JP5777960B2 - Digital camera filter frame - Google Patents

Description

  The present invention relates to a structure of a filter frame that can be applied to a digital single-lens reflex camera. In particular, the present invention relates to a filter for protecting a lens, a circularly polarizing filter, a light amount adjusting filter, and a light effect that provides special effects. Filter frames for digital cameras that can be used for various filter frames such as filters and soft focus filters that can express the subject softly, and that do not cause moiré, false resolution, and suspicious colors in images shot through each filter Is to provide.

  Recently, filters for digital single-lens reflex cameras, such as lens protection filters, circular polarization filters, light amount adjustment filters, filters for special effects, and filters for soft focus that can express subjects softly Filters for high-value digital cameras have been provided.

Thus, the filter frame for holding the various filters described above has a function that can conventionally fit various filters on the front surface of the lens barrel of a digital camera and a function that can hold various filters in the filter frame. It has been considered sufficient.

However, the sensitivity of CCD image sensors and other devices used in image sensors for digital cameras has improved at an incredible speed, and the various filters that fit on the front of the lens barrel of a digital camera have a filter frame. On the incident light side, the incident light is totally reflected by the inner inner diameter of the filter frame and reaches the CCD image sensor of the digital camera, resulting in moiré, false resolution, and suspicious color in the captured image. The disadvantage of doing so has come to arise.

And as a countermeasure against defects such as moiré, false resolution, and suspicious colors that have been frequently pointed out recently, the filter frame that holds various filters in the digital camera can be used as much as possible. Although measures such as making thin are taken, this method has a certain effect in removing vignetting, but it has the disadvantage that moire, false resolution, and suspicious color occur in the captured image However, this measure does not provide a very effective solution, and has not yet completely solved this drawback.

6A, 6B, and 6C illustrate a conventional filter frame for a digital camera. FIG. 6A shows an assembly diagram of the filter, and FIG. FIG. 6C is a partial cross-sectional view for explaining the assembly completion state of A), and FIG. 6C is an enlarged view of a main part for explaining the outer peripheral portion of the filter frame of FIG. 6B.

6 (A), 6 (B), and 6 (C) illustrating a conventional filter frame, 50 is a filter frame, 51 is a filter outer frame formed by the filter frame 50, 52 is a filter lens, and 53 is a filter lens holding spring. , 54 is a lens fitting portion, and 55 is a lens pressing edge portion. A female screw 58 for screwing another attachment is screwed to the inner inner diameter portion 57 on the incident light side 56 of the filter outer peripheral frame 51. Further, on the camera lens side 59 of the filter outer peripheral frame 51, a male screw 60 for screwing the filter outer peripheral frame 51 on the front surface (not shown) of the camera lens barrel is screwed. The outer cylinder part 61 is formed.

As shown in FIG. 6A, the filter frame 50 of the conventional example is composed of parts of a filter outer peripheral frame 51, a filter lens 52, and a filter lens pressing spring 53, and a lens pressing edge 55 in the filter outer peripheral frame 51. A filter frame 52 is manufactured as shown in FIG. 6B by fitting a filter lens 52 inside and fixing the filter lens with a holding spring 53.

  Thus, the filter frame 50 assembled and manufactured as shown in FIG. 6B is expected to reach the imaging element of the digital camera as shown in FIG. 6C in which the filter outer peripheral frame 51 is enlarged. In addition to the effective light beam such as L62, there is also a harmful light beam such as L63 that is incident obliquely on the filter frame 50. The harmful light beam such as L63 is a peripheral edge 64 of the lens holding edge 55. Or the like with a certain incident angle, and when the incident angle exceeds about 40 degrees, it is totally reflected on the surface of the peripheral edge 64, and the harmful light beam L63 reaches the image sensor of the digital camera. Therefore, there has been a problem that image quality is greatly deteriorated due to the occurrence of moiré, false resolution, and suspicious colors in the captured video.

A female screw 58 for screwing another attachment to the front surface of the filter frame is screwed on the inner inner diameter portion 57 on the incident light side 56 of the filter outer peripheral frame 51, and the sectional shape of the female screw 58 is provided. The thread has a saw-tooth shape, and the light incident on this part is not totally reflected even if it is reflected by this surface, and the reflected light reaching the image sensor of the digital camera is extremely small.

