JP4882809B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging device capable of mounting a filter at the tip of a lens unit.

  In recent years, many digital cameras having an image sensor such as a charge coupled device (CCD) and a complementary metal-oxide semiconductor (CMOS) have been proposed. In particular, while downsizing, weight reduction, and thinning are the trend of hit products, higher performance of lenses is also required.

  In particular, a method of attaching a filter to the tip of a lens has been conventionally known in order to take a high-quality photograph or generate a special effect.

  With regard to such filter mounting, not only single-lens reflex type models in which lenses can be exchanged but also models capable of mounting filters on compact type cameras are increasing. Here, in order to make it possible to attach a filter in a compact type camera, it is better to operate the lens tip part on the front side than the body body, but the trend of recent cameras is small as mentioned above, The so-called “collapse type” model, in which the lens part protrudes to the front of the body during shooting and is stored in the body when not shooting, is becoming the mainstream of compact models that can be fitted with filters.

  Here, regarding the filter mounting, a public utility model publicity is published under the name of “filter adapter”.

In the above document, in order to attach a plurality of filters at the filter mounting portion at the lens tip, a pressing plate facing the inside of the ring-shaped filter is provided, and after mounting a plurality of filters, the filter is attached from the outside by this pressing plate. The structure hold | maintained by pressing toward inner side is disclosed.
Japanese Utility Model Publication No. 6-60845

  Here, in the said patent document, an inner cylinder and an outer cylinder are the structures which can rotate mutually, and a some filter becomes a structure fixed to an outer cylinder. That is, the inner cylinder needs to be firmly fixed to the lens cylinder of the camera. Usually, the fixing method of the inner cylinder to the lens cylinder is a screwing method, and it is necessary to screw in with a certain degree of torque in order to fix it securely.

Here, the configuration of the retractable lens barrel will be described with reference to FIGS.
FIG. 11 is a perspective view of the retractable lens barrel unit. The left side shows the state when the lens is retracted, and the right side shows the state when the lens is extended.
FIG. 12 is a perspective view showing the configuration of the retractable lens barrel unit. In the drawing, reference numeral 101 denotes a cam frame having a cam groove 101a, which is configured to be rotatable from the motor unit 105 via GEAR. Reference numeral 102 denotes a fixed frame having slide ribs 102a, which is fixed to the main body. Reference numeral 103 denotes a lens group barrel having a slide groove 103a and a caulking pin 103b.

  In the assembled state, the caulking pin 103b is fitted with the cam groove 101a, and the slide rib 102a and the slide groove 103a are also fitted.

  When the cam frame 101 is rotated by driving a motor incorporated in the motor unit 105, the lens group lens barrel 103 is restricted from being rotated by the fixed frame 102 through the fitting of the slide rib 102a and the slide groove 103a. In this state, the caulking pin 103b and the cam groove 101a are fitted to each other so that the caulking pin 103b is retracted in the optical axis direction without being rotated.

  Here, in particular, when a rotational torque is intentionally applied in the state shown in the right diagram of FIG. 11 in which the cam frame 101 is extended, a force is applied to the fitting portion between the slide rib 102a and the slide groove 103a, resulting in a strong torque. The slide rib 102a may get over the slide groove 103a, and the lens barrel may be damaged.

  As described above, the retractable lens barrel unit has a low strength in the twisting direction, and in the case of the configuration described in the above-mentioned patent document, the method of applying the operator's force with respect to the screwing force varies greatly. As a result of adding the screwing torque, there is a problem that the lens barrel portion is damaged.

Therefore, the present invention solves the above-described problem, and an image pickup apparatus that can be fitted with a filter can be fitted with a filter without applying excessive torque to the lens barrel, and the lens mirror when the filter is fitted. The present invention realizes an image pickup apparatus that prevents damage to a cylindrical portion and that can be reliably detached when a filter is detached.

In order to achieve the above object, the imaging device of the present invention is an imaging device having a filter mounting portion in a lens barrel that can be screwed in and attached to a filter, and the filter mounting portion includes a first ring portion, A second ring portion disposed on the outer periphery of the first ring portion and fixed to the lens barrel; and disposed between the first ring portion and the second ring portion; and the outer periphery of the first ring portion and A spring member along the inner periphery of the second ring portion, the first ring portion has a thread used for screwing the filter, and one of the first ring portion or the second ring portion is one end of the spring member. The other part of the first ring part or the second ring part has an engaging part that engages with the other end of the spring member. Engagement part when predetermined torque is applied By releasing the engagement with the spring member, the first ring portion can rotate with respect to the second ring portion. On the other hand, when removing the filter, the engagement portion releases the engagement with the spring member. The first ring portion does not rotate with respect to the second ring portion .

