JP2014032224A - Filter frame for digital camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter frame which prevents vignetting phenomenon from occurring when being attached to a camera lens barrel front face of a zoom lens and a wide angle lens.SOLUTION: This invention provides a filter frame wherein an adaptor frame is attached to a lens barrel foremost part of a digital camera, and a thin filter frame of a large diameter can be simply and easily attached to or detached from the camera lens barrel front face through the adaptor frame.

Description

The present invention holds various filter lenses such as an infrared (UV) cut filter, a neutral density (ND) filter, a soft effect filter, a spot effect filter, and a streak effect filter mounted on the front surface of a lens barrel of a digital camera. The present invention relates to a filter frame developed for mounting on the front surface of a lens barrel.

The present invention particularly has a configuration in which an adapter frame is attached to the front surface of a lens barrel of a digital camera, and the filter frame can be easily and easily attached to and detached from the front surface of the camera lens barrel via the adapter frame. The filter frame provides a filter frame that does not cause vignetting even when mounted on the front surface of a digital camera zoom lens or wide-angle lens barrel.

Recently, digital single-lens reflex cameras have made it possible to take pictures while pursuing their operability while directly confirming the effects of using various filter lenses on the viewfinder and LCD monitor. In addition, many new products with a view rate close to 100% have been commercialized in finders and liquid crystal monitors.

Thus, according to the present invention, the adapter frame is mounted on the front surface of the lens barrel of the latest digital camera, and each filter frame holding various filter lenses via the adapter frame is easily mounted on the front surface of the camera lens barrel. The filter frame has a configuration that can be easily mounted or removed, and the filter frame provides a filter frame that does not cause vignetting even when mounted on the front surface of a zoom lens of a digital camera or a wide-angle lens.

On the front side of the lens barrel of the digital camera, that is, on the foremost inner diameter side of the lens barrel, a female screw is screwed in order to attach various types of filters, hoods, and other photographic lens attachments. A male screw is screwed on the attachment mounting side of the filter and hood, and the attachment such as the filter and hood is mounted by screwing the female screw and the male screw.

Thus, the attachment / detachment mechanism for screwing the filter or the like with the screw portion including the female screw and the male screw has the following drawbacks. That is, the initial fitting operation of screwing the male screw of the filter frame to the female screw screwed at the forefront of the camera lens barrel is surprisingly troublesome, and requires a unique intuition and operational familiarity. In addition, since the thread pitch of the thread portion is fine, it is necessary to rotate the filter frame to be mounted many times to mount it at a predetermined position.

Therefore, if the fitting operation of the first male screw and female screw is mistaken, the screw thread screwed on the lens barrel and the filter frame may be broken, and the screw portion is a screw screwing operation. For this reason, if the screwing at a predetermined position is mistakenly adjusted, the screw parts are pressed and screwed together, and there is a drawback that it is difficult to remove. There is an invention of No. 109719 (hereinafter referred to as Patent Document 1).

The invention of Patent Document 1 provides a filter frame attaching / detaching mechanism that can be easily and easily attached and detached with one touch, and includes an insertion portion formed integrally with a filter outer frame sandwiching a filter. The attachment portion has an outer diameter that can be inserted into the female screw portion on the innermost side of the front lens barrel of the photographing lens of the camera, and a spring fitting groove is formed on the outer peripheral portion of the insertion portion. A ring-shaped spring having a ring shape and a notch at one location is fitted into the spring-fitting groove engraved on the outer peripheral part of the insertion part, The insertion portion of the filter is inserted into the front inner diameter side of the photographing lens barrel of the camera by utilizing the circumferential spring action in the spring fitting groove through the notch portion. When worn, the ring spring works and engages inside the front And filter are mounted on the taking lens barrel forefront, removal of the filter is configured to pull-out with force against the pressing force of the ring spring of the insertion portion.

The invention of Patent Document 1 uses a ring-type spring to insert the filter frame into the female screw portion on the innermost front side of the camera lens barrel. A lens attachment attaching / detaching mechanism for a camera is provided.

However, the invention of Patent Document 1 mounts a filter or other attachment using a filter screwed on the foremost inner diameter side of a camera lens barrel or a female thread portion for mounting other attachment. However, the mechanism for inserting the ring-type spring into the female screw portion has a drawback in that the thread of the female screw portion is worn over many years and the tip of the lens barrel is damaged.

Thus, the filter frame for a digital camera has a thin shape that does not easily cause vignetting even when mounted on a wide-angle lens, and is easy to attach and detach to the digital camera while the filter frame is thin. An invention of a filter frame is disclosed in Japanese Patent Application Laid-Open No. 2005-301173 (hereinafter referred to as Patent Document 2).

