JP2011107600A - Optical element-switching device and lens barrel equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To selectively place the desired optical element of a plurality of optical elements on an optical path, while suppressing an increase in the size of a lens barrel in an outer diameter direction and in an optical axis direction. <P>SOLUTION: An optical filter switching mechanism includes: a base 202 including an opening through which light of an object passes; a cam 203 supported to be turnable around an optical axis with respect to the base 202; a plurality of filter frames 201 having the same number as the number of ND filters 302, arranged on one and the same plane surface orthogonal to the optical axis, supported by the base 202 to be turnable with one ends as respective supporting shafts, and each holding the ND filter 302; and a guide mechanism guiding the plurality of filter frames 201 by the turning of the cam 203 so that the plurality of filter frames 201 are movable between positions where the plurality of filter frames 201 overlap with the opening 301 and retract positions where the plurality of filter frames are retracted from the opening 301 so as not to interfere with each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention includes an optical element switching device that includes a plurality of optical elements and appropriately switches an optical element positioned in an optical path so that a desired optical element among the plurality of optical elements can be selectively used, and the optical element switching thereof The present invention relates to a lens barrel provided with the device.

  Conventionally, for example, ND filter switching that includes a plurality of ND filters having different densities and switches the position of each ND filter relative to the optical path so that a desired ND filter among the ND filters is selectively positioned on the optical path. There was a lens device with a mechanism. A lens apparatus equipped with such an ND filter switching mechanism is incident on the lens barrel by switching the position of each filter so that a desired ND filter is selectively positioned on the optical path in accordance with a shooting situation or the like. The amount of external light to be adjusted can be adjusted in multiple stages.

  As described above, conventionally, among a plurality of optical elements such as a plurality of ND filters having different densities, the optical element positioned on the optical path can be switched so that the desired optical element is selectively positioned on the optical path. And an optical device provided with the optical element switching mechanism. An example of a conventional optical element switching mechanism in such an optical device will be described.

  FIG. 21 is an explanatory diagram showing an example of a conventional ND filter switching mechanism. In FIG. 21, a conventional ND filter switching mechanism 2100 includes a turret 2102 that supports a plurality of ND filters 2101. The turret 2102 is provided to be rotatable about a rotation shaft 2104 provided at a position retracted from the optical path 2103. A switching lever (not shown) for rotating the turret 2102 is connected to the turret 2102.

  In the turret 2102 provided in the conventional ND filter switching mechanism 2100, each ND filter 2101 is supported in a positional relationship such that the distance to the rotation shaft 2104 is equal. That is, each ND filter 2101 is provided on the same circumference with the rotation shaft 2104 as the center. The distance between each ND filter 2101 and the rotation shaft 2104 is equal to the distance between the optical path 2103 and the rotation shaft 2104, respectively.

  In the conventional ND filter switching mechanism 2100 having such a configuration, when the operator of the ND filter switching mechanism 2100 operates the switching lever, the turret 2102 connected to the switching lever is interlocked with the operation of the switching lever. Rotates around the rotation axis. Since the distance between each ND filter 2101 and the rotating shaft 2104 is equal to the distance between the optical path 2103 and the rotating shaft 2104, it is positioned on the optical path 2103 by the rotation of the turret 2102 around the rotating shaft 2104. The ND filter 2101 to be used can be selectively switched. That is, there has been a technique in which the thickness in the optical axis direction is suppressed by attaching a plurality of filters to one holding frame and by using one rotation fulcrum of the switching mechanism.

  Conventionally, for example, a filter is stored and installed together with a switching mechanism and a storage mechanism between a low-pass filter and a spectral prism on an optical path that is the smallest regardless of the aperture of the imaging lens, and a plurality of filters are arranged on one shaft. When the filter is removed from the optical path, such as when the filter is not in use, such as when the filter is not used, a dummy glass that is held on a separate axis is stacked and stored by a rotating holder. There has been a technique configured to automatically return (see, for example, Patent Document 1 below).

  Specifically, in the technique described in Patent Document 1, a plurality of filters are respectively attached to holders (holding frames), and the respective holding frames are arranged so as to overlap each other in the optical axis direction. An ND filter switching mechanism (filter housing exchange mechanism for high-definition cameras) that does not protrude beyond the outer diameter of the cylinder is realized.

  Conventionally, the holder holding the ND filter is moved in and out in the direction perpendicular to the optical axis with the fulcrum axis as the center, and an operating piece protruding from the lens barrel is provided at the end extending from the fulcrum axis. A rotating link is arranged so as to be pivotable about the fulcrum axis along the outer surface of the lens barrel, and an operation piece to be engaged with the operating piece of the holder is provided on one end side of the rotating link and in the turning direction. There has been a technology that configures a link mechanism in which a toggle spring that is urged by a spring is provided on a rotating link, and the other end side of the rotating link is turned by a switching operation of a slide knob provided on an external housing (for example, (See Patent Document 2 below.)

Utility model registration No. 3146554 JP 11-194417 A

  However, in the conventional technique shown in FIG. 21 described above, it is possible to reduce the size of the switching device in the optical axis direction. However, the turret 2102 in the ND filter switching mechanism 2100 is different from the plurality of ND filters 2101. Since there is one rotation fulcrum (rotation shaft 2104), when the ND filter 2101 is switched, a part of the turret 2102 protrudes to the outer peripheral side of the outer diameter of the lens barrel (dotted line frame 2105 in FIG. 21). See). For this reason, there existed a problem that size reduction in the radial direction of a lens-barrel was difficult.

  In addition, in the conventional technique described in Patent Document 1 described above, it is possible to achieve downsizing in the outer diameter direction of the lens barrel, but because it is a structure in which a plurality of filters are arranged to overlap in the optical axis direction, There was a problem that downsizing in the optical axis direction was difficult.

  Further, in the conventional technique described in Patent Document 2 described above, it is necessary to provide a link mechanism for moving the ND filter in and out of each ND filter. That is, in a lens apparatus provided with a plurality of ND filters, a plurality of link mechanisms are required. For this reason, there are problems that the number of parts increases and the structure becomes complicated.

  In order to solve the above-described problems caused by the conventional technology, the present invention selectively suppresses the desired optical element among the plurality of optical elements while suppressing the increase in the size of the lens barrel in the outer diameter direction and the optical axis direction. An object of the present invention is to provide an optical element switching device that can be positioned on a road.