  According to the present invention described above, a filter can be attached to an imaging apparatus that can be attached with a filter without adding a problem torque to the lens barrel, and damage to the lens barrel when the filter is attached is prevented. At the same time, it is possible to realize an imaging device that can be reliably detached when the filter is detached.

(Embodiment 1)
Hereinafter, the imaging apparatus according to the embodiment will be described.

  1 and 2 are perspective views of the entire imaging apparatus. Reference numeral 1 denotes an imaging apparatus, 2 denotes a lens barrel, and 3 denotes a filter mounting portion. As shown in the figure, a lens barrel 2 is disposed at the center of the imaging apparatus 1, and a filter attachment portion 3 is disposed at the tip of the lens barrel 2. In FIG. 1, the lens barrel 2 is stored in the imaging apparatus 1, and in FIG. 2, the lens barrel 2 is extended to the imaging apparatus 1.

  FIG. 3 is a diagram showing the configuration of the filter mounting portion 3. Reference numeral 6 denotes a ring-shaped spring, and reference numeral 7 denotes a rotating ring. In this embodiment, a lens 8 and a lens retainer 9 are further mounted on the rotating ring 7 side.

  FIG. 4 is a view of the filter mounting portion 3 as viewed from the front. As shown in the lower end portion, the rotating ring 7 is provided with a stopper hole 7b.

  Among the AA cross sections in FIG. 4, FIG. 5 is a cross sectional view on the lower side where the stopper hole 7b is located, and FIG. 6 is a cross sectional view on the upper side.

  The mounting ring 5 is provided with a mounting ring groove 5a as shown in FIGS. 5 and 6, and the groove width E is larger than the dimension of the ring-shaped spring 6 in the optical axis direction (arrow A direction). At the same time, the groove depth F is smaller than the radial dimension H of the strand of the ring spring 6.

  Similarly, the rotating ring 7 is also provided with a rotating ring groove 7a as shown in FIGS. 5 and 6, and the groove width G is the same as the groove width E in the direction of the optical axis of the ring-shaped spring 6 (direction of arrow A). At the same time, the groove depth I is greater than H. The stopper hole 7b is provided on the rotating ring groove 7a as shown in FIG.

  FIG. 7 shows a cross section taken along the line BB of FIG. 5, and an end portion of the ring-shaped spring 6 is formed with a radially inwardly bent portion 6a as shown in FIG. 7, and this bent portion 6a is formed into a stopper hole 7b. Fit the mounting ring 5 in the fitted state.

  Here, the rotating ring 7 is configured with an attachment cylindrical portion 7c for attaching the attachment ring 5 (FIGS. 5 and 6), and the inner diameter portion of the attachment ring 5 covers the outer diameter portion of the attachment cylindrical portion 7c. And is mounted so as to be rotatable. At the time of mounting, the ring-shaped spring 6 is elastically deformed radially inward while being fitted in the rotating ring groove 7a, and the attachment ring 5 is fitted with the outer diameter kept smaller than the outer diameter of the attachment cylindrical portion 7c (see FIG. 5, FIG. 6). At this time, since the depth dimension I of the rotating ring groove 7a is larger than the radial dimension H of the ring-shaped spring 6, the state in which the outer diameter of the ring-shaped spring 6 is smaller than the outer diameter of the mounting cylindrical portion 7c can be maintained.

  In the process of fitting the mounting ring 5, the shape of the ring-shaped spring 6 that is forcibly elastically deformed is restored at the moment when the positions of the rotating ring groove 7 a and the mounting ring groove 5 a overlap with each other in the optical axis direction. Closely adheres to the bottom surface of the mounting ring groove 5a. At this time, as shown in FIG. 6, since the groove depth F of the attachment ring groove 5a is smaller than the radial dimension H of the element wire of the ring spring 6, the element wire of the ring spring 6 becomes the attachment ring groove 5a. And it will be in the state concerning both of rotation ring grooves 7a. As a result, the mounting ring 5 is attached to the rotating ring 7 so as not to move in the optical axis direction (the direction of arrow A in FIG. 6).