Patent Document 2 discloses a lens mirror in which a female screw portion for screw connection of another optical system attachment is provided on the front surface (incident light side) of a filter outer frame on which various filter lenses are fitted, and the female screw outer cylinder side is mounted. It has a shape that protrudes slightly to the front from the tube, and has a male threaded part that is screwed into the camera barrel behind the filter outer frame, and the filter lens is arranged as far back as possible. It is arranged in the camera barrel together with the external thread outer cylinder that the external thread constitutes. With this configuration, when the filter frame is mounted on the forefront of the lens barrel, the filter frame is incident on the forefront of the lens barrel. The thickness protruding to the light side can be reduced, and the vignetting phenomenon caused by the thickness of the filter frame and the shape of the edge of the filter lens frame is prevented.

However, the invention of Patent Document 2 arranges the filter lens as far back as possible in order to prevent the vignetting phenomenon. In the conventional filter frame, there is not enough room to arrange the filter lens behind in dimension. However, it is difficult to provide a thin filter, and the vignetting phenomenon cannot be reliably prevented.

In addition, in the invention of Patent Document 2, the method of attaching the filter frame attached to the foremost inner diameter side of the photographing lens barrel of the camera is based on a female screw and a filter frame screwed on the foremost inner diameter side of the lens barrel. Because it is a screw type that is performed by screwing with a male screw that is screwed, it requires a unique intuition and familiarity with operation, and if the screwing is mistaken, the screw parts will be crimped together and difficult to remove Had the disadvantage of

JP 2004-109719 A JP 2005-301173 A

Thus, the present invention can be applied to various types such as an infrared (UV) cut filter, a neutral density (ND) filter, a soft effect filter, a spot effect filter, a light effect filter, and the like attached to the front surface of a lens barrel of a digital camera. The present invention relates to a filter frame developed to hold a filter lens and attach it to the forefront of a lens barrel.

The problem to be solved by the present invention has been made in view of the inventions of Patent Document 1 and Patent Document 2, and an adapter frame is attached to the forefront of a lens barrel of a digital camera, and a filter is passed through the adapter frame. The frame has a structure that can be easily and easily attached to and removed from the front of the camera lens barrel. The filter frame does not cause vignetting even when attached to the front of the digital camera zoom lens or wide-angle lens barrel. A filter frame is provided.

In the present invention, the ring-shaped adapter frame that is attached to the outermost part of the lens barrel frontmost part of the digital camera and can be fixed to the frontmost part of the lens barrel covers the outer diameter of the frontmost part of the lens barrel. The outer diameter of the ring-shaped adapter frame is increased, and a filter frame engaging protrusion and a groove are provided on the outer periphery of the ring-shaped adapter frame. Further, on the opposite surface of the filter frame to be mounted on the adapter frame, there are a filter frame mounting portion containing a filter frame engaging projection on the adapter frame and an inner diameter projection that fits into the groove, and a filter frame main body for sandwiching the filter lens. The filter frame mounting part of the filter frame body is configured to be capped so as to cover the outer diameter of the lens barrel frontmost part, and the filter lens aperture of the filter frame is made larger than the aperture of the lens barrel frontmost part. The filter frame engaging protrusion and groove of the adapter frame are fitted to the inner diameter protrusion of the filter frame mounting portion of the filter frame, and a digital camera having a structure in which a filter frame having a large aperture is detachably mounted on the front surface of the adapter frame. A filter frame is provided.

Further, in the embodiment of the present invention, the shape of the projection for engaging the filter frame and the groove provided on the outer periphery of the outer diameter of the adapter frame is a semicircular cross-section of the protrusion and the recess provided on the outer periphery of the outer diameter of the adapter frame. This is a combination of grooves, and the filter frame engaging projection provided on the outer periphery of the adapter frame outer diameter portion and the inner diameter projection of the filter frame mounting portion that fits into the groove portion are projections having a semicircular cross section. The present invention provides a filter frame for a digital camera that continuously protrudes around the entire circumference of the inner diameter portion or has two or three partially protruded inner diameter portion protrusions.

Furthermore, in another embodiment of the present invention, the shape of the filter frame engaging protrusion and the groove provided on the outer periphery of the adapter frame outer diameter portion is related to the protrusion having a tapered section provided on the outer periphery of the adapter frame outer diameter portion. It is a combination of joint grooves, and it continuously protrudes all around the outer diameter part of the adapter frame or is composed of two or three partially protruding outer diameter protrusions, and the outer periphery of the adapter frame outer diameter part The taper-shaped projection provided above and the inner-diameter portion of the filter frame mounting portion that fits into the engagement groove are semi-circular cross-section projections that protrude continuously from the entire inner periphery of the filter frame mounting portion. A filter frame for a digital camera having protrusions is provided.