  In order to solve the above-described problems and achieve the object, an optical element switching device according to the present invention includes a fixed base member having an opening through which light of a subject passes, and a rotation about an optical axis with respect to the fixed base member Rotating cam members that are supported and the same number as the optical elements are arranged on the same plane orthogonal to the optical axis, and each is supported by the fixed base member so as to be rotatable about one end portion as a supporting shaft. A plurality of holding members each holding the optical element, and a position overlapping the opening and the opening so that the plurality of holding members do not interfere with each other due to the rotation of the rotating cam member. And a guide mechanism that is movably guided between the retracted respective retracted positions.

  In the optical element switching device according to the present invention, in the above invention, the guide mechanism includes a cam pin provided in the holding member, a first cam provided in the fixed base member and fitted to the cam pin. And a second cam that is fitted to the cam pin and provided on the rotating cam member, and the first cam is formed by an arc portion whose distance to one end of the holding member is always constant. The second cam is formed by a circumferential portion where the distance to the optical axis is always constant and a deforming portion where the distance to the optical axis changes, and the rotating cam member includes the first cam When the optical element is rotated by a predetermined angle, one of the optical elements is positioned at the opening, and the cam pin corresponding to the optical element is positioned at a position closest to the optical axis in the deformed part, Before the optical element It is positioned at the retracted position, and the cam pin corresponding to the other said optical element, characterized in that is positioned in the circumferential portion.

  The optical element switching device according to the present invention is the optical element switching device according to the first aspect, wherein the deforming portion forms a first angle with respect to a circumferential direction around the optical axis, and the first deforming portion. And at least one of the cam pins when the rotating cam member is rotated to the first predetermined angle. And the second connecting portion between the first deforming portion and the second deforming portion, or the second connecting portion between the deforming portion and the circumferential portion.

  The optical element switching device according to the present invention is the optical element switching device according to the first aspect, wherein the deforming portion forms a first angle with respect to a circumferential direction around the optical axis, and the first deforming portion. When the rotating cam member is rotated to a second predetermined angle, all the optical elements are positioned at the retracted position. When the rotating cam member is rotated to the first predetermined angle or the second predetermined angle, at least one of the cam pins is moved between the first deformable portion and the second deformable portion. It is located in the 1st connection part or the 2nd connection part of the said deformation | transformation part and the said circumference part, It is characterized by the above-mentioned.

  In the optical element switching device according to the present invention as set forth in the invention described above, the holding member is disposed between the fixed base member and the rotating cam member.

  In the optical element switching device according to the present invention as set forth in the invention described above, the fixed base member is disposed between the holding member and the rotating cam member.

  In the optical element switching device according to the present invention as set forth in the invention described above, the fixed base member has a substantially L-shaped projecting portion projecting in a substantially optical axis direction from a surface facing the rotating cam member. The protruding portion or the rotating cam member is formed of an elastic member, and the rotating cam member is attached to the protruding portion in a bayonet form, and the rotating cam member is the fixed base member. The surface that does not oppose to the protrusion is provided at the same position in the optical axis direction as the surface of the protrusion substantially orthogonal to the optical axis.

  In the optical element switching device according to the present invention as set forth in the invention described above, the optical element is a filter.

  The lens barrel according to the present invention is a lens barrel provided with the optical element switching device described above, and the rotating cam member and the fixed base member have a substantially disc shape centered on the optical axis. Thus, the outer diameter of the rotating cam member is formed smaller than the outer diameter of the fixed base member, and is provided between the outer peripheral portion of the lens barrel and the rotating cam member and orthogonal to the optical axis. Another member provided at a position where the rotating cam member is stacked along the direction is provided.

  According to the optical element switching device according to the present invention, a desired optical element among a plurality of optical elements is selectively positioned on the optical path while suppressing an increase in the size of the lens barrel in the outer diameter direction and the optical axis direction. There is an effect that can be.

It is explanatory drawing which shows the lens apparatus of embodiment concerning this invention. It is explanatory drawing (the 1) which shows the optical filter switching mechanism of embodiment concerning this invention. It is explanatory drawing (the 2) which shows the optical filter switching mechanism of embodiment concerning this invention. It is explanatory drawing (the 3) which shows the optical filter switching mechanism of embodiment concerning this invention. It is explanatory drawing (the 4) which shows the optical filter switching mechanism of embodiment concerning this invention. It is explanatory drawing (the 5) which shows the optical filter switching mechanism of embodiment concerning this invention. It is explanatory drawing (the 6) which shows the optical filter switching mechanism of embodiment concerning this invention. It is explanatory drawing (the 1) which shows each state which the optical filter switching mechanism of embodiment concerning this invention can take. It is explanatory drawing (the 2) which shows each state which the optical filter switching mechanism of embodiment concerning this invention can take. It is explanatory drawing (the 3) which shows each state which the optical filter switching mechanism of embodiment concerning this invention can take. It is explanatory drawing (the 4) which shows each state which the optical filter switching mechanism of embodiment concerning this invention can take. It is explanatory drawing (the 5) which shows each state which the optical filter switching mechanism of embodiment concerning this invention can take. It is explanatory drawing (the 6) which shows each state which the optical filter switching mechanism of embodiment concerning this invention can take. It is explanatory drawing (the 7) which shows each state which the optical filter switching mechanism of embodiment concerning this invention can take. It is a timing chart which shows the relationship between the rotation amount of a cam, and operation | movement of each ND filter. It is explanatory drawing (the 1) which shows operation | movement of the optical filter switching mechanism of embodiment concerning this invention. It is explanatory drawing (the 2) which shows operation | movement of the optical filter switching mechanism of embodiment concerning this invention. It is explanatory drawing (the 7) which shows the optical filter switching mechanism of embodiment concerning this invention. It is explanatory drawing (the 8) which shows the optical filter switching mechanism of embodiment concerning this invention. It is explanatory drawing which partially enlarges and shows the lens-barrel provided with the optical filter switching mechanism of embodiment concerning this invention. It is explanatory drawing which shows an example of the conventional ND filter switching mechanism.

  Exemplary embodiments of an optical element switching device according to the present invention will be explained below in detail with reference to the accompanying drawings.

  First, a configuration of an optical element switching device according to an embodiment of the present invention and an optical device including the optical element switching device will be described. FIG. 1 is an explanatory view showing a lens apparatus according to an embodiment of the present invention. FIG. 1 shows a cross section of the lens device according to the embodiment of the present invention, cut along a plane passing through the optical axis and parallel to the optical axis.

  In FIG. 1, a lens apparatus 100 according to an embodiment of the present invention includes a lens barrel 101. The lens barrel 101 has a substantially cylindrical shape. In the lens barrel 101, openings 102 and 103 that open the inside of the lens barrel 101 to the outside are provided at the end portions on the eyepiece side and the object side, respectively.

