JP5524383B1 - Filter frame for digital cameras - Google Patents

Abstract

An object of the present invention is to provide a thin filter frame and to provide a filter frame that is not easily vignetted.
An annular filter frame main body is substantially bisected to form an incident light side as a front frame and a camera lens barrel side as a rear frame, and a filter lens is held inside the joint surface between the front frame and the rear frame. A ring lens is provided protruding toward the optical axis, and a filter lens fitting inner frame protruding in a T-shape or L-shape is provided at the tip of the filter lens holding ring, and the filter lens fitting inner frame A filter lens was fitted, the filter lens was held by an annular edge provided at an end of the inner frame of the filter lens fitting, and the filter lens was crimped to the other end by a caulking part.
[Selection] Figure 3

Description

The present invention relates to a structure of a thin filter frame for a digital camera.

The present invention provides a filter frame for a digital camera in which the dimension of the filter frame in the optical axis direction, that is, the thickness of the filter frame is formed thin, and the filter frame is vignetted even when mounted on a telephoto lens or a wide-angle lens. It provides a difficult filter frame.

The present invention provides a thin filter frame for a digital camera, and in particular, a lens protection filter, a circular polarization filter, a light amount reduction filter, a light effect filter providing a special effect, and a soft focus that can express a subject softly. The present invention relates to a filter frame that is used to hold various filter lenses for digital cameras with high utility value such as filters.

With the widespread use of digital single-lens reflex cameras, it is possible to take pictures while directly confirming the effects of using filters on the viewfinder and LCD screen, or to install various interchangeable lenses and to have various effects at the tip of the interchangeable lens barrel. It is now possible to enjoy shooting with a camera.

However, the filter incorporates a disk-shaped filter lens having various effects in the filter frame main body, and the inner diameter of the filter frame main body on the incident light side has an attachment such as a hood or the like from the front edge to the rear. An inner diameter portion is formed by screwing female threads for overlapping different filters, and the outer diameter of the filter frame body on the camera lens barrel side is provided on the inner diameter portion of the camera lens barrel. An outer diameter portion is formed in which a male screw portion screwed to the mounting female screw portion is screwed.

Therefore, the dimension in the optical axis direction in the filter frame body, that is, the thickness of the filter frame body is the inner diameter portion in which the female screw is screwed, the thickness of the filter lens, and the thickness of the annular ring for holding the filter lens, The outer diameter part provided on the outer diameter part on the camera lens barrel side is added, and the conventional filter frame inevitably increases the thickness of the filter frame. If attached to the tip, the vignetting phenomenon will occur.

Thus, an example of constructing a filter frame having a thin shape which is difficult to vignett is disclosed in Japanese Patent Application Laid-Open No. 2010-1113016 (hereinafter referred to as Patent Document 1). In the description of the conventional example in Patent Document 1 (hereinafter, the part names of the conventional example are those of Japanese Patent Application Laid-Open No. 2010-1113016), an example using a retaining ring is disclosed as a method of fixing the optical filter to the filter frame. Therefore, there is a limit to shortening the width dimension of the retaining ring, and furthermore, it is difficult to uniformly reduce the thickness dimension of various optical filters. Making it short is a difficult problem.

In order to solve the above problems, the invention of Patent Document 1 includes a camera filter unit, a cylindrical filter frame, a cylindrical filter holding ring fixed to the inside of the filter frame, and the filter holding ring. An optical filter that is held inside, and a front stopper and a rear stopper that prevent the optical filter from moving back and forth, and the front stopper is formed at a front edge of the filter holding ring. The rear stopper is formed on the rear edge of the filter holding ring or on the inner peripheral surface of the filter frame, and the filter holding ring and the optical filter are not exposed from the front and rear ends of the filter frame. It is arranged in a state.

Therefore, in the invention of Patent Document 1, in the camera filter unit, the filter holding ring is fixed inside the filter frame, and the optical filter is pulled inside the filter holding ring. That is, the filter holding ring, which is a member for attaching the optical filter to the filter frame, is not disposed before or after the optical filter, but is disposed at the outer peripheral portion of the optical filter. As a result, when the filter holding ring and the optical filter are arranged without being exposed from the filter frame, the filter frame, the filter holding ring, and the optical filter are arranged concentrically, so that the dimension of the filter frame in the front-rear direction is shortened. It can be said.

