JP2007192860A - Optical path opening/shutting device and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical path opening/shutting device capable of achieving the smooth opening/shutting operation of a blade member by preventing the interference of superposed blade members with each other, and an imaging apparatus equipped with such an optical path opening/shutting device. <P>SOLUTION: The optical path opening/shutting device 1 is equipped with a film-like combined blade 10 for opening/shutting the aperture of an optical path with its turning, and a pair of bottom boards A30 and B50 for holding the combined blade 10 in between. A pair of blades (X blade and Y blade) not superposed at an open limit but superposed in the middle of closing operation exists in the combined blade. A long projected line 37 supporting the surface of the Y blade for making the X blade enter the lower surface of the Y blade in such a state that the Y blade is made to float relatively to the X blade is formed on the bottom board A30. Since the blade member 11 is supported to be lifted over a wide range by the long projected line 37, a situation that the end of the X blade collides with the end of the Y blade and the blades interfere with each other is avoided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical path opening / closing device that opens and closes an optical path opening such as an aperture and a shutter of an optical apparatus, and an imaging apparatus including the same. In particular, the present invention relates to an optical path opening / closing device and the like that can realize a smooth opening / closing operation of the blade member by preventing interference between the blade members in an optical path opening / closing device having a plurality of blade members.

  An imaging device such as a video camera or a still camera is provided with a lens moving mechanism for moving various lenses for focus control and zooming in the optical axis direction, and an optical path opening / closing mechanism (device) for adjusting the amount of light. There is a type of optical path opening / closing device in which a plurality of blade members are combined to open and close an optical path opening as each blade member rotates.

FIG. 9 is a front view for explaining an example of the movement of a pair of opposed blade members of the optical path opening / closing device, where FIG. 9 (A) is when the optical path is open and FIG. 9 (B) is during the opening / closing operation. FIG. 9C shows when the optical path opening is closed.
FIG. 10 is a front view for explaining an example of the movement of two pairs of opposed blade members of the optical path opening / closing device. FIG. 10 (A) is in the middle of the opening / closing operation, and FIG. 10 (B) is FIG. It is a figure which shows only the blade member of ().
This optical path opening and closing device 101 opens and closes an optical path as it rotates, and a plurality (six in this example, in the figure, a pair (two) or two pairs (four)) of blade members facing each other with an optical axis in between. (Only shown) is composed mainly of a combination blade composed of blade members 111, a windmill 120 that rotates about the optical axis OA, and a base plate 130 that holds the combination blade.

  Each blade member 111 is supported on a sliding surface 133 of the main plate 130 and is supported rotatably on a fulcrum pin 121 implanted in the windmill 120. Each blade member 111 is formed with a cam groove 117. The cam groove 117 engages with a cam pin 135 implanted in the main plate 130, and the cam pin 135 slides in the cam groove 117. A rack 127 is cut at a part of the outer periphery of the windmill 120. The rack 127 meshes with the pinion 163, and the pinion 163 is rotationally driven by a motor via a reduction gear.

  When the pinion 163 is rotated by the motor, the windmill 120 in which the rack 127 that meshes with the pinion 163 is rotated around the optical axis OA. Then, the blade member 111 rotatably supported by each fulcrum pin 121 of the windmill 120 also turns. At this time, the edge of the cam groove 117 of the blade member 111 is pushed by the cam pin 135 planted in the base plate 130, and the cam groove 117 advances along the cam pin 135. Then, the blade member 111 starts to rotate around the fulcrum pin 121 and enters the optical path opening 131 of the main plate 130. A diaphragm opening that can be freely opened and closed is formed by the edge of each blade member 111.

  In such an optical path opening and closing device, all the blade members 111 are placed on the horizontal sliding surface 133 of the main plate 130, and in general, one blade member is the other blade member in front of the rotation direction. They are stacked on top of each other so that they run on top. Then, the opening operation and the closing operation are performed while maintaining this state.