  The lens barrel 101 is attached to the main body of the imaging device with the end portion on the eyepiece side (the right side in the left-right direction in FIG. 1) facing the imaging device main body (not shown). In this embodiment, the lens device 100 can realize an optical device including an optical element switching device.

  An imaging photoelectric conversion element, that is, an imaging element is arranged in the imaging apparatus main body. The image sensor photoelectrically converts external light incident through the lens device 100 and outputs an electrical signal corresponding to the amount of incident light. Specifically, the imaging element can be realized by a solid-state imaging element such as a CCD image sensor (Charge Coupled Device Image Sensor) or a CMOS image sensor (Complementary Metal Oxide Semiconductor).

  A plurality (five in this embodiment) of lens groups 104, 105, 106, 107, and 108 are provided on the inner peripheral side of the lens barrel 101. The plurality of lens groups 104, 105, 106, 107, 108 are arranged in order from the objective side (left side in the left-right direction in FIG. 1), the first lens group 104, the second lens group 105, the third lens group 106, and the fourth lens group. The lens group 107 and the fifth lens group 108 are arranged in this order.

  Of the plurality of lens groups, the first lens group 104 provided on the most object side is constituted by a first lens frame 109 and a first lens 110 held by the first lens frame 109. The first lens 110 may be a single lens or a plurality of lenses.

  The first lens 110 in this embodiment is composed of a plurality of lenses arranged in the optical axis direction. In FIG. 1, the code | symbol C has shown the optical axis. The first lens frame 109 is attached to the objective side of the lens barrel 101 and has a substantially cylindrical shape. The position of the first lens frame 109 with respect to the lens barrel 101 is fixed.

  The second lens group 105, the third lens group 106, the fourth lens group 107, and the fifth lens group 108 are constituted by one lens or a plurality of lenses. The second lens group 105, the third lens group 106, the fourth lens group 107, and the fifth lens group 108 are respectively provided so as to be movable along the optical axis direction relative to the lens barrel 101. . About the structure which can move the 2nd lens group 105, the 3rd lens group 106, the 4th lens group 107, and the 5th lens group 108 along an optical axis direction, it is easily realizable using various well-known techniques. Therefore, the description is omitted.

  In the lens device 100, the second lens group 105, the third lens group 106, the fourth lens group 107, and the fifth lens group 108 are moved along the optical axis direction on the object side or in a state where the first lens group 104 is fixed. By moving to the eyepiece side, the focal position with respect to the image sensor provided in the imaging apparatus can be adjusted.

  In the lens barrel 101, an optical filter switching mechanism 120 is provided between the third lens group 106 and the fourth lens group 107. In this embodiment, an optical element switching device can be realized by the optical filter switching mechanism 120. The optical filter switching mechanism 120 includes a plurality of ND (Neutral Density) filters, and can selectively position any one of the ND filters on the optical path according to the operation of the operator. It is said that.

  2, FIG. 3, FIG. 4, FIG. 5, FIG. 6 and FIG. 7 are explanatory views showing an optical filter switching mechanism 120 according to an embodiment of the present invention. FIG. 2 shows a cross section of the optical filter switching mechanism 120 according to the embodiment of the present invention cut along a plane passing through the optical axis and parallel to the optical axis.

  FIG. 3 shows an exploded perspective view from the objective side of the optical filter switching mechanism 120 according to the embodiment of the present invention. 4, 5 and 6 show a state in which a part of the optical filter switching mechanism 120 according to the embodiment of the present invention is viewed from the objective side. In FIG. 7, a part of FIG. 2 is enlarged.

  2, 3, 4, 5, 6, and 7, the optical filter switching mechanism 120 according to the embodiment of the present invention includes a filter frame 201 (201 </ b> A, 201 </ b> B, 201 </ b> C), a base 202, A cam 203 and a fixing member 204 are provided. The filter frame 201, the base 202, the cam 203, and the fixing member 204 are arranged in the order of the filter frame 201, the base 202, the cam 203, and the fixing member 204 from the objective side along the optical axis direction.

  The fixing member 204 is fixed to the lens barrel 101. A base 202 is attached to the fixing member 204 via a screw 205. Thereby, the position of the base 202 with respect to the lens barrel 101 is fixed via the fixing member 204. The screw 205 fixes the fixing member 204 and the base 202 on the outermost peripheral side of the optical filter switching mechanism 120.

  The base 202 has a substantially disk shape with the optical axis C as the center. Further, the base 202 includes an opening 301 penetrating in the optical axis direction so as to open an optical path in the lens device 100. The opening 301 has a circular shape. The optical filter switching mechanism 120 is disposed with respect to the lens barrel 101 so that the center of the opening 301 in the base 202 coincides with the optical axis. In this embodiment, a fixed base member can be realized by the base 202. In this embodiment, the opening 301 can realize an opening through which the light of the subject passes.

  Each filter frame 201 holds an ND filter 302 (302A, 302B, 302C). The optical filter switching mechanism 120 of this embodiment includes three ND filters 302. For this reason, the optical filter switching mechanism 120 of this embodiment includes three filter frames 201. In this embodiment, an optical element can be realized by the ND filter 302. In this embodiment, the holding member can be realized by the filter frame 201.

  The number of ND filters 302 provided in the optical filter switching mechanism 120 is not limited to three. The number of ND filters 302 provided in the optical filter switching mechanism 120 may be four or more. Alternatively, the number of ND filters 302 included in the optical filter switching mechanism 120 may be two.

  The ND filter 302 reduces the amount of light passing through the ND filter 302 with respect to the amount of light incident on the ND filter 302. By using the ND filter 302, it becomes possible to reduce the shutter speed. For example, when taking a portrait in fine weather when using a large-aperture lens, it is possible to shoot in an open state or reduce the shutter speed. This makes it possible to shoot special effects by shooting for a long time.

  In this embodiment, a plurality of types (three types in this embodiment) of ND filters 302 having different degrees of darkness such as black or silver by metal deposition are attached. Specifically, for example, there are types such as “ND2”, “ND4”, “ND8”, and “ND400”. If “ND2”, the light amount is ½, and if “ND400”, the light amount is 1/400. It becomes. In the optical filter switching mechanism 120, the density of the ND filter 302 held by each filter frame 201 is different.

  Each filter frame 201 is provided with an opening 303 having substantially the same diameter as the opening 301. The ND filter 302 is held by the filter frame 201 so as to cover an opening provided in the filter frame 201. Specifically, the ND filter 302 is bonded to the filter frame 201 with an adhesive, for example.

