JP2024039837A - Imaging device and filter switching unit - Google Patents

Abstract

An object of the present invention is to provide an imaging device that prevents foreign matter from entering an imaging element and prevents deterioration of durability.
[Solution] A filter holding member 13 has a first side that protrudes toward a base member 14 and extends in a second direction perpendicular to a first direction that is an optical axis direction and a moving direction of the filter holding member 13. The base member 14 has protrusions 22a and 22b, and the base member 14 has a second protrusion that protrudes toward the filter holding member 13, extends in a second direction, and is located inside the first protrusions 22a and 22b. The first elastic members 19a, 19b are arranged between the first protrusion 22a, 22b and the second protrusion 26a, 26b, and are pressed in the first direction. The two elastic members 20a, 20b are arranged between the first protrusions 22a, 22b and the wall 14b provided in the first direction of the base member 14, and are pressed in the first direction.
[Selection diagram] Figure 2

Description

The present invention relates to an imaging device such as a camera, a video camera, a surveillance camera, a vehicle-mounted camera, or a network camera, and a file switching unit installed therein.

In imaging devices such as surveillance cameras, in order to obtain images using incident infrared rays when photographing at night or in dark areas, filter switching is used to remove the infrared ray blocking filter from the optical path using a drive means such as a motor. Some are equipped with a mechanism.
Further, an imaging device is known in which lenses having different focal lengths can be exchanged so that the angle of view for photographing can be changed depending on the subject.
Patent Document 1 discloses a configuration in which a filter holding frame holding an infrared cut filter and a dummy glass is held on a filter base so as to be movable in a direction perpendicular to the optical axis of a photographic lens unit. . Further, Patent Document 1 discloses a configuration in which a photographing lens unit is screwed into a fixed lens barrel and fixed thereto, and is replaceable.

Patent No. 6882395

When the photographic lens unit is replaceable as in Patent Document 1, foreign matter may enter from the photographic lens unit when the photographic lens unit is removed. If this foreign object enters the image sensor side through the gap between the filter holding member (filter holding frame in Patent Document 1) and the base member (filter base in Patent Document 1) that supports the filter holding member, the foreign object will appear. is reflected in the captured image, degrading the image quality.
For example, if an elastic member that is pressed in a direction perpendicular to the moving direction of the filter holding member is installed between the filter holding member and the base member, the elastic member that is pressed in the direction perpendicular to the moving direction of the filter holding member and the base member can be inserted into the image sensor side from the gap between the filter holding member and the base member. It can prevent foreign matter from entering. However, in this case, since the filter holding member moves while rubbing against the elastic member, the elastic member is damaged and durability is deteriorated.

The present invention has been made in view of the above points, and it is an object of the present invention to provide an imaging device that prevents foreign matter from entering the imaging element side and prevents deterioration of durability.

The imaging device of the present invention includes a filter holding member that is arranged between a lens and an image sensor and holds an optical filter; The filter holding member includes a base member that supports the holding member movably in a first direction perpendicular to the optical axis direction, a first elastic member, and a second elastic member, and the filter holding member is attached to the base member. The base member has a first protrusion that protrudes to the side and extends in a second direction perpendicular to the optical axis direction and the first direction, and the base member protrudes toward the filter holding member and The first elastic member has a second protrusion extending in a second direction and located inside the first protrusion, and the first elastic member is arranged between the first protrusion and the second protrusion. The second elastic member is disposed between the first protrusion and a wall of the base member provided in the first direction, and is pressed in the first direction. and is pressed in the first direction.

According to the present invention, it is possible to provide an imaging device that prevents foreign matter from entering the imaging element side and prevents deterioration of durability.

FIG. 2 is an exploded perspective view of main parts of the imaging device according to the first embodiment. FIG. 2 is a sectional view of main parts of the imaging device according to the first embodiment. FIG. 3 is a perspective view of a filter holding member of the imaging device according to the first embodiment. FIG. 3 is a perspective view of a base member of the imaging device according to the first embodiment. FIG. 2 is a cross-sectional view of the vicinity of a filter switching unit of the imaging device according to the first embodiment. FIG. 3 is a cross-sectional view of the vicinity of the filter switching unit of the imaging device according to the first embodiment. It is a sectional view of the principal part of the photographing device of a modification. It is a sectional view of the principal part of the photographing device of a modification. It is a figure which shows the filter holding member of the imaging device based on 2nd Embodiment. It is a figure showing the base member of the photographing device concerning a 2nd embodiment. FIG. 7 is a sectional view of the vicinity of a filter switching unit of an imaging device according to a second embodiment. FIG. 2 is a cross-sectional view of the vicinity of a filter switching unit of an imaging device 1 according to a second embodiment. FIG. 2 is a cross-sectional view of the vicinity of a filter switching unit of an imaging device 1 according to a second embodiment. It is a figure which shows the example of a structure which arrange|positions an elastic member between slopes.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
(First embodiment)
FIG. 1 is an exploded perspective view of essential parts of an imaging device 1 according to the first embodiment. FIG. 2 is a sectional view of essential parts of the imaging device 1 according to the first embodiment. Each direction will be described below, with the optical axis direction as the Z direction.
The lens holder 2 includes a unit cover 2a provided with a cylindrical mounting portion 2b. The lens holder 2 is assembled into a unit including an image sensor unit 4 and a filter switching unit 5, which will be described later, and is mounted on the imaging device 1.
A lens barrel 3 is removably mounted on the mounting portion 2b of the lens holder 2. The lens barrel 3 holds a lens therein, but specific illustration of the lens is omitted here.

