Image pickup apparatus

Abstract

An image pickup apparatus includes: a lens holder having an opening and configured to hold a lens; and a filter holder configured to hold the filter such that the filter can be inserted into and removed from an optical path of the lens, at least one of the filter and the filter holder is at least partially disposed in the opening so as to overlap at least a portion of the lens holder.

Description

Technical Field

[0001] The present invention relates to an image pickup apparatus equipped with a filter insertion / removal mechanism. Background Art

[0002] Conventionally, there is a widely known imaging apparatus equipped with a filter insertion / removal mechanism that allows insertion and removal of a filter such as an infrared (IR) cut filter, so that imaging can be performed even in a low-light environment. The filter insertion / removal mechanism is arranged in front of the imaging element. Therefore, it is necessary to extend the back focus in the optical axis direction in proportion to the thickness of the filter insertion / removal mechanism, which leads to the enlargement of the imaging apparatus.

[0003] As a technology for a filter insertion / removal mechanism, Japanese Patent Application Laid-Open No. 2016-33594 discusses a technology for shortening the back focus by configuring a filter moving frame that holds a filter outside an optical path and reducing the thickness of a member configured in the optical path.

[0004] However, the technology discussed in Japanese Patent Laid-Open No. 2016-33594 does not take into account the positional relationship between the lens holding frame that holds the lens and the filter holding frame that holds the filter, and therefore there is a possibility that the back focus may become long. Summary of the invention

[0005] The present invention is directed to providing an image pickup apparatus equipped with a filter insertion / removal mechanism capable of shortening the back focus.

[0006] According to one aspect of the present invention, an imaging device includes: a lens holder having an opening and configured to hold a lens; and a filter holder configured to hold a filter so that the filter can be inserted into and removed from an optical path of the lens, wherein when viewed in a direction perpendicular to an optical axis direction of the lens, at least one of the filter and the filter holder is at least partially arranged in the opening in a manner that overlaps with at least a portion of the lens holder.

[0007] Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a perspective view of an image pickup apparatus (lens barrel) according to the first exemplary embodiment.

[0009] Figure 2 is an exploded perspective view of the image pickup apparatus according to the first exemplary embodiment.

[0010] Figure 3is a perspective view of a filter frame according to a first exemplary embodiment.

[0011] Figure 4 is a front view of a fourth lens holding member according to the first exemplary embodiment.

[0012] Figure 5 is a rear view of the filter unit and its periphery according to the first exemplary embodiment when the filter is arranged in the optical path.

[0013] Figure 6 is a rear view of the filter unit and its periphery according to the first exemplary embodiment when the filter is arranged outside the optical path.

[0014] Figure 7 is a cross-sectional view showing a filter unit and its periphery according to the first exemplary embodiment.

[0015] Figure 8 is a cross-sectional view showing a filter unit and its periphery according to a second exemplary embodiment.

[0016] Fig. 9 is a perspective view of a fourth lens holding member according to the third exemplary embodiment.

[0017] Fig.10 is a rear view of the filter unit and its periphery according to the third exemplary embodiment when the filter is arranged in the optical path.

[0018] Fig.11 is a rear view of the filter unit and its periphery according to the third exemplary embodiment when the filter is arranged outside the optical path.

[0019] Fig.12 is a cross-sectional view showing a filter unit and its periphery according to a third exemplary embodiment.

[0020] Fig.13 is a perspective view of a lens barrel according to a fourth exemplary embodiment.

[0021] Fig.14 is an exploded perspective view of a lens barrel according to a fourth exemplary embodiment.

[0022] Fig.15 is a front view of a fourth lens holder according to the fourth exemplary embodiment.

[0023] Fig.16 is a cross-sectional view showing a filter unit and its periphery according to a fourth exemplary embodiment.

[0024] Fig.17 is a perspective view of a filter frame according to a fifth exemplary embodiment.

[0025] Fig.18 is a perspective view of a second filter holder according to a fifth exemplary embodiment.

[0026] Fig.19 is a cross-sectional view of a filter unit and its periphery according to a fifth exemplary embodiment. DETAILED DESCRIPTION

[0027] In the following, reference will be made to Figures 1 to 7 An image pickup apparatus according to a first exemplary embodiment of the present invention is described.