  Further, in the ring-shaped spring 6, the other end portion different from the end portion where the bent portion 6a is formed is formed with a convex portion 6b radially outward as shown in FIG. A stopper recess 5b is provided in at least one position of the bottom surface portion, and the convex portion 6b is configured to fit into the stopper recess 5b as shown in FIG.

  Here, when the rotating ring 7 is to be rotated in the direction of arrow R with respect to the mounting ring 5 from the state of FIG. 7B, one end of the ring-shaped spring 6 is fixed to the stopper hole 7b by the bent portion 6a. In conjunction with the movement of the stopper hole 7b in the right direction in the figure, the ring-shaped spring 6 is easily elastically deformed radially inward, and the protrusion 6b is disengaged from the stopper recess 5b. The state shown in FIG.

  On the contrary, when the rotating ring 7 is to be rotated in the direction of the arrow L with respect to the mounting ring 5 from the state of FIG. 7B, the stopper hole 7b is interlocked with the movement of the stopper hole 7b in the left direction in the figure. The ring-shaped spring 6 tends to move in the left direction in the figure, but the stopper recess 5b and the convex portion 6b are in an engaged state, and as a result, the ring-shaped spring 6 has a direction in which the outer diameter increases. The frictional force between the outer peripheral portion of the ring-shaped spring 6 and the bottom surface portion of the mounting ring groove 5a is increased, and the convex portion 6b is not released from the engagement with the stopper recess 5b. The attachment ring 5 cannot be rotated.

  In other words, when the rotating ring 7 is to be rotated in the direction of the arrow R with respect to the mounting ring 5, the rotating ring 7 can be easily rotated with a low rotational torque. In this case, even if high torque is applied, it cannot be rotated. That is, it functions similarly to the one-way clutch.

  The torque when rotating the rotating ring 7 in the direction of the arrow R with respect to the mounting ring 5 can be controlled by viscous grease or by the shape of the engaging portion between the convex portion 6b and the stopper recess 5b. It becomes.

  As for the control by the viscous grease, as shown in FIGS. 5 and 6, a torque control groove 5c is provided in the inner peripheral portion of the mounting ring 5 and the grease is injected into the inner peripheral portion of the mounting ring 5, thereby forming a ring shape. Grease spreads over the surface of the spring 6 and the sliding surface of the mounting cylindrical portion 7c on the rotating ring 7, and torque control can be performed by the viscosity of the grease.

  Regarding the control by the shape of the engaging portion between the convex portion 6b and the stopper recess 5b, the depth of the stopper recess 5b, the convex dimension of the convex portion 6b, or the shape of the stopper recess 5b and the convex portion 6b is electrical discharge machining, precision machining It is also possible to control by a processing method such as.

  As described above, when the rotating ring 7 is rotated in the filter tightening direction with respect to the mounting ring 5 fixed to the lens barrel on the imaging apparatus main body side, the filter is turned on when the tightening force exceeds a certain level of torque. Can idle with respect to the lens barrel so that excessive torque is not applied to the lens barrel.

  That is, as shown in FIGS. 5 and 6, a thread is formed on the inner diameter of the rotating ring 7 configured to be rotatable with respect to the mounting ring 5 fixed to the tip of the lens portion of the imaging apparatus main body. When attaching the filter to the mountain while screwing in, it is possible to avoid an excessive torque being applied to the lens barrel, and as a result, damage to the lens barrel can be prevented. Conversely, when the filter is removed, the rotating ring 7 does not rotate with respect to the attachment ring 5 (fixed to the imaging device), so that the filter can be reliably removed from the rotating ring 7.

  In the present embodiment, the example in which the lens 8 and the lens retainer 9 are mounted on the rotating ring 7 has been described. Usually, the mounting ring 5 is fixed to the tip of the lens, and the rotating ring 7 is attached to the mounting ring 5. In contrast, the image pickup apparatus is configured to be rotatable, and a filter is attached to the imaging apparatus configured as described above.

  At this time, the thread 7d provided on the inner diameter side of the rotary ring 7 is used for screwing the filter. However, the present invention is not limited to this, and the outer thread 7e can be used. It is.