An image sensor unit 4 is installed inside the unit cover 2a of the lens holder 2. The image sensor unit 4 includes an image sensor 6 and an electric board 7 on which the image sensor 6 is mounted. The image sensor unit 4 is fixed to the holding plate 8 with an adhesive or the like. A holding plate 8 that holds the image sensor unit 4 is fixed to the lens holder 2 with screws or the like. The light rays of the subject image are formed on the image sensor 6 via the lens held by the lens barrel 3 .

Furthermore, a third optical filter 10 is installed within the unit cover 2a of the lens holder 2 between the image sensor 6 and the lens held by the lens barrel 3.
The third optical filter 10 is held by a filter holding member 9. The filter holding member 9 is a plate material having an opening, and holds the third optical filter 10 through the opening. The third optical filter 10 is, for example, an optical low-pass filter, raw glass, or the like. The filter holding member 9 is fixed to the holding plate 8 with adhesive, tape, etc., and the third optical filter 10 is arranged on the optical axis. By installing the third optical filter 10, it is possible to prevent foreign matter that enters from the lens holder 2 when the lens barrel 3 is removed from adhering to the image sensor 6, for example. The third optical filter 10 is installed with a gap between the third optical filter 10 and the image sensor 6, and even if foreign matter adheres to the third optical filter 10, the third optical filter 10 is located far away from the image sensor 6. Shadows become thinner and deterioration in image quality can be suppressed.

Further, within the unit cover 2a of the lens holder 2, a filter switching unit 5 is installed between the image sensor 6 and the lens held by the lens barrel 3. The filter switching unit 5 is arranged closer to the lens than the third optical filter 10 is.
The filter switching unit 5 includes a filter holding member 13 that holds a first optical filter 11 and a second optical filter 12, and supports the filter holding member 13 so as to be movable in a first direction perpendicular to the optical axis direction. A base member 14 is provided. In this embodiment, the filter holding member 13 is arranged on the lens side, and the base member 14 is arranged on the image sensor 6 side. The first direction is the Y direction, and the second direction perpendicular to the optical axis direction and the first direction is the X direction.

The filter holding member 13 is a plate material having two openings, and each opening holds the first optical filter 11 and the second optical filter 12. The first optical filter 11 and the second optical filter 12 are, for example, an infrared cut filter, a bandpass filter, an ND filter, or plain glass.

The base member 14 is configured in a box shape having walls 14b at both ends in the Y direction and walls 14c at both ends in the X direction. The filter holding member 13 accommodated in the box-shaped base member 14 is movable so as to slide in the Y direction (first direction). Thereby, the first optical filter 11 or the second optical filter 12 can be switched and inserted on the optical axis (on the optical path). The base member 14 is provided with an opening 15 that is arranged on the optical axis and through which light rays that have passed through the first optical filter 11 or the second optical filter 12 pass.
As an example of the drive mechanism of the filter switching unit 5, the filter holding member 13 is supported by a pair of guide bars 16 extending in the Y direction. Further, the filter holding member 13 is provided with a rack 17, and is engaged with the shaft of a stepping motor 18 serving as a drive source via the rack 17. The shaft of the stepping motor 18 rotates, and the rotation is converted into linear motion via the rack 17, so that the filter holding member 13 slides in the Y direction along the guide bar 16.

Further, as shown in FIG. 2, first elastic members 19a, 19b and second elastic members 20a, 20b are installed on the base member 14. Details of these first elastic members 19a, 19b and second elastic members 20a, 20b will be described later.

The filter switching unit 5 is held by having its base member 14 fixed to the lens holder 2 with screws or the like. Further, a third elastic member 21 is arranged between the base member 14 and the filter holding member 9. The third elastic member 21 has a frame shape so as to be arranged around the third optical filter 10, and is pressed in the Z direction while being sandwiched between the base member 14 and the filter holding member 9. Thereby, the gap between the base member 14 and the filter holding member 9 is closed, and it is possible to prevent foreign matter from entering through the gap between the base member 14 and the filter holding member 9.

