JP6211020B2 - Optical filter fixing member, optical filter fixing structure, and camera unit - Google Patents

Description

  The present invention relates to an optical filter fixing member disposed between an imaging element and a lens in a camera unit including an imaging element and a lens such as a CCD and a CMOS incorporated in a digital camera, a video camera, a surveillance camera, and the like. And an optical filter fixing structure.

When an optical filter is incorporated into a camera unit having an image sensor, for example, a method of fixing the optical filter on a cover glass on the image pickup surface of the image sensor with an adhesive or the like can be considered.
Further, for example, a method of fitting an optical filter in a predetermined frame and securing it with a pin or the like can be considered.
However, the method of fixing with an adhesive or the like requires a dedicated facility for fixing with an adhesive, and it is difficult to stably manufacture a camera unit without the facility.
Further, in the method of securing with a pin or the like, a gap is generated between the optical filter and the frame, and the optical filter moves within the frame.

Therefore, as another method, the optical filter is housed in a predetermined holder, and the optical filter is fixed by pressing the optical filter with an elastic member such as a rubber plate which is a separate member from the holder. Conceivable.
However, if the optical filter is pushed in with the entire elastic member, there is a problem that the force applied to the optical filter becomes too large.

  As a method of fixing the optical filter without pressing the entire elastic member, for example, Patent Document 1 discloses an elastic member provided to prevent foreign matter from entering between the optical filter and the CCD device. A method of pressing an optical filter and fixing the optical filter by a protrusion on a rib formed along the periphery of the opening is disclosed.

JP 2008-131397 A

However, although the technique disclosed in Patent Document 1 does not press the optical filter with the entire elastic member, the protrusions on the ribs are also used to prevent the intrusion of foreign matters, so that There is a problem that it is necessary to form the elastic filter, and the area where the elastic member holds the optical filter is still large, and the force applied to the optical filter becomes too large, which may damage the optical filter.
Also, if you try to reduce the contact area in order to reduce the force that presses the optical filter, the pressing surface of the protrusion will be narrowed, and the pressing surface will collapse when pressed, causing the optical filter to deform in the falling direction. Therefore, there is a problem that the optical filter may be damaged.

  The present invention has been made to solve the above-described problems, and provides an optical filter fixing member, an optical filter fixing structure, and a camera unit that can prevent damage to the optical filter during and after assembly. The purpose is to do.

The fixing member of the optical filter according to the present invention is a fixing member that fixes the optical filter to the lens holder of the camera unit, and has an opening that allows a subject image that passes through the optical filter to reach the imaging surface of the imaging device, and an opening And a plurality of protrusions that are formed around the opening and generate elastic force that presses the optical filter against the lens holder . The protrusions are on the side of the optical filter of the base part and the imaging of the base part. It is characterized in that it is formed in a pair at a position where the base portion is sandwiched and overlapped on the side surface of the element .

  According to this invention, it is possible to prevent the optical filter from being damaged during or after assembly.

It is a perspective view of the camera unit provided with the fixing member of the optical filter which concerns on Embodiment 1 of this invention. It is an exploded view which shows the fixing structure of the optical filter by the fixing member of the optical filter which concerns on Embodiment 1 of this invention. It is a figure explaining an example of the shape of the fixing member of the optical filter which concerns on Embodiment 1 of this invention. In Embodiment 1, it is the figure which used the processus | protrusion formed in a fixing member as the cone-shaped processus | protrusion. In Embodiment 1, it is sectional drawing of the camera unit of the state which assembled | attached the optical filter. In Embodiment 1, it is a figure explaining the positional relationship of the processus | protrusion provided in the fixing member when the optical filter is fixed. In Embodiment 1, it is a figure which shows an example of the fixing member formed so that the whole might be compressed. It is a figure explaining an example of the shape of the fixing member of the optical filter which concerns on Embodiment 2 of this invention. In Embodiment 2, it is sectional drawing of the camera unit of the state which assembled | attached the optical filter. It is a figure explaining an example of the shape of the fixing member of the optical filter which concerns on Embodiment 3 of this invention. It is a figure explaining an example of the shape of the fixing member of the optical filter which concerns on Embodiment 4 of this invention. It is a figure explaining the structure of the lens holder of Embodiment 5 of this invention. In Embodiment 5, it is sectional drawing of the camera unit 1 of the state which assembled | attached the optical filter.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a perspective view of a camera unit 1 provided with a fixing member 5 for an optical filter 4 according to Embodiment 1 of the present invention.
FIG. 2 is an exploded view showing a fixing structure of the optical filter 4 by the fixing member 5 of the optical filter 4 according to Embodiment 1 of the present invention.
Here, the fixing member 5 of the optical filter 4 according to the first embodiment is provided in the camera unit 1 including an imaging element and a lens such as a CCD and a CMOS incorporated in a digital camera, a video camera, a surveillance camera, or the like. This will be described below.

