) speed faster than the rotational speed of the magnet rotor H01, the distance L ₁ between the rotating shaft H06 of the magnet rotor H01 and the first operating pin H12, the first operation. pin H12 and the distance _{L 3} between the support shaft F03, shaft F03 relationship rotary shaft H06 and the support shaft F03 magnet rotor H01 differs positions of the distance _{L 2} between the second actuation pin S03 _{(L 1} ≠ _{L 3)} in is necessary to increase the _{L 2} than _{L 3.} The illustrated ones have a relationship of L ₁ > L ₃ and L ₂ > L _{3. When} L ₃ is increased with respect to L ₂ , the movement of the blade is proportionally increased.

  The engagement relationship between the shutter blade E described above and the first and second transmission levers may be configured as follows. The first operating pin H12 of the first transmission lever H11 and the shutter blade E are replaced by pin-slit coupling, and the first operating pin H12 is supported by a rotation center hole E01 formed in the shutter blade E to perform the second operation. Even if the pin S03 is configured to engage with the slit hole E02 formed in the shutter blade E, the high-speed motion of the shutter blade E similar to that described above can be obtained, although the motion locus of the shutter blade is different.

  Next, the operation state (opening / closing movement) of the shutter blade E and the diaphragm blade member C (hereinafter simply referred to as the diaphragm blade) will be described with reference to FIG. 2A shows an operating state of the diaphragm blade C with respect to the exposure opening D01 of the intermediate plate (partition plate) D as viewed from the holding plate B side in FIG. A state indicated by a two-dot chain line indicates a state in which the diaphragm blade C is in contact with the diaphragm blade stopper F07 of the base plate F and is in the diaphragm retracted position retracted from the exposure opening D01 of the intermediate plate (partition plate) D. Further, the state indicated by the dotted line indicates a state where the diaphragm blade C is in the narrowed position where it comes into contact with the diaphragm blade / shutter blade common stopper F09 of the base plate F and enters the exposure opening D01 of the intermediate plate (partition plate) D. . At this narrowing position, a current in the same direction as the driving current at the time of contact is supplied to the conductive coil G03 of the diaphragm blade driving means G, and the contact state is determined by the driving force of the diaphragm blade driving means G. It is maintained and is more resistant to impacts and the like than holding by magnetic action, and there is no image unevenness by reliably holding the narrowed state.

  FIG. 2B shows an operation state of the shutter blade E with respect to the exposure opening D01 of the intermediate plate (partition plate) D as seen through the intermediate plate (partition plate) D viewed from the holding plate B side in FIG. It is. The state indicated by the two-dot chain line indicates a state in which the shutter blade E is in contact with the shutter blade stopper F08 of the base plate F and is in the shutter open position retracted from the exposure opening D01 of the intermediate plate (partition plate) D.

  Further, the state indicated by the dotted line shows a state in which the shutter blade E is in the shutter closed position where it comes into contact with the diaphragm blade / shutter blade common stopper F09 of the base plate F and enters the exposure opening D01 of the intermediate plate (partition plate) D. Yes. In this shutter closed position, a current in the same direction as the driving current at the time of contact is supplied to the conductive coil H03 of the shutter blade driving means H, and the contact state is caused by the driving force of the shutter blade driving means H. Is more resistant to impacts and the like than holding by magnetic action, and the shutter closed state is securely held, so that there is no exposure mistake.

  Further, as indicated by the dotted line, the shutter blade E rotates while the shutter blade E reaches the shutter closing position, and simultaneously the rotation center hole E01 of the shutter blade E forms the support shaft S03 of the second transmission lever S. Displacement is made counterclockwise by the swing, and the closing operation is performed at high speed according to the amount of displacement. The high-speed closing operation of the shutter blade E will be described with reference to FIG. 3, which is illustrated by dividing the closing operation into two main operations for the sake of explanation. The operation is to operate simultaneously.

  First, the operation (a) in the drawing shows that the shutter blade E is driven by the operating pin H12 (first operating pin) of the shutter blade driving means H from the open position, so that the support shaft S03 (second shaft) of the second transmission lever S is driven. It shows a state in which it has been rotated by a swing angle α around the operating pin). Note that the swing angle β indicates a swing angle for allowing the shutter blades of the conventional light amount adjusting device to reach the closed position.

  In this state of (a) operating position, as shown in (b) operation, the support shaft S03 (second operating pin) of the second transmission lever S is moved to the operating pin H12 (first operating pin) of the shutter blade driving means H. ) Around the swing angle γ, the first operating pin H12 is rotated by the swing angle α and simultaneously displaced counterclockwise, so that the shutter blade E is exposed to the opening of the intermediate plate (partition plate) D as shown in the figure. By closing D01, the state is the same as when the substantial swing angle β is swung.