  Thus, the problem to be solved by the present invention is a configuration in which light rays incident obliquely on the filter in the filter frame for the digital camera are not totally reflected at, for example, the peripheral edge portion of the lens pressing edge portion. This prevents harmful rays from reaching the image pickup device of the digital camera, and solves the problem that the image quality is greatly reduced due to the occurrence of moire, false resolution, and suspicious colors in the video.

In the present invention, when manufacturing a filter for a digital camera by assembling components including a filter outer frame, a filter lens, and a filter lens holding spring, the shape of the holding edge of the filter lens provided on the filter outer frame is the central axis. A two-step stepped filter holding edge that narrows toward the bottom is formed, and the two-step stepped filter holding edge constitutes a light shielding ring. In addition, a mechanism that prevents the light incident on the filter from being totally reflected at the two-step stair-shaped shading ring is designed to prevent harmful rays from reaching the image sensor of the digital camera. Prevent false resolution and suspicious colors.

Further, according to the present invention, when a filter is manufactured by assembling components including a filter outer peripheral frame, a filter lens, and a filter lens pressing spring, the shape of the pressing edge of the filter lens provided on the filter outer peripheral frame narrows toward the central axis. A plurality of stepped filter holding edges are formed, and the plurality of stepped filter holding edges constitute a light shielding ring. In addition, by adopting a mechanism that does not totally reflect light incident obliquely on the filter at the multistage stepped light-shielding ring part, it has been devised so that harmful light does not reach the image sensor of the digital camera, and moire and It prevents false resolution and suspicious colors.

As an example, the present invention assembles a filter outer frame and a filter lens, and a plurality of stepped filter holding edges, and forms the filter lens holding edge of the filter lens provided on the filter outer frame. A plurality of stepped filter holding edge rings narrowing toward the central axis are formed, and the plurality of stepped filter holding edge rings constitute a light shielding ring. The multi-step filter holding edge shading ring is fixed by holding the filter lens inside the filter outer frame by a female screw ring provided on the inner diameter part of the front surface of the filter outer frame. Because the shading ring made of is an independent part from the filter outer frame, precision processing is easy, and it prevents harmful rays from reaching the image sensor of the digital camera. The present invention provides a filter frame for a digital camera that eliminates the occurrence of suspicious colors.

Thus, in the present invention, the configuration in which the light beam obliquely incident on the filter lens is not totally reflected by the pressing edge portion of the filter lens having the stepped light shielding ring shape is a filter that forms the stepped light shielding ring. The shape of the holding edge and the holding edge of the filter lens is made into a two-step or multi-step staircase that narrows toward the optical axis, and the two-step or multi-step stair shape is above and below the nose at the tread surface. It can be selected as an embodiment that the shape has an inclination of 45 degrees or less.

  In addition, the configuration in which the light beam obliquely incident on the filter lens is not totally reflected by the holding edge portion of the filter lens having the stepped light shielding ring shape is that the shape of the filter holding edge portion and the holding edge of the filter lens is light. Two-step or multi-step staircase shape that narrows toward the axis, and the two-step or multi-step staircase shape has an inclination within 45 degrees from the stair nose and a warp within 45 degrees at the kick-up part. The shape can be selected as an example.

  Furthermore, the configuration in which the light beam obliquely incident on the filter lens is not totally reflected by the holding edge portion of the filter lens having the stepped light shielding ring shape is that the shape of the filter holding edge portion and the holding edge of the filter lens is as follows. A two-step or multiple-step staircase shape narrowing toward the optical axis is formed, and the two-step or multi-step staircase shape portion has an arbitrary inclination from the step nose at each tread surface portion and the kick-up portion. Can be selected as an example.

  Thus, the present invention provides a digital camera having a configuration in which light beams obliquely incident on the filter in the filter frame for the digital camera are not totally reflected by the holding edge portion of the filter lens having the stepped light shielding ring shape. It was formed so that no harmful rays would reach the image sensor. In addition, the present invention can change the shape of the conventional lens holding edge without increasing the thickness, and the filter frame can be made thin, so that vignetting due to the filter frame can be prevented. The problem of moiré, false resolution, and suspicious colors in the video was greatly reduced.

