JP2010204201A - Filter device for optical apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turret type filter device which prevents filter plates from being attached at different parts and allows them to be reattached. <P>SOLUTION: A filter chamber is constituted between a ground plate 1 and a cover plate 2 and an opening 1b which regulates an optical path is formed on the ground plate 1, and an opening 2b is formed at a part opposite to the opening 1b on the cover plate 2. Three openings 3c, 3d, 3e which can be faced to the optical path are formed so as to individually cover two openings 3c, 3d of the three openings in a rotating section 3, which is rotatably attached to the filter chamber, and a first filter plate 4 and a second filter plate 5, different in density are attached. Then, the first filter plate 4 and the second filter plate 5 have flexibility and are suitably attached in plate thickness of the rotation member 3, without having to depend on adhesion or welding. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a turret type filter device used in various optical instruments.

  It has a circular plate shape as a whole, and is provided with a rotating member formed with a plurality of openings each covered with a filter plate in different angular regions on the same circumference, and by rotating the rotating member There is known a turret type filter device that allows a desired filter plate to face an optical path. Such filter devices are employed in various optical devices such as for observation, monitoring, illumination, measurement, imaging (photographing), and color image production. Recently, filter plates used in such filter devices are increasingly thin and flexible except for those used in special optical equipment.

  The present invention relates to a turret type filter device for various optical equipments in which a flexible filter plate is attached to a rotating member as described above. ]) As an example of the filter device configured as described above, the amount of light for the camera can be controlled by attaching an ND filter plate having a different density for each opening to the rotating member. There is a description of the control device. On page 8 (paragraph [0037]) of Patent Document 1, the rotating member to which the ND filter plate is attached does not have to be circular, and may be fan-shaped when the number of openings is small. It is described.

Japanese Patent Laid-Open No. 11-218797

  By the way, in the case of a filter device mainly used in a small precision optical instrument, the plate-like rotating member is flexible except for a limited region such as a rotation center portion. In order to attach a filter plate having a surface, it may be required to provide a portion protruding from the plate surface or not to attach the filter plate on the plate surface. In such a case, conventionally, it has been usual to form a recess by thinning the periphery of the opening, and to bond or heat-melt the filter plate in the recess.

  However, there is a problem in that predetermined transmission light cannot be obtained due to a difference in the thermal expansion coefficient between the filter plate and the rotating member due to a difference in the environment (temperature) due to distortion of the filter plate. there were. In addition, these attachment methods have a problem that once attached, the filter plate can hardly be reattached or replaced. In particular, when attaching with an adhesive, it is necessary to pay close attention to prevent the adhesive from protruding from the adhesive surface and sticking to the effective surface of the filter plate, or the time until the adhesive dries. The work efficiency was extremely poor, such as too long, which was a factor of high cost.

  In addition, in the conventional filter devices, when the size and shape of the plurality of openings formed in the rotating member are substantially the same, when attaching different types of filter plates to the rotating member, Has the problem that it may be attached to different locations. Furthermore, when both sides of the filter plate are finished in different states, there is a problem that the filter plate may be mounted upside down even if the mounting location is not wrong.

  The present invention has been made to solve such problems, and an object of the present invention is to form a plurality of filter plates on the rotating member with respect to the rotating member having a plate shape. A turret type filter for optical equipment with excellent workability and low cost, which covers each opening, and can be suitably mounted within the thickness of the rotating member regardless of adhesion or welding. Is to provide a device. It is also preferable to provide a turret type filter device for an optical apparatus in which the filter plate is not attached in the wrong way.

  In order to achieve the above object, a filter device for an optical device according to the present invention includes a ground plate having an optical path opening, and is rotatably attached to the ground plate so that the center from the center of rotation to the center of the opening is substantially omitted. A plurality of openings having at least a first opening and a second opening are formed so as to have the same distance, and the openings are rotated one by one by the driving means to be the openings for the optical path one by one. A plate-shaped rotating member that can be opposed to each other, a flexible first filter plate that is attached to the rotating member so as to individually cover the first opening and the second opening, and a first filter plate And at least one first thin wall formed thinly on one surface side within the plate thickness at each edge of the first opening and the second opening. And each of the first opening and the second opening The second thin portion formed thinly on the other surface side within the plate thickness, and each filter plate has a plurality of tongue pieces protruding from the outer peripheral portion. Then, the tongue piece is inserted between the at least one first thin portion and each of the second thin portions so as to be attached to the rotating member.