  In addition, the unit composed of three points of the attachment ring 5, the ring-shaped spring 6, and the rotating ring 7 is provided on the imaging device side in this embodiment, but is not limited to this, and is provided on the filter unit side. It may be done. For example, in FIGS. 5 and 6, a thread is formed on the outer diameter of the mounting ring 5, and instead of eliminating the thread 7 e of the outer shape of the rotating ring 7, a cylindrical surface is provided so that the operator can easily grip the mounting ring. It is also possible to adopt a configuration in which an excessive torque is not applied while a screw thread of 5 outer diameter is screwed into a screw thread at the tip of the lens.

  Moreover, in this Embodiment, although the strand cross section of the ring-shaped spring 6 showed the example of a rectangle, it is not necessarily restricted to this, The same effect can be show | played also by a circular cross section.

  Further, it is desirable to provide a plurality of stopper recesses 5b provided on the attachment ring 5 on the circumference. That is, when the filter is removed, the screw portion of the filter and the rotating ring 7 starts to be released after the convex portion 6b is engaged with the stopper recess 5b. For example, the stopper recess 5b is arranged on the circumference. If there is only one, if the filter is in the state shown in FIG. 7A when the filter is removed, the projection 6b is interlocked with the rotation of the filter in the direction of the arrow L until the projection 6b engages with the stopper recess 5b. It will turn around from one lap.

  Further, the ring-shaped spring 6 is not necessarily limited to one ring-shaped member, and the same effect can be obtained by dividing the ring-shaped spring 6 into a plurality of arc-shaped members.

In addition to the bending process, the convex part 6b can be formed by pressing or laser processing, and by combining these processes with the bending process, the sliding surface with the stopper recess 5b can be further formed. It can be formed smoothly.
(Embodiment 2)
Next, a description will be given of a case where the internal / external relationship between the bent portion 6a and the rotating ring groove 7a, the stopper recess 5b, and the convex portion 6b is reversed. FIG. 8 is a diagram for explaining the present embodiment, and corresponds to FIG. 7 described in the first embodiment. In this embodiment, the bent portion 6 a at the end of the ring-shaped spring 6 is bent outward, and the outer stopper hole 5 c is provided at a corresponding position on the attachment ring 5. On the other hand, the convex portion 6 b at the other end has a convex shape inside, and an inner stopper recess 7 d is provided at a corresponding position on the rotating ring 7. Other configurations are the same as those in the first embodiment. Further, the shape of the ring-shaped spring 6 is such that the outer diameter in the natural state is larger than the diameter of the groove bottom of the mounting ring groove 5a, and gently curves inward in the vicinity of the convex portion 6b as shown in FIG. Is bent.

  In the same manner as described with reference to FIG. 7, in FIG. 8, when the rotating ring 7 is to be rotated in the direction of the arrow R with respect to the mounting ring 5, the ring-shaped spring 6 is engaged with the bent portion 6a and the outer stopper hole 5c. The inner stopper recess 7d on the rotating ring 7 moves to the right in FIG. 8, and in conjunction with this, the curved portion of the ring-shaped spring 6 near the convex portion 6b is elastically deformed outward, and the convex portion The engagement between 6b and the inner stopper recess 7d is released.

  Conversely, when the rotating ring 7 is to be rotated in the direction of the arrow L with respect to the mounting ring 5, the inner stopper recess 7d attempts to move in the left direction in the figure, but the other end of the engaging projection 6b. Since the bent portion 6a is fixed by the outer stopper hole 5c, the convex portion 6b does not move, and the engagement between the convex portion 6b and the inner stopper recess 7d is not released.

  In other words, when the rotating ring 7 is to be rotated in the direction of the arrow R with respect to the mounting ring 5, the rotating ring 7 can be easily rotated with a low rotational torque. In this case, even if high torque is applied, it cannot be rotated. That is, it functions similarly to the one-way clutch.

  At this time, the clutch force can be adjusted by changing the curvature of the curved portion in the vicinity of the convex portion 6b.

  In this embodiment, FIGS. 9A and 9B show diagrams corresponding to FIG. When the rotating ring 7 and the mounting ring 5 are assembled, the mounting ring 5 is assembled in a state in which it is elastically deformed inward so that the outer diameter of the ring-shaped spring 6 is smaller than the outer diameter of the mounting cylindrical portion 7c. At this time, since the bent portion 6a is bent outward, the stopper recess 5b needs to be opened to the tip of the attachment ring 5 as shown in FIG.