The adapter frame and the filter frame mounting portion and the filter frame main body constituting the present invention are manufactured by a polymer elastic body having elasticity in whole or in part, and the filter frame main body includes various filter lenses as filter main body portions. It provides a filter frame for a digital camera that is sandwiched between.

Thus, according to the present invention, a ring-shaped adapter frame that can be fixed to the forefront of the lens barrel of a digital camera is mounted, and a filter frame engaging projection and a groove are formed on the outer periphery of the outer diameter of the ring-shaped adapter frame. The filter frame mounting portion and the filter lens having a built-in inner-diameter projection that fits into the groove portion are sandwiched between the filter frame engaging projection portion of the adapter frame and the filter frame mounting surface on the opposite surface of the filter frame mounted on the adapter frame. A filter frame main body is provided, and a filter frame for a digital camera can be provided in which the filter frame can be easily attached to and detached from the front surface of the camera lens barrel via the adapter frame.

Further, in the present invention, the ring-shaped adapter frame that can be fixed to the foremost part of the lens barrel covers the outer diameter of the foremost part of the lens barrel and adds the aperture of the foremost part of the lens barrel to make the outer diameter part larger. A filter frame mounting portion formed to cover the adapter frame outer diameter portion is attached to the ring-shaped adapter frame outer diameter portion, and a filter frame main body for holding a filter lens is integrally formed on the front surface of the filter frame mounting portion. In this configuration, by attaching a filter frame body with a large aperture to the front surface of the adapter frame, the filter frame body having the large diameter can be attached to the front surface of a digital camera zoom lens or wide-angle lens barrel. The filter frame does not cause vignetting.

In the present invention, the adapter frame, the filter frame mounting portion, and the filter frame main body are manufactured entirely or partially from a polymer elastic body having elasticity, and the filter frame main body includes various filter lenses at the filter main body portion. The thickness of the filter lens main body because it does not require assembly parts such as a screw mechanism for attaching the filter frame, a filter lens holding edge, and a filter fixing frame, as compared to the conventional filter frame mechanism. As with the case of obtaining the large-diameter filter frame main body, it is possible to shoot without vignetting even when the zoom lens of a digital camera or the lens barrel of a wide-angle lens is mounted.

(A) Assembly drawing explaining Example 1 of this invention. (B) Main part sectional drawing explaining Example 1 of this invention. (A) The perspective sectional view explaining the component of Example 1. FIG. (B) FIG. 2 (A) AA direction side view of Example 1. FIG. (A) Assembly drawing explaining Example 2 of this invention. (B) Main part sectional drawing explaining Example 2 of this invention. (A) FIG. 3 (A) BB side view of Example 2. FIG. (B) FIG. 3 (A) CC direction side sectional drawing of Example 2. FIG.

Thus, the present invention can be applied to various types such as an infrared (UV) cut filter, a neutral density (ND) filter, a soft effect filter, a spot effect filter, a light effect filter, and the like attached to the front surface of a lens barrel of a digital camera. The present invention relates to a filter frame developed to hold a filter lens and attach it to the forefront of a lens barrel.

The problem to be solved by the present invention has been made in view of the inventions of Patent Document 1 and Patent Document 2, and an adapter frame is attached to the forefront of a lens barrel of a digital camera, and a filter is passed through the adapter frame. The frame has a structure that can be easily and easily attached to and removed from the front of the camera lens barrel. The filter frame does not cause vignetting even when attached to the front of the digital camera zoom lens or wide-angle lens barrel. A filter frame is provided.

In the present invention, the ring-shaped adapter frame that is attached to the outermost part of the lens barrel frontmost part of the digital camera and can be fixed to the frontmost part of the lens barrel covers the outer diameter of the frontmost part of the lens barrel. The outer diameter of the ring-shaped adapter frame is increased, and a filter frame engaging protrusion and a groove are provided on the outer periphery of the ring-shaped adapter frame. Further, on the opposite surface of the filter frame to be mounted on the adapter frame, there are a filter frame mounting portion containing a filter frame engaging projection on the adapter frame and an inner diameter projection that fits into the groove, and a filter frame main body for sandwiching the filter lens. The filter frame mounting part of the filter frame body is configured to be capped so as to cover the outer diameter of the lens barrel frontmost part, and the filter lens aperture of the filter frame is made larger than the aperture of the lens barrel frontmost part. The filter frame engaging protrusion and the groove of the adapter frame are preferably fitted to the inner diameter protrusion of the filter frame mounting portion of the filter frame so that the filter frame having a large aperture is detachably mounted on the front surface of the adapter frame.

