JP2010032831A - Optical filter holding mechanism, lens device and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress degradation of optical performance caused by backlash of an optical filter relative to an optical path. <P>SOLUTION: The optical filter holding mechanism includes: an optical filter 211 arranged on the optical path; a filter holding frame 212 holding the optical filter 211; a mount member 213 supporting the filter holding frame 212; and a backlash preventing member 214 as an example of a biasing member which applies a biasing force for pressing the optical filter 211 against the filter holding frame 212 between the optical filter 211 and the mount member 213. By biasing the optical filter 211, the filter holding frame 212 holding the optical filter 211 is biased together with the optical filter 211, thereby fixing the positions of the optical filter 211 and the filter holding frame 212 relative to the mount member 213. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical filter holding mechanism including an optical filter that adjusts optical performance, a lens device including the optical filter holding mechanism, and an imaging device including the lens device.

  In recent years, there has been a strong demand for downsizing an imaging apparatus such as a digital camera, and with the downsizing of an imaging apparatus, there is an increasing need for downsizing of a lens device mounted on the imaging apparatus. Some lens devices included in an imaging device include an optical filter that adjusts the optical performance of light passing through the lens device. Specific examples of the optical filter include an IR cut filter that blocks passage of infrared rays. An optical filter such as an IR cut filter is held by, for example, a filter holding frame supported by a predetermined mount member. The size of the optical filter needs to be reduced as the lens apparatus becomes smaller.

  Conventionally, for example, by fixing an optical filter to a filter holding member that holds the optical filter with an adhesive, an optical filter in a radial direction of a circle centered on the optical axis (hereinafter referred to as “the outer peripheral direction of the optical filter”). There has been a technique for preventing the play of the optical filter and the play of the optical filter in the optical axis direction (thrust direction). By preventing the optical filter from rattling in the outer peripheral direction and the optical axis direction (thrust direction) of the optical filter, the effective range of the optical filter can be reliably positioned on the optical path of the lens device.

  Further, conventionally, for example, by utilizing the elasticity of the claw member provided on the filter holding frame, the claw member is engaged with the end of the optical filter so that the optical filter is fixed to the filter holding frame by the claw member. (See, for example, Patent Documents 1, 2, and 3 below). In such a conventional technique, the optical filter is fixed to the filter holding frame by elastically deforming the claw member using the elasticity of the resin material used for molding the filter holding frame.

Japanese Patent Laying-Open No. 2005-309051 JP 2002-281400 A JP 2002-189158 A

  However, in the conventional technique described above, the position of the optical filter with respect to the filter holding frame can be fixed by attaching the optical filter to the filter holding frame, but the play of the filter holding frame with respect to a predetermined mounting member has occurred. In this case, simply fixing the position of the optical filter with respect to the filter holding frame cannot fix the position of the optical filter with respect to the optical path, and the effective range of the optical filter deviates from the optical path of the lens apparatus, and the lens apparatus or the There has been a problem in that the optical performance of an imaging device equipped with a lens device is degraded.

  Further, when the optical filter is attached to the filter holding frame using an adhesive as in the conventional technique described above, it is possible to prevent the optical filter from rattling in the outer peripheral direction and the optical axis direction (thrust direction) of the optical filter. However, there is a problem that the number of work steps is increased as compared with the case where the optical filter is attached to the filter holding frame using the claws. Also, for example, when attaching an optical filter to the filter holding frame using an adhesive, the flexibility during assembly is low, and once the optical filter is attached to the filter holding frame, the mounting position is adjusted or the mounting operation is repeated. There was a problem that could not be.

  In addition, when the optical filter is fixed using a claw member provided on the filter holding frame as in the conventional technique described above, the filter holding frame tends to be large in order to ensure sufficient strength in the filter holding frame. There is. For this reason, the lens device provided with such a filter holding frame or the imaging device provided with the lens device is increased in size, and there is a problem that it is difficult to reduce the size of the lens device and the imaging device. Further, when the claw member for fixing the optical filter is integrally formed with the filter holding frame, the structure of the filter holding frame becomes complicated and large, and the manufacture of the filter holding frame becomes complicated, which makes the manufacture of the filter holding frame. There was a problem that this cost would increase.

  In order to eliminate the above-described problems caused by the prior art, the optical filter holding mechanism capable of suppressing a decrease in optical performance due to the play of the optical filter with respect to the optical path, and the optical held by the optical filter holding mechanism. It is an object of the present invention to provide a lens device including a filter and an imaging device including the lens device.

  The present invention also provides an optical filter holding mechanism that can suppress a decrease in optical performance caused by the play of the optical filter with respect to the optical path without increasing the size or the structure, and the optical filter holding mechanism holds the optical filter. It is an object to provide a lens device including an optical filter and an imaging device including the lens device.

  In order to solve the above-described problems and achieve the object, an optical filter holding mechanism according to the present invention supports an optical filter disposed on an optical path, a filter holding frame for holding the optical filter, and the filter holding frame. And a biasing member that applies a biasing force that presses the optical filter against the filter holding frame between the optical filter and the support member.

  According to this invention, by energizing the optical filter, it is possible to energize the filter holding frame that holds the optical filter together with the optical filter, thereby fixing the position of the optical filter and the filter holding frame with respect to the support member. can do. Thereby, the play of the optical filter with respect to the optical path can be prevented by a simple configuration and an easy operation of providing an urging member between the optical filter and the support member.

  The optical filter holding mechanism according to the present invention is the optical filter holding mechanism according to the above invention, wherein the biasing member is curved or bent so that an elastic member having a predetermined elasticity protrudes along the biasing direction of the biasing member. It is characterized in that it is provided such that a part that is formed by bending is in contact with the support member and another part is in contact with the optical filter.

  According to this invention, a curved or bent part of an elastic member having a predetermined elasticity is deformed between the support member and the optical filter, and the optical filter is pressed against the filter holding frame by the restoring force generated by the deformation. Power can be applied. Thus, the biasing member realized by a simple configuration of bending or bending the elastic member can prevent the optical filter from rattling with respect to the optical path.