  The blade member 111 is usually a thin and light member in the form of a film and has a low rigidity and is easily bent and twisted in various directions. In addition, since they are not held tightly from above and below in the overlapping direction, the positional relationship between the leading ends of the blade members 111 in the rotational direction due to the posture of the optical path switching device 101 or the impact applied to the device, etc. May be disturbed. Depending on the disturbance in the positional relationship, when the pair of blade members 111X and 111Y facing the optical axis shown in FIG. 9 is considered, during the closing operation, as shown in FIG. The tip end portion of the blade member 111Y in the rotational direction that should ride on the front blade member may enter the lower surface of the other blade member 111X. Then, as shown in FIG. 9C, the edge of one blade member 111X may collide with the edge of the other blade member 111Y, resulting in malfunction.

Further, as shown in FIG. 10, the tip of the blade member 111X ′ may warp upward and ride on the upper surface of the blade member 111Y ′ that should be submerged. Furthermore, the tip of one blade member enters various gaps between the blade members, preventing the rotation of each blade member or preventing each blade member from moving uniformly.
As a result, the opening is not stably formed by the opening forming edge of each blade member.

  In view of this, an optical path opening / closing device that has been improved so that the diaphragm blades do not contact each other has been proposed (see, for example, Patent Document 1). In this optical path opening and closing device, a convex portion is formed on the diaphragm frame, and one diaphragm blade of a pair of overlapping diaphragm blades is mounted on and supported on the convex portion, and the other diaphragm blade is guided around the peripheral surface of the convex portion. As described above. For this reason, the diaphragm blades do not come into contact with each other, and the opening / closing operation of the diaphragm blades can be made smooth.

  However, in this optical path opening / closing device, each diaphragm blade is supported by a dot-like convex portion, so that depending on the posture of the device, the diaphragm blade is inclined and inclined, and the diaphragm blades are not positioned parallel to each other. There is also a possibility. Then, there may be a case where the aperture blades interfere with each other to prevent the opening / closing operation.

Japanese Patent No. 3671491

  The present invention has been made in view of the above problems, and an optical path opening and closing device capable of preventing interference between overlapping blade members and realizing a smooth opening and closing operation of the blade members, and such an optical path opening and closing device. An object of the present invention is to provide an imaging apparatus including the above.

  The optical path opening / closing apparatus of the present invention is an optical path opening / closing apparatus having a fulcrum and a cam groove, and a film-like combination blade that opens and closes the optical path opening as it rotates, and a pair of ground plates that sandwich the combination blade. In the combination blade, there is a pair of blades (X blade, Y blade) that do not overlap at the opening limit but overlap during the closing operation, and the Y blade is floated relative to the X blade. And long ridges for supporting the Y blade surface are formed on the base plate so that the X blade enters the lower surface of the Y blade.

  According to the present invention, since the blades are supported so as to be lifted over a wide range with long ridges, the blades can be floated without tilting or twisting even if the blades are made of a resin film that is light and flexible. be able to. In other words, the Y blade can be supported by floating substantially parallel to the ground plane, and the X blade can be slid between the lower surface of the Y blade and the ground plane. It is possible to avoid a situation in which the blades collide with each other by hitting the blade ends. For this reason, each blade can be smoothly opened and closed, and a smooth opening and closing operation can be obtained. Moreover, since the blade | wing made from a resin film can be used, it leads to the cost reduction of an apparatus.

  In this invention, it is preferable that the some blade | wing in the said combination blade | wing is piled up from the top in the rotation direction of this blade | wing, and is supported on the said protruding item | line.

  According to the present invention, a plurality of blades are stacked from top to bottom in the rotation direction, and some blades are placed on the ridges from above, and the remaining blades are not on the ridges. Can be arranged. In this way, the blades that are not on the ridges can easily enter the lower surface of the blades on the ridges, and at the same time, in the pair of blades that overlap during the closing operation, the blades that are not on the ridges It enters the lower surface of the blade on the strip. Thus, since each blade | wing can be arrange | positioned so that the rotation surface of each blade | wing does not cross | intersect in a side surface, it can operate | move smoothly, without overlapping each blade | wing and colliding.

In this invention, it is preferable that the said protruding item | line is formed in each of a pair of said ground plane.
In this case, it is more preferable that the ridges formed on the pair of ground planes are formed symmetrically with respect to the optical axis.