Further, in the embodiment of the present invention, the shape of the projection for engaging the filter frame and the groove provided on the outer periphery of the outer diameter of the adapter frame is a semicircular cross-section of the protrusion and the recess provided on the outer periphery of the outer diameter of the adapter frame. This is a combination of grooves, and the filter frame engaging projection provided on the outer periphery of the adapter frame outer diameter portion and the inner diameter projection of the filter frame mounting portion that fits into the groove portion are projections having a semicircular cross section. It is preferable that the inner peripheral portion protrudes continuously around the entire circumference of the inner diameter portion, or has two or three partially protruded inner diameter portion protrusions.

Furthermore, in another embodiment of the present invention, the shape of the filter frame engaging protrusion and the groove provided on the outer periphery of the adapter frame outer diameter portion is related to the protrusion having a tapered section provided on the outer periphery of the adapter frame outer diameter portion. It is a combination of joint grooves, and it continuously protrudes all around the outer diameter part of the adapter frame or is composed of two or three partially protruding outer diameter protrusions, and the outer periphery of the adapter frame outer diameter part The taper-shaped projection provided above and the inner-diameter portion of the filter frame mounting portion that fits into the engagement groove are semi-circular cross-section projections that protrude continuously from the entire inner periphery of the filter frame mounting portion. It is preferable to have a protrusion.

The adapter frame and the filter frame mounting portion and the filter frame main body constituting the present invention are manufactured by a polymer elastic body having elasticity in whole or in part, and the filter frame main body includes various filter lenses as filter main body portions. The structure clamped by is preferable.

Thus, according to the present invention, a ring-shaped adapter frame that can be fixed to the forefront of the lens barrel of a digital camera is mounted, and a filter frame engaging projection and a groove are formed on the outer periphery of the outer diameter of the ring-shaped adapter frame. The filter frame mounting portion and the filter lens having a built-in inner-diameter projection that fits into the groove portion are sandwiched between the filter frame engaging projection portion of the adapter frame and the filter frame mounting surface on the opposite surface of the filter frame mounted on the adapter frame. A filter frame main body is provided, and a filter frame for a digital camera can be provided in which the filter frame can be easily attached to and detached from the front surface of the camera lens barrel via the adapter frame.

Further, in the present invention, the ring-shaped adapter frame that can be fixed to the foremost part of the lens barrel covers the outer diameter of the foremost part of the lens barrel and adds the aperture of the foremost part of the lens barrel to make the outer diameter part larger. A filter frame mounting portion formed to cover the adapter frame outer diameter portion is attached to the ring-shaped adapter frame outer diameter portion, and a filter frame main body for holding a filter lens is integrally formed on the front surface of the filter frame mounting portion. In this configuration, by attaching a filter frame body with a large aperture to the front surface of the adapter frame, the filter frame body having the large diameter can be attached to the front surface of a digital camera zoom lens or wide-angle lens barrel. The filter frame does not cause vignetting.

In the present invention, the adapter frame, the filter frame mounting portion, and the filter frame main body are manufactured entirely or partially from a polymer elastic body having elasticity, and the filter frame main body includes various filter lenses at the filter main body portion. The thickness of the filter lens main body because it does not require assembly parts such as a screw mechanism for attaching the filter frame, a filter lens holding edge, and a filter fixing frame, as compared to the conventional filter frame mechanism. As with the case of obtaining the large-diameter filter frame main body, it is possible to shoot without vignetting even when the zoom lens of the digital camera or the lens barrel of the wide-angle lens is mounted.

1A is an assembly diagram for explaining the first embodiment of the present invention, FIG. 1B is a cross-sectional view of a main part for explaining the first embodiment of the present invention, and FIG. FIG. 2B is a side view in the AA direction in FIG. 2A of the first embodiment.

1 and 2, reference numeral 1 denotes a lens barrel of a digital camera, 2 denotes an adapter frame that forms a member of the present invention, 3 denotes a filter frame that similarly forms a member of the present invention, and the filter frame 3 is a filter frame. The filter frame 3 is formed from the frame mounting portion 4 and the filter frame main body 5, and the filter frame 3 is arranged on the optical axis C as shown in FIG. 1A and 1B, reference numeral 6 denotes a filter lens, 7 denotes a lens barrel side, and 8 denotes an incident light side.