  The optical filter holding mechanism according to the present invention is the optical filter holding mechanism according to the present invention, wherein the biasing member protrudes along at least one direction in an arbitrary direction and an optical axis direction in a plane intersecting the optical axis. It is formed by bending or bending. According to the present invention, rattling of the optical filter with respect to the optical path is prevented by the biasing member realized by a simple configuration in any one direction within the plane intersecting the optical axis and at least one of the optical axis directions. be able to.

  Further, according to the present invention, particularly when the urging member is formed by bending or bending so as to protrude along any one direction and the optical axis direction in a plane intersecting the optical axis, respectively. In any one direction in the plane intersecting the optical axis and in two directions of the optical axis direction, the optical filter can be prevented from rattling with respect to the optical path by using a biasing member realized by a simple configuration.

  The optical filter holding mechanism according to the present invention is characterized in that, in the above invention, the urging member is formed by bending or bending a wire-like member having a predetermined diameter. According to the present invention, the biasing member can be realized with an easy and simple configuration.

  The lens device according to the present invention includes an optical filter disposed on an optical path, a filter holding frame that holds the optical filter, a support member that supports the filter holding frame, the optical filter, and the support member. A biasing member that applies a biasing force that presses the optical filter against the filter holding frame, and a lens that is provided on the optical path and that allows external light to enter the optical filter. And According to the present invention, it is possible to obtain a lens device that exhibits stable optical performance by preventing the optical filter from rattling with respect to the optical path.

  According to another aspect of the present invention, there is provided an image pickup apparatus comprising: a photoelectric conversion element for image pickup; and the above-described lens device that causes external light to enter the photoelectric conversion element. According to the present invention, it is possible to obtain an imaging device that exhibits stable optical performance by preventing the optical filter from rattling with respect to the optical path.

  According to the optical filter holding mechanism, the lens device, and the imaging device according to the present invention, it is possible to prevent the optical filter from rattling with respect to the optical path. Accordingly, it is possible to suppress a decrease in optical performance due to the play of the optical filter with respect to the optical path.

  Exemplary embodiments of an optical filter holding mechanism, a lens apparatus, and an imaging apparatus according to the present invention will be explained below in detail with reference to the accompanying drawings.

(Embodiment 1)
First, the lens apparatus of Embodiment 1 according to the present invention will be described. 1, 2 and 3 are explanatory views showing the lens apparatus according to the first embodiment of the present invention. FIG. 1 shows a perspective view of the lens apparatus according to the first embodiment of the present invention as viewed from the objective side. FIG. 2 shows a perspective state in which the lens apparatus according to the first embodiment of the present invention is disassembled and viewed from the objective side. FIG. 3 shows a cross section of the lens apparatus according to the first embodiment of the present invention, cut along a plane passing through the optical axis and parallel to the optical axis.

  1, 2, and 3, the lens apparatus 100 according to the first embodiment of the present invention includes a lens barrel 101. The lens barrel 101 has a substantially cylindrical shape, and is provided at the end portions on the eyepiece side and the object side, and has an opening that opens the inside of the lens barrel 101 to the outside. Reference numeral 201 in FIG. 2 indicates an opening provided on the objective side among the two openings provided at the end portions on the eyepiece side and the objective side. The lens barrel 101 has, for example, a rectangular tube shape. In addition, the lens barrel 101 may have a cylindrical shape, for example. The lens barrel 101 is attached to the imaging apparatus main body in a state where an opening provided at an end portion on the eyepiece side is opposed to the imaging apparatus main body (not shown).

  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 device can be realized by a solid-state imaging device such as a CCD image sensor (Charge Coupled Device Image Sensor) or a CMOS (Complementary Metal Oxide Semiconductor) image sensor.

  A lens frame 102 having a lens 301 is attached to the opening 201 or in the vicinity of the opening 201. A lens frame 202 including a lens 302 and a lens frame 203 including a lens 303 are provided on the inner peripheral side of the lens barrel 101. The lens frames 102, 202, and 203 are arranged in the order of the lens frame 102, the lens frame 202, and the lens frame 203 in this order from the objective side along the optical axis direction. The outer peripheral portions of the lens frames 102, 202, and 203 are in contact with or close to the inner peripheral surface of the lens barrel 101 so as to block the passage of light at locations other than the lenses 301, 302, and 303, respectively.

  An IRIS unit 204 is provided between the lens frame 202 and the lens frame 203 on the inner peripheral side of the lens barrel 101. The IRIS unit 204 includes an aperture opening forming part 204a and an iris motor 204b. The aperture opening forming unit 204a includes a plurality of aperture blades (not shown) that form aperture apertures. The aperture opening forming unit 204a includes, for example, two aperture blades, adjusts the size of the aperture aperture by sliding the aperture blades in opposite directions, and adjusts the amount of light passing through the IRIS unit 204. be able to.

  The iris motor 204b generates a driving force that moves the two diaphragm blades in opposite directions. The IRIS unit 204 drives the iris motor 204b according to the amount of light incident into the lens barrel 101 to slide the diaphragm blades, thereby changing the aperture diameter of the aperture opening in the aperture opening forming part 204a. The IRIS unit 204 may be configured to include a plate-like member having an aperture opening with a fixed aperture diameter instead of a plurality of aperture blades.

  On the inner peripheral side of the lens barrel 101, an optical filter holding mechanism 210 is provided on the eyepiece side of the lens frame 203. The optical filter holding mechanism 210 includes an optical filter 211. Specifically, for example, an IR cut filter or the like can be used as the optical filter 211. The IR cut filter transmits visible light and absorbs infrared light. The optical filter holding mechanism 210 includes a filter holding frame 212 that holds the optical filter 211 and a mount member 213 that supports the filter holding frame 212. In the first embodiment, the support member can be realized by the mount member 213.