  That is, the operating pin H12 (first operating pin) of the shutter blade driving means H only needs to be rotated by the swing angle α in order for the shutter blade E to close the exposure opening D01 of the intermediate plate (partition plate) D. The time required to rotate by the angle β is only the time required to rotate by the swing angle α, and a high-speed closing operation can be obtained.

  The light quantity adjusting device described above is incorporated in the lens barrel of the camera device to constitute the imaging device, and is incorporated between the front lens A and the rear lens I constituting the imaging lens as shown in FIG. To be controlled. FIG. 4 is a conceptual block diagram, where E is a shutter blade member, C is an aperture blade member, G is an aperture blade drive means, H is a shutter blade drive means, and J is a solid-state image sensor such as a CCD. .

  The light amount adjusting device is incorporated in a lens barrel of a digital camera, a video camera or the like, and adjusts the light amount such as a shutter that blocks the light amount of the imaging optical path where the light from the subject reaches the solid-state image sensor J or a diaphragm that adjusts the light amount. Do. FIG. 4 shows an outline of the imaging apparatus, A is a front lens of the imaging lens, and I is a rear lens. An imaging lens usually composed of a plurality of lens arrays is incorporated in a lens barrel (not shown) so as to be movable along an imaging optical path (hereinafter referred to as an optical path) for focal position adjustment, and a drive motor is connected to the movable lens. ing. Its structure is well known and will be omitted.

  A focusing motor drive circuit FM is connected to the motor of this focusing mechanism. A solid-state imaging device J is disposed on the imaging surface of the imaging lens. The solid-state imaging device J has a number of photoelectric conversion elements arranged in accordance with the resolution, and electrically converts the formed subject image. For example, a device known as a CCD is composed of a charge layer that generates charge by light and a transfer layer that transfers the charge of the charge layer to the outside, and a CCD control circuit J01 is connected to the transfer layer. This CCD control circuit J01 incorporates a buffer memory for accumulating charges from the transfer layer, an amplifier circuit, and an A / D conversion circuit, and charges each pixel from the transfer layer to the buffer memory in accordance with a signal from a reference clock. Forward to. The light quantity adjusting device described above is unitized and incorporated between the front lens A and the rear lens I. The shutter blade driving means (drive meter) H has a shutter drive circuit SH and the diaphragm blade drive means (drive meter) G has a shutter drive circuit SH. An aperture driving circuit IR is provided. These control circuits are connected to a CPU 100 that controls the entire camera apparatus, and each operation is controlled by the CPU 100. The CPU 100 is connected so that signals from the release switch SW2 and the power switch SW1 are transmitted.

The operation will be described with reference to FIG.
First, when the power switch of the camera is turned on (ST01), the CPU 100 supplies power to each drive component. For example, in a camera equipped with a display screen such as a liquid crystal, the backlight of the liquid crystal is turned on and display is possible, and the solid-state image sensor J also transfers the generated charge to the image processing circuit and sends it to the display screen. At this time, the shutter blade member E and the diaphragm blade member C of the light quantity adjusting device are not supplied with power to the conductive coils H03 and G03 of the driving means H and G. (The same state as when the power switch SW1 is OFF). In this state, the shutter blade member E is in the open position, the aperture blade member C is in the retracted position, and the amount of light from the subject is imaged on the solid-state image sensor J and displayed on the display screen.

  Simultaneously with this apparatus power operation (ST01), the copy body image is displayed on the display screen and the monitor (ST02) is executed. Next, the user operates the mode selection switch to shoot in the state displayed on the monitor (moving image shooting mode) or to shoot in the still image state (still shooting mode) (ST03). When the still shooting mode (called single frame shooting mode) is selected, the user confirms the subject on the monitor display or from the viewfinder and executes the release operation. If the power switch SW01 is turned off without performing the release operation, all the operations are finished, the power supply is cut off, and the photographing is finished (ST04). In the release operation, the shutter button is first pressed halfway (ST05). In response to this signal, the CPU 100 drives the motor FM to execute a focusing operation to adjust the focus. At the same time, the CPU 100 calculates an appropriate exposure amount from the received light amount of the CCD and determines whether or not to use the aperture blade. The shutter button is fully pressed (ST06)

  Then, when using the diaphragm blades (small diaphragm photographing), the CPU 100 issues an instruction signal for supplying power to the conductive coil G03 to the diaphragm drive circuit IR. In response to this signal, the diaphragm drive circuit IR supplies a predetermined current to the conductive coil G03, and the rotor rotates by the magnetic field generated in the conductive coil G03. With this rotation of the rotor, the operating pin G12 rotates the diaphragm blade member C in the clockwise direction in FIG. 3, moves from the two-dot chain line state to the one-dot chain line position, hits the stopper (diaphragm blade regulating means) F09, Is supplied in this state (ST07).