  Each of the filter frames 201 includes a rotation fulcrum bearing portion 304. The rotation fulcrum bearing 304 provided in the filter frame 201 is inserted into the rotation fulcrum bearing 304 provided on the base 202. Thus, the filter frame 201 is pivotally supported on the base 202 via the rotation fulcrum bearing portion 304 provided in the filter frame 201 and the rotation fulcrum shaft 305 provided on the base 202, respectively.

  The filter frame 201 is provided so as to be rotatable about a rotation fulcrum bearing 304 provided in the filter frame 201 and a rotation fulcrum shaft 305 provided on the base 202. Each filter frame 201 is rotatable along a plane orthogonal to the optical axis C.

  The rotation fulcrum shafts 305 provided on the base 202 are provided on the same circumference around the center of the opening 301, that is, the optical axis C. Further, the rotation fulcrum shafts 305 provided on the base 202 are provided at equal intervals on the same circumference with the optical axis C as the center.

  In the filter frame 201, the distance between the opening 303 (center of the filter frame 201) and the rotation fulcrum bearing 304 and the rotation fulcrum shaft 305 (axis center) that pivotally supports the filter frame 201 on the base 202 is the base 202 is equal to the distance between the opening 301 (the center thereof) and the rotation fulcrum bearing 304 and the rotation fulcrum shaft 305 (the axis thereof).

  As a result, when the filter frame 201 rotates around the rotation fulcrum bearing 304 and the rotation fulcrum shaft 305 (the axis thereof), the ND filter 302 and the opening 301 held by the filter frame 201 overlap in the optical axis direction. The position or the position where the ND filter 302 is retracted from the opening 301 is positioned. In this embodiment, the ND filter 302 is retracted from the opening 301 and the position farthest from the opening 301 is set as the retracting position.

  The base 202 includes slits 306 (306A, 306B, 306C) that guide the rotational position of the filter frame 201. The slit 306 is realized by a groove having an arc shape provided in the base 202. More specifically, each of the slits 306 is realized by a groove having a shape in which the distance to the rotation center position of the corresponding filter frame 201 is always constant.

  The slits 306 are provided so as to correspond to the respective filter frames 201. That is, in the optical filter switching mechanism 120 of this embodiment, the base 202 is provided with three slits 306. In this embodiment, the first cam can be realized by the arc-shaped slit 306.

  Each filter frame 201 includes a cam pin 401. The cam pins 401 protrude along the optical axis direction from the eyepiece side surface of the filter frame 201 and are inserted into the corresponding slits 306, respectively. Each filter frame 201 (201A, 201B, 201C), that is, the ND filter 302 (302A, 302B, 302C) has a rotation fulcrum bearing 304 and a rotation fulcrum shaft 305 (axis center) according to the position of the cam pin 401 with respect to the slit 306. Rotate around the center.

  In addition, by inserting the rotation fulcrum bearing portion 304 provided in the filter frame 201 into the rotation fulcrum shaft 305 provided on the base 202, the filter frame centering on the rotation fulcrum bearing portion 304 and the rotation fulcrum shaft 305 (the axis thereof). Although the structure which enables 201 to rotate was demonstrated, it is not restricted to this. Any configuration may be employed as long as each filter frame 201 can be rotated along a plane orthogonal to the optical axis C around the axial center positions of the rotation fulcrum bearing portion 304 and the rotation fulcrum shaft 305.

  Specifically, for example, instead of the rotation fulcrum bearing 304 provided in the filter frame 201, an opening having substantially the same diameter as the rotation fulcrum shaft 305 provided in the base 202 is provided in the filter frame 201, and the filter frame 201 is provided. By inserting a rotation fulcrum shaft 305 provided on the base 202 into the opening, a configuration in which the filter frame 201 can be rotated about the rotation fulcrum shaft 305 (the axis thereof) may be realized.

  Specifically, for example, instead of the rotation fulcrum shaft 305 provided in the base 202, an opening having substantially the same diameter as that of the rotation fulcrum bearing 304 provided in the filter frame 201 is provided in the base 202. A configuration may be realized in which the filter frame 201 can be rotated about the rotation fulcrum bearing portion 304 (the axis thereof) by inserting the rotation fulcrum bearing portion 304 provided in the filter frame 201 into the opening.

  The cam 203 has a substantially disc shape centered on the optical axis C, and is sandwiched between the fixing member 204 and the base 202 in the optical axis direction. A circular cam opening 501 centering on the optical axis C is provided at the center. The cam opening 501 is provided so that the center of the cam opening 501 coincides with the center of the opening 301, that is, the optical axis C. The opening diameter of the cam opening 501 is larger than the opening diameter of the opening 301.

  The cam 203 is provided so as to be rotatable relative to the base 202 around the optical axis C. The position of the cam 203 relative to the base 202 is fixed so that the center of the cam opening 501 coincides with the optical axis C by a ring-shaped protrusion 701 protruding in the optical axis direction from the eyepiece side surface of the base 202.

  18 and 19 are explanatory views showing the cam 203. FIG. 18 and 19, the cam 203 includes protrusions 1801 and 1901 that protrude in a substantially optical axis direction from a surface facing the cam 203 and have a substantially L shape. The protrusions 1801 and 1901 are formed of an elastic member. Alternatively, not only the protrusion 1801 but the entire cam 203 may be formed of an elastic member.

  The cam 203 is attached to the protrusion 1801 in the form of a bayonet. The cam 203 is provided such that a surface that does not face the base 202 is located at the same position in the optical axis direction as a surface that is substantially orthogonal to the optical axis of the protrusion 1801. The protrusions 1801 and 1901 may be ring-shaped or a plurality of protrusions 1801 and 1901 may be provided on the same circumference around the optical axis.

  FIG. 20 is an explanatory view showing the lens barrel 101 in a partially enlarged manner. 20, in the lens barrel 101, a base 202 and a cam 203 are provided in a positional relationship as shown in FIG. 20 with respect to a head portion such as a pole or a motor.

  A gear 502 is provided on the outer peripheral edge of the cam 203. The gear 502 is connected to a switching lever (not shown). The gear and the switching lever are not limited to being directly connected, and may be connected via a gear train (not shown).

  A cam groove 503 is provided on the object-side surface of the cam 203. A cam pin 401 is fitted into the cam groove 503 through a slit 306. That is, the cam pin 401 passes through the base 202 in the plate thickness direction via the slit 306 and fits in the cam groove 503. The cam pin 401 is fitted into the cam groove 503 at a position where each slit 306 and the cam groove 503 intersect.