  In this embodiment, the support member that supports the filter holding frame 212 by the mount member 213 is realized. However, the present invention is not limited to this. For example, if the filter holding frame 212 is supported by the lens barrel 101, the support member can be realized by the lens barrel 101. Further, in a lens barrel configured by connecting a plurality of cylindrical members along the optical axis direction, such as a lens barrel used in a zoom lens device, for example, with respect to the imaging device main body during zoom adjustment If the lens device has a structure in which the filter holding frame 212 is supported by a fixed cylinder that is not displaced, the support member can be realized by the fixed cylinder.

  In addition, if the structure is such that the filter holding frame 212 is supported by a lens frame that holds the lens, such as the lens frame 102, the lens frame 202, and the lens frame 203, the support member can be realized by the corresponding lens frame. . The filter holding frame 212 may be held by, for example, the IRIS unit 204. In this case, a support member can be realized by the IRIS unit 204. The member that realizes the support member is not limited to the above, and the support member may be realized by other members included in the lens device.

  Further, the optical filter holding mechanism 210 includes a backlash preventing member 214 for preventing the backlash of the optical filter 211. In the first embodiment, the urging member can be realized by the rattling prevention member 214. The filter holding frame 212, the mount member 213, and the rattling prevention member 214 will be described later.

  4, 5 and 6 are explanatory views showing the optical filter holding mechanism 210 according to the first embodiment of the present invention. FIG. 4 shows a perspective state of the optical filter holding mechanism 210 according to the first embodiment of the present invention as viewed from the objective side. FIG. 5 shows a perspective state of the optical filter holding mechanism 210 according to the first embodiment of the present invention as seen from the object side after being disassembled. In FIG. 6, the top view which looked at the optical filter holding mechanism 210 of Embodiment 1 concerning this invention from the objective side is shown.

  4, 5, and 6, the optical filter 211 is attached to the filter holding frame 212 by an optical filter guide member 401 provided in the filter holding frame 212. The optical filter guide member 401 is provided on a filter holding frame main body 501 having a substantially flat plate shape. The filter holding frame main body 501 includes an opening 502 through which light incident on the optical filter holding mechanism 210 passes.

  The optical filter guide member 401 has a shape that protrudes from the filter holding frame main body 501 on the outer peripheral side of the opening 502 and has a bent end so as to cover the end of the optical filter 211. The optical filter guide member 401 is disposed to face the optical filter 211 in the plane orthogonal to the optical axis. The tip of the optical filter guide member 401 is bent toward the optical filter guide members 401 facing each other, that is, toward the opening 502 side.

  The filter holding frame 212 includes an optical filter restricting member 503 that determines the position of the optical filter 211 with respect to the filter holding frame main body 501. The optical filter restricting member 503 is provided at a position in the filter holding frame main body 501 that is in contact with the optical filter 211 that slides between the optical filter guide members 401 while being guided by the optical filter guide member 401. The optical filter restricting member 503 is in contact with one end of the optical filter 211 that slides between the optical filter guide members 401 to fix the position of the end of the optical filter 211, so that the optical filter 211 with respect to the filter holding frame body 501 is fixed. The position of can be determined.

  The filter holding frame 212 is attached to the mount member 213 by a filter holding frame guide member 504 provided in the mount member 213. The filter holding frame guide member 504 is provided on the mount member main body 505 having a substantially flat plate shape. The mount member main body 505 includes an opening 506 through which light incident on the optical filter holding mechanism 210 passes. The filter holding frame guide member 504 is provided so as to protrude from the mount member main body 505 on the outer peripheral side of the opening 506.

  The filter holding frame guide member 504 faces in a direction perpendicular to the facing direction of the optical filter guide member 401 in a plane perpendicular to the optical axis. Thereby, the insertion direction of the optical filter 211 with respect to the filter holding frame 212 and the sliding movement direction of the filter holding frame 212 between the filter holding frame guide members 504 can be made different. That is, the movement of the optical filter 211 in the vertical direction of the paper surface in FIG. 4 is suppressed by the optical filter guide member 401, and the sliding movement of the filter holding frame 212 in the horizontal direction of the paper surface in FIG. 4 is suppressed by the filter holding frame guide member 504. Can do.

  The mount member 213 includes a filter holding frame regulating member 507 that determines the position of the filter holding frame 212 with respect to the mount member main body 505. The filter holding frame restricting member 507 is provided in the mount member main body 505 at a position where it abuts on the filter holding frame 212 that slides between the filter holding frame guide members 504 while being guided by the filter holding frame guide member 504. . The filter holding frame restricting member 507 is in contact with one end of the filter holding frame 212 that slides between the filter holding frame guide members 504 and fixes the position of the end of the filter holding frame 212, so that the mount member main body 505 is fixed. The position of the filter holding frame 212 can be determined.

  The rattling prevention member 214 is provided between the optical filter 211 held by the filter holding frame 212 and the filter holding frame guide member 504 in the mount member 213 in a plane orthogonal to the optical axis. Specifically, the rattling prevention member 214 includes an end portion of the optical filter 211 opposite to the optical filter regulating member 503 and a filter holding frame guide member provided on the end portion side in a plane orthogonal to the optical axis. 504.

  The rattle prevention member 214 has a corrugated shape in which a wire-like member made of a metal material is bent so as to contact the optical filter and the filter holding frame guide member 504. Specifically, the rattling prevention member 214 is disposed on the optical filter 211 side and on the filter holding side so as to alternately contact the optical filter 211 and the filter holding frame guide member 504 in the insertion direction of the filter holding frame 212 with respect to the mount member 213. The frame guide member 504 has a shape protruding alternately in a waveform.

  In the first embodiment, the optical filter 211 is brought into contact with the optical filter 211 at two locations, and the filter holding frame guide member 504 is brought into contact with the optical filter 211 in the insertion direction of the filter holding frame 212 with respect to the mount member 213. It has a corrugated shape projecting at two locations toward the optical filter 211 and at one location toward the filter holding frame guide member 504 so as to come into contact with each other.