  In this case, in the rotating member, each of the second thin portions is formed on the outer side in the outer peripheral direction of the first opening and the second opening than the at least one first thin portion, and the one If it is formed so that the surface side is open, each filter plate is bent, and the tongue piece portion can be easily inserted between the protruding portion and the receiving surface portion.

  Further, the at least one first thin portion and each of the second thin portions formed at the edge of the second opening are formed such that the at least one thin portion is formed on the other surface side. Even if the second thin portion is formed on the one surface side, the problem of the present invention can be solved.

  Further, in the plurality of tongue pieces formed on the first filter plate and the plurality of tongue pieces formed on the second filter plate, the shape, size, number, When at least one of them is different and each of the second thin portions formed at the respective edges of the first opening and the second opening is also formed corresponding to them, The filter plate is not attached to the wrong place.

  Furthermore, if at least one of the first filter plate and the second filter plate has a shape that is not symmetrical with respect to a line passing through the center, the front and back of the filter plate are not mistakenly attached. .

  In the rotating member having at least a first opening and a second opening, at least one first thin portion is provided at each edge of the first opening and the second opening. The second thin portion is formed on one surface side within the plate thickness, and the second thin portion is provided at a plurality of positions on each edge of the first opening and the second opening, respectively, and the other surface within the plate thickness. Thinly formed on the side, and on the other hand, each of the first filter plate and the second filter plate is provided with a plurality of tongue pieces protruding from the outer peripheral portion, and the filter plates are attached. At that time, the filter plates are bent and the respective tongue pieces are inserted between the first thin portion and the second thin portion, so that both surfaces are always kept flat without distorting the rotating member. Can be installed, and the filter plate can be installed easily and at low cost. There is an effect that becomes.

It is a disassembled perspective view of an Example. It is the top view which looked at the rotation member of the state which attached the filter board from the cover board side shown by FIG. FIG. 3 is a plan view showing the rotating member in the state shown in FIG. 2 as seen from the back side of FIG. 2. It is the fragmentary sectional view which cut | disconnected by the AA line of FIG. 2 and looked at the arrow direction. It is the fragmentary sectional view which cut | disconnected by the BB line of FIG. 2 and looked at the arrow direction. It is the top view which showed the 1st filter board in FIG. 2 alone. It is the top view which showed the 2nd filter board in FIG. 2 alone. It is the top view which showed another example of the shape of a filter board. It is the top view which showed another example of the shape of a filter board.

  The mode for carrying out the present invention will be described with reference to the illustrated embodiments. In this embodiment, a light amount control device for a camera is formed by forming three openings in a rotating member and attaching two ND filter plates having different densities so as to cover two of them. It is constituted as follows. However, the filter device of the present invention is not limited to the one configured as a light amount control device for a camera, and may be configured as a filter device used for various optical devices as described above.

  As shown in FIG. 1, the camera light amount control device of the present embodiment is mainly attached to the ground plate 1 and the cover plate 2 constituting the filter chamber between them and to be rotatable in the filter chamber. And the first filter plate 4 and the second filter plate 5 that have flexibility and are attached to the rotation member 3. The base plate 1, the cover plate 2, the rotating member 3, the first filter plate 4, and the second filter plate 5 are all made of synthetic resin.

  First, the base plate 1 has a shape of a circular basin, and a shaft 1a is erected at the center, and a circular optical path opening 1b is formed in a side region of the shaft 1a. Yes. In addition, six screw holes 1c, 1d, 1e, 1f, 1g, and 1h are formed on the edge of the base plate 1. Of these, three screw holes 1d, 1f, and 1h are not shown. It is a screw hole for attaching the apparatus of a present Example to a camera main body with three screws. 2 and 3, the position of the optical path opening 1b is indicated by a two-dot chain line.