As shown in FIGS. 1 and 2, the camera unit 1 includes a lens unit 2, a lens holder 3, an optical filter 4, a fixing member 5, an image sensor 6, a substrate 7, and screws 8a and 8b.
The lens holder 3 is formed with a cylindrical protrusion-shaped lens fixing portion 3b for attaching the lens unit 2 (see FIG. 2B), and an optical filter is disposed on the opposite side of the lens fixing portion 3b with the lens holder 3 interposed therebetween. 4 and an insertion part 3a having a rectangular shape for inserting the image sensor 6 is formed (see FIG. 2A).

The lens fixing portion 3b and the insertion portion 3a are connected by an imaging hole 3c for causing the imaging device 6 to image light incident from the lens unit 2 (see FIG. 2A).
In addition, screw holes 3i and 3i for attaching the substrate 7 on which the imaging element 6 is mounted are provided at positions around the insertion portion 3a corresponding to the screws 8a and 8b (see FIG. 2A). .

The fixing member 5 is made of a material having elasticity, such as rubber, and having an appropriate repulsive force when compressed and not plastically deformed.
FIG. 3 is a diagram for explaining an example of the shape of the fixing member 5 of the optical filter 4 according to Embodiment 1 of the present invention.
3A is a perspective view of the fixing member 5, FIG. 3B is a front view of the fixing member 5, and FIG. 3C is a side view of the fixing member 5. 3A and 3C, the direction indicated by X is the front, that is, the direction of the lens unit 2.

The fixing member 5 is provided with an opening 5q that allows a subject image passing through the optical filter 4 to reach the image pickup surface of the image pickup device, and protrusions 5a to 5h are formed around the opening 5q.
The protrusions 5a to 5h are formed on both the front surface and the back surface of the fixing member 5, that is, the surface on the side in contact with the optical filter 4 and the surface on the side in contact with the image pickup element 6. Here, as shown in FIG. A total of 8 places shall be formed.
Further, the same number of protrusions 5a to 5h on the front surface and the back surface of the fixing member 5 are formed at positions overlapping each other with the base 5z interposed therebetween.

  In addition, although protrusion 5a-5h is made into the column shape in FIG. 3, it is not restricted to this, For example, what kind of shapes, such as a rectangle, a square, a hemisphere, may be sufficient. However, in the case of an elongated shape or a shape that is too tall, it may fall to the side when compressed when fixing the optical filter. A shape with is desirable. Here, the rectangle and the square mean that the protrusions 5a to 5h are rectangular and square when viewed from above.

  Further, for example, if the protrusions formed on the fixing member 5 are conical protrusions 5r to 5y as shown in FIG. 4, the direction of the repulsive force at the time of compression tends to be perpendicular to the surface, and the lateral direction This is more desirable because it prevents the fall of the By making the shape difficult to fall in the lateral direction, it is possible to apply force to the optical filter 4 stably.

Here, as shown in FIG. 3, the number of the protrusions 5 a to 5 h is eight in total, four on each of the front surface and the back surface of the fixing member 5. It is sufficient that there are at least two, and it is sufficient if the same number is formed at positions where the front surface and the back surface of the fixing member 5 overlap with each other across the base 5z.
As described above, at least two protrusions may be provided on the front surface and the back surface, respectively. However, the fixing member 5 needs to define a plane in order to improve the balance of force. It is desirable to provide three or more on the back side. Further, in order for the fixing member 5 to fix the optical filter 4 stably, it is desirable that the area of the polygon having the protrusion as a vertex is large and close to the axis target. To be close to the axis target means that there is no bias in tilting in any direction. For example, if there are three protrusions, a regular triangle is desirable, and if it is four, a shape close to a regular square is desirable. In FIG. 3, as an example, protrusions 5a to 5h are arranged at four corners around the imaging surface.