  The bent portions projecting toward the optical filter 211 side and the filter holding frame guide member 504 side have shapes that are inclined with respect to the insertion direction of the filter holding frame 212 with respect to the mount member 213 in a plane orthogonal to the optical axis. There is no. Specifically, for example, the bent portion protruding toward the optical filter 211 side and the filter holding frame guide member 504 side is in the insertion direction of the filter holding frame 212 with respect to the mount member 213 in a plane perpendicular to the optical axis. They are inclined at angles θ1 and θ2, respectively. The angles θ1 and θ2 may be arbitrarily set when the lens apparatus 100 is designed.

  Both ends of the rattling prevention member 214 are inserted into holes 508 provided in the optical filter guide member 401, whereby the position of the rattling prevention member 214 with respect to the filter holding frame 212 is fixed. The hole 508 has a substantially circular shape that penetrates the optical filter guide member 401 in the insertion direction of the filter holding frame 212 with respect to the mount member 213. The opening diameter of the hole 508 is preferably equal to or larger than the diameter of the wire-like member constituting the rattling prevention member 214. Alternatively, the hole 508 may have a width that is the same as the diameter of the wire-like member, and may have an elongated hole shape with the sliding direction of the optical filter 211 relative to the filter holding frame 212 as the longitudinal direction.

  Further, the hole 508 is not limited to a shape penetrating the optical filter guide member 401 in the insertion direction of the filter holding frame 212 with respect to the mount member 213, and is caught by both end portions of the rattling prevention member 214, so The shape may be recessed so that the position relative to the filter guide member 401 can be fixed. The rattling prevention member 214 is fitted to the holes 508 at both ends so that the gap between the optical filter 211 and the filter holding frame guide member 504 is widened with reference to the positions of both ends. The member 504 is biased.

  At this time, the bent portion of the rattle prevention member 214 is inclined at angles θ1 and θ2 with respect to the insertion direction of the filter holding frame 212 with respect to the mount member 213 in the plane orthogonal to the optical axis. Even when there is a variation in the distance between the optical filter 211 and the filter holding frame guide member 504 due to variations in the manufacturing accuracy of the filter holding frame 212 and the mount member 213, there is a difference between the optical filter 211 and the filter holding frame guide member 504. Thus, the rattling prevention member 214 can be freely elastically deformed, and the optical filter 211 and the filter holding frame guide member 504 can be reliably urged.

  In the first embodiment, the rattling prevention member 214 has a wavy shape that protrudes at two locations toward the optical filter 211 side and at one location toward the filter holding frame guide member 504 side. The shape of the prevention member 214 is not limited to this. The number protruding toward the optical filter 211 and the number protruding toward the filter holding frame guide member 504 may be arbitrary numbers.

  FIG. 7 is an explanatory view showing another shape of the rattling-preventing member according to the first embodiment of the present invention. In FIG. 7, another rattling prevention member 700 having a shape has a corrugated shape projecting at two locations toward the optical filter 211 side and projecting at two locations toward the filter holding frame guide member 504 side. The anti-rattle member 700 having another shape protrudes at two locations toward the filter holding frame guide member 504 between two bent portions protruding toward the optical filter 211 side.

  Even in another shape of the anti-rattle member 700, the bent portions are inclined at angles θ3 and θ4 with respect to the insertion direction of the filter holding frame 212 with respect to the mount member 213 in the plane orthogonal to the optical axis, respectively. . Thus, for example, even when the distance between the optical filter 211 and the filter holding frame guide member 504 varies due to variations in the manufacturing accuracy of the filter holding frame 212 and the mount member 213, the optical filter 211 and the filter holding frame guide. The rattling prevention member 214 can be freely elastically deformed between the members 504, and the optical filter 211 and the filter holding frame guide member 504 can be reliably urged.

  As described above, according to the optical filter holding mechanism 210 of the first embodiment, the optical filter 211 disposed on the optical path, the filter holding frame 212 that holds the optical filter 211, and the filter holding frame 212 are supported. And a rattling prevention member 214 as an example of a biasing member that applies a biasing force that presses the optical filter 211 against the filter holding frame 212 between the optical filter 211 and the mount member 213. Therefore, by energizing the optical filter 211, the filter holding frame 212 that holds the optical filter 211 can be energized together with the optical filter 211, so that the optical filter 211 and the filter holding frame 212 can be energized. The position with respect to the mount member 213 can be fixed.

  Thus, rattling of the optical filter 211 with respect to the optical path can be prevented by a simple configuration and easy work of providing the rattling prevention member 214 between the optical filter 211 and the mount member 213. Further, by preventing the optical filter 211 from rattling with respect to the optical path, it is possible to suppress a decrease in optical performance due to the rattling of the optical filter 211 with respect to the optical path.

  Further, according to the optical filter holding mechanism 210 of the first embodiment, the rattling prevention member 214 as an example of the biasing member changes the elastic member having a predetermined elasticity in the biasing direction by the rattling prevention member 214. Since it is formed by bending so as to protrude along, and a part of the bent is in contact with the mount member 213 and another part is in contact with the optical filter 211, A part of the elastic member having a predetermined elasticity is deformed between the mount member 213 and the optical filter 211, and a biasing force that presses the optical filter 211 against the filter holding frame 212 is applied by a restoring force generated by the deformation. be able to.

  As described above, the rattling prevention member 214 realized by a simple configuration of bending the elastic member does not increase the size of the optical filter holding mechanism 210, and the optical filter 211 with respect to the optical path can be easily operated with a simple configuration. It is possible to prevent rattling. Further, by preventing the optical filter 211 from rattling with respect to the optical path, it is possible to suppress a decrease in optical performance due to the rattling of the optical filter 211 with respect to the optical path.

  Further, according to the optical filter holding mechanism 210 of the first embodiment, the rattling prevention member 214 is bent so as to protrude along the direction orthogonal to the optical axis in a plane intersecting the optical axis. Therefore, the play of the optical filter 211 with respect to the optical path in the direction perpendicular to the optical axis can be prevented by the play preventing member 214 realized by a simple configuration. Further, by preventing the optical filter 211 from rattling with respect to the optical path, it is possible to suppress a decrease in optical performance due to the rattling of the optical filter 211 with respect to the optical path.