FIG. 3 is a perspective view of the filter holding member 13 seen from the image sensor 6 side.
The filter holding member 13 has protrusions 22a and 22b that protrude toward the base member 14, that is, the image sensor 6, and extend in the X direction (second direction), and protrusions 22a and 22b that protrude toward the image sensor 6 and extend in the Y direction (first direction). It has protrusions 23a and 23b extending in the direction of . The protrusions 22a and 22b are called first protrusions, and the protrusions 23a and 23b are called third protrusions.
Specifically, ribs 24a and 24b that constitute first protrusions 22a and 22b are integrally formed at the ends of the filter holding member 13 in the Y direction. The ribs 24a and 24b have wall shapes that protrude toward the image sensor 6 and extend in the X direction.
Furthermore, ribs 25a and 25b forming third protrusions 23a and 23b are integrally formed at the ends of the filter holding member 13 in the X direction. The ribs 25a and 25b have wall shapes that protrude toward the image sensor 6 and extend in the Y direction.

FIG. 4 is a perspective view of the base member 14 seen from the lens barrel 3 side.
The base member 14 has protrusions 26a and 26b that protrude toward the filter holding member 13 side, that is, toward the lens, and extend in the X direction (second direction), and protrusions 26a and 26b that protrude toward the lens side and extend in the Y direction (first direction). It has extending protrusions 27a and 27b. The protrusions 26a and 26b are called second protrusions, and the protrusions 27a and 27b are called fourth protrusions.
Specifically, the base member 14 is integrally formed with ribs 28a and 28b that constitute the second protrusions 26a and 26b. The ribs 28a and 28b have wall shapes that protrude toward the lens and extend in the X direction. The ribs 28a and 28b are arranged on both sides of the opening 15 in the Y direction.
Furthermore, ribs 29a and 29b forming the fourth protrusion 27a and ribs 29c and 29d forming the fourth protrusion 27b are integrally formed on the base member 14. The ribs 29a and 29b have wall shapes that protrude toward the lens side and extend in the Y direction. The ribs 29a, 29b are arranged on one end side of the ribs 28a, 28b, and are arranged in parallel so as to face each other. Further, the ribs 29c and 29d have wall shapes that protrude toward the lens side and extend in the Y direction. The ribs 29c and 29d are arranged on the other end side of the ribs 28a and 28b, and are arranged in parallel so as to face each other. These ribs 29a to 29d are arranged between walls 14b provided in the Y direction.

The first elastic member 19a is installed adjacent to the outside of the second protrusion 26a (rib 28a). Although not visible in FIG. 4, the first elastic member 19b is installed adjacent to the outside of the second protrusion 26b (rib 28b). The first elastic members 19a, 19b have a plate shape or a bar shape extending in the X direction in accordance with the second protrusions 26a, 26b extending in the X direction. Note that inside and outside refer to a direction toward the optical axis and a direction away from the optical axis, respectively, in the XY plane.
Further, a second elastic member 20a (not visible in FIG. 4) and a second elastic member 20b are installed adjacent to the wall 14b. The second elastic members 20a, 20b have a plate shape or a bar shape extending in the X direction, matching the area between the fourth protrusions 27a, 27b of the wall 14b extending in the X direction.

The effect of reducing foreign matter adhering to the third optical filter 10 will be described below with reference to FIGS. 5 and 6.
FIG. 5 is a sectional view of the YZ plane near the filter switching unit 5 of the imaging device 1 according to the first embodiment, and (a) shows a state in which the first optical filter 11 is inserted on the optical axis. (b) shows the state in which the second optical filter 12 is inserted on the optical axis.
As shown in FIG. 5, in the filter switching unit 5, the inside of the first protrusion 22a (rib 24a) of the filter holding member 13 and the outside of the second protrusion 26a (rib 28a) of the base member 14 are connected to each other. Face to face. Further, the inside of the first protrusion 22b (rib 24b) of the filter holding member 13 and the outside of the second protrusion 26b (rib 28b) of the base member 14 face each other.

The first elastic member 19a described above is arranged between the inside of the first protrusion 22a (rib 24a) of the filter holding member 13 and the outside of the second protrusion 26a (rib 28a) of the base member 14. be done. The first elastic member 19b described above is located between the inside of the first protrusion 22b (rib 24b) of the filter holding member 13 and the outside of the second protrusion 26b (rib 28b) of the base member 14. will be placed in
The second elastic member 20a described above is arranged between the outside of the first protrusion 22a (rib 24a) of the filter holding member 13 and the wall 14b of the base member 14. Further, the second elastic member 20b described above is arranged between the outside of the first protrusion 22b (rib 24b) of the filter holding member 13 and the wall 14b of the base member 14.

Note that the positional relationship between the filter holding member 13 and the base member 14 in the Z-axis direction is maintained by a guide bar 16. Therefore, as shown in FIG. 5, there is a gap between the first protrusions 22a, 22b and the base member, and a gap is provided between the second protrusions 26a, 26b and the filter holding member 13. It may be made to have. This allows the filter holding member 13 to be moved smoothly without increasing the contact area between the filter holding member 13 and the base member 14.