  According to the present invention, some blades of the combined blades are moved up (one side), and some of the other blades are moved down (the other). Therefore, even when the top and bottom of the optical path opening / closing device is reversed, each blade can be opened / closed so as not to interfere as described above.

  The imaging device of the present invention is an imaging device provided with an optical path opening / closing mechanism that opens and closes an optical path opening, the optical path opening / closing mechanism having a fulcrum and a cam groove, and a film that opens and closes the optical path opening along with its rotation. An optical path opening / closing apparatus comprising a pair of ground blades and a pair of base plates sandwiching the combination blades, wherein the pair of blades does not overlap in the open limit but overlaps during the closing operation (X blade, Long ridges that support the surface of the Y blade are provided on the base plate to float the Y blade relative to the X blade so that the X blade enters the lower surface of the Y blade. It is formed.

  ADVANTAGE OF THE INVENTION According to this invention, the imaging device provided with the optical path opening / closing apparatus which can prevent interference | interference of the overlapping blade member and can implement | achieve the smooth opening / closing operation | movement of a blade member can be provided.

  As is apparent from the above description, according to the present invention, in the pair of blade members that overlap during the closing operation of the plurality of blade members constituting the combination blade, one blade member enters the lower surface of the other blade member. For this reason, since the long ridges for supporting the Y blade surface are provided on the base plate, the blade member can be held without being tilted or twisted. Therefore, it is possible to provide an optical path opening / closing device that can prevent interference between the blade members during the closing operation and realize a smooth opening / closing operation of the blade members, and an imaging device including such an optical path opening / closing device.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, an optical path switching device according to an embodiment of the present invention will be described.
FIG. 1 is an exploded perspective view showing an optical path switching apparatus according to an embodiment of the present invention.
2 is a front view for explaining the movement of all the blade members of the optical path opening and closing device of FIG. 1, FIG. 2 (A) shows a fully open state, and FIG. 2 (B) shows a fully closed state.
3A and 3B are diagrams showing the shape of the windmill, FIG. 3A is a front view, FIG. 3B is a cross-sectional view taken along the line CC in FIG. 3A, and FIG. .
4A and 4B are diagrams showing the shape of the ground plane A. FIG. 4A is a front view, FIG. 4B is a cross-sectional view taken along the line A-A in FIG. 4A, and FIG. is there.
5A and 5B are diagrams illustrating the shape of the ground plane B, where FIG. 5A is a front view, FIG. 5B is a cross-sectional view taken along the line BB in FIG. 5A, and FIG. is there.
FIG. 6 is a partial side cross-sectional view of the optical path switching device of FIG.

  As shown in FIG. 1, the optical path opening and closing device 1 includes a combination blade 10 that opens and closes an optical path, a windmill 20 that rotates about an optical axis OA, and optical path openings 31 and 51 so as to sandwich the combination blade 10. And a pair of ground planes (a ground plane A30 (also referred to as a base) and a ground plane B50).

  In this example, the combination blade 10 includes six blade members 11 having the same shape. Each blade member 11 is a thin member having a substantially semicircular shape. In this example, the blade member 11 is made of a resin film (in one example, a polyester film) coated with a light shielding ability. An arcuate diaphragm forming edge 13 is formed on the inner peripheral portion of the blade member 11. The aperture forming edge 13 of each blade member 11 forms an optical path opening centered on the optical axis OA. Further, a fulcrum hole 15 is formed at the end of each blade member 11, and a cam groove 17 is formed near the center.

The windmill 20 is a ring-shaped member as shown in FIG. 3, and is provided with an extending portion 25 that projects outward from a part of the outer periphery. In this example, six fulcrum pins 21 are planted on the upper surface of the windmill 20 along the outer periphery at an equal central angle (60 ° in this example). Each fulcrum pin 21 is fitted in a fulcrum hole 15 of each blade member 11, and each blade member 11 can rotate around each fulcrum pin 21.
A substantially C-shaped rib 23 is formed around each fulcrum pin 21. Such ribs 23 can reduce the frictional resistance between the windmill 20 and the blade member 11 when the blade member 11 is rotated, and can smoothly rotate the blade member 11.