  The cover plate 2 has a substantially circular shape, and a small hole 2a is formed at the center, and two circular openings 2b and 2c are formed with the hole 2a in between. Further, the cover plate 2 has three holes 2d, 2e, 2f formed on the outer peripheral portion. After the tip of the shaft 1a is fitted into the hole 2a, the holes 2d, 2e, 2f The three screws 6, 7, and 8 are passed through and screwed into the screw holes 1c, 1e, and 1g. In the attached state, the opening 2b faces the optical path opening 1b, but the diameter of the opening 2b is larger than the diameter of the optical path opening 1b. In FIG. 1, the center of the optical path is indicated by a one-dot chain line.

  In this embodiment, the ground plate 1 and the cover plate 2 attached to each other in this way are arranged in the camera with the cover plate 2 facing the subject, but are arranged with the ground plate 1 facing the subject. It doesn't matter. Further, since the present embodiment is manufactured as a unit and thus has such a configuration, the present invention is not limited to that manufactured as a unit. Therefore, when not manufactured as a unit, the base plate 1 of the present embodiment is a member fixed to the camera body, and the rotation member 3 described later is prevented from being detached from the shaft 1a, so that the cover plate 2 It is also possible to omit corresponding members.

  The rotating member 3 has a circular plate shape, and a gear portion 3a is integrally formed at the center portion on the cover plate 2 side, and a hole 3b formed at the center thereof is fitted to the shaft 1a. It is mounted rotatably. A gear 9 on the camera body side inserted into the opening 2c of the cover plate 2 meshes with the gear portion 3a.

  In this embodiment, the gear 9 is rotated by a stepping motor (not shown). However, the present invention may be rotated manually. Further, instead of the gear portion 3a of the present embodiment, the outer peripheral surface of the rotating member 3 may be a gear portion. Further, in this embodiment, the shaft 1a is erected on the ground plate 1, but the shaft 1a is not erected on the ground plate 1, and the shaft portion is provided on both surfaces of the rotation center of the rotating member 3, The shaft portion may be supported by the base plate 1 and the cover plate 2.

  The rotating member 3 is formed with a first opening 3c, a second opening 3d, and a third opening 3e. The two openings 3c and 3d are individually covered so as to cover the first opening 3c, the second opening 3d, and the third opening 3e. A first filter plate 4 and a second filter plate 5 are attached. Therefore, the configuration of the two filter plates 4 and 5 and their specific mounting configuration with respect to the rotating member 3 will be described mainly with reference to FIGS.

  First, the first filter plate 4 shown in FIG. 6 and the second filter plate 5 shown in FIG. 7 are viewed from the cover plate 2 side. It is made of the same material (eg, PET) that is thin and flexible and has the same thickness. And, they deposit ND filter material only on the surface on the cover plate 2 side, but the second filter plate 5 is deposited so that the concentration is higher than that of the first filter plate 4. Yes.

  The first filter plate 4 is formed with three tongue pieces 4a, 4b, 4c so as to protrude from the outer periphery. Among them, the tongue piece 4a and the tongue piece 4b have the same shape, but only the tongue piece 4c has a slightly larger similar shape. On the other hand, four tongue pieces 5a, 5b, 5c and 5d are formed on the second filter plate 5 so as to protrude from the outer peripheral portion. Among them, the three tongue pieces 5a, 5b, 5c have the same shape and the same shape as the above-mentioned tongue pieces 4a, 4b, but only the tongue piece 5d has a slightly larger shape. And it is the same shape as said tongue piece part 4c. In the present embodiment, three tongue pieces are formed on the first filter plate 4 and four tongue pieces are formed on the second filter plate 5 as described above, but can be understood from the following description. Thus, the same number may be used as long as it is plural.

  Thus, the first filter plate 4 and the second filter plate 5 are generally the same in shape and size, but differ in the number of tongue pieces. In FIGS. 6 and 7, the lines passing through the respective centers are indicated by alternate long and short dash lines. In the first filter plate 4 and the second filter plate 5, the tongue piece portion 4c and the tongue piece portion 5d are The formation positions only coincide, and the other tongue pieces are not formed at the coincident positions. Furthermore, neither the first filter plate 4 nor the second filter plate 5 has a symmetrical shape with respect to any line passing through the center of each.