Further, FIG. 6 is a cross-sectional view of the vicinity of the filter switching unit 5 of the photographing device 1 according to the first embodiment on the XZ plane.
As shown in FIG. 6, in the filter switching unit 5, the third protrusion 23a (rib 25a) of the filter holding member 13 is located between the two wall shapes that constitute the fourth protrusion 27a of the base member 14 ( It has a nested structure that fits between the ribs 29a and 29b. Furthermore, the third protrusion 23b (rib 25b) of the filter holding member 13 has a nested structure in which it enters between the two wall shapes (between the ribs 29c and 29d) that constitute the fourth protrusion 27b of the base member 14. It has become. When the filter holding member 13 is moved, the rib 25a will slide between the ribs 29a and 29b, so a gap is ensured between the rib 25a and the ribs 29a and 29b so as not to impede the sliding. Ru. The same applies to the rib 25b and the ribs 29c and 29d. In this way, the third protrusions 23a, 23b and the fourth protrusions 27a, 27b face each other with a gap in between.

Note that the positional relationship between the filter holding member 13 and the base member 14 in the Z-axis direction is maintained by a guide bar 16. Therefore, as shown in FIG. 6, there is a gap between the third protrusions 23a, 23b and the base member 14, and a gap is provided between the fourth protrusions 27a, 27b and the filter holding member 13. It may be made to have. This allows the filter holding member 13 to be moved smoothly without increasing the contact area between the filter holding member 13 and the base member 14.

As shown in FIG. 5(a), when the first optical filter 11 is inserted on the optical axis, the first elastic member 19a is attached to the first protrusion 22a and the second protrusion 26a. It is pinched and pressed in the Y direction. Thereby, the gap between the first protrusion 22a and the second protrusion 26a is closed by the first elastic member 19a. Further, the second elastic member 20b is sandwiched between the first protrusion 22b and the wall 14b and is pressed in the Y direction. Thereby, the gap between the first protrusion 22b and the wall 14b is closed by the second elastic member 20b. In this way, the gap between the first protrusion 22a of the filter holding member 13 and the second protrusion 26a of the base member 14, the gap between the first protrusion 22b of the filter holding member 13 and the wall 14b of the base member 14, It is possible to reduce the amount of foreign matter entering through the gaps.

As shown in FIG. 5(b), when the second optical filter 12 is inserted on the optical axis, the first elastic member 19b is attached to the first protrusion 22b and the second protrusion 26b. It is pinched and pressed in the Y direction. Thereby, the gap between the first protrusion 22b and the second protrusion 26b is closed by the first elastic member 19b. Further, the second elastic member 20a is sandwiched between the first protrusion 22a and the wall 14b and is pressed in the Y direction. Thereby, the gap between the first protrusion 22a and the wall 14b is closed by the first elastic member 20a. In this way, the gap between the first protrusion 22b of the filter holding member 13 and the second protrusion 26b of the base member 14, and the gap between the first protrusion 22a of the filter holding member 13 and the wall 14b of the base member 14. Foreign matter entering through the gap can be reduced.

In addition, as shown in FIG. (pause). Further, the third protrusion 23b (rib 25b) of the filter holding member 13 fits between the two wall shapes (between the ribs 29c and 29d) that constitute the fourth protrusion 27b of the base member 14. This labyrinth structure makes it difficult for foreign matter to enter through the gap between the filter holding member 13 and the base member 14.

As described above, since the filter switching unit 5 has a structure in which foreign matter is difficult to enter through the gap between the filter holding member 13 and the base member 14, foreign matter is prevented from entering the image sensor 6 side, and the third optical filter 10 It is possible to reduce the amount of foreign matter adhering to the surface.
Further, the first elastic members 19a, 19b and the second elastic members 20a, 20b are each fixed, and are pressed in the Y direction, which is the direction of movement, in accordance with the movement of the filter holding member 13. Therefore, when the filter holding member 13 moves, the first elastic member 19 and the second elastic member 20 are not rubbed, which reduces damage and prevents deterioration of durability.
In this way, it is possible to provide an imaging device that prevents foreign matter from entering the imaging element 6 side and prevents deterioration of durability.

Hereinafter, a modification of the photographing device 1 will be described.
FIG. 7 is a cross-sectional view of the main parts of the photographing device 1 according to a modified example.
As shown in FIG. 7, the center portion of the base member 14 is raised one step higher toward the lens side to form a pedestal portion 30, and the opening 15 is formed in the pedestal portion 30. In other words, the position of the base member 14 in the Z direction can be closer to the image sensor 6 than the position of the opening 15 in the Z direction.
By forming the platform portion 30 on the base member 14, a stepped portion 30a is formed. Even if the above-mentioned ribs 28a, 28b are not provided, the stepped portion 30a can be used as the second protruding portions 26a, 26b.
Furthermore, when viewed from the side of the image sensor 6, the base member 14 has a recessed portion formed by the pedestal portion 30. By accommodating the third optical filter 10 in the recess, the third optical filter 10 can be placed on the sides of the first elastic members 19a, 19b and the second elastic members 20a, 20b. . That is, the third optical filter 10 can be arranged in the range where the first elastic members 19a, 19b and the second elastic members 20a, 20b are present in the Z-axis direction. As a result, even when the back focus of the lens barrel 3 is short and the distance between the lens barrel 3 and the image sensor 6 in the Z direction is short, a gap between the filter holding member 13 and the base member 14 is secured, and ribs etc. It becomes possible to provide