Thus, a female screw 11 for mounting an attachment such as a filter or a hood is screwed on the inner diameter portion 10 of the lens barrel frontmost portion 9 of the lens barrel 1 of the digital camera. Further, the ring-shaped adapter frame 2 fixed to the female barrel 11 via the male screw 12 on the lens barrel frontmost portion 9 covers the outer diameter of the lens barrel frontmost portion 9 and the diameter of the lens barrel frontmost portion 9. Is added to increase the diameter of the outer diameter portion 13, and a filter frame engaging projection 14 and a groove 15 are provided on the outer periphery of the outer diameter portion 13 of the ring-shaped adapter frame 2.

In addition, a filter frame engaging projection 14 of the adapter frame 2 and an inner diameter projection 17 (or 17a, 17b) that fits into the groove 15 are built in the opposing surface 16 of the filter frame 3 attached to the adapter frame 2. The filter frame mounting portion 4 and the filter frame main body 5 sandwiching the filter lens 6 are integrated, and the filter frame mounting portion 4 of the filter frame main body 5 covers the outer diameter portion 13 of the lens barrel frontmost portion 9. In this configuration, the aperture of the filter lens 6 of the filter frame 3 is formed larger than the aperture of the lens barrel frontmost portion 9, and the filter frame engaging projection 14 and the groove 15 of the adapter frame 2 are The filter frame 3 having a large diameter can be detachably attached to the front surface of the adapter frame 2 by fitting to the inner diameter protrusion 17 of the filter frame mounting portion 4 of the filter frame 3. It is intended to wear.

The shape of the projection 14 for engaging the filter frame and the groove 15 provided on the outer periphery of the outer diameter portion 13 of the adapter frame 2 is a protrusion having a semicircular cross section provided on the outer periphery of the outer diameter portion 13 of the adapter frame 2. The filter frame engaging protrusion 14 of the adapter frame 2 and the inner diameter protrusion 17 of the filter frame mounting portion 4 that fits into the groove 15 are semicircular cross-sectional protrusions. Or may be configured as two upper and lower inner diameter protrusions 17a and 17b as shown in FIGS. 2 (A) and 2 (B). 17a, 17b, and 17c (not shown) may be protrusions of an inner diameter part that partially protrudes in about three places.

The filter frame 3 is attached to the adapter frame 2 by attaching the filter frame provided on the filter frame 3 to the filter frame engaging projection 14 and the groove 15 provided on the outer periphery of the outer diameter portion 13 of the adapter frame 2. The inner diameter protrusion 17 of the portion 4 is fitted with a click feeling, and the attachment / detachment operation supports the adapter frame 2 and pulls the filter frame 3 to the incident light side 8. The operation of detaching the filter frame 3 from the adapter frame 2 can be easily performed because the filter frame mounting portion 4 is made of an elastic polymer having elasticity.

Thus, in the first embodiment, the ring-shaped adapter frame 2 that can be fixed to the lens barrel frontmost portion 9 of the digital camera is mounted, and a filter is disposed on the outer periphery of the outer diameter portion 13 of the ring-shaped adapter frame 2. A frame engaging projection 14 and a groove 15 are provided, and an inner diameter of the filter frame engaging projection 14 and the groove 15 of the adapter frame 2 is fitted to the opposing surface 16 of the filter frame 3 attached to the adapter frame 2. A filter frame mounting part 4 having a built-in protrusion 17 and a filter frame main body 5 for holding the filter lens 6 are provided, and the filter frame 3 is attached to the front of the lens barrel of the camera lens barrel 1 via the adapter frame 2. 9 can provide a filter frame for a digital camera that can be easily and easily attached and detached.

In the first embodiment, the ring-shaped adapter frame 2 that can be fixed to the lens barrel frontmost portion 9 covers the outer diameter of the lens barrel frontmost portion 9 and adds the aperture of the lens barrel frontmost portion 9 to the outer diameter. A filter frame mounting portion 4 formed so as to cover the outer diameter portion 13 of the adapter frame 2 is mounted on the outer diameter portion 13 of the ring-shaped adapter frame 2. The filter frame main body 5 that sandwiches the filter lens 6 is integrated with the front surface (incident light side 8) of the unit 4, and the filter frame main body 5 having a large aperture is arbitrarily attached to the front surface of the adapter frame 2. Therefore, the filter frame body 5 having the large aperture becomes a filter frame that does not cause vignetting even when mounted on the front surface of the zoom lens 1 or the wide-angle lens barrel 1 of the digital camera.