(A) It is principal part sectional drawing explaining this invention. (B) It is a principal part expanded sectional view explaining this invention. (A) It is principal part sectional drawing explaining Example 2. FIG. (B) It is principal part sectional drawing explaining Example 2. FIG. (A) It is a principal part enlarged view explaining Example 3. FIG. (B) It is a principal part enlarged view explaining Example 4. FIG. (A) It is a principal part enlarged view explaining Example 5. FIG. (B) It is a principal part enlarged view explaining Example 6. FIG. (A) It is a principal part enlarged view explaining Example 7. FIG. (B) It is a principal part enlarged view explaining Example 8. FIG. (A) It is an assembly drawing explaining a prior art example. (B) It is principal part sectional drawing explaining a prior art example. (C) It is a principal part enlarged view explaining a prior art example.

The present invention can softly represent an object such as a lens protection filter, a circular polarization filter, a light amount adjustment filter, a light effect filter for providing a special effect, and a subject by means such as screwing on the entire surface of a lens barrel of a digital camera. Various filter frames such as a soft focus filter are mounted, and digital camera filter frames that do not cause moiré, false resolution, and suspicious color in images shot through the functions of each filter are provided. .

  That is, according to the present invention, an image pickup device of a digital camera is configured such that light incident obliquely to the filter in a filter frame for a digital camera is not totally reflected at, for example, the peripheral edge portion of the lens pressing edge portion. This prevents the harmful rays from reaching the screen, and eliminates the problem that the image quality is greatly reduced due to the occurrence of moiré, false resolution, and suspicious colors in the image.

In the configuration of the present invention, when a filter for a digital camera is manufactured by assembling components including a filter outer frame, a filter lens, and a filter lens holding spring, the shape of the holding edge of the filter lens provided on the filter outer frame is the center. It is preferable that a two-step stepped filter holding edge narrowing toward the axis is formed, and the two-step stepped filter holding edge constitutes a light shielding ring.

In addition, a mechanism that prevents the light incident on the filter from being totally reflected at the two-step stair-shaped shading ring is designed to prevent harmful rays from reaching the image sensor of the digital camera. Prevent false resolution and suspicious colors.

Further, according to the configuration of the present invention, when a filter is manufactured by assembling components including a filter outer peripheral frame, a filter lens, and a filter lens pressing spring, the shape of the pressing edge of the filter lens provided on the filter outer peripheral frame is directed toward the central axis. It is also preferable to form a stepped filter holding edge having a plurality of steps that narrows and the plurality of steps have a light shielding ring.

In addition, by adopting a mechanism that does not totally reflect light incident obliquely on the filter at the multistage stepped light-shielding ring part, it has been devised so that harmful light does not reach the image sensor of the digital camera, and moire and It prevents false resolution and suspicious colors.

Further, in the present invention, as an example, when manufacturing a filter by assembling a filter outer frame and a filter lens, and a plurality of stepped filter holding edges, the shape of the holding edge of the filter lens provided on the filter outer frame is It is preferable that a plurality of stepped filter pressing edges narrowing toward the central axis are formed, and the plurality of stepped filter pressing edges constitute a light shielding ring.

The multi-step filter holding edge shading ring is fixed to the filter outer frame with the filter lens sandwiched by a female screw ring provided on the inner diameter of the front surface of the filter outer frame. Because the shading ring made of is an independent part from the filter outer frame, precision processing is easy, and it prevents harmful rays from reaching the image sensor of the digital camera. The present invention provides a filter frame for a digital camera that eliminates the occurrence of suspicious colors.

Thus, the lens pressing edge portion of the filter frame in which the present invention is implemented changes only the shape thereof as described above without greatly changing the thickness of the conventional lens pressing edge. The thickness can be made thin.

  Therefore, according to the present invention, a light beam incident obliquely on the filter in the filter frame for the digital camera is configured not to be totally reflected by the holding edge portion of the filter lens having the stepped light-shielding ring shape. The device was formed so that no harmful rays would reach the device. In addition, the present invention can change the shape of the conventional lens holding edge without increasing the thickness, and the filter frame can be made thin, so that vignetting due to the filter frame can be prevented. Can eliminate the problem of moiré, false resolution, and suspicious colors in the video.