FIG. 8 is a cross-sectional view of the main parts of the photographing device 1 of a modified example.
As shown in FIG. 8(a), the third optical filter 10 may be held in the opening 15 of the base member 14. This eliminates the need for the filter holding member 9, making it possible to save space and reduce costs. In this case, the third elastic member 21 may be pressed in the Z direction while being sandwiched between the base member 14 and the holding plate 8.
Further, as shown in FIG. 8(b), the third optical filter 10 may not be provided. This eliminates the third optical filter 10 and the filter holding member 9 that holds it, making it possible to save space and reduce costs. In this case as well, the third elastic member 21 may be pressed in the Z direction while being sandwiched between the base member 14 and the holding plate 8, as in FIG. 8(a). In the configuration example of FIG. 8(b), foreign matter adhering to the image sensor 6 can be reduced.

(Second embodiment)
Next, a second embodiment will be described. The second embodiment differs from the first embodiment in the configuration of the third protrusions 23a, 23b of the filter holding member 13 and the configuration of the fourth protrusions 27a, 27b of the base member 14. This is a modified example. Hereinafter, the same reference numerals are given to the same components as in the first embodiment, and the explanation thereof will be omitted, and the explanation will focus on the differences from the first embodiment.

9 is a diagram showing the filter holding member 13, where (a) is a perspective view of the filter holding member 13 as viewed from the imaging element 6 side, (b) is a side view of the filter holding member 13 as viewed from the +X side, and (c) is a side view of the filter holding member 13 as viewed from the -X side. Note that the direction from the third protrusion 23b to the third protrusion 23a and the direction from the fourth protrusion 27b to the fourth protrusion 27a are defined as the +X direction, the direction toward the subject is defined as the +Z direction, and the direction from the optical filter 12 to the optical filter 11 is defined as the +Y direction.
Similar to the first embodiment, ribs 24a, 24b constituting the first protrusions 22a, 22b are integrally formed on the ends of the filter holding member 13 in the Y direction.

Furthermore, ribs 35a and 35b forming the third protrusion 23a and ribs 35c and 35d forming the third protrusion 23b are integrally formed at the end of the filter holding member 13 in the X direction.
The ribs 35a and 35b have wall shapes that protrude toward the image sensor 6 and extend in the Y direction. The ribs 35a and 35b are arranged in parallel and facing each other. As shown in FIG. 9(b), the outer rib 35a has an inclined surface that extends toward the +Z direction as it moves toward the +Y direction on its surface on the image sensor 6 side. Furthermore, the inner rib 35b has an inclined surface on its surface facing the image pickup device 6, which slopes toward the -Z direction as it goes toward the +Y direction. In this way, the slope of the slope of the rib 35a, which is the outer wall-shaped portion, is opposite to the slope of the rib 35b, which is the inner wall-shaped portion. Note that the sloped surface of the rib 35a and the sloped surface of the rib 35b may be at the same angle or at different angles, as long as their inclinations are opposite.
Similarly, the ribs 35c and 35d have wall shapes that protrude toward the image sensor 6 and extend in the Y direction. The ribs 35c and 35d are arranged in parallel so as to face each other. As shown in FIG. 9(c), the outer rib 35c has an inclined surface that extends toward the +Z direction as it moves toward the +Y direction on its surface on the image sensor 6 side. Furthermore, the inner rib 35d has an inclined surface on its surface facing the image pickup device 6, which slopes toward the -Z direction as it goes toward the +Y direction. In this way, the slope of the rib 35c, which is the outer wall-shaped portion, is opposite to the slope of the rib 35d, which is the inner wall-shaped portion. Note that the sloped surface of the rib 35c and the sloped surface of the rib 35d may be at the same angle or at different angles, as long as their inclinations are opposite.

FIG. 10 is a diagram showing the base member 14, in which (a) is a perspective view of the base member 14 seen from the lens barrel 3 side, and (b) is a plan view of the base member 14 seen from the lens barrel 3 side. , (c) is a cross-sectional view taken along line II, and (d) is a cross-sectional view taken along line II-II. Note that in FIG. 10, illustration of the first elastic members 19a, 19b and the second elastic members 20a, 20b is omitted.
Similar to the first embodiment, ribs 28a and 28b forming second protrusions 26a and 26b are integrally formed on the base member 14.