In the first embodiment, the adapter frame 2, the filter frame mounting portion 4 and the filter frame main body 5 are all or partly made of a polymer elastic body having elasticity, and the filter frame main body 5 includes various filter lenses. Since it is clamped by the filter body 5, compared to the conventional filter frame mechanism, assembly parts such as a filter mechanism mounting screw mechanism, filter lens holding edge, and filter fixing frame are not required. Since the thickness T of 5 can be made thin, this is the same as that for obtaining the large-diameter filter frame body 5 and is attached to the front surface of the zoom lens of the digital camera or the lens barrel 1 of the wide-angle lens. It is possible to shoot without vignetting.

3A is an assembly diagram for explaining the second embodiment of the present invention, FIG. 3B is a cross-sectional view for explaining the main portion of the second embodiment of the present invention, and FIG. FIG. 4B is a side view in the BB direction in FIG. 3A, and FIG. 4B is a side view in the CC direction in FIG.

3 and 4, 1 is a lens barrel of a digital camera, 2 is an adapter frame forming the member of the present invention, 3 is a filter frame similarly constituting the member of the present invention, and the filter frame 3 is a filter frame. The filter frame 3 is formed from the frame mounting portion 4 and the filter frame main body 5, and the filter frame 3 is arranged on the optical axis C as shown in FIG. 3A and 3B, 6 indicates a filter lens, 7 indicates a lens barrel side, and 8 indicates an incident light side.

Thus, a ring-shaped adapter frame 2 fixed by screws 18a and 18b can be attached to the lens barrel frontmost portion 9 of the lens barrel 1 of the digital camera, and the adapter frame 2 is located at the front of the lens barrel. The outer diameter of the portion 9 is covered and the diameter of the lens barrel frontmost portion 9 is added to increase the diameter of the outer diameter portion 13. On the outer periphery of the outer diameter portion 13 of the ring-shaped adapter frame 2 The protrusion 19 and the engagement groove 20 having a tapered cross section are provided, and the protrusion 19 and the engagement groove 20 having a tapered cross section project continuously from the entire circumference of the outer diameter portion 13 of the adapter frame 2. Or, as shown in FIG. 4A, the taper protrusions 19a, 19b, 19c and the engaging grooves 20a, 20b, 20c are arranged at three equally divided locations on the circumference.

The inner diameter protrusion 21 of the filter frame mounting portion 4 provided on the outer periphery of the outer diameter portion 13 of the adapter frame 2 is a protrusion having a semicircular cross section and continues to the entire circumference of the inner diameter portion 10 of the filter frame mounting portion 4. It is the inner diameter part protrusion 20 which protruded.

Thus, the configuration of the second embodiment is such that the shape of the projection 14 for engaging the filter frame provided on the outer periphery of the outer diameter portion 13 of the adapter frame 2 is a cross section provided on the outer periphery of the outer diameter portion 13 of the adapter frame 2. Is a combination of tapered projections 19a, 19b, 19c and engagement grooves 20a, 20b, 20c, and continuously protrudes from the entire circumference of the outer diameter portion 13 of the adapter frame 2, or from two to three locations. It is composed of an outer diameter protrusion that partially protrudes (as shown in FIG. 4 (A)), and is provided on the outer periphery of the outer diameter section 13 of the adapter frame 2 with tapered protrusions 19a, 19b, 19c; The inner diameter protrusion 21 of the filter frame mounting portion 4 that fits into the engaging grooves 20a, 20b, and 20c is a protrusion having a semicircular cross section and continuously protrudes from the entire circumference of the inner diameter portion 10 of the filter frame mounting portion 4. Consists of projections 21 To have.

4A is provided with cam engagement grooves 22a, 22b, and 22c that are equally arranged on the incident light side 8 of the adapter frame 2. The cam engagement grooves 22a, 22b, The cam protrusions 24a, 24b, and 24c provided on the inner wall edge 23 of the filter frame 4 when the filter frame mounting portion 4 is mounted are engaged with 22c as shown in FIG. 3B. Therefore, when the filter frame 3 attached to the adapter frame 2 is detached from the adapter frame 2, the cam protrusions 24a, 24b, 24c are attached to the adapter frame 2 by rotating the filter frame 3 about the optical axis C. By sliding in the cam engagement grooves 22a, 22b, and 22c provided, the cam protrusions 24a, 24b, and 24c move to positions on the outer diameter portion 13 from the cam engagement grooves 22a, 22b, and 22c, respectively. Then, the filter frame mounting portion 4 is expanded to release the inner diameter protrusion 21 from the tapered protrusions 19a, 19b, 19c and the engaging grooves 20a, 20b, 20c, and the filter frame 3 is detached from the adapter frame 2. .