[0028] Figure 1 is a perspective view of an image pickup apparatus according to the first exemplary embodiment. Figure 2 is an exploded perspective view of the image pickup apparatus according to the first exemplary embodiment. Figure 3 2 is a perspective view of a filter frame according to the first exemplary embodiment. The imaging apparatus includes a lens barrel 1 and an imaging unit 30. The lens barrel 1 includes a lens unit 10 and a filter unit 20. Figure 4 is a front view (seen from the subject side) of the fourth lens holder according to the first exemplary embodiment. Figure 5 is a rear view of the filter unit 20 and its periphery when the filter is arranged in the optical path according to the first exemplary embodiment. Figure 6 is a rear view of the filter unit 20 and its periphery when the filter is arranged outside the optical path according to the first exemplary embodiment. Figure 7 is a cross-sectional view of the filter unit 20 and its periphery according to the first exemplary embodiment.

[0029] The lens unit 10 includes an imaging optical system including, in order from the subject side, a first lens unit 110, a second lens unit 120, a third lens unit 130, and a fourth lens unit 140. The lens unit 10 also includes a front sleeve 150 and a rear sleeve (a fourth lens holder 141), and the front sleeve 150 and the rear sleeve constitute a housing.

[0030] The first lens unit 110 is held by a first lens holder 111. The first lens holder 111 is engaged with and supported by a guide rod 151 so as to be movable in the optical axis direction of the imaging optical system (the optical axis is indicated by "O" in the figure). The first lens holder 111 is also engaged with a guide rod 152 and is restricted from rotating around the guide rod 151.

[0031] The first lens holder 111 holds a first unit bracket 112. The first unit bracket 112 is engaged with a lead screw portion of a first unit driving unit 113 including an actuator such as a stepping motor. When the lead screw portion is rotated by the first unit driving unit 113, the first lens holder 111 moves together with the first unit bracket 112 in the optical axis direction of the imaging optical system.

[0032] The second lens unit 120 is held by a second lens holder 121. The second lens holder 121 is engaged with and supported by a guide rod 153 in a manner movable in the optical axis direction of the imaging optical system. The second lens holder 121 is also engaged with a guide rod 154 and is restricted from rotating about the guide rod 153.

[0033] The second lens holder 121 also holds a second unit bracket 122. The second unit bracket 122 is engaged with a lead screw portion of a second unit driving unit 123 including an actuator such as a stepping motor, etc. When the lead screw portion is rotated by the second unit driving unit 123, the second lens holder 121 moves together with the second unit bracket 122 in the optical axis direction of the imaging optical system.

[0034] The third lens unit 130 is held by a third lens holder 131. The third lens holder 131 is engaged with and supported by a guide rod 153 in a manner movable in the optical axis direction of the imaging optical system. The third lens holder 131 is also engaged with a guide rod 154 and is restricted from rotating about the guide rod 153.

[0035] The third lens holder 131 also holds a third unit bracket 132. The third unit bracket 132 is engaged with a lead screw portion of a third unit driving unit 133 including an actuator such as a stepping motor, etc. When the lead screw portion is rotated by the third unit driving unit 133, the third lens holder 131 moves together with the third unit bracket 132 in the optical axis direction of the imaging optical system.

[0036] The fourth lens unit 140 is held by a fourth lens holder 141. The fourth lens holder 141 will be described in detail below.

[0037] The guide rods 151, 152, 153, and 154 are held by the front sleeve 150 and the fourth lens holder 141. To the fourth lens holder 141, the first unit driving unit 113, the second unit driving unit 123, and the third unit driving unit 133 are fixed.

[0038] Zooming and focusing of the imaging optical system are performed by moving the first lens unit 110 , the second lens unit 120 , and the third lens unit 130 in a predetermined positional relationship in the optical axis direction of the imaging optical system. The lens configuration of the lens unit 10 is not limited to the above-described example.

[0039] The filter unit 20 includes a filter (or optical filter) 21, a filter frame 22, and a filter driving unit 23 ( Figure 5 ). The filter 21 is an optical filter such as an infrared (IR) cut filter. The diagonal length 21a of the filter 21 is smaller than the diameter 140b of the lens 140a of the fourth lens unit 140 that is closest to the filter 21 in the optical axis direction. When viewed from the optical axis direction, this configuration reduces the area through which the filter 21 and the filter holding portion (or optical filter holding portion) 22a (described below) pass when they are inserted into or removed from the optical path, making it easier to ensure a space for the lens holding portion 141a (described below) of the fourth lens holder 141.