If the strength of the mounting ring 5 is required at this time, the stopper recess 5b is not penetrated to the outer diameter of the mounting ring 5, but is kept at a predetermined depth, and the outer wall of the mounting ring 5 is secured over the entire circumference. It can also be. FIG. 9B shows this state.
(Embodiment 3)
Next, a third embodiment of the present invention will be described. The present embodiment differs from the second embodiment in that the inner diameter in the natural state of the ring-shaped spring 6 is smaller than the outer diameter of the inner stopper recess 7d on the rotating ring 7, and the other points are the same. It is the composition.

  FIG. 10 shows the relationship between the attachment ring 5, the ring-shaped spring 6, and the rotating ring 7 in the present embodiment. As shown in the drawing, the shape of the ring-shaped spring 6 is configured such that it is once bent outward in the vicinity of the convex portion 6b and further bent inward at the tip side.

  In FIG. 10, when the rotating ring 7 is to be rotated in the direction of arrow R with respect to the mounting ring 5, the ring-shaped spring 6 does not rotate due to the engagement between the bent portion 6a and the outer stopper hole 5c. The inner stopper recess 7d moves to the right in FIG. 8, and in conjunction with this, the curved portion of the ring-shaped spring 6 near the convex portion 6b is elastically deformed outward, and the engagement between the convex portion 6b and the mounting cylindrical portion 7c is engaged. Canceled.

  Conversely, when the rotating ring 7 is to be rotated in the direction of the arrow L with respect to the mounting ring 5, the inner stopper recess 7d attempts to move in the left direction in the figure, but the other end of the engaging projection 6b. Since the bent portion 6a is fixed by the outer stopper hole 5c, the convex portion 6b does not move, and the engagement between the convex portion 6b and the mounting cylindrical portion 7c is not released.

  In the present embodiment, the dimension F of the attachment ring 5 in FIG. 6 is made larger than the radial dimension H of the element wire of the ring spring 6, and the dimension I of the rotating ring groove 7 a is set to the element of the ring spring 6. It is smaller than the radial dimension H of the line. When the mounting ring 5 and the rotating ring 7 are assembled, the ring-shaped spring 6 is elastically deformed outward (the inner diameter of the ring-shaped spring 6 is larger than the outer diameter of the mounting cylindrical portion 7c), and the rotating ring 7 is assembled in that state. At the moment when the position of the ring-shaped spring 6 and the rotating ring groove 7a is matched, the ring-shaped spring 6 enters the rotating ring groove 7a, and the ring-shaped spring 6 enters both the mounting ring groove 5a and the rotating ring groove 7a. The rotating ring 7 is fixed to the mounting ring 5 in the optical axis direction. In this case, the bent portion 6a and the attachment ring groove 5a are engaged, and the rotary ring 7 is inserted into the attachment ring 5 in a state where the ring-shaped spring 6 is incorporated in the attachment ring 5, so that the stopper recess 5b is illustrated. As shown in 9 (a) and (b), it is not necessary to constitute the tip of the attachment ring 5.

  In Embodiments 1 to 3, the difference between the case where the ring-shaped spring 6 is elastically deformed outside and the case where the ring-shaped spring 6 is elastically deformed inside will be described with reference to FIGS. 7B and 10. .

  First, as shown in FIG. 7B, when the rotating ring 7 is rotated in the direction of the arrow R with respect to the mounting ring 5, the ring-shaped spring 6 is engaged at both ends thereof, that is, the stopper recess 5b and the convex portion. 6b and the stopper hole 7b are engaged with the bent portion 6a, and a forcing force is applied so as to bend inward in the radial direction. Accordingly, the frictional force between the outer periphery of the ring-shaped spring 6 and the bottom surface of the attachment ring groove 5a is reduced, and the engagement state between the stopper recess 5b and the convex portion 6b is released with a small torque.