  Further, according to the optical filter holding mechanism 210 of the first embodiment, the rattling prevention member 214 is formed by bending a wire-like member having a predetermined diameter, and thus the rattling prevention member 214 is provided. The member 214 can be realized with an easy and simple configuration. In this way, by preventing the play of the optical filter 211 with respect to the optical path with an easy and simple configuration, a decrease in the optical performance due to the play of the optical filter 211 with respect to the optical path is suppressed with an easy and simple configuration. be able to.

  The lens device 100 according to the present invention includes an optical filter 211 disposed on the optical path, a filter holding frame 212 that holds the optical filter 211, a mount member 213 that supports the filter holding frame 212, and an optical filter 211. A backlash preventing member 214 as an example of a biasing member that applies a biasing force to press the optical filter 211 against the filter holding frame 212 between the mount member 213 and the optical filter 211 is provided on the optical path. The lens device 100 that exhibits stable optical performance can be obtained by preventing the optical filter 211 from rattling with respect to the optical path.

  In addition, since the imaging apparatus according to the present invention includes the photoelectric conversion element for imaging and the lens device 100 that causes external light to enter the photoelectric conversion element, the optical filter 211 has a backlash with respect to the optical path. By preventing this, it is possible to obtain an imaging device that exhibits stable optical performance.

(Embodiment 2)
Next, the optical filter holding mechanism 210 according to the second embodiment of the present invention will be described. In the second embodiment according to the present invention, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. 8, FIG. 9 and FIG. 10 are explanatory views showing the optical filter holding mechanism according to the second embodiment of the present invention. FIG. 8 shows a perspective view of the optical filter holding mechanism according to the second embodiment of the present invention as viewed from the objective side. FIG. 9 shows a perspective view of the optical filter holding mechanism according to the second embodiment of the present invention as seen from the exploded side. In FIG. 10, the top view which looked at the optical filter holding mechanism of Embodiment 2 concerning this invention from the objective side is shown.

  8, 9, and 10, the optical filter holding mechanism 800 according to the second embodiment of the present invention has the optical filter 211 attached to the filter holding frame 801 by the optical filter guide member 802 included in the filter holding frame 801. Yes. The optical filter guide member 802 is provided on the filter holding frame main body 501. The optical filter guide member 802 has a shape protruding from the filter holding frame main body 501 so as to surround the opening 502 on the outer peripheral side of the opening 502. The optical filter guide member 802 is provided with slits 901, 902, and 903 that pass through the optical filter guide member 802 in a direction perpendicular to the optical axis.

  Further, the optical filter holding mechanism 800 includes a rattling prevention member 803. The rattling-preventing member 803 is formed by bending a wire-like member formed of a metal material so that the outer shape when viewed along the optical axis direction is a substantially square shape. The rattling prevention member 803 includes three corner portions 904 and 905 formed by bending so as to form a substantially square shape. In the backlash preventing member 803, both ends 906 of a wire-like member forming the backlash preventing member 803 are provided at a position corresponding to the fourth corner of the substantially square shape. Both end portions 906 are bent outward in a substantially square shape.

  Three corners 904 and 905 of the rattling prevention member 803 are respectively inserted into slits 901 and 902 included in the optical filter guide member 802. The backlash preventing member 803 is provided with an optical filter guide member 802 in which corner portions 904 that are diagonally opposite to both end portions 906 of the backlash preventing member 803 are positioned below the paper surface in FIGS. It passes through the slit 903 and is fixed to the filter holding frame 801 so as to be inserted into the slit 901 provided in the optical filter guide member 802 located on the upper side in FIG. 8, FIG. 9 and FIG.

  Both end portions 906 of the rattling prevention member 803 are larger than the slits 903 provided in the optical filter guide member 802 located on the lower side of the drawing. As a result, when the anti-rattle member 803 is attached to the filter holding frame 801, both ends 906 of the anti-rattle member 803 are reliably caught by the optical filter guide member 802 on the lower side of the paper, so that the anti-rattle member 803 is stabilized. Can be attached.

  FIG. 11 is an explanatory view showing an attached state of the rattle-preventing member 803 according to the second embodiment of the present invention. In FIG. 11, the rattling prevention member 803 attached to the filter holding frame 801 is in a state in which the outer shape contracts toward the optical axis. That is, the three corner portions 904 and 905 and both end portions 906 of the rattling prevention member 803 are in contact with the optical filter guide member 802 in a state in which the slits 901, 902, and 903 are expanded. Thereby, the position of the rattling prevention member 803 in the outer peripheral direction can be stabilized.

  12 and 13 are explanatory diagrams showing the shape and attachment state of the rattle-preventing member 803 according to the second embodiment of the present invention. In FIG. 12, a part of the optical filter holding mechanism 800 according to the second embodiment of the present invention is cut along a plane parallel to the optical axis, and the cross section is viewed from a position (side) facing the cross section. Is shown. FIG. 13 shows a state in which the backlash preventing member 803 provided in the optical filter holding mechanism 800 according to the second embodiment of the present invention is viewed from a direction orthogonal to the optical axis (the same direction as FIG. 12).

  12 and 13, the rattling prevention member 803 provided in the optical filter holding mechanism 800 according to the second embodiment of the present invention has a waveform that is alternately bent so as to protrude toward the eyepiece side and the objective side in the optical axis direction. It consists of the shape. The tip of the bent portion bent so as to protrude toward the objective side is in contact with the optical filter 211. The three corners 904 and 905 of the rattling prevention member 803 are bent in a state of projecting toward the objective side, and the rattling prevention member 803 has slits 901 and 902 in the optical filter guide member 802 in each slit 901 and 902. It abuts from the inside.

  When the rattling prevention member 803 contacts the optical filter guide member 802, a reaction force from the optical filter guide member 802 acts on the rattling prevention member 803, and the three corner portions 904 of the rattling prevention member 803 are applied. , 905 or the vicinity thereof is biased in the eyepiece direction. Thereby, the position of the rattling prevention member 803 in the optical axis direction can be stabilized.