[0040] The filter frame 22 holds the filter 21. The filter frame 22 includes a filter holding portion 22a, and the filter 21 contacts the filter holding portion 22a. The filter frame 22 includes a groove portion 22b, and the filter 21 is fixed to the filter frame 22 by applying an adhesive to the groove portion 22b and curing the adhesive. The filter frame 22 can hold a plurality of filters. The filter frame 22 includes a filter frame side surface 22c at a side portion thereof, and the filter frame side surface 22c engages with a lens holding portion side surface 141c (described below) of the fourth lens holder 141.

[0041] The filter frame 22 also includes a gear portion 22d at its end. The gear portion 22d engages with the gear portion 23a of the filter drive unit 23. The filter drive unit 23 includes an actuator such as a stepping motor to rotate the gear portion 23a. When the gear portion 23a is rotated by the filter drive unit 23, the filter frame 22 moves in a direction perpendicular to the optical axis. Moving the filter frame 22 in this way allows the filter 21 to be inserted into or removed from the optical path. The driving method for inserting or removing the filter is not limited to the above examples. The filter frame 22 is inserted between the fourth lens holder 141 and the sensor holder 31 in the optical axis direction. This configuration limits the movement of the filter frame 22 in the optical axis direction. The method for limiting the movement of the filter frame 22 in the optical axis direction is not limited to the above examples.

[0042] The imaging unit 30 collects light and forms an image on the imaging element 35 using the collected light, thereby obtaining a desired image. The imaging unit 30 includes a sensor holder 31, a second filter 32, a sensor rubber 33, a sensor plate 34, an imaging element 35, and an imaging substrate 36. The second filter 32 is a filter such as a low-pass filter. The sensor holder 31 includes a second filter holding portion 31a ( Figure 7), and the second filter 32 is in contact with the second filter holding portion 31a. The second filter 32 is pressed against and held on the second filter holding portion 31a by the sensor rubber 33.

[0043] The image pickup element 35 is mounted on the image pickup substrate 36. The image pickup element 35 is fixed to the opening of the sensor plate 34 using an adhesive. The sensor plate 34 is fixed to the sensor holder 31 with screws or the like. The image pickup unit 30 does not necessarily include the second filter 32 and the sensor rubber 33.

[0044] The image pickup unit 30 does not necessarily include the sensor board 34, and the image pickup substrate 36 may be fixed to the sensor holder 31. In addition, the image pickup unit 30 does not necessarily include the sensor holder 31, and the image pickup substrate 36 or the sensor board 34 may be fixed to the fourth lens holder 141.

[0045] Next, the configuration of the fourth lens holder 141 and the configuration of the filter unit 20 and its periphery will be described in detail.

[0046] The fourth lens holder 141 holds the fourth lens unit 140. The fourth lens holder 141 includes a lens holder 141a, an opening 141b, a lens holder side surface 141c, and a lens holder 141d. The lens holder 141a is in contact with a lens 140a of the fourth lens unit 140 that is configured to be closest to the filter 21 in the optical axis direction. When viewed in the optical axis direction, the lens holder 141a is partially formed at a position that does not overlap with a region through which the filter 21 and the filter holder 22a pass when they are inserted or removed.

[0047] A portion of the filter holding portion 22a is arranged in the opening 141b. Therefore, when viewed in a direction perpendicular to the optical axis, the lens holding portion 141a of the fourth lens holder 141 and the filter 21 at least partially overlap each other.

[0048] In other words, when viewed in a direction perpendicular to the optical axis direction of the fourth lens unit 140 , at least a portion of the filter holding portion 22 a is arranged in the opening 141 b so as to overlap with at least a portion of the fourth lens holder 141 .

[0049] Therefore, the lens 140a of the fourth lens holder 141 and the filter 21 can be brought closer to each other. This reduces the space for inserting and removing the filter 21 in the optical axis direction, making it possible to shorten the back focus and thin the imaging apparatus.

[0050] The lens holding portion side surface 141c extends in a direction perpendicular to the optical axis. The lens holding portion side surface 141c contacts the filter frame side surface 22c of the filter frame 22. The lens holding portion side surface 141c restricts movement of the filter frame 22 in a direction perpendicular to the optical axis.

[0051] The lens holding portion 141d holds and fixes the fourth lens unit 140 between the lens holding portion 141d itself and the lens holding portion 141a by thermal caulking.