Furthermore, ribs 39a and 39b forming the fourth protrusion 27a and ribs 39c and 39d forming the fourth protrusion 27b are integrally formed on the base member 14.
The ribs 39a and 39b have wall shapes that protrude toward the lens and extend in the Y direction. The ribs 39a and 39b are arranged on one end side of the ribs 28a and 28b, and are arranged in parallel so as to face each other. As shown in FIG. 10(c), the outer rib 39a has, on its lens-side surface, an inclined surface that extends toward the +Z direction as it goes toward the +Y direction. Furthermore, the inner rib 39b has an inclined surface on its lens-side surface that slopes toward the -Z direction as it goes toward the +Y direction. In this way, the slope of the rib 39a, which is the outer wall-shaped portion, is opposite to the slope of the rib 39b, which is the inner wall-shaped portion. Note that the sloped surface of the rib 39a and the sloped surface of the rib 39b may be at the same angle or at different angles, as long as their inclinations are opposite.
Here, the inclined surface of the outer rib 39a of the base member 14 contacts the inclined surface of the outer rib 35a of the filter holding member 13, and both are inclined at the same angle. Further, the inclined surface of the inner rib 39b of the base member 14 contacts the inclined surface of the inner rib 35b of the filter holding member 13, and is inclined at the same angle.
Similarly, the ribs 39c and 39d have wall shapes that protrude toward the lens side and extend in the Y direction. The ribs 39c and 39d are arranged on the other end side of the ribs 28a and 28b, and are arranged in parallel so as to face each other. As shown in FIG. 10(d), the outer rib 39c has, on its lens-side surface, an inclined surface that extends toward the +Z direction as it goes toward the +Y direction. Furthermore, the inner rib 39d has an inclined surface on its lens-side surface that slopes toward the -Z direction as it goes toward the +Y direction. In this way, the slope of the rib 39c, which is the outer wall-shaped portion, is opposite to the slope of the rib 39d, which is the inner wall-shaped portion. Note that the sloped surface of the rib 39c and the sloped surface of the rib 39d may be at the same angle or at different angles, as long as their inclinations are opposite.
Here, the inclined surface of the outer rib 39c of the base member 14 contacts the inclined surface of the inner rib 35c of the filter holding member 13, and both are inclined at the same angle. Further, the inclined surface of the inner rib 39d of the base member 14 contacts the inclined surface of the inner rib 35d of the filter holding member 13, and is inclined at the same angle.

The effect of reducing foreign matter adhering to the third optical filter 10 will be described below with reference to FIGS. 11 to 13.
FIG. 11 is a sectional view of the YZ plane near the filter switching unit 5 of the photographing device 1 according to the second embodiment, showing a state in which the first optical filter 11 is inserted on the optical axis.
As described in the first embodiment using FIG. 5(a), when the first optical filter 11 is inserted on the optical axis, the first elastic member 19a and the second protrusion 26a, and is pressed in the Y direction. Further, the second elastic member 20b is sandwiched between the first protrusion 22b and the wall 14b and is pressed in the Y direction. In this way, the gap between the first protrusion 22a of the filter holding member 13 and the second protrusion 26a of the base member 14, the gap between the first protrusion 22b of the filter holding member 13 and the wall 14b of the base member 14, It is possible to reduce the amount of foreign matter entering through the gaps. The case where the second optical filter 12 is inserted on the optical axis is also as described in the first embodiment using FIG. 5(b), and the explanation thereof will be omitted.

Further, FIG. 12 is a sectional view of the vicinity of the filter switching unit 5 of the imaging device 1 according to the second embodiment, and shows a state in which the first optical filter 11 is inserted on the optical axis. 12(a) is a sectional view taken along the XZ plane near the filter switching unit 5, FIG. 12(b) is a sectional view taken along the line III-III, and FIG. 12(d) is a sectional view taken along the line IV-IV. When the first optical filter 11 is inserted on the optical axis, the inclined surface of the inner rib 35b of the filter holding member 13 and the inclined surface of the inner rib 39b of the base member 14 are in contact with each other, and the filter holding member The inner rib 35d of the base member 13 and the inclined surface of the inner rib 39d of the base member 14 are in contact with each other. This makes it difficult for foreign matter to enter through the gap between the filter holding member 13 and the base member 14.

FIG. 13 is a sectional view of the vicinity of the filter switching unit 5 of the photographing device 1 according to the second embodiment, showing a state in which the second optical filter 12 is inserted on the optical axis. 13(a) is a cross-sectional view on the XZ plane near the filter switching unit 5, FIG. 13(b) is a cross-sectional view taken along the line VV, and FIG. 13(d) is a cross-sectional view taken along the line VI-VI. When the second optical filter 12 is inserted on the optical axis, the inclined surface of the outer rib 35a of the filter holding member 13 and the inclined surface of the outer rib 39a of the base member 14 are in contact with each other, and the filter holding member The outer rib 35c of the base member 13 and the inclined surface of the outer rib 39c of the base member 14 are in contact with each other. This makes it difficult for foreign matter to enter through the gap between the filter holding member 13 and the base member 14.