A fixing structure of the optical filter 4 will be described.
The optical filter 4 is inserted into the insertion portion 3a provided in the lens holder 3, and then the fixing member 5 is inserted into the insertion portion 3a. Finally, the image pickup device 6 is inserted into the insertion portion 3a and then inserted. The imaging element 6 is fixed to the lens holder 3 with screws 8a and 8b through holes provided in the substrate 7 on which the imaging element 6 is mounted.
At this time, when the screws 8a and 8b are tightened, the imaging element 6 approaches the lens holder 3, the fixing member 5 is compressed, and the optical filter 4 contacts the contact surface 3d of the fixing member 5, and the substrate 7 is The thickness is determined when the lens holder 3 comes into contact with the upper surface of the insertion portion 3a. When the fixing member 5 is compressed, the protrusions 5a to 5h are also compressed. Although the base 5z of the fixing member 5 is also compressed, most of the amount of compression is a portion of the protrusions 5a to 5h.
The fixing member 5 has a repulsive force by being compressed, and the optical filter 4 is pressed against the contact surface 3d (see FIG. 2A) of the insertion portion 3a of the lens holder 3 by the repulsive force. Fixed.
At this time, the substrate 7 and the lens holder 3 are fixed by screws 8 a and 8 b so that the lens holder 3 and the substrate 7 are in close contact with each other, and the optical filter 4 is pressed against the lens holder 3 by the fixing member 5. Since it is applied and closely adhered, dust can be prevented from entering.

FIG. 5 is a cross-sectional view of the camera unit 1 with the optical filter 4 assembled in the first embodiment. FIG. 5B is an enlarged view of the cross-sectional view of FIG.
FIG. 6 is a diagram illustrating the positional relationship between the protrusions 5a to 5h provided on the fixing member 5 when the optical filter 4 is fixed in the first embodiment.

In the state where the optical filter 4 is assembled to the camera unit 1, as shown in FIG. 5, the fixing member 5 is sandwiched between the optical filter 4 and the image sensor 6, and the protrusions 5 a to 5 h of the fixing member 5 are compressed. It is deformed.
When viewed from the front with the optical filter 4 assembled, the outer shape of the opening 5q of the fixing member 5 and the imaging hole 3c (see FIG. 2A) of the lens holder 3 is as shown in FIG. , Located outside the imaging range 6 a of the imaging element 6.
Further, the protrusions 5 a to 5 b of the fixing member 5 are formed so as to be located outside the imaging hole 3 c of the lens holder 3.

As described above, by fixing the plurality of protrusions 5a to 5h of the fixing member 5 in a concentrated manner, a fixing member having the same thickness as that of the fixing member formed so as to be compressed as a whole as shown in FIG. The spring constant can be made smaller, the repulsive force during compression is made smaller, and the total amount of force applied to the optical filter 4 is reduced.
That is, the repulsive force during compression is reduced by reducing the area of the portion of the fixing member 5 to be compressed. This is due to the repulsive force of the following Hooke's law.
F = (A × E × ΔL) / L
F: compression force A: cross-sectional area (of the compression part) E: elastic modulus ΔL: deformation amount L: length of the compression part before deformation

Here, E is constant because it is unique to the material. If L and ΔL are the same, A needs to be reduced in order to reduce the repulsive force. That is, when the area of the compression portion, here, the protrusions 5a to 5b is reduced, the repulsive force is reduced.

  As described above, according to the first embodiment, since the plurality of protrusions 5a to 5h are provided on the front surface and the back surface of the fixing member 5, the force for fixing the optical filter 4 is reduced and is stable. A force can be applied to the optical filter 4. Thereby, damage of the optical filter at the time of an assembly and after an assembly can be prevented.

Embodiment 2. FIG.
In the first embodiment, the protrusions 5 a to 5 h are formed on both the front surface and the back surface of the fixing member 5. In the second embodiment, an embodiment in which the protrusions 5a to 5d are formed only on one surface of the fixing member 5 will be described.

FIG. 8 is a diagram for explaining an example of the shape of the fixing member 5 of the optical filter 4 according to Embodiment 2 of the present invention.
FIG. 8A is a perspective view of the fixing member 5, FIG. 8B is a front view of the fixing member 5, and FIG. 8C is a side view of the fixing member 5. 8A and 8C, the direction indicated by X is the front, that is, the direction of the lens unit 2.
FIG. 9 is a cross-sectional view of the camera unit 1 with the optical filter 4 assembled in the second embodiment. In addition, FIG.9 (b) is an enlarged view of sectional drawing of Fig.9 (a).