[0052] In the present exemplary embodiment, the lens holding portion 141a is partially formed in the fourth lens holder 141. Alternatively, the lens holding portion 141a may be formed around the entire circumference of the lens 140a. In this case, the lens holding portion 141a needs to be partially recessed into the region through which the optical filter 21 and the optical filter holding portion 22a pass when they are inserted or removed so as not to interfere with the optical filter 21 and the optical filter holding portion 22a.

[0053] like Figure 7 As shown, when viewed in a direction perpendicular to the optical axis, at least a portion of the filter frame 22 overlaps the second filter holding portion 31a. This configuration brings the filter 21 and the second filter 32 closer to each other. As a result, this reduces the space for inserting and removing the filter 21 in the optical axis direction, thereby making it possible to shorten the back focus and make the imaging apparatus thinner.

[0054] Next, the insertion of the filter 21 into the optical path and the removal of the filter 21 from the optical path will be described. Figure 5 In the illustrated state, when the gear portion 23 a is rotated by the filter driving unit 23 , the filter frame 22 moves in a direction perpendicular to the optical axis.

[0055] At this time, the filter frame side surface 22c of the filter frame 22 moves along the lens holding portion side surface 141c while being engaged with the lens holding portion side surface 141c of the fourth lens holder 141. This results in a state where the filter is arranged outside the optical path ( Figure 6 ). On the other hand, Figure 6 In the state shown, when the gear portion 23a is rotated by the filter driving unit 23, the filter frame 22 moves in a direction perpendicular to the optical axis. At this time, the filter frame side surface 22c of the filter frame 22 moves along the lens holding portion side surface 141c while engaging with the lens holding portion side surface 141c of the fourth lens holding member 141. This results in a state where the filter is arranged in the optical path ( Figure 5 ).

[0056] The filter 21 is configured to be inserted or removed in the long side direction of the filter 21. With this configuration, when viewed in the optical axis direction, the width of the region through which the filter 21 and the filter holding portion 22a pass when they are inserted or removed can be made smaller than a configuration in which the filter 21 is inserted or removed in the short side direction of the filter 21.

[0057] Therefore, it is easier to ensure a space for forming the lens holding portion 141 a.

[0058] With the above configuration, it is possible to provide an image pickup apparatus equipped with a filter insertion / removal mechanism that can shorten the back focus.

[0059] In the following, reference will be made to Figure 8 An image pickup apparatus according to a second exemplary embodiment of the present invention is described. Components common to the first exemplary embodiment are given the same reference numerals and numbers as in the first exemplary embodiment. Description of configurations common to the first exemplary embodiment will be omitted. Figure 8 is a cross-sectional view of a filter unit and its periphery according to a second exemplary embodiment. In the second exemplary embodiment, the position of the filter 21 relative to the filter frame 22 is different from that in the first exemplary embodiment.

[0060] In the present exemplary embodiment, the filter unit 20 is arranged at a position where the lens holding portion 141 a and the filter holding portion 22 a at least partially overlap when viewed in a direction perpendicular to the optical axis.

[0061] Unlike the first exemplary embodiment, the lens holding portion 141 a and the filter 21 do not overlap when viewed in the direction perpendicular to the optical axis.

[0062] With the above configuration, it is possible to provide an image pickup apparatus equipped with a filter insertion / removal mechanism that can shorten the back focus.

[0063] In the following, reference will be made to Figures 9 to 12 An image pickup apparatus according to a third exemplary embodiment of the present invention is described. Components common to the first exemplary embodiment are given the same reference numerals and numbers as in the first exemplary embodiment. Description of configurations common to the first exemplary embodiment will be omitted. Fig. 9 is a perspective view of a fourth lens holding member according to the third exemplary embodiment. Fig.10 is a rear view of the filter unit and its periphery when the filter is in the optical path according to the third exemplary embodiment. Fig.11 is a rear view of the filter unit and its periphery when the filter is out of the optical path according to the third exemplary embodiment. Fig.12 is a cross-sectional view of a filter unit and its periphery according to a third exemplary embodiment.

[0064] In the first exemplary embodiment, the filter frame side 22c of the filter frame 22 moves along the lens holding portion side 141c of the fourth lens holder 141. In the present exemplary embodiment, the filter frame 22 moves in a direction perpendicular to the optical axis along the guide pins 141e.