  A rack 27 is cut at the outer edge of the extending portion 25. The rack 27 meshes with a pinion 63, and the pinion 63 is rotationally driven by a motor 60 via a reduction gear (see FIG. 1). A light shielding plate 29 protrudes from the extending portion 25. The light shielding plate 29 is for position detection using a position detector such as a photo interrupter.

  As shown in FIG. 4, an optical path opening 31 is formed in the ground plane A30. As shown in FIG. 6A, a flat sliding surface 33 on which each blade member 11 is placed and slides is formed around the optical path opening 31. In the outer peripheral area of the sliding surface 33, cam pins 35 that engage with the cam grooves 17 of the blade members 11 are planted at equal central angles (60 ° in this example) along the outer periphery. The periphery of each cam pin 35 is a step part slightly lower than the sliding surface 33. This step portion is formed to avoid the smooth movement of the blade member when there is roughness around the pin.

  Furthermore, a long arc-shaped ridge 37 centered on the optical axis is formed on the sliding surface 33 of the ground plane A30. As an example, the central angle of the ridges 37 is about 100 °, and the length of the ridges 37 is such that three adjacent blade members 11 can ride. The operation of the ridge 37 will be described later.

  A recess 39 in which the wind turbine 20 is placed is formed outside the sliding surface 33. A groove 41 through which the above-described light shielding plate 29 passes is formed in a portion of the concave portion 39 corresponding to the rotation range of the windmill extending portion 25. Further, stoppers 43 and 45 with which the extending portion 25 of the windmill 20 abuts when fully opened and fully closed are formed at both ends of the windmill extending portion rotation range in the recess 37.

  As shown in FIG. 5, the ground plane B50 has substantially the same shape as the ground plane A30, and an optical path opening 51 is formed. As shown in FIG. 5C, a long circular arc-shaped ridge 53 centered on the optical axis is formed around the optical path opening 51 on the surface (back surface) of the base plate B50 on the base plate A30 side. As an example, the central angle of the ridge 53 is about 100 °, and the length of the ridge 53 is substantially the same as that of the ridge 37 formed on the ground plane A30, and the three adjacent blade members 11 ride on it. The length can be. The ridges 53 of the ground plane B50 and the ridges 37 of the ground plane A30 are arranged symmetrically with respect to the optical axis. The operation of the ridge 53 will be described later.

  Further, as shown in FIG. 5 (C), on the rear surface of the ground plane B, when the ground plane B50 is overlapped with the ground plane A30, a hole 55 into which the cam pin 35 implanted in the ground plane A30 enters, and the windmill 20 A groove 57 is formed in which the provided fulcrum pin 21 enters and moves as the windmill 20 rotates.

  After the windmill 20 and the combination blades 10 are incorporated into the ground plane A30, the ground plane B50 is placed on the ground plane A30 to limit the distance in the overlapping direction of the blade members 11 and from the ground plane A of the blade member 11 and the windmill 20 Prevents falling off.

Next, the arrangement of the blade members in the optical path opening / closing device will be described with reference to FIGS.
At the time of full aperture opening shown in FIG. 2A, the aperture forming edges 13 of all the blade members 11 are positioned slightly outside the optical path aperture 31 of the ground plane A30, and the optical path aperture 31 is fully open.
Here, in each blade member 11, from the first blade member 11-1 to the third blade member 11-3 in the turning direction of the blade member (counterclockwise direction in the figure), the sliding of the main plate 30 is performed. It rides on a ridge 37 formed on the moving surface. Thereby, as shown in FIG. 6, the blade member 11 </ b> Y riding on the ridge 37 is floated and held with respect to the sliding surface 33. For this reason, the blade member 11 </ b> X placed on the sliding surface 33 easily enters between the blade member 11 </ b> Y and the sliding surface 33.