The fixing member 5 according to the second embodiment is different from the first embodiment only in the place where the protrusion of the fixing member 5 described with reference to FIG. 3 is formed. Since other configurations are the same as those described in the first embodiment, a duplicate description is omitted.
The configuration of the camera unit 1 including the fixing member 5 of the optical filter 4 according to the second embodiment is the same as that described in the first embodiment with reference to FIGS. Omitted.

In the second embodiment, as shown in FIG. 8, the protrusions 5 a to 5 d are formed only on one side of the fixing member 5. Specifically, here, the protrusions 5a to 5d are formed only on the surface of the fixing member 5 on the side in contact with the optical filter 4, and the opposite surface, that is, the surface on the side in contact with the image sensor 6 is a flat surface. ing.
By doing in this way, the fixing member 5 is in contact with the image pickup device 6 on the surface (see FIG. 9), and as a result, the force applied to the image pickup device 6 in contact with the surface is dispersed and the amount of distortion is further reduced. can do.

Here, as shown in FIGS. 8 and 9, the number of the protrusions 5 a to 5 d is four. However, the number is not limited to this, and it is sufficient that there are at least two.
Here, as an example, the protrusions 5 a to 5 d are formed only on the surface of the fixing member 5 on the side in contact with the optical filter 4. However, the present invention is not limited to this, and the protrusions 5 a to 5 d are formed on the imaging element 6. It may be formed only on the surface on the side in contact with the fixing member 5 as long as it is formed only on either the front surface or the back surface of the fixing member 5.

  As described above, according to the second embodiment, the plurality of protrusions 5a to 5d of the fixing member 5 are provided on only one of the front surface and the back surface of the fixing member 5, thereby making contact with the surface. The force applied to the optical filter 4 or the image sensor 6 is dispersed to reduce the amount of distortion, and the optical filter can be prevented from being damaged during or after assembly.

Embodiment 3 FIG.
In the first embodiment, the same number of protrusions 5a to 5h on the front surface and the back surface of the fixing member 5 are formed at overlapping positions with the base 5z interposed therebetween. In the third embodiment, an embodiment in which the protrusions 5a to 5f formed on the fixing member 5 are formed at positions where the front surface and the rear surface do not overlap with each other with the base 5z interposed therebetween will be described.

FIG. 10 is a diagram for explaining an example of the shape of the fixing member 5 of the optical filter 4 according to Embodiment 3 of the present invention.
10A is a perspective view of the fixing member 5, FIG. 10B is a front view of the fixing member 5, and FIG. 10C is a side view of the fixing member 5. 10A and 10C, the direction indicated by X is the front, that is, the direction of the lens unit 2.

The fixing member 5 according to the third embodiment is different from the first embodiment only in the position where the protrusion of the fixing member 5 described with reference to FIG. 3 is formed. Since other configurations are the same as those described in the first embodiment, a duplicate description is omitted.
The configuration of the camera unit 1 including the fixing member 5 of the optical filter 4 according to the third embodiment is the same as that described in the first embodiment with reference to FIGS. Omitted.

In the third embodiment, the protrusions 5a to 5f are formed on both the front surface and the back surface of the fixing member 5, that is, the surface in contact with the optical filter 4 and the surface in contact with the image sensor 6. As shown in FIG. 10, a total of six locations are formed.
Further, the protrusions 5a to 5f on the front surface and the back surface of the fixing member 5 are formed at positions that do not overlap each other with the base 5z interposed therebetween.
By doing in this way, not only the protrusions 5a to 5f but also the fixing member 5 itself bends when the fixing member 5 is compressed, so that the spring constant becomes lower and the force applied to the optical filter 4 can be made smaller. it can.

  Here, as shown in FIG. 3, the number of the protrusions 5 a to 5 f is six in total, three on one side of the fixing member 5, but is not limited to this, and there are at least two on one side. What is necessary is just to be formed in the position which does not overlap on both sides of the base 5z on the surface of the fixing member 5, and a back surface.

  As described above, according to the third embodiment, the plurality of protrusions 5a to 5f are provided on the front and back surfaces of the fixing member 5, and the protrusions 5a to 5f sandwich the base 5z between the front and back surfaces of the fixing member 5. In the compression, not only the protrusions 5a to 5f but also the fixing member 5 itself is bent, so that the spring constant becomes lower and the force applied to the optical filter 4 becomes smaller. It is possible to prevent damage to the optical filter during and after assembly.