[0065] The fourth lens unit 140 is configured such that the lens 140a closest to the filter 21 in the optical axis direction is in contact with the lens holding portion 141a. The fourth lens unit 140 is inserted and fixed between the lens holding portion 141d and the lens holding portion 141a by heat caulking. When viewed in the optical axis direction, the lens holding portion 141d of the fourth lens holder 141 is partially formed at a position that does not overlap with the area through which the filter 21 and the filter holding portion 22a pass when they are inserted or removed. Although the lens holding portion 141d is partially formed in the fourth lens holder 141 in the present exemplary embodiment, the lens holding portion 141d may be formed around the entire circumference of the lens 140a. In this case, in the area through which the optical filter 21 and the optical filter holding portion 22a pass when they are inserted or removed, the lens holding portion 141d needs to be partially recessed in a manner that does not interfere with the optical filter 21 and the optical filter holding portion 22a.

[0066] Furthermore, the lens holding portion 141 d may be a separate member such as a pressure ring fixed to the fourth lens holder 141 .

[0067] The filter frame 22 has a guide hole 22e. The fourth lens holder 141 includes a guide pin 141e. The guide pin 141e engages with the guide hole 22e extending in a direction perpendicular to the optical axis, so that the filter frame 22 can move along the guide pin 141e in a direction perpendicular to the optical axis. When the gear portion 23a is rotated by the filter drive unit 23, the filter frame 22 moves in a direction perpendicular to the optical axis while being guided by the guide pin 141e. By moving the filter frame 22 in this way, the filter 21 can be inserted into or removed from the optical path. The method for moving the filter frame 22 in a direction perpendicular to the optical axis is not limited to the above-mentioned configuration. In addition, the driving method for inserting or removing the filter is not limited to the above-mentioned configuration.

[0068] In the present exemplary embodiment, the filter unit 20 is arranged at a position where the lens holding portion 141d and the filter 21 at least partially overlap when viewed in a direction perpendicular to the optical axis. This allows the lens 140a and the filter 21 to be close to each other. Therefore, the space for inserting and removing the filter 21 in the direction of the optical axis can be reduced, thereby making it possible to shorten the back focus and thin the imaging apparatus. As in the second exemplary embodiment, the filter holding portion 22a and the lens holding portion 141d can be configured to overlap each other in the direction of the optical axis.

[0069] With the above configuration, it is possible to provide an image pickup apparatus equipped with a filter insertion / removal mechanism that can shorten the back focus.

[0070] In the following, reference will be made to Figures 13 to 16 An image pickup apparatus according to a fourth exemplary embodiment of the present invention is described. Components common to the first exemplary embodiment are given the same reference numerals and numbers as in the first exemplary embodiment. Description of configurations common to the first exemplary embodiment will be omitted. Fig.13 is a perspective view of a lens barrel according to a fourth exemplary embodiment. Fig.14 is an exploded perspective view of a lens barrel according to a fourth exemplary embodiment. Fig.15 is a front view of a fourth lens holder according to the fourth exemplary embodiment. Fig.16 : is a cross-sectional view of a filter unit and its periphery according to a fourth exemplary embodiment. In the fourth exemplary embodiment, the third lens unit 130 is not provided. In addition, in the fourth exemplary embodiment, the fourth lens unit 140 is movable in the optical axis direction.

[0071] The lens unit 10 has an imaging optical system including, in order from the subject side, a first lens unit 110, a second lens unit 120, and a fourth lens unit 140. The fourth lens unit 140 is held by a fourth lens holder 141. The fourth lens holder 141 is engaged with and supported by a guide rod 153 in a manner movable in the optical axis direction of the imaging optical system. The fourth lens holder 141 is also engaged with a guide rod 154 and is restricted from rotating around the guide rod 153.

[0072] The fourth lens holder 141 holds a fourth unit bracket 142. The fourth unit bracket 142 is engaged with a lead screw portion of a fourth unit driving unit 143 including an actuator such as a stepping motor. When the lead screw portion is rotated by the fourth unit driving unit 143, the fourth lens holder 141 moves in the optical axis direction of the imaging optical system together with the fourth unit bracket 142. The guide rods 151, 152, 153, and 154 are held by the front sleeve 150 and the rear sleeve 155.

[0073] Zooming and focusing of the imaging optical system are performed by moving the first lens unit 110 , the second lens unit 120 , and the fourth lens unit 140 in a predetermined positional relationship in the optical axis direction of the imaging optical system.