Further, the filter frame 3 is attached to the adapter frame 2 with tapered protrusions 19, 19a, 19b, 19c provided on the outer periphery of the outer diameter portion 13 of the adapter frame 2 and engagement grooves 20.20a, 20b, The inner diameter projection 21 of the filter frame mounting portion 4 provided on the filter frame 3 is fitted with a “click” feeling in a click, and the filter frame 3 is detached from the adapter frame 2. The operation is performed by the combination of the cam engagement grooves 22a, 22b, 22c and the cam projections 24a, 24b, 24c as described above, and the filter frame mounting portion 4 as the detaching operation portion has elasticity. It can be easily done by being manufactured by.

Thus, in the second embodiment, the ring-shaped adapter frame 2 that can be fixed to the lens barrel frontmost portion 9 of the digital camera is mounted, and a taper is formed on the outer periphery of the outer diameter portion 13 of the ring-shaped adapter frame 2. Projections 19, 19 a, 19 b, 19 c and engaging grooves 20, 20 a, 20 b, 20 c are provided, and the opposing surface 16 of the filter frame 3 attached to the adapter frame 2 is tapered on the adapter frame 2. A filter frame mounting portion 4 containing a projection 19, 19 a, 19 b, 19 c and an inner diameter projection 21 that fits into the engaging grooves 20, 20 a, 20 b, 20 c and a filter frame body 5 that sandwiches the filter lens 6 are provided. The filter frame 3 can be easily and easily attached to and detached from the lens barrel frontmost part 9 of the camera lens barrel 1 via the adapter frame 2. It is possible to provide a Luther frame.

In the second embodiment, the ring-shaped adapter frame 2 that can be fixed to the lens barrel frontmost part 9 covers the outer diameter of the lens barrel frontmost part 9 and adds the aperture of the lens barrel frontmost part 9 to the outer diameter. A filter frame mounting portion 4 formed so as to cover the outer diameter portion 13 of the adapter frame 2 is mounted on the outer diameter portion 13 of the ring-shaped adapter frame 2. The filter frame main body 5 that sandwiches the filter lens 6 is integrated with the front surface (incident light side 8) of the unit 4, and the filter frame main body 5 having a large aperture is arbitrarily attached to the front surface of the adapter frame 2. Therefore, the filter frame main body 5 having the large aperture becomes a filter frame that does not cause vignetting even when mounted on the front surface of the zoom lens 1 or the wide-angle lens barrel 1 of the digital camera.

In the second embodiment, the adapter frame 2, the filter frame mounting portion 4, and the filter frame main body 5 are manufactured entirely or partially from a polymer elastic body having elasticity, and the filter frame main body 5 is made of various filter lenses. Since the filter body 5 is sandwiched between the filter body 5 and the conventional filter frame mechanism, assembly parts such as a filter frame mounting screw mechanism, a filter lens holding edge, and a filter fixing frame are not required. Since the thickness T of the main body 5 can be made thin, this is attached to the front surface of the zoom lens of the digital camera or the lens barrel 1 of the wide-angle lens in the same manner as obtaining the large-diameter filter frame main body 5. Even so, shooting without vignetting is possible.

DESCRIPTION OF SYMBOLS 1 Lens barrel 2 Adapter frame 3 Filter frame 4 Filter frame mounting part 5 Filter frame main body 6 Filter lens 7 Lens barrel side 8 Incident light side 9 Lens barrel frontmost part 10 Inner diameter part 11 Female screw 12 Male screw 13 Outer diameter part 14 Filter frame engaging projection 15 Groove 16 Opposing surfaces 17, 17a, 17b, 17c Inner diameter projection 18a, 18b Screws 19, 19a, 19b, 19c Tapered projection 20, 20a, 20b, 20c Engaging groove
21 Inner diameter projections 22a, 22b, 22c Cam engagement groove 23 Inner wall edge portions 24a, 24b, 25c Cam projection C Optical axis T Filter body thickness

Thus, a female screw 11 for mounting an attachment such as a filter or a hood is screwed on the inner diameter portion 10 of the lens barrel frontmost portion 9 of the lens barrel 1 of the digital camera. The ring-shaped adapter frame 2 that is fixed to the female lens 11 via the male screw 12 on the lens barrel frontmost part 9 has a shape that covers the outer diameter of the lens barrel frontmost part 9, and the adapter frame 2. The outer diameter portion 13 of the ring-shaped adapter frame 2 has a large diameter, and a filter frame engaging projection 14 and a groove portion 15 are provided on the outer periphery of the outer diameter portion 13 of the ring-shaped adapter frame 2.