  In the present invention, the configuration in which the light beam obliquely incident on the filter lens is not totally reflected by the pressing edge portion of the step-shaped light shielding ring-shaped filter lens is a filter pressing edge portion that forms the step-shaped light shielding ring, and The shape of the holding edge of the filter lens is a two-step or multi-step staircase that narrows toward the optical axis, and the two-step or multi-step staircase shape is tilted up to 45 degrees above and below the step nose on the tread surface. It is preferable to have a shape with the

  In addition, the configuration in which the light beam obliquely incident on the filter lens is not totally reflected by the holding edge portion of the filter lens having the stepped light shielding ring shape is that the shape of the filter holding edge portion and the holding edge of the filter lens is light. Two-step or multi-step staircase shape that narrows toward the axis, and the two-step or multi-step staircase shape has an inclination within 45 degrees from the stair nose and a warp within 45 degrees at the kick-up part. A shape is preferable.

  Furthermore, the configuration in which the light beam obliquely incident on the filter lens is not totally reflected by the holding edge portion of the filter lens having the stepped light shielding ring shape is that the shape of the filter holding edge portion and the holding edge of the filter lens is as follows. A two-step or multi-step staircase shape that narrows toward the optical axis, and the two-step or multi-step staircase shape portion has an arbitrary inclination from the stair nose at each tread surface portion and the kick-up portion. It is preferable to do.

  The surface finish of the two-step or multi-step staircase-shaped filter presser edge and the filter lens presser edge is applied with a black finish using a rough finish such as pear or sandblast finish. It is preferable that the incoming light beam is not totally reflected.

  FIG. 1A is a main part sectional view for explaining Example 1 of the present invention, and FIG. 1B is an enlarged main part sectional view for explaining Example 1 of the present invention. 1A and 1B, 1 is a filter frame, 2 is a filter outer peripheral frame formed by the filter frame 1, 3 is a filter lens, 4 is a filter lens holding spring, 5 is a lens fitting portion, 6 Is a lens holding edge, and a female screw 9 for screwing another attachment is screwed into the inner inner diameter portion 8 on the incident light side 7 of the filter outer peripheral frame 2, and the filter outer peripheral frame On the camera lens side 10 of FIG. 2, a male screw 11 for screwing the filter outer peripheral frame 2 is screwed on the front surface (not shown) of the camera lens barrel to form a male screw outer cylinder portion 12. .

  Thus, in the first embodiment, the filter lens holding edge having the two-stepped steps 14 a and 14 b that narrow the shape of the lens holding edge 6 of the filter lens 3 provided on the filter outer peripheral frame 2 toward the central axis 13. The lens pressing edge 6 formed as 6 and having the two-step staircases 14 a and 14 b constitutes the light shielding ring 15.

Therefore, even if the light beam incident obliquely on the filter lens 3 in the filter frame 1 for the digital camera of Example 1 is totally reflected by the two-stepped steps 14a and 14b of the lens holding edge 6, for example, Since the total reflected light does not enter the filter lens 3 and the amount of harmful rays reaching the image sensor of the digital camera can be drastically reduced, moire, false resolution, and suspicious colors are generated in the image of the digital camera. It is possible to solve the problem of a significant drop.

In addition, as an application example of the first embodiment, a plurality of steps 14a, 14b, 14c,... (Steps are compared to steps) in which the shape of the holding edge 6 of the filter lens 3 is narrowed toward the central axis 13. Are formed on the lens holding edge 6 having the plurality of steps, and the lens holding edge 6 having the plurality of steps 14a, 14b, 14c. It is also possible.

And when the light shielding ring 15 having a multi-step staircase is configured, the thickness of the lens pressing edge portion 6 can be suppressed to be equal to that of the first embodiment by reducing the stair step and the height. It is possible to finish the filter frame 1 with a thin thickness.

2A is a cross-sectional view of a main part for explaining a second embodiment of the present invention, and FIG. 2B is an enlarged cross-sectional view of a main part for explaining a second embodiment of the present invention. 2A and 2B, 1 is a filter frame, 2 is a filter outer peripheral frame formed by the filter frame 1, 3 is a filter lens, 16 is a filter lens holding edge ring, and 5 is a lens fitting portion. A female thread ring 17 for screwing another attachment is screwed on the inner inner diameter portion 8 on the incident light side 7 of the filter outer peripheral frame 2, and the camera lens side 10 of the filter outer peripheral frame 2 is screwed. Are provided with an edge 18 for fixing the filter lens 3 and a male screw 11 for screwing the filter outer peripheral frame 2 onto the front surface (not shown) of the camera lens barrel. The external thread outer cylinder part 12 is formed.