  As described above, according to the optical filter holding mechanism 800 of the second embodiment, the rattling prevention member 803 protrudes along any one direction and the optical axis direction in the plane intersecting the optical axis. The optical filter 211 can be easily rattled with respect to the optical path in any two directions within the plane intersecting the optical axis and in the optical axis direction. The rattle prevention member 803 realized by a simple configuration can surely prevent this.

  In this way, by reliably preventing the optical filter 211 from rattling with respect to the optical path, it is possible to effectively suppress a decrease in optical performance due to the rattling of the optical filter 211 with respect to the optical path. Thus, the lens device 100 that exhibits stable optical performance can be obtained with a simple configuration and easy work.

(Embodiment 3)
Next, an optical filter holding mechanism 800 according to a third embodiment of the present invention will be described. In the third embodiment according to the present invention, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted. 14, FIG. 15, FIG. 16, FIG. 17 and FIG. 18 are explanatory views showing an optical filter holding mechanism according to a third embodiment of the present invention. In FIG. 14, the perspective view which looked at the optical filter holding mechanism of Embodiment 3 concerning this invention from the objective side is shown. In FIG. 15, the optical filter holding mechanism of Embodiment 3 according to the present invention is disassembled and a perspective state as viewed from the objective side is shown. In FIG. 16, the state which looked at the optical filter holding mechanism of Embodiment 3 concerning this invention from the arrow B direction in FIG. 14 is shown.

  17 and 18, a part of the optical filter holding mechanism according to the third embodiment of the present invention is cut along a plane that is parallel to the optical axis and orthogonal to each other, and each cross section faces the cross section. The state seen from the position (side) is shown. FIG. 17 shows a cross section of the optical filter holding mechanism according to the third embodiment of the present invention as viewed from the direction of arrow A in FIG. FIG. 18 shows a cross section of the optical filter holding mechanism according to the third embodiment of the present invention as viewed from the direction of arrow B in FIG.

  14, 15, 16, 17, and 18, the optical filter holding mechanism 1400 according to the third embodiment of the present invention is attached to the filter holding frame 1401 by the optical filter guide member 1402 provided in the filter holding frame 1401. The position of the optical filter 211 is predetermined. The optical filter guide member 1402 is provided on the filter holding frame main body 501. The optical filter guide member 1402 has a shape that protrudes from the filter holding frame main body 501 on the outer peripheral side of the opening 502 and has a bent end so as to cover the end of the optical filter 211.

  The tip of the optical filter guide member 1402 is bent toward the optical filter guide member 1402 facing each other, that is, the opening 502 side. The optical filter guide member 1402 is disposed so as to face the optical filter in the plane orthogonal to the optical axis. The optical filter guide member 1402 faces in a direction parallel to the facing direction of the filter holding frame guide member 504 in a plane orthogonal to the optical axis.

  The filter holding frame 1401 is attached to the mount member 213 by a filter holding frame guide member 504 provided in the mount member 213. The filter holding frame 1401 is restricted from moving in the optical axis direction by hooking the outer peripheral end of the filter holding frame 1401 to the bent tip of the filter holding frame guide member 504.

  The distal end portion of the filter holding frame guide member 504 is bent toward the filter holding frame guide member 504 facing each other, that is, the opening 506 side. The filter holding frame guide member 504 faces in a direction parallel to the facing direction of the optical filter guide member 1402 in a plane orthogonal to the optical axis. Thereby, the insertion direction of the optical filter 211 with respect to the filter holding frame 1401 and the insertion direction of the filter holding frame 1401 with respect to the mount member 213 can be made equal (parallel).

  The optical filter 211 is provided between the optical filter guide member 1402 and the filter holding frame main body 501 in the optical axis direction. Furthermore, between the optical filter 211 and the filter holding frame main body 501, a rattling prevention member 1501 provided in the optical filter holding mechanism 1400 according to the third embodiment of the present invention is provided. The rattle prevention member 1501 includes a bent portion 1502 that is bent so as to protrude toward the eyepiece in the optical axis direction. The tip of the bent portion 1502 protrudes closer to the eyepiece than the filter holding frame main body 501 through a slit 1701 provided in the filter holding frame main body 501.

  FIG. 19 is an explanatory diagram showing the filter holding frame 1401. FIG. 19 shows a state in which the filter holding frame 1401 is viewed from the eyepiece side in the optical axis direction. In FIG. 19, the slit 1701 provided in the filter holding frame 1401 has an elongated hole shape whose longitudinal direction is parallel to the insertion direction of the optical filter 211 with respect to the filter holding frame 1401. Two slits 1701 are provided with the opening 502 therebetween, and penetrate the filter holding frame main body 501 in the plate thickness direction. As a result, the rattling prevention member 1501 penetrates the filter holding frame 1401 and contacts the mount member 213 on both sides with the opening 502 therebetween. By allowing the backlash preventing member 1501 to pass through the filter holding frame 1401 and abut against the mount member 213, it is possible to prevent backlash in the outer circumferential direction of the backlash preventing member 1501 with respect to the filter holding frame 1401.

  The rattle prevention member 1501 makes the optical filter 211 abut on the optical filter guide member 1402 from the eyepiece side between the optical filter 211 and the mount member main body 505, and separates the optical filter 211 from the filter holding frame main body 501. A biasing force biasing in the direction is applied to the optical filter 211. Further, the rattling prevention member 1501 applies an urging force to the filter holding frame 1401 so as to separate the filter holding frame 1401 from the mount member main body 505.

  Since the filter holding frame 1401 is in a state where the outer peripheral end is hooked to the bent tip of the filter holding frame guide member 504, the filter holding frame 1401 is pressed against the bent tip by the urging force of the rattling prevention member 1501 as a result. Energized to be. Thereby, the play in the optical axis direction of the filter holding frame 1401 is suppressed, and the play in the optical axis direction of the optical filter 211 held in the filter holding frame 1401 can be prevented.