  The cam groove 503 includes a circumferential portion 503a whose distance to the optical axis C is always constant, and a deforming portion 503b whose distance to the optical axis C changes. In the cam groove 503, the circumferential portion and the deformed portion 503b appear alternately. The cam groove 503 is realized by one groove in which the circumferential portion 503a and the deforming portion 503b are alternately connected.

  The cam groove 503 in the optical filter switching mechanism 120 of this embodiment is not annular but is closed at both ends. The circumferential portion 503 a has a curved shape along the outer peripheral edge of the cam 203. The deformable portion 503b is provided so as to connect between the circumferential portions 503a, and has a shape that is bent into a generally U shape so that an intermediate position of the connecting portion with the circumferential portion 503a approaches the optical axis C. In this embodiment, the second cam can be realized by the cam groove 503.

  Next, the operation of the optical filter switching mechanism 120 according to the embodiment of the present invention will be described. FIGS. 8, 9, 10, 11, 12, 13, and 14 are explanatory diagrams showing each state that the optical filter switching mechanism 120 according to the embodiment of the present invention can take. 8, 9, 10, 11, 12, 13, and 14 show a state in which the optical filter switching mechanism 120 according to the embodiment of the present invention is viewed from the objective side in the optical axis direction. Yes.

  8, 9, 10, 11, 12, 13, and 14, the optical filter switching mechanism 120 according to the embodiment of the present invention sets the state shown in FIG. 8 as the first state. . In the first state, all three ND filters 302 are positioned at positions retracted from the optical path. Hereinafter, a state in which all three ND filters 302 are positioned at positions retracted from the optical path will be described as a first state.

  Of the three ND filters 302, the state in which the ND filter 302A is positioned on the optical path and the ND filters 302B and 302C are positioned at positions retracted from the optical path will be described as a second state. The state in which the ND filter 302B is positioned on the optical path and the ND filters 302A and 302C are positioned at positions retracted from the optical path among the three ND filters 302 will be described as a third state. Further, among the three ND filters 302, the state where the ND filter 302C is positioned on the optical path and the ND filters 302A and B are positioned at positions retracted from the optical path will be described as a fourth state.

  When shifting from the first state to the second state, the cam 203 in the state of FIG. 8 is rotated about the optical axis C in the clockwise direction in FIG. As the cam 203 rotates, the position where the slit 306A and the cam groove 503 intersect, that is, the cam pin 401A is guided by the deforming portion 503b and moves. Since the position of the base 202 with respect to the lens barrel 101 is fixed, the cam pin 401A moves on the arc formed by the slit 306A as the cam 203 rotates.

  As the cam 203 rotates, the cam pin 401 </ b> A moves in a direction approaching the optical axis C on the arc formed by the slit 306 </ b> A. The ND filter 302A moves with the cam pin 401A that moves in the direction approaching the optical axis C on the arc formed by the slit 306A, that is, the filter frame 201A, and moves in the direction that approaches the optical axis C.

  As described above, in the optical filter switching mechanism 120, when shifting from the first state (ie, the state shown in FIG. 8) to the second state (ie, the state shown in FIG. 10), each filter frame 201 and cam 203 is displaced from the state shown in FIG. 8 to the state shown in FIG. 10 through the state shown in FIG. In the optical filter switching mechanism 120 in this embodiment, the filter frame 201B (and the ND filter 302B) and the filter frame 201C (and the ND filter 302C) are used until the transition from the first state to the second state. Only the filter frame 201A (and the ND filter 302A) and the cam 203 are displaced without being displaced by the guidance of the circumferential portion 503a.

  When shifting from the second state to the third state, the cam 203 in the state of FIG. 10 is rotated about the optical axis C in the clockwise direction in FIG. As the cam 203 rotates, the position where the slit 306A and the cam groove 503 intersect, that is, the cam pin 401A is guided by the deforming portion 503b and moves. Further, when the cam 203 rotates, the position where the slit 306B and the cam groove 503 intersect, that is, the cam pin 401B is guided by the deforming portion 503b and moves.

  Since the position of the base 202 with respect to the lens barrel 101 is fixed, the cam pin 401A moves on the arc formed by the slit 306A with the rotation of the cam 203, and the cam pin 401B has the slit 306B with the rotation of the cam 203. Move on the formed arc. The cam pin 401A moves in a direction away from the optical axis C on the arc formed by the slit 306A as the cam 203 rotates. As the cam 203 rotates, the cam pin 401B moves on the arc formed by the slit 306B in a direction approaching the optical axis C.

  The movement of the cam pin 401A and the movement of the cam pin 401B are performed in parallel. Specifically, the cam pin 401B is slit along with the rotation of the cam 203 while the cam pin 401A moves in a direction away from the optical axis C on the arc formed by the slit 306A as the cam 203 rotates. It moves in a direction approaching the optical axis C on the arc formed by 306B. Thereby, in the optical filter switching mechanism 120, the ND filter 302B can be advanced on the optical path at the same time while the ND filter 302A is retracted from the optical path, and the ND filter 302B can be positioned on the optical path.

  As described above, in the optical filter switching mechanism 120, when the second state (ie, the state shown in FIG. 10) shifts to the third state (ie, the state shown in FIG. 12), each filter frame 201 and cam 203 is displaced from the state shown in FIG. 10 to the state shown in FIG. 12 through the state shown in FIG. In the optical filter switching mechanism 120 in this embodiment, the filter frame 201C (and the ND filter 302C) is displaced by the guidance of the circumferential portion 503a until the transition from the second state to the third state. Instead, only the filter frame 201A (and the ND filter 302A), the filter frame 201B (and the ND filter 302B), and the cam 203 are displaced.

  When shifting from the third state to the fourth state, the cam 203 in the state of FIG. 12 is rotated about the optical axis C in the clockwise direction in FIG. As the cam 203 rotates, the position where the slit 306B and the cam groove 503 intersect, that is, the cam pin 401B is guided by the deforming portion 503b and moves. Further, as the cam 203 rotates, the position where the slit 306C and the cam groove 503 intersect, that is, the cam pin 401C is guided by the deforming portion 503b and moves.

  Since the position of the base 202 with respect to the lens barrel 101 is fixed, the cam pin 401B moves on the arc formed by the slit 306B as the cam 203 rotates, and the cam pin 401C moves the slit 306C as the cam 203 rotates. Move on the formed arc. As the cam 203 rotates, the cam pin 401B moves in a direction away from the optical axis C on the arc formed by the slit 306B. The cam pin 401C moves on the arc formed by the slit 306C in a direction approaching the optical axis C as the cam 203 rotates.