Thus, in the second embodiment, when the filter outer frame 2 and the filter lens 3 and the stepped filter holding edge ring 16 having a plurality of steps are assembled to manufacture the filter, the filter lens 3 provided on the filter outer frame 2 is pressed. The shape of the edge portion forms a two-step or multiple-step stepped filter holding edge ring 16 that narrows toward the central axis 13, and the plurality of stepped filter holding edge rings 16 constitute a light shielding ring 15. Is.

A light shielding ring 15 comprising a plurality of stepped filter holding edge rings 16 is fixed in the filter outer frame 2 with the filter lens 3 sandwiched by a female screw ring 17 provided on the inner diameter of the front surface of the filter outer frame 2. Since the light shielding ring 15 composed of a plurality of stepped filter holding edge rings 16 is manufactured as a part independent of the filter outer peripheral frame 2, precision processing is easy, and harmful rays reach the image sensor of the digital camera. The present invention provides a filter frame 1 for a digital camera that prevents the occurrence of moiré, false resolution, and suspicious colors in an image.

Incidentally, the filter lens pressing edge ring 16 of the filter frame 1 in the second embodiment can change only the shape thereof as described above without greatly changing the thickness of the conventional lens pressing edge. Can be made as thin as the first embodiment.

  Thus, in the first and second embodiments of the present invention, the light beam obliquely incident on the filter in the filter frame for the digital camera is totally reflected by the holding edge portion of the filter lens having the stepped light shielding ring shape. By adopting a configuration in which the harmful light rays do not reach the image pickup device of the digital camera, it is formed. In addition, the present invention can achieve the shape of the lens pressing edge of the conventional device without increasing the thickness, and the filter frame can be made thin. It is possible to provide a filter frame of a digital camera that can solve the problem that the image quality is greatly deteriorated due to the occurrence of moiré, false resolution, and suspicious colors in the camera image.

  3A is an enlarged cross-sectional view of a main part for explaining a third embodiment of the present invention, and FIG. 3B is an enlarged cross-sectional view of a main part showing an application example of the third embodiment. 3 (A) and 3 (B), 1 is a filter frame, 2 is a filter outer peripheral frame formed by the filter frame 1, 3 is a filter lens, 4 is a filter lens holding spring, 5 is a lens fitting portion, 6 Is a lens holding edge, and a female screw 9 for screwing another attachment is screwed into the inner inner diameter portion 8 on the incident light side 7 of the filter outer peripheral frame 2, and the filter outer peripheral frame On the camera lens side 10 of FIG. 2, a male screw 11 for screwing the filter outer peripheral frame 2 is screwed on the front surface (not shown) of the camera lens barrel to form a male screw outer cylinder portion 12. .

  Thus, in Example 3, the lens holding edge 6 having the two-stepped steps 14 a and 14 b narrowing toward the central axis 13 in the shape of the holding edge 6 of the filter lens 3 provided on the filter outer peripheral frame 2. The two-step staircases 14a and 14b have tread surface portions 19a and 19b, respectively, and the lens holding edge 6 and the two-step staircases 14a and 14b constitute a light shielding ring 15. .

  In Example 3 shown in FIG. 3A, the tread portions 19a and 19b of the two-stage steps 14a and 14b are inclined upward by an angle R from the respective noses, and the angle R is within 45 degrees. Preferably, within the angle R, it can be arbitrarily set at the time of manufacturing the light shielding ring 15 and can sufficiently fulfill the role of the light shielding ring.

  Further, in Example 3 shown in FIG. 3B, the tread portions 19a and 19b of the two-stage steps 14a and 14b are inclined downward by an angle R from the respective noses, and the angle R is within 45 degrees. Preferably, within the angle R, it can be arbitrarily set at the time of manufacturing the light shielding ring 15 and can sufficiently fulfill the role of the light shielding ring.

Thus, in the third embodiment, the surface finish of the two-step or plural-step stepped filter holding edge 6 including the tread portions 19a and 19b and the holding edge ring 16 of the filter lens is made of pear or ground blast. A finish that roughened the surface, such as the finish, was applied with black paint to prevent the incident light from being totally reflected.