  Next, the three openings 3c. The shape of the periphery of 3d and 3e will be described. First, on the edge of the first opening 3c, two first thin films are formed along the surface (the front surface in FIG. 2) facing the cover plate 2 within the thickness of the rotating member 3. The thin portions 3f and 3g are formed in an arc shape so as to protrude toward the center of the opening 3c. The two first thin portions 3f and 3g are connected to each other by connecting the first first portions 3f and 3g. You may form so that it may become a thin part, and you may form so that it may become three 1st thin parts by dividing the 1st thin part 3f into two in the middle of the length direction.

  Further, at the edge of the first opening 3c, on the outer side of the first thin portion 3f, the surface on the side facing the base plate 1 within the thickness of the rotating member 3 (the front side in FIG. 3). Two second thin portions 3h and 3i are formed thinly along the surface. And in the case of a present Example, those 2nd thin parts 3h and 3i are formed in the bowl shape in the planar shape, and the surface side (FIG. 4 of FIG. 4) which opposes the cover board 2 so that FIG. The right side) is open.

  Similarly, the second thin portion 3j formed thinly along the surface facing the base plate 1 within the plate thickness of the rotating member 3 outside the other first thin portion 3g. Is formed. In the case of the present embodiment, the second thin portion 3j is formed in the shape of a straw hat, and the surface side facing the cover plate 2 (the left side in FIG. 5) is open as can be seen from FIG. It is in a state.

  At the edge of the second opening 3d, two first thin portions formed thinly along the surface facing the cover plate 2 (surface on the near side in FIG. 2) within the thickness of the rotating member 3 3k and 3m are formed in an arc shape so as to project toward the center of the opening 3d, but the two first thin portions 3k and 3m are connected to each other to form one first thin portion. Or at least one of the first thin portions 3k, 3m is divided into two at approximately the middle in the length direction so that three or four first thin portions are formed. It doesn't matter.

  Further, on the edge of the second opening 3d, on the outer side of the first thin portion 3k, the surface on the side facing the base plate 1 within the thickness of the rotating member 3 (surface on the near side in FIG. 3). Are formed in the same manner as the second thin portions 3h and 3i described above. Further, two second thin layers formed on the outer side of the first thin portion 3m along the surface facing the base plate 1 (the front surface in FIG. 3) within the plate thickness of the rotating member 3. Two thin portions 3q and 3r are formed in the same manner as the second thin portion 3j. And the rotation member 3 is formed so that the surface side which opposes the cover board 2 of 2nd thin part 3n, 3p, 3q, 3r may be in an open state. In addition, the 3rd opening part 3e does not have the above 1st thin part and 2nd thin part formed in the peripheral part, and is only the shape like an oval or a barrel.

  Of the openings, the first opening 3c and the second opening 3d have the first filter plate 4 and the second filter plate 5, respectively, with their vapor deposition surfaces facing the cover plate 2 side. It is attached from the main plate 1 side. First, how to attach the first filter plate 4 will be described. First, the tongue piece 4a is inserted between the first thin part 3f and the second thin part 3h, and the tongue piece 4b is inserted between the first thin part 3f and the second thin part 3i. At this time, as can be understood from FIG. 4, the tongue piece 4a is inserted from the lower left to the upper right in FIG. 4, but in the present embodiment, the second thin portion 3h is Since the first thin portion 3f is formed on the outer side, that is, the upper side in FIG. 4, and the cover plate 2 side of the second thin portion 3h, that is, the right side in FIG. 4 is opened, the tongue piece portion 4a is bent. And can be inserted straight. The tongue piece 4b is also inserted in substantially the same manner, although the first filter plate 4 is slightly bent.

  Next, the tongue piece portion 4c is inserted between the first thin portion 3g and the second thin portion 3j by largely bending the first filter plate 4, and this time can be understood from FIG. The tongue piece 4c is inserted from the upper right to the lower left in FIG. 5, so that it can be inserted straight without bending the tongue piece 4c for the same reason as described above. can do. Then, as the tongue piece 4c is inserted, the first filter plate 4 is restored to the flat plate shape by its own restoring force, and the attached state as shown in FIGS. 4 and 5 is obtained. Become.