  After the expected time for the operation of the diaphragm blade C, the CPU 100 issues a reset signal to the CCD control circuit J01. With this reset signal, the CCD control circuit J01 invalidates and resets the image data stored in the buffer memory (ST08). Exposure is started upon completion of the reset, and light from the subject is photoelectrically converted by the charge layer of the CCD.

  When a predetermined time (exposure time) obtained by calculation elapses, the CPU 100 issues a shutter closing instruction signal to the shutter driving circuit SH. The shutter drive circuit SH obtains this signal and supplies a predetermined current to the conductive coil H03 of the shutter drive means (drive meter) H. The current generated in the conductive coil H03 by the supply of the current rotates the rotor counterclockwise in FIG. 3B, and moves the shutter blade member E from the open position indicated by the two-dot chain line to the closed position indicated by the dotted line. With this movement of the blades, the light from the subject is completely closed, and the exposure of the CCD is completed (ST09).

  The shutter drive circuit SH continues to pass a predetermined current through the conductive coil H03 even after the blades are moved to the closed position, and the generated magnetic field of the conductive coil H03 applies a force for rotating the rotor counterclockwise. Therefore, the shutter blade member E keeps a stationary state by striking against the stopper (shutter blade regulating means) F09 (ST10).

At this time, even if an external force such as an impact is applied from the outside, the blade is held in the closed position.
Next, the CPU 100 issues an exposure end signal to the CCD control circuit J01, and transfers the charge charged in the charge layer of the CCD to the image processing circuit via the transfer layer. This transfer of data is performed in accordance with the scanning signal in the X and Y directions sequentially for the charge of each pixel of the CCD, and the control is performed based on the reference clock of the CCD control circuit J01. Therefore, the data transfer time is determined by the characteristics of the CCD and the control circuit.

  Therefore, the CPU 100 supplies a predetermined current to the conductive coil H03 for a preset time (at least longer than the data transfer time) based on the data transfer time. Then, the shutter blade member E is held in the dotted line state (closed position) in FIG. 3D, and external light does not reach the CCD during the data transfer process (ST11).

  Next, when a predetermined set time elapses, the CPU 100 issues an operation end signal to the aperture driving circuit IR and the shutter driving circuit SH. With this signal, the diaphragm drive circuit IR supplies a reverse current to the conductive coil, and moves the diaphragm blade member C from the dotted line (operating position) in FIG. 3A to the two-dot chain line (retracted position) (ST12). After this operation, the supply of current is cut off. Then, the shutter blade member E is attracted to the cut (slit) portion formed on the yoke by the rotor of the driving means by the magnetic force of the permanent magnet and abuts against the stopper F08 to be stationary (ST13).

  Similarly, the shutter drive circuit SH supplies a current in the reverse direction to the conductive coil H03, and moves the shutter blade member E from the dotted line closed position in FIG. 3B to the open position of the two-dot chain line (ST14). When the energization to the conductive coil H03 is interrupted in this state, the rotor of the shutter blade driving means H is attracted by the slit portion formed in the yoke H04, and the shutter blade member E is held in the open position in a state of abutting against the stopper F07. With this operation, the light amount adjusting device is in an initial state and is ready for the next photographing operation.

  In the above description, the shutter connecting means S (second transmission lever) is pivotally supported on the base plate F between the base plate F and the shutter blade driving means H, but the shutter blade member E and the base plate F If a sufficient space can be secured, the shutter connecting means S (second transmission lever) can be interposed between the shutter blade member E and the ground plane F.

  Further, the shutter connecting means S (second transmission lever) and the shutter blade member E are simultaneously swung by the operating pin H12 of the shutter blade driving means H, but the operation when the shutter blade driving means H is activated. In order to reduce the load, by appropriately changing the slit shape of the slit S02 of the shutter connecting means S (second transmission lever), only the shutter blade member E is swung when the shutter blade driving means H is started, and the shutter is somewhat closed. The same operation can be obtained by swinging the shutter connecting means S (second transmission lever) when the rotation of the blade driving means H is accelerated, and a smooth operation can be obtained.