  The movement of the cam pin 401B and the movement of the cam pin 401C are performed in parallel. Specifically, the cam pin 401C is slit along with the rotation of the cam 203 while the cam pin 401B moves in a direction away from the optical axis C on the arc formed by the slit 306B as the cam 203 rotates. It moves in a direction approaching the optical axis C on the arc formed by 306C. Accordingly, in the optical filter switching mechanism 120, the ND filter 302C can be advanced on the optical path at the same time while the ND filter 302B is retracted from the optical path.

  As described above, in the optical filter switching mechanism 120, when shifting from the third state (ie, the state shown in FIG. 12) to the fourth state (ie, the state shown in FIG. 14), each filter frame 201 and cam 203 is displaced from the state shown in FIG. 12 to the state shown in FIG. 14 through the state shown in FIG. In the optical filter switching mechanism 120 in this embodiment, the filter frame 201A (and the ND filter 302A) is displaced by the guidance of the circumferential portion 503a until the transition from the third state to the fourth state. Instead, only the filter frame 201B (and the ND filter 302B), the filter frame 201C (and the ND filter 302C), and the cam 203 are displaced.

  When shifting from the fourth state to the third state, the cam 203 in the state of FIG. 14 is rotated about the optical axis C counterclockwise in FIG. As the cam 203 rotates, the cam pin 401B moves in a direction approaching the optical axis C on the arc formed by the slit 306B. Further, as the cam 203 rotates, the cam pin 401C moves in a direction away from the optical axis C on an arc formed by the slit 306C.

  The movement of the cam pin 401B and the movement of the cam pin 401C are performed in parallel. Specifically, the cam pin 401C moves along the arc formed by the slit 306B as the cam 203 rotates while the cam pin 401B moves toward the optical axis C while the cam 203 rotates. Is moved in a direction away from the optical axis C. Accordingly, in the optical filter switching mechanism 120, the ND filter 302B can be advanced on the optical path at the same time while the ND filter 302C is retracted from the optical path.

  As described above, in the optical filter switching mechanism 120, when shifting from the fourth state (ie, the state shown in FIG. 14) to the third state (ie, the state shown in FIG. 12), each filter frame 201 and cam 203 is displaced from the state shown in FIG. 14 to the state shown in FIG. 12 through the state shown in FIG. In the optical filter switching mechanism 120 in this embodiment, the filter frame 201A (and the ND filter 302A) is displaced by the guidance of the circumferential portion 503a until the transition from the fourth state to the third state. Instead, only the filter frame 201B (and the ND filter 302B), the filter frame 201C (and the ND filter 302C), and the cam 203 are displaced.

  When shifting from the third state to the second state, the cam 203 in the state of FIG. 12 is rotated about the optical axis C in the counterclockwise direction in FIG. As the cam 203 rotates, the position where the slit 306A and the cam groove 503 intersect, that is, the cam pin 401A is guided by the deforming portion 503b and moves. Further, when the cam 203 rotates, the position where the slit 306B and the cam groove 503 intersect, that is, the cam pin 401B is guided by the deforming portion 503b and moves.

  Since the position of the base 202 with respect to the lens barrel 101 is fixed, the cam pin 401A moves on the arc formed by the slit 306A with the rotation of the cam 203, and the cam pin 401B has the slit 306B with the rotation of the cam 203. Move on the formed arc. As the cam 203 rotates, the cam pin 401 </ b> A moves in a direction approaching the optical axis C on the arc formed by the slit 306 </ b> A. As the cam 203 rotates, the cam pin 401B moves in a direction away from the optical axis C on the arc formed by the slit 306B.

  The movement of the cam pin 401A and the movement of the cam pin 401B are performed in parallel. Specifically, the cam pin 401B moves along the arc formed by the slit 306A in accordance with the rotation of the cam 203 while the cam pin 401A moves in a direction approaching the optical axis C. Is moved in a direction away from the optical axis C. Thereby, in the optical filter switching mechanism 120, the ND filter 302A can be advanced on the optical path at the same time while the ND filter 302B is retracted from the optical path.

  As described above, in the optical filter switching mechanism 120, when shifting from the third state (ie, the state shown in FIG. 12) to the second state (ie, the state shown in FIG. 10), each filter frame 201 and cam 203 is displaced from the state shown in FIG. 12 to the state shown in FIG. 10 through the state shown in FIG. In the optical filter switching mechanism 120 in this embodiment, the filter frame 201C (and the ND filter 302C) is displaced by the guidance of the circumferential portion 503a until the transition from the third state to the second state. Instead, only the filter frame 201A (and the ND filter 302A), the filter frame 201B (and the ND filter 302B), and the cam 203 are displaced.

  When shifting from the second state to the first state, the cam 203 in the state of FIG. 10 is rotated about the optical axis C counterclockwise in FIG. As the cam 203 rotates, the cam pin 401A moves in a direction away from the optical axis C on the arc formed by the slit 306A.

  As described above, in the optical filter switching mechanism 120, when shifting from the second state (ie, the state shown in FIG. 10) to the first state (ie, the state shown in FIG. 8), each filter frame 201 and cam 203 is displaced from the state shown in FIG. 10 to the state shown in FIG. 8 through the state shown in FIG. In the optical filter switching mechanism 120 in this embodiment, until the transition from the second state to the first state, the filter frame 201B (and the ND filter 302B) and the filter frame 201C (and the ND filter 302C) Only the filter frame 201A (and the ND filter 302A) and the cam 203 are displaced without being displaced by the guidance of the circumferential portion 503a.

  FIG. 15 is a timing chart showing the relationship between the rotation amount of the cam 203 and the operation of each ND filter 302A, 302B, 302C. In FIG. 15, when the cam 203 in the first state is rotated in the clockwise direction, the ND filter 302 positioned on the optical path is switched in the order of ND filter 302A → ND filter 302B → ND filter 302C.

  When switching from the ND filter 302A to the ND filter 302B or switching from the ND filter 302B to the ND filter 302C, the two filter frames 201 are displaced in parallel in the sections indicated by reference numerals 1501 and 1502 in FIG. ing. The section in which the two filter frames 201 are displaced in parallel is started after the ND filter 302 previously positioned on the optical path starts displacement in the direction of retracting from the optical path.

  That is, after the ND filter 302 previously positioned on the optical path starts to be displaced in the direction of retreating from the optical path, the ND filter 302 positioned on the optical path starts to be displaced. This can reliably prevent the filter frames 201 from contacting each other and damaging the filter frame 201, the ND filter 302, and the like. Since the two filter frames 201 are displaced in parallel, the dimension in the outer diameter direction of the filter switching mechanism 120 is moved from the mechanism that moves one filter frame 201 to the retracted position and then moves the other filter frame 201 to the optical path. Can be reduced.