  And as shown to FIG. 2 (A), each blade member 11 is arrange | positioned so that it may overlap in order from the 1st blade member 11-1 to the upper surface of the adjacent blade member ahead of a turning direction. That is, the first blade member 11-1 overlaps the upper surface of the blade member (second blade member) 11-2 in the front in the turning direction, and the second blade member 11-2 is in front of the turning direction. The blade member (third blade member) 11-3 overlaps the upper surface of the blade member. However, the sixth blade member 11-6 overlaps the lower surface of the first blade member 11-1. That is, when viewed from the side, the first blade member 11-1 to the sixth blade member 11-6 overlap in order from the top. Here, the term “upper surface” refers to the side viewing FIG. 2 (A) and FIG. 2 (B) as “upper”, and is not related to the actual vertical direction of gravity.

Next, the opening / closing operation will be described with reference to FIG. 2, FIG. 7, and FIG.
FIG. 7 is a front view for explaining the movement of a pair of (two) blade members facing each other in the optical path opening / closing device. FIG. 7 (A) is when the optical path is opened, and FIG. 7 (C) is the optical path opening / closing. During operation, FIG. 7C shows the optical path opening closed.
FIGS. 8A and 8B are front views for explaining the movement of the two pairs (four) of blade members facing each other in the optical path opening / closing device. FIG. 8A is when the optical path is opened, and FIG. During operation, FIG. 8C shows only the blade member of FIG. 8B.

  As shown in FIG. 2A, when fully opened, the extending portion 25 of the wind turbine 20 abuts against the stopper 45 on the right side of the drawing, and the pinion 63 is engaged with the left end of the rack 27. As indicated by arrows in FIG. 2A, when the motor rotates and the pinion 63 rotates clockwise, the rack 27 moves to the left in the figure, and the windmill 20 rotates counterclockwise around the optical axis. Begin to.

  As the windmill 20 rotates, the blade member 11 that is rotatably supported by each fulcrum pin 21 also turns counterclockwise. At this time, the edge of the cam groove 17 located downstream in the blade member turning direction (counterclockwise direction) is pushed by the cam pin 35 planted in the ground plane A30, and the cam groove 17 advances along the cam pin 35. Then, the blade member 11 starts to rotate counterclockwise in the figure with the fulcrum pin 21 as the center. When the blade member 11 further turns, the cam pin 35 moves in the cam groove 17 relatively to the right in the drawing, and the edge of the cam groove 17 of the blade member 11 is continuously pushed by the cam pin 35 while the blade member 11 11 continues to rotate counterclockwise in the figure. Accordingly, each blade member 11 enters from the aperture forming edge 13 so as to block the inside of the optical path opening 31 of the ground plane A30.

  Here, with reference to FIG. 7, a pair of blade | wing member 11-3 and 11-6 which oppose on both sides of an optical axis is demonstrated. In this example, one blade member 11-3 rides on a ridge 37 formed on the sliding surface 33 of the main plate 30 and is supported by floating from the sliding surface 33, and the other blade member 11-6 is supported by It is supported on the sliding surface 33. At this time, since the blade member 11-3 is on the long arc-shaped protrusion 37, the blade member 11-3 floats substantially parallel to the sliding surface 33 without being inclined or twisted so much. When the windmill 20 rotates and the blade member 11 starts to rotate in the closing direction, the blade member 11-6 has a clearance between the blade member 11-3 and the sliding surface 33 as shown in FIG. (Under the blade member 11-3).

  Also in the case of two pairs of opposed blade members 11-2 and 11-5 and 11-3 and 11-6 shown in FIG. 8, one blade member 11-2 and 11-3 of each pair is convex. 37, and the other blade members 11-5 and 11-6 are on the sliding surface 33. Furthermore, each blade member is disposed so as to overlap the upper surface of the blade member forward in the turning direction. When the windmill 20 rotates and the blade member 11 starts to rotate in the closing direction, as shown in FIG. 8B and FIG. 8C, the blade member 11-6 has a sliding surface with the blade member 11-3. The blade member 11-5 enters the gap between the blade member 11-2 and the sliding surface 33. Also at this time, since one blade member 11-2, 11-3 riding on the ridge 37 is located above the other blade member 11-5, 11-6, the blade member 11-5, 11-6 enters the lower surface of the blade members 11-2 and 11-3. Therefore, the blade member to enter does not run on the upper surface of the other blade member, and the positional relationship in the vertical direction of each blade member is maintained.