Embodiment 4 FIG.
In the first embodiment, the protrusions 5a to 5h are cylindrical. In the fourth embodiment, an embodiment including protrusions 5i to 5p having holes penetrating the protrusions will be described.

FIG. 11 is a diagram for explaining an example of the shape of the fixing member 5 of the optical filter 4 according to Embodiment 4 of the present invention.
FIG. 11A is a perspective view of the fixing member 5, FIG. 11B is a front view of the fixing member 5, and FIG. 11C is a side view of the fixing member 5. Note that the direction indicated by X in FIGS. 11A and 11C is the front, that is, the direction of the lens unit 2.

The fixing member 5 according to the fourth embodiment is different from the fixing member 5 described with reference to FIG. 3 in the first embodiment only in the shape of the protrusions. Since other configurations are the same as those described in the first embodiment, a duplicate description is omitted.
The configuration of the camera unit 1 including the fixing member 5 of the optical filter 4 according to the fourth embodiment is the same as that described in the first embodiment with reference to FIGS. Omitted.

In the fourth embodiment, the protrusions 5i to 5p formed on the front surface and the back surface of the fixing member 5 have holes penetrating the protrusions 5i to 5p as shown in FIG. Further, the holes of the protrusions 5i to 5p formed at positions overlapping with the base 5z are also opened in the base 5z so as to penetrate the base 5z.
By doing in this way, protrusion 5i-5p becomes easy to deform | transform, and the force concerning the optical filter 4 can be made smaller.

  Here, as an example, as shown in FIG. 11, the protrusions 5 i to 5 p have through-holes. However, the present invention is not limited thereto, and the protrusions 5 i to 5 p are in contact with the optical filter 4 and the image sensor 6. The tip surface may have a hole with a bottom, or may have a hollow inside the protrusion. By having the hole, the protrusion is easily deformed, and the force applied to the optical filter 4 is increased. It only needs to be able to be made smaller.

  As described above, according to the fourth embodiment, by forming the plurality of protrusions 5i to 5p of the fixing member 5 into a shape with holes, the protrusions 5i to 5p are more easily deformed, and the optical filter 4 It is possible to reduce the force applied to the optical filter, and it is possible to prevent damage to the optical filter during and after assembly.

Embodiment 5. FIG.
In the first embodiment, the fixing member 5 is provided with the protrusions 5 a to 5 h for fixing the optical filter 4. In the fifth embodiment, an embodiment in which the lens holder 3 of the camera unit 1 is provided with protrusions 3e to 3h for fixing the optical filter 4 in addition to the fixing member 5 will be described.

FIG. 12 is a diagram illustrating the configuration of the lens holder 3 according to the fifth embodiment of the present invention.
As shown in FIG. 12, in the lens holder 3, projections 3 e to 3 h are formed on a contact surface 3 d of the insertion portion 3 a in which the optical filter 4 is stored with the optical filter 4.
Other than that, the configuration is the same as that of the camera unit 1 described in the first embodiment with reference to FIGS.
Also, the configuration of the fixing member 5 is the same as the configuration described with reference to FIG.

FIG. 13 is a cross-sectional view of the camera unit 1 with the optical filter 4 assembled in the fifth embodiment.
As shown in FIG. 13, the protrusions 3 e to 3 h are formed at the positions where the protrusions 5 a to 5 d of the fixing member 5 are opposed to the position where the optical filter 4 is pressed against the lens holder 3 and the optical filter 4 is sandwiched between the protrusions 5 a to 5 d. The same number is formed. That is, the optical filter 4 is sandwiched between the protrusions 3e to 3h and the protrusions 5a to 5d.

Generally, it becomes difficult to obtain flatness as the area increases.
When the size of the area of the contact surface between the lens holder 3 and the optical filter 4 when the lens holder 3 does not have the protrusions 3e to 3h is compared, when there is no protrusion 3e to 3h, the lens holder 3 and the optical filter 4 is in contact with the contact surface 3d, and the area in contact with the optical filter 4 is larger than that in contact with the optical filter 4 at the tip portions of the protrusions 3e to 3h.
Therefore, when the lens holder 3 does not have the protrusions 3e to 3h, it becomes more difficult to obtain flatness than when the protrusions 3e to 3h are present, and the flatness of the contact surface 3d becomes lower.