  Next, the relationship between the filter frames 201 in the optical filter switching mechanism 120 according to the embodiment of the present invention will be described. 16 and 17 are explanatory diagrams showing the operation of the optical filter switching mechanism 120 according to the embodiment of the present invention. In FIG. 16, the optical filter switching mechanism 120 changes the position of each ND filter 302 with respect to the optical path from the no-filter state where the ND filter 302 is not positioned in the optical path to the first state, the second state, the third state, and the third state. An ND filter 302 (filter frame 201) that operates when sequentially changing to the fourth state is shown. In FIG. 17, when the optical filter switching mechanism 120 sequentially changes the position of each ND filter 302 relative to the optical path to a fourth state, a third state, a second state, a first state, and a no filter state. The ND filter 302 (filter frame 201) which operates in FIG.

  As shown in FIG. 16 and FIG. 17, in the state change between the second state and the third state, and the state change between the third state and the fourth state, two filter frames 201, Two ND filters 302 move in parallel. As a result, the optical filter switching mechanism 120 of this embodiment can quickly switch the ND filter 302 while suppressing damage to the filter frame 201 and the ND filter 302. Further, the optical filter switching mechanism 120 of this embodiment can realize an operation of switching a plurality of filters and preventing the filters from interfering with each other with a single cam 203.

  In the optical filter switching mechanism 120 of this embodiment, the filter portion does not protrude from the outer diameter of the lens barrel 101. Thereby, the product outer diameter of the lens barrel 101 can be reduced. In addition, since the filter frames 201 do not interfere with each other when moving, the filters do not overlap, and the size of the optical filter switching mechanism 120 in the optical axis direction can be reduced (that is, made thinner).

  As described above, the optical filter switching mechanism 120 of this embodiment has a plurality of filters attached to a plurality of holding members, the plurality of holding members arranged on the same plane, and a plurality of movable members and a fixed base member. A guide mechanism for freely moving the holding member between the open position and the retracted position is provided.

  As described above, the optical filter switching mechanism 120 (optical element switching device) of this embodiment includes a base 202 (fixed base member) having an opening 301 (an opening through which light of an object passes), and a base 202. On the other hand, the same number of cams 203 (rotating cam members) that are rotatably supported around the optical axis C and ND filters 302 (optical elements) are provided on the same plane orthogonal to the optical axis C, and Each of the filter frames 201 is supported by the base 202 so as to be rotatable about one end portion as a support shaft. A guide mechanism that is movably guided between a position overlapping the opening 301 and each retreat position retracted from the opening 301 so as not to interfere with each other; It is characterized by comprising a.

  According to the optical filter switching mechanism 120 of this embodiment, a plurality of ND filters 302 are positioned at the same position in the optical axis direction, and all ND filters 302 and filter frames 201 are mirrors regardless of the position of the ND filter 302 with respect to the optical path. Since it is configured so as not to protrude beyond the outer diameter side of the outer diameter of the tube 101, a desired optical element of the plurality of optical elements is suppressed while suppressing an increase in the size of the lens barrel 101 in the outer diameter direction and the optical axis direction. Can be selectively positioned on the optical path.

  Further, in the optical filter switching mechanism 120 according to this embodiment, the guide mechanism includes a cam pin 401 provided in the holding member, a slit 306 (first cam) provided in the fixed base member that is fitted to the cam pin 401, and A cam groove 503 (second cam) provided in the cam 203 and fitted with the cam pin 401, and the slit 306 is formed by an arc portion whose distance to one end of the filter frame 201 is always constant, The cam groove 503 is formed by a circumferential portion 503a whose distance to the optical axis C is always constant and a deforming portion 503b whose distance to the optical axis C changes, and the cam 203 is centered on the optical axis C. When rotated to a first predetermined angle, one ND filter 302 (for example, ND filter 302A) is positioned in the opening 301, and the ND filter 30 A cam pin 401 (for example, cam pin 401A) corresponding to A is positioned at a position closest to the optical axis C in the deformable portion 503b, the other ND filters 302 (for example, ND filters 302B and 302C) are positioned at a retracted position, and others The cam pins 401 (401B, 401C) corresponding to the ND filter 302 (for example, the ND filters 302B, 302C) are positioned on the circumferential portion 503a.

  According to the optical filter switching mechanism 120 of this embodiment, with a simple configuration, while suppressing an increase in the size of the lens barrel 101 in the outer diameter direction and the optical axis direction, a plurality of ND filters 302 (ND filters 302A, 302B, 302C), a desired ND filter 302 (eg, ND filter 302A) can be selectively positioned on the optical path.

  Further, in the optical filter switching mechanism 120 of this embodiment, the deforming portion 503b is different from the first angle at which the first deforming portion forms a first angle with respect to the circumferential direction around the optical axis. When the cam 203 is rotated to a first predetermined angle, at least one cam pin 401 (for example, the cam pin 401A) is connected to the first deformable portion and the second deformable portion. It is characterized by being positioned at a first connecting portion with the deforming portion or a second connecting portion between the deforming portion 503b and the circumferential portion 503a.

  Alternatively, in the optical filter switching mechanism 120 of this embodiment, the deforming portion 503b is different from the first deforming portion, which is at a first angle with respect to the circumferential direction around the optical axis. When the cam 203 is rotated to the second predetermined angle, all the ND filters 302 are positioned at the retracted position, and the cam 203 is moved to the first predetermined portion. When rotated to an angle or a second predetermined angle, at least one cam pin 401 (for example, the cam pin 401A) is connected to the first connecting portion or the deforming portion between the first deforming portion and the second deforming portion. It may be characterized in that it is positioned at the second connecting portion with the circumferential portion.

  As described above, according to the optical filter switching mechanism 120 of this embodiment, the cam 203 is rotated to each predetermined angle (0 [deg], 48 [deg], 96 [deg], 144 [deg]). In this case, it is possible to draw a click feeling (holding force) at each predetermined rotation angle position. Thereby, the operability of the optical filter switching mechanism 120 can be improved.

  Further, the optical filter switching mechanism 120 of this embodiment is characterized in that the base 202 is disposed between the filter frame 201 and the cam 203. According to the optical filter switching mechanism 120 of this embodiment, the filter frame 201 and the cam 203 can be operated with reference to the base 202 fixed to the lens barrel 101. Thereby, the operation accuracy of the filter frame 201 and the cam 203 can be improved.

  Instead of the configuration of the optical filter switching mechanism 120 of this embodiment, the filter frame 201 may be disposed between the base 202 and the cam 203. Accordingly, the position of the filter frame 201 can be regulated between the base 202 and the cam 203, so that the filter frame 201 can be prevented from falling off with a simple configuration without increasing the number of parts.