  4A is an enlarged cross-sectional view of a main part for explaining a fourth embodiment of the present invention, and FIG. 4B is an enlarged cross-sectional view of a main part showing an application example of the fourth embodiment. 4 (A) and 4 (B), 1 is a filter frame, 2 is a filter outer peripheral frame formed by the filter frame 1, 3 is a filter lens, 4 is a filter lens holding spring, 5 is a lens fitting portion, 6 Is a lens holding edge, and a female screw 9 for screwing another attachment is screwed into the inner inner diameter portion 8 on the incident light side 7 of the filter outer peripheral frame 2, and the filter outer peripheral frame On the camera lens side 10 of FIG. 2, a male screw 11 for screwing the filter outer peripheral frame 2 is screwed on the front surface (not shown) of the camera lens barrel to form a male screw outer cylinder portion 12. .

  Thus, in Example 4, the filter lens holding edge 6 having the two-stepped steps 14a and 14b in which the shape of the holding edge 6 of the filter lens 3 provided on the filter outer peripheral frame 2 is narrowed toward the central axis 13 is obtained. The two-step staircases 14a and 14b have kick-up portions 20a and 20b, respectively, and the filter holding edge 6 and the staircases 14a and 14b constitute a light shielding ring 15.

  In Example 4 shown in FIG. 4 (A), the kick-up portions 20a and 20b of the two-stage steps 14a and 14b are inclined from the respective noses within an angle R, and the angle R is preferably within 45 degrees. If it is within the angle R, it can be arbitrarily set at the time of manufacture of the light shielding ring 15 and can sufficiently fulfill the role of the light shielding ring.

  Further, in Example 4 shown in FIG. 4B, the kick-up portions 20a and 20b of the two-stage steps 14a and 14b are warped within an angle R from the respective noses, and this angle R is within 45 degrees. If it is within the angle R, it can be arbitrarily set when the light shielding ring 15 is manufactured, and the role of the light shielding ring can be sufficiently fulfilled.

Thus, in the fourth embodiment, the surface finish of the two-step or plural-step stepped filter holding edge 6 including the kick-up portions 20a and 20b, and the holding edge ring 16 of the filter lens is made of pear or ground blast. A finish that roughened the surface, such as the finish, was applied with black paint to prevent the incident light from being totally reflected.

  5A is an enlarged cross-sectional view of a main part for explaining a fifth embodiment of the present invention, and FIG. 5B is an enlarged cross-sectional view of a main part showing an application example of the fifth embodiment. 5 (A) and 5 (B), 1 is a filter frame, 2 is a filter outer peripheral frame formed by the filter frame 1, 3 is a filter lens, 4 is a filter lens holding spring, 5 is a lens fitting portion, 6 Is a lens holding edge, and a female screw 9 for screwing another attachment is screwed into the inner inner diameter portion 8 on the incident light side 7 of the filter outer peripheral frame 2, and the filter outer peripheral frame On the camera lens side 10 of FIG. 2, a male screw 11 for screwing the filter outer peripheral frame 2 is screwed on the front surface (not shown) of the camera lens barrel to form a male screw outer cylinder portion 12. .

  Thus, in the fifth embodiment, the filter lens holding edge 6 having the two-stepped steps 14 a and 14 b that narrow the shape of the holding edge 6 of the filter lens 3 provided on the filter outer peripheral frame 2 toward the central axis 13. The two-step staircases 14a and 14b have tread surface portions 19a and 19b and kick-up portions 20a and 20b, respectively, and the filter pressing edge 6 and the staircases 14a and 14b constitute a light shielding ring 15. ing.

  In the fifth embodiment shown in FIG. 5A, the tread portions 19a and 19b of the two-stage steps 14a and 14b are inclined upward from the respective noses, and the kick-up portions 20a and 20b are sled from the respective noses. The respective inclination angles are preferably within 45 degrees in combination with the shape having the shape, and if within that angle, they can be arbitrarily set during the production of the light shielding ring 15 and can sufficiently fulfill the role of the light shielding ring. .