  Both end portions 1503 of the rattling prevention member 1501 are provided on the rear side in the insertion direction of the optical filter 211 with respect to the filter holding frame 1401. Both end portions 1503 are bent in a direction intersecting a plane perpendicular to the optical axis so as to be parallel to the optical axis direction. Thereby, the backlash preventing member 1501 inserted into the filter holding frame guide member 504 in the filter holding frame 1401 can be positioned, and the position of the backlash preventing member 1501 in the insertion direction can be determined well.

  As described above, according to the optical filter holding mechanism 1400 of the third embodiment, the rattling prevention member 1501 is formed by bending so as to protrude along the optical axis direction. Therefore, the play of the optical filter 211 with respect to the optical path in the plane intersecting the optical axis can be prevented by the play preventing member 1501 realized by a simple configuration. Further, by preventing the optical filter 211 from rattling with respect to the optical path, it is possible to suppress a decrease in optical performance due to the rattling of the optical filter 211 with respect to the optical path.

  Further, according to the optical filter holding mechanism 1400 of the third embodiment, since the bent portion 1502 of the rattle prevention member 1501 is in contact with the mount member 213 via the slit 1701, the mount member 213 and the bent portion 1502 are provided. The backlash in the outer peripheral direction of the backlash preventing member 1501 with respect to the filter holding frame 1401 can be prevented by the friction acting between the front and back. Accordingly, it is possible to prevent the optical filter 211 urged by the rattling prevention member 1501 from rattling with respect to the optical path. Further, by preventing the optical filter 211 from rattling with respect to the optical path, it is possible to suppress a decrease in optical performance due to the rattling of the optical filter 211 with respect to the optical path.

(Embodiment 4)
Next, an optical filter holding mechanism according to Embodiment 4 of the present invention will be described. In the fourth embodiment according to the present invention, the same parts as those in the first, second and third embodiments are indicated by the same reference numerals, and the description thereof is omitted. 20, FIG. 21, FIG. 22, FIG. 23 and FIG. 24 are explanatory views showing an optical filter holding mechanism according to a fourth embodiment of the present invention. FIG. 20 shows a perspective view of the optical filter holding mechanism according to the fourth embodiment of the present invention as viewed from the objective side. FIG. 21 shows a perspective view of the optical filter holding mechanism according to the fourth embodiment of the present invention, as seen from the object side. FIG. 22 shows a state in which the optical filter holding mechanism according to the fourth embodiment of the present invention is viewed from the direction of arrow B in FIG.

  23 and 24, a part of the optical filter holding mechanism according to the fourth embodiment of the present invention is cut along a plane that is parallel to the optical axis and orthogonal to each other, and each of the cross sections faces the cross section. The state seen from the position (side) is shown. FIG. 23 shows a cross section of the optical filter holding mechanism according to the fourth embodiment of the present invention as viewed from the direction of arrow A in FIG. FIG. 24 shows a cross section of the optical filter holding mechanism according to the fourth embodiment of the present invention as viewed from the direction of arrow B in FIG.

  20, FIG. 21, FIG. 22, FIG. 23, and FIG. 24, the optical filter holding mechanism 2000 according to the fourth embodiment of the present invention prevents rattling compared to the optical filter holding mechanism 1400 according to the third embodiment. The shape of the member is different. In the fourth embodiment, the position of the optical filter 211 with respect to the filter holding frame 1401 is determined by the optical filter guide member 1402 provided in the filter holding frame 1401.

  The optical filter holding mechanism 2000 according to the fourth embodiment of the present invention includes a rattling prevention member 2101 provided between the optical filter 211 and the filter holding frame main body 501. The rattling prevention member 2101 includes a bent portion 2102 that is bent so as to protrude toward the eyepiece side in the optical axis direction. In the rattle prevention member 2101, the bent portions 2102 are provided at two locations toward the eyepiece side so as to come into contact with the mount member main body 505 at two locations, whereby the rattle prevention member 2101 has a waveform. It has a shape. Both of the bent portions 2102 pass through a slit 1701 provided in the filter holding frame main body 501 and are in contact with the mount member main body 505.

  FIG. 25 is an explanatory view showing a filter holding frame 1401 provided in the optical filter holding mechanism 2000 according to the fourth embodiment of the present invention. FIG. 25 shows a state where the filter holding frame 1401 is viewed from the eyepiece side in the optical axis direction. In FIG. 25, the filter holding frame 1401 includes a slit 1701 whose longitudinal direction is parallel to the insertion direction of the optical filter 211 with respect to the filter holding frame 1401. Two slits are provided with the opening 502 in between, and each guides two bent portions 2102 projecting toward the eyepiece side toward the mount member main body 505.

  As a result, the rattle prevention member 2101 penetrates the filter holding frame 1401 and contacts the mount member 213 on both sides with the opening 502 therebetween. By allowing the rattling prevention member 2101 to pass through the filter holding frame 1401 and contact the mounting member 213, rattling in the outer circumferential direction of the rattling prevention member 2101 with respect to the filter holding frame 1401 can be prevented.

  The rattling prevention member 2101 makes the optical filter 211 abut against the optical filter guide member 1402 from the eyepiece side between the optical filter 211 and the mount member main body 505, and separates the optical filter 211 from the filter holding frame main body 501. A biasing force biasing in the direction is applied to the optical filter 211. Further, the rattling prevention member 2101 applies an urging force to the filter holding member so as to separate the filter holding frame 1401 from the mount member main body 505.

  Since the filter holding frame 1401 is in a state where the outer peripheral end is hooked on the bent tip of the filter holding frame guide member 504, the filter holding frame 1401 is pressed against the bent tip by the urging force of the rattling prevention member 2101 as a result. Energized to be. As a result, play of the filter holding frame 1401 in the optical axis direction can be prevented, and play of the optical filter 211 held by the filter holding frame 1401 in the optical axis direction can be prevented.