  In this example, the windmill 20 rotates about 25 °, and as shown in FIG. 2B, the extended portion 25 contacts the left stopper 43 and the right end of the rack 27 reaches the pinion 63. When the wing member 11 comes, the blade member 11 moves from the optical path opening open position to the closing position, and the opening 31 is closed. At this time, in each blade member 11, the blade member 11-1 overlaps the blade member 11-6 from top to bottom.

  During the closing operation, as shown in FIGS. 7B and 7C, the blade member 11-3 is supported by the ridges 37 at about half of its width, and always slides from the open limit to the closed limit. Since it floats substantially parallel to the surface 33, the blade member 11-6 surely and smoothly sinks into the lower surface of the blade member 11-3. In addition, even if the blade member 11-6 rotates to the closed position, it does not contact the ridge 37.

  As described above, each blade member 11 closes so that the rotation surfaces do not intersect at the side surfaces. For this reason, the blade members are closed without interfering with each other, and the malfunction is not caused such that the tip of the blade member enters the lower surface of the opposed blade member.

  In addition, when opening an optical path, the motor 60 is reversely rotated and the windmill 20 is rotated clockwise in the figure.

  On the other hand, when the ground plane B50 of the optical path switching device 1 is directed downward in the gravity direction, the posture of each blade member 11 is reversed. However, the base plate B is also formed with ridges 53 that perform the same function as the ridges 37 of the base plate A30. And since this protruding item | line 53 is arrange | positioned symmetrically with respect to the protruding item | line 37 of ground plate A30, and an optical axis, in this case, in FIG. 2 (A), blade member 11-6 to 11-4, It rides on the ridges 53 (see FIG. 5) of the base plate B. As in the above description, each blade member 11 is supported, and the opening / closing operation can be performed smoothly.

Next, an imaging apparatus according to an embodiment of the present invention will be described.
FIG. 11 is a diagram for explaining the basic configuration of the imaging apparatus.
FIG. 12 is a cross-sectional view showing the configuration of the imaging apparatus according to the embodiment of the present invention.
In this example, a video camera will be described. However, the present invention is not limited to a video camera, and can be applied to various imaging devices having a function of moving image shooting or still image shooting in addition to a still camera.

First, the basic configuration of the imaging apparatus will be described with reference to FIG.
The imaging apparatus 300 includes a lens barrel 301 provided as an outer casing. The lens barrel 301 includes a lens or a lens group (shown as a single lens in the drawing for simplification), an imaging means 320 such as a solid-state imaging device, and an optical path that also functions as an iris or a shutter, or both. An opening / closing device 1 is provided.
Light that has passed through the lens or lens group 310 from the subject O enters the imaging unit 320 through the aperture AP formed by the blade member 10 of the optical path opening / closing device 1.

A specific configuration example will be described with reference to FIG.
The lens barrel 301 is made of a resin such as polycarbonate containing glass. In the lens barrel 301, an objective lens 311, a variable power lens 312, a lens 313, an optical path opening / closing device 1, a focus lens 314, and a solid-state image sensor 320 are arranged in this order from the subject side (left side in the figure). As the optical path opening / closing device 1, the one described in FIG. 1 or the like can be used.

  The variable magnification lens 312 is held by a holder 316, and the holder 316 is slidably supported by two guide bars 303 parallel to the optical axis direction. The holder 303 is driven by the drive unit 304, and the variable power lens 312 held by the holder 316 moves in the optical axis direction.

  The focus lens 314 is held by a holder 317, and the holder 317 is slidably supported by two guide bars 307 parallel to the optical axis direction. The holder 317 is driven by the driving unit 308, and the focus lens 314 held by the holder 317 moves in the optical axis direction.

  The image output obtained by the solid-state imaging device 320 is sent to the image processing unit 321 to perform predetermined processing. The image processing unit 321 sends information necessary for control or the like to the arithmetic processing unit 323, sends a photographed image to a viewfinder, a monitor, or the like, or displays image information or the like on a recording medium according to a user's operation instruction. Let me record. Note that the arithmetic processing unit 323 using a microcomputer or the like sends a control command to the control unit 325, and the control unit 325 transmits the motor 60 (see FIG. 1) of the optical path switching device 1, the variable power lens and focus lens driving unit 304, Each part is controlled by sending a control signal to 308 or the like.