Further, in Example 5 shown in FIG. 5B, the tread portions 19a and 19b of the two-stage steps 14a and 14b are inclined downward from the respective noses, and the kick-up portions 20a and 20b are sled from the respective noses. The angles of the respective inclinations and warps are preferably within 45 degrees, and can be arbitrarily set at the time of manufacturing the light shielding ring 15 and sufficiently fulfill the role of the light shielding ring. be able to.

Thus, in Example 5, the surface finish of the two-step or plural-step stair-shaped filter pressing edge 6 including the tread portions 19a and 19b and the kick-up portions 20a and 20b, and the pressing edge ring 16 of the filter lens is as follows. The surface of the surface such as pear or sand blasting is used to make the surface rough, and black coating is applied so that the incident light beam is not totally reflected. The present invention provides a filter frame for a digital camera. In this configuration, the light beam obliquely incident on the filter lens is not totally reflected by the holding edge portion of the filter lens having the stepped light-shielding ring shape so that the harmful light beam does not reach the image sensor of the digital camera.

In addition, the present invention can change the shape of the conventional lens holding edge without increasing the thickness, and the filter frame can be made thin, so that vignetting due to the filter frame can be prevented. The problem of moiré, false resolution, and suspicious colors in the video was greatly reduced.

DESCRIPTION OF SYMBOLS 1 Filter frame 2 Filter outer peripheral frame 3 Filter lens 4 Filter lens pressing spring 5 Lens fitting part 6 Lens pressing edge part 7 Incident light side 8 Inner inner diameter part 9 Female screw 10 Camera lens side 11 Male screw 12 Male screw outer cylinder part 13 Central shafts 14a, 14b, 14c ... Two-step staircase Multi-step staircase 15 Shading ring 16 Filter lens pressing edge ring 17 Female thread ring 18 Edge portions 19a, 19b Tread surface portions 20a, 20b Kick-up portion

Claims (5)

In the filter frame of a digital camera attached to the front surface of the lens barrel of the digital camera, a filter outer frame 2 having an inner inner diameter portion 8 in which a lens fitting portion 5 to which the filter lens 3 is fitted is formed, and the filter outer frame. 2 and is formed so as to protrude inward from the lens fitting portion 5 in the inner inner diameter portion 8 to the incident light side 7, and from the incident light side 7 to the camera lens side 10. A lens holding edge 6 formed with two or more stepped steps 14 a, 14 b, 14 c... Narrowing toward the central axis 13, which is the optical axis, and the inner inner diameter portion 8. The filter lens 3 is clamped and fixed between a filter lens holding spring 4 provided at a position on the camera lens side 10 from the lens fitting portion 5. Or an edge 18 formed to project inward from the lens fitting portion 5 in the inner inner diameter portion 8 to the position on the camera lens side 10, and from the lens fitting portion 5 in the inner inner diameter portion 8. Steps 14a, 14b, which are arranged at the position of the incident light side 7 and narrow toward the central axis 13 that is the optical axis from the incident light side 7 toward the camera lens side 10; A filter frame of a digital camera, wherein the filter lens 3 is sandwiched and fixed between a filter lens pressing edge ring 16 separate from the filter outer peripheral frame 2 formed with 14c. The filter lens holding edge ring 16 holds the filter lens 3 in the filter outer peripheral frame 2 by a female screw ring 17 provided at a position closer to the incident light side 7 than the filter lens holding edge ring 16 in the inner inner diameter portion 8. The filter frame of the digital camera according to claim 1, wherein the filter frame is fitted. The steps 14a, 14b, 14c,... Of the lens pressing edge 6 and the filter lens pressing edge ring 16 are shaped so as to have an inclination of 45 degrees or less above and below the step nose at the tread portions 19a, 19b. A filter frame for a digital camera according to claim 1 or 2. The steps 14a, 14b, 14c,... Of the lens holding edge 6 and the filter lens holding edge ring 16 have a shape with an inclination within 45 degrees and a warp within 45 degrees with respect to the step nose at the raised portions 20a, 20b. 3. A filter frame for a digital camera according to claim 1, wherein the filter frame is a digital camera filter frame. The steps 14a, 14b, 14c,... Of the lens pressing edge 6 and the filter lens pressing edge ring 16 have an arbitrary inclination from the step nose at the respective tread portions 19a, 19b and the kick-up portions 20a, 20b. 3. A filter frame for a digital camera according to claim 1, wherein the filter frame is a digital camera filter frame.

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