  Further, in the optical filter switching mechanism 120 according to this embodiment, the cam 203 protrudes in a substantially optical axis direction from a surface facing the cam 203 and includes a substantially L-shaped protrusion. The cam 203 is attached in a bayonet form to the protrusion, and the surface of the cam 203 that is not opposed to the base 202 is the same in the optical axis direction as the surface perpendicular to the optical axis of the protrusion. It is characterized by being provided at a position.

  According to the optical filter switching mechanism 120 of this embodiment, the fixing member 204 and the screw 205 can be eliminated with a simple configuration, and the size of the lens barrel 101 in the optical axis direction can be increased compared to the first embodiment. While suppressing, a desired ND filter 302 (for example, ND filter 302A) of the plurality of ND filters 302 (ND filters 302A, 302B, and 302C) can be selectively positioned on the optical path.

  Further, the optical filter switching mechanism 120 of this embodiment is characterized in that the optical element is an ND filter 302. According to the optical filter switching mechanism 120 of this embodiment, a desired optical element among a plurality of optical elements is selectively placed on the optical path while suppressing an increase in the size of the lens barrel 101 in the outer diameter direction and the optical axis direction. Therefore, it is possible to switch the density in a plurality of stages.

  In the optical filter switching mechanism 120 of this embodiment, the optical element is realized by the ND filter 302, but the optical element is not limited to that realized by the ND filter 302. Specifically, for example, instead of the ND filter 302, it may be used as an optical element such as an infrared cut filter for removing infrared rays in outside light.

  In addition, the lens device of this embodiment includes the optical element switching device 120 described above, and the rotating cam member and the fixed base member have a substantially disk shape centered on the optical axis, and are outside the rotating cam member. The diameter is smaller than the outer diameter of the fixed base member, is provided between the outer periphery of the lens barrel and the rotating cam member, and is positioned so as to be stacked with the rotating cam member along the direction orthogonal to the optical axis. It is characterized by having another member provided.

  According to the lens barrel 101 provided with the optical filter switching mechanism 120 of this embodiment, the space between the outer peripheral portion of the barrel 101 and the cam 203 is fully utilized, and another member (a pole or a motor head portion) is used. And the like, while suppressing an increase in size of the lens barrel 101 in the optical axis direction, a desired ND filter 302 (e.g., ND filter 302A) of the plurality of ND filters 302 (ND filters 302A, 302B, and 302C). ) Can be selectively positioned on the optical path.

  As described above, the optical element switching device according to the present invention includes a plurality of optical elements such as a plurality of ND filters having different densities, and selectively selects a desired optical element from the plurality of optical elements. It is useful for an optical element switching device that switches an optical element positioned in an optical path as appropriate, and is particularly suitable for an optical element switching device that requires a reduction in thickness.

DESCRIPTION OF SYMBOLS 100 Lens apparatus 101 Lens barrel 120 Optical filter switching mechanism 201 Filter frame 202 Base 203 Cam 302 ND filter 306 Slit 401 Cam pin 503 Cam groove

Claims (9)

A fixed base member having an opening through which the light of the subject passes;
A rotating cam member supported to be rotatable about an optical axis with respect to the fixed base member;
A plurality of optical elements are provided on the same plane orthogonal to the optical axis, and each of the optical elements is supported by the fixed base member so as to be rotatable about one end portion as a support shaft, and each holds the optical elements. A holding member of
A guide mechanism that is movably guided between the opening and each retracted position so that the plurality of holding members do not interfere with each other by the rotation of the rotating cam member;
An optical element switching device comprising: The guide mechanism is
A cam pin provided on the holding member;
A first cam fitted to the cam pin and provided on the fixed base member;
A second cam fitted to the cam pin and provided on the rotating cam member;
With
The first cam is formed by an arc portion whose distance to one end of the holding member is always constant,
The second cam is formed by a circumferential portion in which the distance to the optical axis is always constant, and a deformation portion in which the distance to the optical axis changes,
When the rotating cam member is rotated to a first predetermined angle, one of the optical elements is positioned at the opening, and the cam pin corresponding to the optical element is positioned at the deformation portion. 2. The optical pin is positioned near the optical axis, the other optical elements are positioned at the retracted position, and the cam pins corresponding to the other optical elements are positioned at the circumferential portion. The optical element switching device according to 1. The deformation portion is formed by a first deformation portion that forms a first angle with respect to a circumferential direction around the optical axis, and a second deformation portion that forms an angle different from the first angle,
When the rotating cam member is rotated to the first predetermined angle, at least one of the cam pins is connected to the first connecting portion between the first deforming portion and the second deforming portion, or the The optical element switching device according to claim 2, wherein the optical element switching device is positioned at a second connecting portion between the deforming portion and the circumferential portion. The deformation portion is formed by a first deformation portion that forms a first angle with respect to a circumferential direction around the optical axis, and a second deformation portion that forms an angle different from the first angle,
When the rotating cam member is rotated to a second predetermined angle, all the optical elements are positioned at the retracted position,
When the rotating cam member is rotated to the first predetermined angle or the second predetermined angle, at least one of the cam pins is moved between the first deformable portion and the second deformable portion. 3. The optical element switching device according to claim 2, wherein the optical element switching device is positioned at a first connection portion or a second connection portion between the deformation portion and the circumferential portion.   The optical element switching device according to claim 1, wherein the holding member is disposed between the fixed base member and the rotating cam member.   The optical element switching device according to claim 1, wherein the fixed base member is disposed between the holding member and the rotating cam member. The fixed base member protrudes in a substantially optical axis direction from a surface facing the rotating cam member, and includes a projecting portion having a substantially L shape.
The protrusion or the rotating cam member is formed by an elastic member,
The rotating cam member is attached to the protrusion in a bayonet form,
The optical device according to claim 6, wherein a surface of the rotating cam member that does not face the fixed base member is provided at the same position in the optical axis direction as a surface that is substantially orthogonal to the optical axis of the protrusion. Element switching device.   The optical element switching device according to claim 1, wherein the optical element is a filter. A lens barrel comprising the optical element switching device according to any one of claims 1 to 8,
The rotating cam member and the fixed base member have a substantially disc shape centered on the optical axis,
An outer diameter of the rotating cam member is formed smaller than an outer diameter of the fixed base member;
A separate member is provided between the outer periphery of the lens barrel and the rotating cam member, and is provided at a position where the rotating cam member is stacked along a direction orthogonal to the optical axis. Lens barrel to be used.

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