  As described above, according to the optical filter holding mechanism 2000 of the fourth embodiment, the rattling prevention member 2101 is formed by bending so as to protrude along the optical axis direction. Therefore, the play of the optical filter 211 with respect to the optical path in the plane intersecting the optical axis can be prevented by the play preventing member 2101 realized by a simple configuration. Further, by preventing the optical filter 211 from rattling with respect to the optical path, it is possible to suppress a decrease in optical performance due to the rattling of the optical filter 211 with respect to the optical path.

  Further, according to the optical filter holding mechanism 2000 of the fourth embodiment, the bent portions 2102 of the rattling prevention member 2101 are provided at a plurality of locations on the mount member 213 via the slits 1701 (two locations in the fourth embodiment). Therefore, the frictional force acting between the mount member 213 and the bent portion 2102 can be increased compared to the case where the contact is made at one place, and the outer periphery of the rattling prevention member 2101 with respect to the filter holding frame 1401 can be increased. The play in the direction can be surely prevented.

  Accordingly, it is possible to prevent the optical filter 211 biased by the rattling prevention member 2101 from rattling with respect to the optical path. Further, by preventing the optical filter 211 from rattling with respect to the optical path, it is possible to suppress a decrease in optical performance due to the rattling of the optical filter 211 with respect to the optical path.

  As described above, the optical filter holding mechanism, the lens device, and the imaging device according to the present invention are equipped with the optical filter holding mechanism that holds the optical filter, the lens device that includes the optical filter holding mechanism, and the lens device. It is useful for an imaging device, and is particularly suitable for an optical filter holding mechanism, a lens device, and an imaging device that are required to be downsized.

It is explanatory drawing (the 1) which shows the lens apparatus of Embodiment 1 concerning this invention. It is explanatory drawing (the 2) which shows the lens apparatus of Embodiment 1 concerning this invention. It is explanatory drawing (the 3) which shows the lens apparatus of Embodiment 1 concerning this invention. It is explanatory drawing (the 1) which shows the optical filter holding mechanism of Embodiment 1 concerning this invention. It is explanatory drawing (the 2) which shows the optical filter holding mechanism of Embodiment 1 concerning this invention. It is explanatory drawing (the 3) which shows the optical filter holding mechanism of Embodiment 1 concerning this invention. It is explanatory drawing which shows another shape of the rattle-prevention member of Embodiment 1 concerning this invention. It is explanatory drawing (the 1) which shows the optical filter holding mechanism of Embodiment 2 concerning this invention. It is explanatory drawing (the 2) which shows the optical filter holding mechanism of Embodiment 2 concerning this invention. It is explanatory drawing (the 3) which shows the optical filter holding mechanism of Embodiment 2 concerning this invention. It is explanatory drawing which shows the attachment state of the rattle prevention member of Embodiment 2 concerning this invention. It is explanatory drawing (the 1) which shows the shape and attachment state of the rattle prevention member of Embodiment 2 concerning this invention. It is explanatory drawing (the 2) which shows the shape and attachment state of the rattle prevention member of Embodiment 2 concerning this invention. It is explanatory drawing (the 1) which shows the optical filter holding mechanism of Embodiment 3 concerning this invention. It is explanatory drawing (the 2) which shows the optical filter holding mechanism of Embodiment 3 concerning this invention. It is explanatory drawing (the 3) which shows the optical filter holding mechanism of Embodiment 3 concerning this invention. It is explanatory drawing (the 4) which shows the optical filter holding mechanism of Embodiment 3 concerning this invention. It is explanatory drawing (the 5) which shows the optical filter holding mechanism of Embodiment 3 concerning this invention. It is explanatory drawing which shows a filter holding frame. It is explanatory drawing (the 1) which shows the optical filter holding mechanism of Embodiment 4 concerning this invention. It is explanatory drawing (the 2) which shows the optical filter holding mechanism of Embodiment 4 concerning this invention. It is explanatory drawing (the 3) which shows the optical filter holding mechanism of Embodiment 4 concerning this invention. It is explanatory drawing (the 4) which shows the optical filter holding mechanism of Embodiment 4 concerning this invention. It is explanatory drawing (the 5) which shows the optical filter holding mechanism of Embodiment 4 concerning this invention. It is explanatory drawing which shows the filter holding frame with which the optical filter holding mechanism of Embodiment 4 concerning this invention is provided.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Lens apparatus 210 Optical filter holding mechanism 211 Optical filter 212 Filter holding frame 213 Mount member 700 Shaking prevention member 800 Optical filter holding mechanism 801 Filter holding frame 802 Optical filter guide member 803 Shaking prevention member 901, 902, 903 Slit 904, 905 Corner portion 906 Both ends 1400 Optical filter holding mechanism 1401 Filter holding frame 1501 Shaking prevention member 2000 Optical filter holding mechanism 2101 Shaking prevention member 2102 Bending portion

Claims (6)

An optical filter disposed on the optical path;
A filter holding frame for holding the optical filter;
A support member for supporting the filter holding frame;
A biasing member that applies a biasing force that presses the optical filter against the filter holding frame between the optical filter and the support member;
An optical filter holding mechanism comprising:   The urging member is formed by bending or bending an elastic member having a predetermined elasticity so as to protrude along the urging direction of the urging member, and a part of the bent or bent portion is the support member. The optical filter holding mechanism according to claim 1, wherein the optical filter holding mechanism is provided so as to abut against the optical filter and another part abuts against the optical filter.   The biasing member is formed by bending or bending so as to protrude along any one direction in a plane intersecting the optical axis and at least one direction of the optical axis direction. The optical filter holding mechanism according to 2.   The optical filter holding mechanism according to claim 1, wherein the urging member is formed by bending or bending a wire-like member having a predetermined diameter. An optical filter disposed on the optical path;
A filter holding frame for holding the optical filter;
A support member that supports the filter holding frame; and a biasing member that applies a biasing force that presses the optical filter against the filter holding frame between the optical filter and the support member;
A lens provided on the optical path for allowing external light to enter the optical filter;
A lens device comprising: A photoelectric conversion element for imaging;
The lens device according to claim 5, wherein external light is incident on the photoelectric conversion element;
An imaging apparatus comprising:

Images