As shown in FIGS. 12 and 13, depending on the switching of the first optical filter 11 and the second optical filter 12, there is a state in which the inclined surfaces of the inner ribs 35b, 35d, 39b, and 39d are in contact with each other, and a state in which the inclined surfaces of the outer ribs 35b, 35d, 39b, and 39d are in contact with each other and The state changes to a state in which the inclined surfaces of the ribs 35a, 35c, 39a, and 39c are in contact with each other. In this embodiment, when the filter holding member 13 is in a predetermined position, the first optical filter 11 is inserted on the optical axis, and the second optical filter 12 is inserted on the optical axis. , the inclined surfaces of the third protrusions 23a, 23b and the inclined surfaces of the fourth protrusions 27a, 27b are in contact with each other. When moving the filter holding member 13 to switch between the first optical filter 11 and the second optical filter 12, the slopes of the third protrusions 23a and 23b and the fourth protrusions 27a and 27b are The state is such that the slope is separated from the inclined surface. Thereby, it becomes possible to move the filter holding member 13 smoothly.

In the second embodiment, the inclined surfaces of the ribs 35a to 35d of the filter holding member 13 are in contact with the inclined surfaces of the ribs 39a to 39d of the base member 14. That is, the third protrusions 23a, 23b and the fourth protrusions 27a, 27b are in contact with each other and face each other. This eliminates the gap between the filter holding member 13 and the base member 14, more reliably preventing foreign matter from entering there, and increasing the effect of reducing foreign matter adhering to the third optical filter 10. can.

Note that, as shown in FIG. 14, the fourth elastic member 31 is disposed between the sloped surfaces of the ribs 35a to 35d of the filter holding member 13 and the sloped surfaces of the ribs 39a to 39d of the base member 14. It's okay. By arranging the fourth elastic member 31, if there is a manufacturing error in the shape of the inclined surfaces, the gap between the inclined surfaces can be closed by the fourth elastic member 31.

Although the present invention has been described above along with the embodiments, the above embodiments are merely examples of implementation of the present invention, and the technical scope of the present invention should not be construed as limited by these embodiments. This is something that should not happen. That is, the present invention can be implemented in various forms without departing from its technical idea or main features.

The disclosure of this embodiment includes the following configurations.
(Configuration 1)
a filter holding member disposed between the lens and the image sensor and holding the optical filter;
a base member that is disposed closer to the lens or the image sensor than the filter holding member and supports the filter holding member so as to be movable in a first direction perpendicular to the optical axis direction;
a first elastic member;
a second elastic member;
The filter holding member has a first protrusion that protrudes toward the base member and extends in a second direction perpendicular to the optical axis direction and the first direction,
The base member has a second protrusion that protrudes toward the filter holding member, extends in the second direction, and is located inside the first protrusion,
the first elastic member is disposed between the first protrusion and the second protrusion and is pressed in the first direction;
The second elastic member is arranged between the first protrusion and a wall of the base member provided in the first direction, and is pressed in the first direction. Imaging device.
(Configuration 2)
The filter holding member has a third protrusion that protrudes toward the base member and extends in the first direction,
The base member has a fourth protrusion that protrudes toward the filter holding member and extends in the first direction,
The imaging device according to configuration 1, wherein the third protrusion and the fourth protrusion face each other.
(Configuration 3)
The third protrusion has a wall shape,
The fourth protrusion has a shape of two walls facing each other,
The imaging device according to configuration 2, wherein the third protrusion fits between the two wall shapes forming the fourth protrusion.
(Configuration 4)
The third protrusion and the fourth protrusion each have a wall shape,
The imaging device according to configuration 2, wherein a surface of the third protrusion on the base member side and a surface of the fourth protrusion on the filter holding member side are in contact with each other.
(Configuration 5)
The third protrusion has an inclined surface inclined in the first direction on a surface facing the base member,
The fourth protrusion has an inclined surface inclined in the first direction on a surface facing the filter holding member,
When the filter holding member is in a predetermined position, the inclined surface of the third protrusion and the inclined surface of the fourth protrusion are in contact with each other, and the filter holding member is moved from the predetermined position. The imaging device according to configuration 4, wherein the inclined surface of the third protrusion and the inclined surface of the fourth protrusion are separated from each other.
(Configuration 6)
According to configuration 4 or 5, an elastic member is disposed between a surface of the third protrusion on the base member side and a surface of the fourth protrusion on the filter holding member side. imaging device.
(Configuration 7)
the first elastic member is installed adjacent to the second protrusion,
7. The imaging device according to any one of configurations 1 to 6, wherein the filter holding member is pressed in the first direction in response to movement of the filter holding member.
(Configuration 8)
the second elastic member is installed adjacent to the wall,
8. The imaging device according to any one of configurations 1 to 7, wherein the image pickup device is pressed in the first direction in accordance with movement of the filter holding member.
(Configuration 9)
9. The imaging device according to any one of configurations 1 to 8, wherein the first protrusion has a wall shape.
(Configuration 10)
10. The imaging device according to any one of configurations 1 to 9, wherein the second protrusion has a wall shape.
(Configuration 11)
The base member is provided with a pedestal that is raised one step above the filter holding member,
10. The imaging device according to any one of configurations 1 to 9, wherein the step portion formed by the platform is the second protrusion.
(Configuration 12)
12. The imaging device according to any one of configurations 1 to 11, wherein another optical filter is disposed between the base member and the imaging device.
(Configuration 13)
12. The imaging device according to any one of configurations 1 to 11, wherein another optical filter is disposed in an aperture provided in the base member and disposed on the optical axis.