  In the case of the present embodiment, the insertion of the tongue piece 4c is performed by greatly bending the first filter plate 4 when the tongue piece 4c is inserted rather than when the tongue pieces 4a and 4b are inserted. It becomes difficult to work. For this reason, the planar shape of the second thin portion 3j is formed in a straw hat shape as described above and the frontage is slightly enlarged, but it is formed in a hook shape in accordance with the other second thin portions 3h, 3i. It doesn't matter. In any case, the shape of the second thin portion of the present invention is not limited to these shapes.

  Further, as shown in FIGS. 4 and 5, in this embodiment, the tongue pieces 4a, 4b, 4c are connected to the second thin portions 3h, 3i, 3j when the first filter plate 4 is attached. The entire surface is not contacted with the opposing surface, but may be contacted with the entire surface in the same manner as with the first thin portions 3f and 3g.

  In the present embodiment, the shape of the second thin portions 3h, 3i, 3j with the cover plate 2 side open is mainly for the reason described above. There is also an advantage that the mold can be easily manufactured. Further, the mold can be easily manufactured by not forming the first thin portions 3f and 3g so as to overlap the second thin portions 3h, 3i and 3j. However, the rotating member of the present invention is not limited to such a shape. For example, the rotating member 3 in the present embodiment may be configured as an integrated unit of two members that are cut into pieces, and at this time, the open portion may not be formed, or the first thin portion 3f. , 3g may be overlapped with the second thin portions 3h, 3i, 3j.

  In the case of the present embodiment, the first thin portions 3f and 3g are formed along the surface of the rotating member 3 on the cover plate 2 side, and the second thin portions 3h, 3i and 3j are formed as the rotating member. 3 is formed so as to be along the surface of the base plate 1 side, but if the first thin portions 3f, 3g and the second thin portions 3h, 3i, 3j are formed to be opposite surfaces. At least one of them may be formed by retracting from the surface of the rotating member 3. Furthermore, in the case of the present embodiment, the rotating member 3 is arranged so that the first thin portions 3f, 3g are on the cover plate 2 side, but may be arranged so that it is on the base plate 1 side. I do not care. And here, what has been described about the shapes of the first thin portions 3f, 3g and the second thin portions 3h, 3i, 3j of the rotating member 3 is that the first thin portions 3k, 3k, 3m and the shapes of the second thin portions 3n, 3p, 3q, 3r are also applied.

  By the way, in the case of a present Example, when attaching the 1st filter board 4 to the rotation member 3 as mentioned above, when the 1st filter board 4 is turned upside down, it cannot attach and a vapor deposition surface is always It is made to be on the cover plate 2 side. That is, as described above, the first filter plate 4 does not have a symmetric shape with respect to any line passing through the center. Therefore, the first filter plate 4 is turned over, the tongue piece 4a is inserted between the first thin part 3f and the second thin part 3i, and the tongue piece 4b is inserted into the first thin part 3f and the second thin part 3h. If the tongue piece 4c is inserted between the first thin portion 3g and the second thin portion 3j, the tongue piece 4c cannot be inserted between the first thin portion 3g and the second thin portion 3j. This also applies to the case where the tongue piece 4c is inserted earlier than the tongue pieces 4a and 4b.

  Next, how to attach the second filter plate 5 will be described. Since the attachment method is performed according to the case of the first filter plate 4 described above, it will be briefly described. First, the tongue piece 5a is inserted between the first thin part 3k and the second thin part 3n, and the tongue piece 5b is inserted between the first thin part 3k and the second thin part 3p. At this time, since the second thin portions 3n and 3p are formed outside the second opening 3d rather than the first thin portion 3k and the cover plate 2 side is opened, the tongue pieces 5a and 5b are It is inserted almost straight.

  Thereafter, the second filter plate 5 is largely bent, whereby the tongue piece 5c is placed between the first thin part 3m and the second thin part 3q, the tongue piece 5d is placed between the first thin part 3m and the second thin part 3q. Insert between the thin portions 3r. Also at this time, the second thin portions 3q and 3r are formed outside the second opening 3d with respect to the first thin portion 3m, and the cover plate 2 side is opened, so the tongue pieces 5c and 5d Is inserted substantially straight, but then the second filter plate 5 returns to a flat plate shape by its own restoring force and is in an attached state.