[0074] When the fourth lens unit 140 moves toward the image pickup element in the optical axis direction, the fourth lens unit 140 and the filter 21 approach each other.

[0075] When viewed in the optical axis direction, the lens holding portion 141a for the lens 140a is partially formed at a position that does not overlap with the area through which the filter 21 and the filter holding portion 22a pass when they are inserted or removed. This allows the filter unit 20 to be configured at a position where the lens holding portion 141a and the filter 21 at least partially overlap when viewed in a direction perpendicular to the optical axis. Therefore, the lens 140a and the filter 21 can be brought closer to each other, making it possible to shorten the back focus and thin the imaging apparatus.

[0076] As in the second exemplary embodiment, the filter holding portion 22a and the lens holding portion 141d may overlap in the optical axis direction. In addition, as in the third exemplary embodiment, the filter 21 or the filter holding portion 22a and the lens holding portion 141d may overlap at least partially in the optical axis direction.

[0077] With the above configuration, it is possible to provide an image pickup apparatus equipped with a filter insertion / removal mechanism that can shorten the back focus.

[0078] Refer to the following Figures 17 to 19 An image pickup apparatus according to a fifth exemplary embodiment of the present invention is described. Components common to the first exemplary embodiment are given the same reference numerals and numbers as in the first exemplary embodiment. Description of configurations common to the first exemplary embodiment will be omitted. Fig.17 is a perspective view of a filter frame according to a fifth exemplary embodiment. Fig.18 is a perspective view of a second filter holder according to a fifth exemplary embodiment. Fig.19 : is a cross-sectional view of a filter unit and its periphery according to a fifth exemplary embodiment. The configuration of the second filter holder in the fifth exemplary embodiment is different from that in the first exemplary embodiment.

[0079] The second filter holding portion 31a is partially formed. The filter holding portion 22a of the filter frame 22 has a recessed portion 22f. The recessed portion 22f is formed at a position overlapping with the second filter holding portion 31a when viewed in the optical axis direction.

[0080] When viewed in a direction perpendicular to the optical axis, the second filter holding portion 31 a is arranged at a position where the filter holding portion 22 a and the second filter holding portion 31 a at least partially overlap in the optical axis direction.

[0081] Specifically, the filter frame 22 has a recessed portion in which the second filter holding portion 31a is partially arranged. This allows the filter 21 and the second filter 32 to be closer to each other, thereby making it possible to shorten the back focus and thin the imaging apparatus.

[0082] As in the third exemplary embodiment, the filter 21 or the filter holding portion 22a and the lens holding portion 141d may overlap at least partially in the optical axis direction. In addition, as in the fourth exemplary embodiment, the fourth lens unit 140 may be movable in the optical axis direction of the imaging optical system.

[0083] With the above configuration, it is possible to provide an image pickup apparatus equipped with a filter insertion / removal mechanism that can shorten the back focus.

[0084] Although some exemplary embodiments of the present invention have been described above, the present invention is not limited to these exemplary embodiments, and various modifications and changes can be made within the scope of the present invention. In addition, there is no limitation on the configuration of the exemplary embodiments as long as the design function is considered.

[0085] While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims

1. A camera device, comprising: a lens holder having an opening and configured to hold a lens; and a filter holder configured to hold a filter so that the filter can be inserted into and removed from the optical path of the lens, At least one of the filter and the filter holder is arranged in the opening so as to at least partially overlap with at least a portion of the lens holder when viewed in a direction perpendicular to the optical axis direction of the lens.

2. The imaging apparatus according to claim 1, wherein the filter holder is at least partially arranged in the opening so that the filter and the lens holder at least partially overlap when viewed in a direction perpendicular to the optical axis direction of the lens. 3 . The imaging apparatus according to claim 1 , wherein a diagonal length of the filter is shorter than a diameter of the lens. 4 . The imaging apparatus according to claim 1 , wherein the filter moves along a long side direction of the filter. 5 . The image pickup apparatus according to claim 1 , wherein a side surface of the lens holder is engaged with a side surface of the filter holder. 6 . The image pickup apparatus according to claim 1 , wherein the lens holder includes a guide pin, and the guide pin engages with a guide hole provided in the filter holder.

7. The imaging device according to claim 1, further comprising: Second filter; and a second filter holder configured to hold the second filter, Wherein the filter holder overlaps at least a portion of the second filter holder when viewed in a direction perpendicular to the optical axis direction of the lens.

Images