  When pressed against a low flatness, the optical filter 4 bends along its shape, so that the lens holder 3 does not have the protrusions 3e to 3h, and the flatness of the contact surface 3d of the lens holder 3 with the optical filter 4 is high. In the case of low, when the optical filter 4 is pressed against the lens holder 3 by the fixing member 5, the optical filter 4 bends along the shape of the contact surface 3d with the optical filter 4, and the optical filter 4 is damaged or has an optical performance. May cause deterioration.

  In contrast, in the fifth embodiment, as described above, by forming the protrusions 3e to 3h on the lens holder 3, the portion of the lens holder 3 that contacts the optical filter 4 is only the tip of the protrusions 3e to 3h. Therefore, the flatness of the tip portions of the protrusions 3e to 3h can be easily obtained, and the optical filter 4 can be fixed without being deformed only by increasing the flatness of only the tip portions of the protrusions 3e to 3h. Since the fixing member 5 is deformed, the shape of the optical filter 4 is defined by the surface of the fixing member 5 on which the optical filter 4 is pressed by the fixing member 5.

  As described above, according to the fifth embodiment, the projections 3e to 3h are formed on the lens holder 3, and the portion that contacts the optical filter 4 of the lens holder 3 is only the tip of the projections 3e to 3h. The optical filter 4 can be fixed without deformation only by increasing the flatness only at the tip portions of the protrusions 3e to 3h.

In the present invention, within the scope of the invention, any combination of the embodiments, or any modification of any component in each embodiment, or omission of any component in each embodiment is possible. .
For example, the fourth embodiment may be applied to the second and third embodiments, and the protrusions 5a to 5d and 5a to 5f of the second and third embodiments may each have a hollow structure.
Further, for example, the fifth embodiment is applied to the second to fourth embodiments, and the projections 5a to 5d and 5a of the fixing member 5 are applied to the lens holder 3 of the camera unit 1 including the fixing member 5 of the second to fourth embodiments. -5f, 5i-5p are formed to have the same number of protrusions as the protrusions 5a to 5d, 5a to 5f, and 5i to 5p at the position where the optical filter 4 is pressed against the lens holder 3 and the position facing the optical filter 4. May be.

  1 camera unit, 2 lens unit, 3 lens holder, 3a insertion portion, 3b lens fixing portion, 3c imaging hole, 3d contact surface, 3e, 3f, 3g, 3h, 5a, 5b, 5c, 5d, 5e, 5f, 5g, 5h projection, 3i screw hole, 4 optical filter, 5 fixing member, 5i, 5j, 5k, 5l, 5m, 5n, 5o, 5p projection with hole, 5q opening, 5r, 5s, 5t, 5u, 5v, 5w, 5x, 5y Conical protrusion, 5z base, 6 imaging device, 6a imaging range, 7 substrate, 8a, 8b screw.

Claims (5)

A fixing member for fixing the optical filter to the lens holder of the camera unit,
An opening for allowing the subject image passing through the optical filter to reach the imaging surface of the imaging device;
A base portion around the opening;
A plurality of protrusions that are formed around the opening and generate an elastic force that presses the optical filter against the lens holder ;
The protrusions are formed in pairs at positions where the base portion is sandwiched and overlapped on the optical filter side surface of the base portion and the image sensor side surface of the base portion.
Fixing member of the optical science filter. Wherein the shape of the protrusions, the fixing member of claim 1 Symbol mounting characterized in that it is a cylinder. The protrusions claim 1 Symbol mounting of the fixing member and having a hole through said protrusion. Wherein the tip of the protrusion, claim 1 Symbol mounting of the fixing member and having a blind bore. An optical filter fixing structure comprising: an optical filter inserted into a lens holder of a camera unit; an imaging element; and a fixing member inserted between the optical filter and the imaging element to fix the optical filter,
The fixing member is
An opening that allows the subject image passing through the optical filter to reach the imaging surface of the image sensor;
A base portion around the opening;
A plurality of protrusions that are formed around the opening and generate an elastic force that presses the optical filter against the lens holder;
2. The optical filter fixing structure according to claim 1, wherein the protrusions are formed in pairs at positions where the base portion is sandwiched and overlapped on the side surface of the optical filter of the base portion and on the side surface of the imaging element of the base portion .

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