It is a disassembled perspective view which shows the optical path switching apparatus which concerns on embodiment of this invention. It is a front view for demonstrating the motion of all the blade members of the optical path opening and closing apparatus of FIG. 1, FIG. 2 (A) shows the time of full open, and FIG. 2 (B) shows the time of full close. It is a front view for demonstrating the motion of the one blade | wing member of the optical path opening / closing apparatus of FIG. 1, FIG. 3 (A) shows the time of full open, and FIG. 3 (B) shows the time of full close. It is a top view which shows the shape of each blade | wing member. It is a figure which shows the shape of a windmill, FIG. 5 (A) is a front view, FIG.5 (B) is side surface sectional drawing. It is a figure which shows the shape of the ground plane A, FIG. 6 (A) is a front view, FIG.6 (B) is side sectional drawing. It is a figure which shows the shape of the baseplate B, FIG. 7 (A) is a front view, FIG.7 (B) is side sectional drawing. It is a disassembled perspective view which shows an example of a structure of the conventional optical path switching apparatus. FIG. 9A is a front view for explaining the movement of all blade members of the optical path opening and closing device of FIG. 8, FIG. 9A shows when the optical path is open, and FIG. 9B shows when the optical path is closed. FIG. 10A is a front view for explaining the movement of one blade member of the optical path opening and closing device of FIG. 8, FIG. 10A shows when the optical path is open, and FIG. 10B shows when the optical path is closed. . It is a figure for demonstrating the basic composition of an imaging device. It is sectional drawing which shows the structure of the imaging device which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical path switch 10 Combination blade 11 Blade member 13 Diaphragm forming edge 15 Supporting hole 17 Cam groove 20 Windmill 21 Supporting pin 23 Rib 25 Extension part 27 Rack 29 Light-shielding plate 30 Ground plane A
31 Optical path opening 33 Sliding surface 35 Cam pin 37 Convex strip 39 Concave portion 41 Guide groove 43, 45 Stopper 50 Base plate B
51 Optical path opening 53 Convex strip 55 Hole 57 Groove 300 Imaging device 301 Lens barrel 303, 317 Guide bar 304, 308 Drive unit 310 Lens group 311 Objective lens 312 Variable lens 313 Lens 314 Focus lens 316, 317 Holder 320 Solid imaging device 321 Image processing unit 323 Operation processing unit 325 Control unit

Claims (5)

An optical path opening and closing device comprising a film-like combination blade having a fulcrum and a cam groove, and opening and closing the optical path opening as it rotates, and a pair of ground plates sandwiching the combination blade,
In the combination blades, there is a pair of blades (X blades, Y blades) that do not overlap at the opening limit but overlap during the closing operation,
A long ridge that supports the Y blade surface is formed on the base plate so that the Y blade floats relative to the X blade and the X blade enters the lower surface of the Y blade. An optical path opening and closing device.   The optical path opening and closing device according to claim 1, wherein a plurality of blades in the combination blades are supported on the ridges by being stacked from top to bottom in the rotation direction of the blades.   The optical path opening and closing device according to claim 1, wherein the ridges are formed on each of the pair of ground planes.   4. The optical path switching device according to claim 3, wherein the ridges formed on the pair of ground plates are formed symmetrically with respect to the optical axis. An imaging apparatus having an optical path opening / closing mechanism for opening and closing an optical path opening,
The optical path opening / closing mechanism is
An optical path opening and closing device comprising a film-like combination blade having a fulcrum and a cam groove, and opening and closing the optical path opening as it rotates, and a pair of ground plates sandwiching the combination blade,
In the combination blades, there is a pair of blades (X blades, Y blades) that do not overlap at the opening limit but overlap during the closing operation,
A long ridge that supports the Y blade surface is formed on the base plate so that the Y blade floats relative to the X blade and the X blade enters the lower surface of the Y blade. An imaging device.

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