The assembly exploded perspective view showing one form of the light quantity adjustment device which carried out the present invention. The operation state of the blade | wing member of the light quantity adjustment apparatus of FIG. 1 is shown, (a) is an operation | movement state of an aperture blade, (b) is explanatory drawing of the operation state of a shutter blade | wing. 1A and 1B show the shutter blade opening and closing structure in the light quantity adjusting device of FIG. 1, wherein FIGS. 1A and 1B are explanatory diagrams of an operation state in which the shutter is moved from an open state to a closed state, and FIGS. The connection structure with a drive device is shown, (c) is a plan view (d) is a longitudinal sectional view. The block diagram which shows the structure and control of an imaging device incorporating the light quantity adjustment apparatus of FIG. Explanatory drawing of the operation | movement flow at the time of the one frame imaging | photography in the imaging device of FIG. Schematic explanatory drawing which shows the light quantity adjustment apparatus of an example of a prior art. Schematic explanatory drawing which shows the light quantity adjustment apparatus different from FIG. 6 of a prior art.

Explanation of symbols

A Front lens B Holding plate C Aperture blade member D Intermediate plate (partition plate)
D01 Exposure opening E Shutter blade member F Ground plane (device board)
F02 Diaphragm support shaft F03 Shutter coupling means support shaft G Diaphragm drive means G01 Magnet rotor G02 Coil frame G03 Conductive coil G04 Yoke G12 Actuating pin H Shutter blade drive means H01 Magnet rotor H02 Coil frame H03 Conductive coil H04 Yoke H11 First transmission Lever H11
H12 actuating pin (first actuating pin)
I Rear lens J Solid-state imaging device S such as CCD S Shutter coupling means (second transmission lever)
S03 Support shaft (second operating pin)
100 CPU

Claims (5)

A substrate having an exposure aperture;
A light amount adjusting blade disposed on the substrate and restricting the opening and closing of the exposure opening;
A rotor having a rotation axis;
An exciting coil for driving and rotating the rotor;
Transmission means for transmitting the rotation of the rotor to the light quantity adjusting blade;
With
The transmission means is
A first transmission member connected to the rotation shaft of the rotor and swinging about the rotation shaft;
A second transmission member connected to the first transmission member and swinging about a support shaft different from the rotation shaft;
Consisting of
A first operating pin is formed on the first transmission member, and a second operating pin is formed on the second transmission member.
The first operating pin is engaged with and connected to a slit hole formed in the second transmission member,
The support shaft of the second transmission member is provided on the substrate between the second operating pin and the slit hole,
The light amount adjustment blade, first of the first of the first operating pin and the other transmission member while being rotatably supported on one of the second operation pin of the second transmission member of the transmission member The light quantity adjusting device is connected to one operating pin or the second operating pin by pin-slit coupling. The pin - slit bond claims, characterized in that it is constituted by fitting the slits hole provided the first of the first actuating pin provided on the transmission member and the light amount adjusting blades together Item 4. The light amount adjusting device according to Item 1. The first transmission member is configured integrally with the rotor, and includes a first operating pin that can swing around a rotation axis of the rotor,
3. The light quantity adjusting device according to claim 1, wherein the second transmission member is rotatably supported by the substrate and includes a slit hole that engages with the first operating pin. A substrate having an exposure aperture;
A blade member disposed on the substrate and restricting the opening and closing of the exposure opening;
A rotor having a rotation axis;
An exciting coil for driving and rotating the rotor;
Transmission means for transmitting the rotation of the rotor to the light quantity adjustment blade,
The transmission means is
It is composed of first and second transmission members having different rotational axes at a distance from each other,
The first transmission member has a first operating pin that swings around the rotation axis of the rotor,
The second transmission member is
A slit hole engaged with the first operating pin;
A second operating pin that swings about a rotation axis different from the rotation axis of the rotor,
The blade member has a slit hole that engages with the first operating pin, and is rotatably supported by the second operating pin.
The light amount adjusting device , wherein the rotation shaft of the second transmission member is disposed between the second operating pin formed in the second transmission member and the slit hole . A photographic lens for imaging photographic light on an imaging means;
A substrate disposed in the optical path leading to the imaging means and having an exposure aperture;
A light amount adjusting blade disposed on the substrate and restricting the opening and closing of the exposure opening;
A rotor having a rotation axis;
An exciting coil for driving and rotating the rotor;
Transmission means for transmitting the rotation of the rotor to the light quantity adjustment blade,
The transmission means is
It is composed of first and second transmission members having different rotational axes at a distance from each other,
The first transmission member has a first operating pin that swings around the rotation axis of the rotor,
The second transmission member includes a slit hole that engages with the first operating pin;
A second operating pin that swings about a rotation axis different from the rotation axis of the rotor,
The blade member has a slit hole that engages with the first operating pin, and is pivotally supported by the second operating pin.
An image pickup apparatus , wherein the rotation shaft of the second transmission member is disposed between the second operating pin formed in the second transmission member and the slit hole .

Images