Further, in the first embodiment, the ring-shaped adapter frame 2 that can be fixed to the lens barrel frontmost portion 9 has a shape that covers the outer diameter of the lens barrel frontmost portion 9, and the outer diameter portion 13 of the adapter frame 2. has increased constitute a diameter, the filter frame mounting portion 4 formed so as to cover the outer diameter portion 13 of the adapter frame 2 to the outer diameter portion 13 of the adapter frame 2 of the ring shape is mounted, the filter frame mounting portion The filter frame main body 5 that sandwiches the filter lens 6 is integrated with the front surface (incident light side 8) of No. 4, and the filter frame main body 5 having a large aperture is arbitrarily attached to the front surface of the adapter frame 2. Therefore, the filter frame body 5 having the large aperture becomes a filter frame that does not cause vignetting even when mounted on the front surface of the zoom lens 1 or the wide-angle lens barrel 1 of the digital camera.

Thus, a ring-shaped adapter frame 2 fixed by screws 18a and 18b can be attached to the lens barrel frontmost portion 9 of the lens barrel 1 of the digital camera, and the adapter frame 2 is located at the front of the lens barrel. The outer diameter portion 13 of the adapter frame 2 is configured to have a shape that covers the outer diameter of the portion 9 and the diameter of the outer diameter portion 13 of the adapter frame 2 is increased. A projection 19 and an engagement groove 20 are provided, and the projection 19 and the engagement groove 20 having a tapered cross section project continuously from the entire circumference of the outer diameter portion 13 of the adapter frame 2 or As shown in FIG. 4 (A), taper protrusions 19a, 19b, 19c and engagement grooves 20a, 20b, 20c are arranged and provided at three equally divided locations on the circumference.

Claims (4)

A ring-shaped adapter frame that is attached to the outer diameter of the front lens barrel of the digital camera and can be fixed to the front of the lens barrel covers the outer diameter of the front of the lens barrel and adds the diameter of the front of the lens barrel. In addition, the outer diameter of the ring-shaped adapter frame is increased, and a filter frame engaging projection and a groove are provided on the outer periphery of the ring-shaped adapter frame. The filter frame mounting portion that incorporates the filter frame engaging protrusion of the adapter frame and the inner diameter protrusion that fits into the groove and the filter frame body that sandwiches the filter lens are integrated, and the filter frame mounting portion of the filter frame body Is configured to cover the outer diameter of the lens barrel frontmost part so that the diameter of the filter lens of the filter frame is larger than the diameter of the lens barrel frontmost part. The filter frame engaging protrusion and groove of the adapter frame are fitted to the inner diameter protrusion of the filter frame mounting portion of the filter frame, and a filter frame having a large aperture is detachably mounted on the front surface of the adapter frame. Filter frame for digital cameras. The shape of the protrusion and groove for engaging the filter frame provided on the outer periphery of the adapter frame outer diameter portion is a combination of a semicircular cross-sectional protrusion and a recess groove provided on the outer periphery of the adapter frame outer diameter portion. The projection for engaging the filter frame provided on the outer periphery of the filter part and the projection on the inner diameter of the filter frame mounting part that fits into the groove part are semicircular projections that protrude continuously from the entire circumference of the inner diameter part of the filter frame mounting part. The filter frame for a digital camera according to claim 1, wherein the filter frame is a protruding part of an inner diameter part that protrudes from about two to three parts. The shape of the filter frame engaging protrusion and groove provided on the outer periphery of the adapter frame outer diameter portion is a combination of a tapered cross-sectional protrusion provided on the outer periphery of the adapter frame outer diameter portion and the engaging groove, and the adapter frame outer diameter. Consists of two or three partially protruding outer diameter protrusions that protrude continuously around the entire circumference of the section, and engage with tapered protrusions provided on the outer periphery of the adapter frame outer diameter section The inner diameter protrusion of the filter frame mounting portion that fits into the groove is a protrusion having a semicircular cross section, and is an inner diameter protrusion protruding continuously around the entire circumference of the inner diameter portion of the filter frame mounting portion. Filter frame for digital cameras described in 1. The adapter frame, the filter frame mounting portion, and the filter frame main body are manufactured entirely or partially from a polymer elastic body having elasticity, and the filter frame main body sandwiches various filter lenses by the filter main body. The filter frame for a digital camera according to any one of claims 1 to 3.

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