  In the case of the second filter plate 5 as well, the rotating member 3 cannot be attached if it is turned upside down. This is because, similarly to the case of the first filter plate 4, the second filter plate 5 does not have a symmetric shape with respect to any line passing through the center. In the present embodiment, since the first filter plate 4 and the second filter plate 5 are attached in this manner, they can be easily attached to and detached from the rotating member 3 and can be replaced at the time of repair.

  By the way, in the case of the present embodiment, three tongue pieces 4a, 4b, 4c are formed on the first filter plate 4, and four tongue pieces 5a, 5b, 5c, 5d are formed on the second filter plate 5. This is to prevent mistaken attachment positions when the two filter plates 4 and 5 are attached to the rotating member 3. However, the configuration for avoiding the mistake in the attachment positions of the two is not limited to such a configuration, and at least one of the shape, size, number, and formation location of the tongue pieces is different. Even get it.

  In the present embodiment, the first filter plate 4 and the second filter plate 5 are both attached to the rotating member 3 from the same surface side, but the present invention has such a configuration. For example, the first filter plate 4 may be attached from the cover plate 2 side, and the second filter plate 5 may be attached from the ground plate 1 side. In the present embodiment, the first opening 3c and the second opening 3d have substantially the same size and the same shape. However, in the present invention, they may have different sizes or different shapes. Absent. In such a case, it is not necessary to take into account a configuration that takes into account a mounting error on the front and back sides and a mounting location as in the present embodiment.

  Next, the operation of this embodiment will be described. As shown in FIGS. 1 to 3, when the camera light amount control device of this embodiment is not photographing, the first opening 3c exists in the optical path, and the subject light passes through the first filter. It is in a state of passing through the plate 4. When the release button (switch) of the camera is pressed in this state, if the brightness of the subject light is within the standard brightness range according to the measurement result of the photometry circuit, the image is taken as it is. Further, when the brightness of the subject light is brighter than the standard brightness range, the rotating member 3 is counteracted in FIG. 2 via the gear 9 shown in FIG. 1 by a stepping motor (not shown). Photographing is performed with the second filter plate 5 inserted into the optical path after being rotated clockwise by 120 degrees.

  When the brightness of the subject light is darker than the standard brightness range, the rotating member 3 is rotated 120 degrees clockwise in FIG. 2 by the stepping motor, and the filter plates 4 and 5 are inserted into the optical path. Shooting is performed in the state without. Then, when shooting is completed, the state shown in FIGS. 1 to 3 is restored. When this embodiment is employed in a movie camera, the rotating member 3 is rotated in either direction in units of 120 degrees in response to changes in subject light during shooting. Further, in this embodiment, if the stop position of the rotating member 3 becomes unstable due to the influence of the backlash of the gear mechanism, notches are formed at three locations on the peripheral surface of the rotating member 3. A click mechanism may be employed.

  As described above, in the present embodiment, the first filter plate 4 and the second filter plate 5 are manufactured by depositing the ND filter material only on one surface of the substantially transparent same material (for example, PET). However, in the present invention, the filter plates 4 and 5 may be manufactured by vapor-depositing ND filter materials on both sides, or may be manufactured only by the ND filter material. . When manufactured in such a manner, it is not necessary to consider an attachment error between the front and back sides as in the present embodiment, and only an error in the attachment location needs to be considered.

  Therefore, in such a configuration, a first filter plate 10 which is a modified example of the first filter plate 4 is shown in FIG. 8, and a second filter plate 11 which is a modified example of the second filter plate 5 is shown in FIG. It is shown. According to this, each of the filter plates 10 and 11 has a symmetrical shape with respect to the alternate long and short dash line passing through the center, and either surface may be attached to either direction.

  The first filter plate 10 has two tongue pieces 10a and 10b, and the second filter plate 11 has three tongue pieces 11a, 11b and 11c. Therefore, as a matter of course, the shapes of the first thin part and the second thin part on the rotating member 3 side into which the tongue pieces are inserted have shapes corresponding to them. Therefore, even if the first filter plate 10 and the second filter plate 11 can be attached to the rotating member 3 in the postures of FIGS. 8 and 9, they cannot be attached in the posture that is upside down.