1: Imaging device, 2: Lens holder, 3: Lens barrel, 5: Filter switching unit, 6: Imaging element, 10: Third optical filter, 11: First optical filter, 12: Second optical filter , 13: filter holding member, 14: base member, 14b: wall, 19a, 19b: first elastic member, 20a, 20b: second elastic member, 22a, 22b: first protrusion, 23a, 23b: Third protrusion, 26a, 26b: second protrusion, 27a, 27b: fourth protrusion

Claims (14)

a filter holding member disposed between the lens and the image sensor and holding the optical filter;
a base member that is disposed closer to the lens or the image sensor than the filter holding member and supports the filter holding member so as to be movable in a first direction perpendicular to the optical axis direction;
a first elastic member;
a second elastic member;
The filter holding member has a first protrusion that protrudes toward the base member and extends in a second direction perpendicular to the optical axis direction and the first direction,
The base member has a second protrusion that protrudes toward the filter holding member, extends in the second direction, and is located inside the first protrusion,
the first elastic member is disposed between the first protrusion and the second protrusion and is pressed in the first direction;
The second elastic member is arranged between the first protrusion and a wall of the base member provided in the first direction, and is pressed in the first direction. Imaging device. The filter holding member has a third protrusion that protrudes toward the base member and extends in the first direction,
The base member has a fourth protrusion that protrudes toward the filter holding member and extends in the first direction,
The imaging device according to claim 1, wherein the third protrusion and the fourth protrusion face each other. The third protrusion has a wall shape,
The fourth protrusion has a shape of two walls facing each other,
The imaging device according to claim 2, wherein the third protrusion fits between the two wall shapes forming the fourth protrusion. The third protrusion and the fourth protrusion each have a wall shape,
The imaging device according to claim 2, wherein a surface of the third protrusion on the base member side and a surface of the fourth protrusion on the filter holding member side are in contact with each other. The third protrusion has an inclined surface inclined in the first direction on a surface facing the base member,
The fourth protrusion has an inclined surface inclined in the first direction on a surface facing the filter holding member,
When the filter holding member is in a predetermined position, the inclined surface of the third protrusion and the inclined surface of the fourth protrusion are in contact with each other, and the filter holding member is moved from the predetermined position. 5. The imaging device according to claim 4, wherein the inclined surface of the third protrusion and the inclined surface of the fourth protrusion are separated from each other. According to claim 4 or 5, an elastic member is disposed between a surface of the third protrusion on the base member side and a surface of the fourth protrusion on the filter holding member side. The imaging device described. the first elastic member is installed adjacent to the second protrusion,
The imaging device according to claim 1 or 2, wherein the filter holding member is pressed in the first direction in accordance with movement of the filter holding member. the second elastic member is installed adjacent to the wall,
The imaging device according to claim 1 or 2, wherein the filter holding member is pressed in the first direction in accordance with movement of the filter holding member. The imaging device according to claim 1 or 2, wherein the first protrusion has a wall shape. The imaging device according to claim 1 or 2, wherein the second protrusion has a wall shape. The base member is provided with a pedestal that is raised one step above the filter holding member,
The imaging device according to claim 1 or 2, wherein a stepped portion formed by the base portion is the second protrusion. The imaging device according to claim 1 or 2, further comprising another optical filter disposed between the base member and the imaging device. The imaging device according to claim 1 or 2, wherein another optical filter is arranged in an opening provided in the base member and arranged on the optical axis. A filter switching unit disposed between a lens and an image sensor in an imaging device, the filter switching unit comprising:
a filter holding member that holds an optical filter;
a base member that is disposed closer to the lens or the image sensor than the filter holding member and supports the filter holding member so as to be movable in a first direction perpendicular to the optical axis direction;
a first elastic member;
a second elastic member;
The filter holding member has a first protrusion that protrudes toward the base member and extends in a second direction perpendicular to the optical axis direction and the first direction,
The base member has a second protrusion that protrudes toward the filter holding member, extends in the second direction, and is located inside the first protrusion,
the first elastic member is disposed between the first protrusion and the second protrusion and is pressed in the first direction;
The second elastic member is arranged between the first protrusion and a wall of the base member provided in the first direction, and is pressed in the first direction. Filter switching unit.

Images