  On the other hand, when the rotating ring 7 is rotated in the direction of arrow R with respect to the attachment ring 5 in FIG. 10, the ring-shaped spring 6 is bent at both ends, that is, the stopper recess 5b and the convex portion 6b and the stopper hole 7b. By the engagement with the portion 6a, a forcing force is applied so as to bend inward in the radial direction. However, since the inner diameter of the ring-shaped spring 6 is in close contact with the outer diameter of the mounting cylindrical portion 7c from the beginning, it is impossible to bend in a direction in which the diameter is further reduced. The frictional force with the outer diameter of the portion 7c increases. The engagement state between the convex portion 6b and the inner stopper recess 7d is released by the bending of the curved portion in the vicinity of the convex portion 6b on the ring-shaped spring 6, but when compared with FIG. In the configuration, the torque for rotating the rotating ring 7 with respect to the mounting ring 5 increases. Thus, in order to adjust the torque of the one-way clutch mechanism between the mounting ring 5 and the rotating ring 7, in addition to adjusting the type and viscosity of the grease, the ring-shaped spring 6 in the natural state is thus adjusted. It is also possible to control the radius.

  The present invention is suitable for all imaging devices having a filter mounting structure.

The perspective view which shows an example of the whole image of the imaging device in embodiment of this invention The perspective view which shows an example of the whole image of the imaging device in embodiment of this invention The figure which shows the structure of the filter attachment part 3 in embodiment of this invention. Front view of filter mounting part The figure which shows the section of the filter attachment part The figure which shows the section of the filter attachment part Diagram showing the internal configuration of the filter mounting section Diagram showing the internal configuration of the filter mounting section The figure which shows the section of the filter attachment part Diagram showing the internal configuration of the filter mounting section A perspective view of a retractable lens barrel unit A perspective view showing a configuration of a retractable lens barrel unit

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Imaging device 2 Lens barrel 3 Filter attachment part 5 Mounting ring 6 Ring-shaped spring 7 Rotating ring

Claims (7)

An imaging apparatus having a lens barrel with a filter mounting portion on which a filter can be mounted by screwing,
The filter mounting part is
The first ring part,
A second ring portion disposed on an outer periphery of the first ring portion and fixed to the lens barrel;
A spring member disposed between the first ring portion and the second ring portion, and provided along an outer periphery of the first ring portion and an inner periphery of the second ring portion;
The first ring part has a thread used for screwing the filter,
One of the first ring part or the second ring part has a fixing part for fixing one end of the spring member,
The other of the first ring part or the second ring part has an engaging part that engages with the other end of the spring member,
When attaching the filter, when a predetermined torque is applied to the first ring portion, the engagement portion releases the engagement with the spring member, so that the first ring portion is engaged with the second ring portion. Can be rotated,
On the other hand, when removing the filter, the engagement portion does not release the engagement with the spring member, and the first ring portion does not rotate with respect to the second ring portion.
Imaging device. A bent portion is disposed at one end of the spring member,
The fixing part is a hole into which the bent part is fitted,
A convex portion is disposed on the other end of the spring member,
The engaging portion is a recess into which the convex portion fits.
The imaging device according to claim 1. The bent portion protrudes radially inward;
The convex portion protrudes radially outward,
The first ring part has the fixing part,
The second ring portion has the engaging portion.
The imaging device according to claim 2. The bent portion protrudes radially outward;
The convex portion protrudes inward in the radial direction,
The first ring portion has the engagement portion,
The second ring part has the fixing part,
The imaging device according to claim 2. The filter mounting part has a plurality of the engaging parts,
The imaging device according to any one of claims 1 to 4. A filter unit having a filter mounting part that can be screwed in and can be fitted with a filter,
The filter mounting part is
The first ring part,
A second ring portion disposed on the outer periphery of the first ring portion;
A spring member disposed between the first ring portion and the second ring portion, and provided along an outer periphery of the first ring portion and an inner periphery of the second ring portion;
The first ring part has a thread used for screwing the filter,
One of the first ring part or the second ring part has a fixing part for fixing one end of the spring member,
The other of the first ring part or the second ring part has an engaging part that engages with the other end of the spring member,
When attaching the filter, when a predetermined torque is applied to the first ring portion, the engagement portion releases the engagement with the spring member, so that the first ring portion is engaged with the second ring portion. Can be rotated,
On the other hand, when removing the filter, the engagement portion does not release the engagement with the spring member, and the first ring portion does not rotate with respect to the second ring portion.
Filter unit. A bent portion is disposed at one end of the spring member,
The fixing part is a hole into which the bent part is fitted,
A convex portion is disposed on the other end of the spring member,
The engaging portion is a recess into which the convex portion fits.
The filter unit according to claim 6.

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