  Further, the tongue piece portion 10b of the first filter plate 10 and the tongue piece portion 11c of the second filter plate 11 have the same shape, but the tongue piece portion 10a of the first filter plate 10 is formed of the second filter plate 11. Cannot be inserted into two insertion portions formed separately for the tongue pieces 11a and 11b. Further, since the dimension in the width direction required for forming the two tongue pieces 11a and 11b of the second filter plate 11 is larger than the width dimension of the tongue piece 10a of the first filter plate 10, the tongue piece 10a. The two tongue pieces 11a and 11b cannot be inserted into the insertion portion formed for the purpose. For this reason, the two filter plates 10 and 11 are not attached in the wrong place.

  In this embodiment, the light amount of the subject light can be controlled in three stages. However, in the case where it is possible to control in four stages, the light path is reduced without being covered with the filter plate. A fourth opening that is smaller than the third opening 3e, or the size of the first opening 3c and the second opening 3d is substantially the same, but the first filter plate 4, A fourth opening that is covered with a filter plate having a concentration different from that of the second filter plate 5 is provided. In the present embodiment, the rotating member 3 is provided with the third opening 3e that is not covered with the filter plate. However, the third opening 3e is defined as the first filter plate 4 and the second filter plate 5. By covering with a filter plate having a different density, a light amount control device of three-stage control different from the present embodiment may be used. Therefore, the rotating member of the present invention is not limited to one provided with two openings covered with a filter plate, and may be provided with three or more.

  Furthermore, as described above, the present invention can be used for various observation, monitoring, illumination, measurement, and imaging (imaging) as long as the filter plate attached to the rotating member is flexible. ), Color image production, and other optical devices. In the present invention, as in the embodiment, the rotating member may not be circular but may have a fan shape.

DESCRIPTION OF SYMBOLS 1 Ground plate 1a Axis 1b Optical path opening 1c-1h Screw hole 2 Cover plate 2a, 2d, 2e, 2f, 3b Hole 2b, 2c Opening 3 Rotating member 3a Gear part 3c 1st opening 3d 2nd opening 3e 1st 3 opening 3f, 3g, 3k, 3m 1st thin part 3h-3j, 3n, 3p-3r 2nd thin part 4,10 1st filter plate 4a-4c, 5a-5d, 10a, 10b, 11a-11c Tongue One part 5,11 Second filter plate 6,7,8 Screw 9 Gear

Claims (5)

  A ground plate having an optical path opening, and at least a first opening and a second opening are attached to the ground plate so as to be rotatable and have substantially the same distance from the center of rotation to the center of the opening. A plate-like rotary member that has a plurality of openings formed therein and is rotated by the driving means so that the openings can be opposed to the optical path openings one by one, and the first opening, A flexible first filter plate and a second filter plate attached to the rotating member so as to individually cover the second opening, and the rotating member includes the first opening. At least one first thin portion formed thinly on one surface side within the plate thickness, and a plurality of edges of each of the first opening and the second opening. The second meat thinly formed on the other surface side within the plate thickness Each filter plate has a plurality of tongue pieces protruding from an outer peripheral portion, and the tongue pieces are divided into the at least one first thin portion and each second thin portion. An optical device filter device, wherein the filter device is inserted between the first and second members and attached to the rotating member.   In the rotating member, each of the second thin portions is formed on the outer side in the outer peripheral direction of the first opening and the second opening than the at least one first thin portion, and the one surface side is 2. The filter device for an optical apparatus according to claim 1, wherein the filter device is formed to be open.   The at least one first thin portion and each of the second thin portions formed at the edge of the second opening are formed such that the at least one thin portion is formed on the other surface side, 2. The filter device for an optical device according to claim 1, wherein a thin portion is formed on the one surface side.   Of the plurality of tongue pieces formed on the first filter plate and the plurality of tongue pieces formed on the second filter plate, the shape, size, number, At least one of them is different, and each of the second thin portions formed at the respective edges of the first opening and the second opening is also formed corresponding to them. Item 4. The optical device filter device according to any one of Items 1 to 3.   5. The filter device for an optical apparatus according to claim 4, wherein at least one of the first filter plate and the second filter plate has a shape that is not symmetric with respect to a line passing through a center.

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