However, the difference between the patent document 1 and the conventional example described in the patent document 1 is that the conventional example uses a retaining ring as a fixture of the optical filter, whereas the invention of the patent document 1 is a filter holding ring. The optical filter is fixed to the filter holding ring by protrusions and caulking (in some embodiments that do not use caulking), and this filter holding ring is fixed inside the filter frame.

Thus, in the structure in which the optical filter fixed in the filter frame by the filter holding ring is fixed by the annular protrusion (front stopper) or the crimping portion (rear stopper) on the ring, the protrusion and the crimp Only the thickness of the member formed by the portion is shortened, and the filter frame is not significantly reduced in thickness.

JP 2010-1113016 A

Thus, the problem to be solved by the present invention is to provide a filter frame for a digital camera in which the dimension of the filter frame in the optical axis direction, that is, the thickness of the filter frame is formed thin. It provides a filter frame that is resistant to vignetting even when attached to a lens or wide-angle lens.

The present invention also provides a filter that can reduce the weight of the filter and reduce the load on the autofocus motor by making the filter frame attached to the tip of the camera lens barrel thin. To do.

Furthermore, according to the present invention, the number of parts can be drastically reduced, such as a combination of a filter lens and one part of the filter body, so that the cost can be reduced and the assembly efficiency can be improved.

The reduction in the number of parts described above makes it possible to manufacture a filter frame integrally formed of a polymer elastic body, and a new thin filter frame can be manufactured.

In the present invention, the filter frame main body attached to the front end of the camera lens barrel is substantially bisected by forming the annular filter frame main body into an incident light side as a front frame and a camera lens barrel side as a rear frame, The front frame has a female threaded portion for attaching an attachment to the inner diameter of the front frame from the incident light side, and the rear frame has a threaded male threaded portion for screwing into the camera lens barrel from the camera lens barrel side. A filter lens holding ring is provided on the inner side of the joint portion of the filter body composed of the female screw portion and the male screw portion so as to protrude toward the optical axis, and a T-shape is provided at the tip of the filter lens holding ring portion. A filter lens fitting inner frame is provided, the filter lens is fitted to the filter lens fitting inner frame, and the filter lens is held by an annular edge provided at the end of the filter lens fitting inner frame. The At Kashimebero portion provided on the other end of Irutarenzu fitting frame it is to provide a thin filter frame for digital camera caulking the filter lens.

Further, in the present invention, the filter lens holding ring portion that protrudes toward the inside of the joint portion of the filter body is provided with a filter lens fitting inner frame that is bent in an L shape on the camera lens barrel side. The filter lens is fitted into the filter lens fitting inner frame, the filter lens is held by an annular edge provided at the end of the filter lens fitting inner frame, and the other end of the filter lens fitting inner frame. A thin filter frame for a digital camera in which the filter lens is caulked with a caulking portion provided in the lens.

Further, in the present invention, the filter lens holding ring portion that protrudes from the inside of the joint portion of the filter body is provided with a filter lens fitting inner frame that is bent in an L shape on the incident light side. A filter lens is fitted to the inner frame of the filter lens, the filter lens is held by an annular edge provided at the end of the inner frame of the filter lens, and provided at the other end of the inner frame of the filter lens. A thin filter frame for a digital camera in which the filter lens is caulked with a caulking portion.

And, the present invention includes a front frame, a rear frame, an attachment mounting female screw part, a male screw part to be screwed into a camera lens barrel, a filter lens holding ring part, a filter lens fitting inner part, and the like. This is a thin filter frame for a digital camera manufactured by integrally molding a frame, an annular edge portion, and a caulking portion with a polymer elastic body.

Thus, the present invention substantially bisects the annular filter frame main body to form the incident light side as a front frame and the camera lens barrel side as a rear frame, and the front frame has a front frame from the incident light side. An internal thread portion for attaching an attachment is screwed to the inner diameter portion, and a male screw portion to be screwed to the camera lens barrel from the camera lens barrel side is screwed to the rear frame, and the female screw portion and the male screw A filter lens holding ring is provided on the inner side of the joint of the filter body, which protrudes toward the optical axis, and the filter lens fitting ring extends in a T shape or L shape at the tip of the filter lens holding ring. A filter lens is fitted into the filter lens fitting inner frame, the filter lens is held by an annular edge provided at an end of the filter lens fitting inner frame, and the filter lens fitting inner frame The cap provided at the other end of the frame It was caulking the filter lens in the eye. Therefore, when an attachment such as a hood is attached to the female thread portion for attaching the attachment, the insertion portion of the male screw screwed to the hood or the like is securely attached without being obstructed by the filter lens fitting inner frame. . Similarly, when the threaded male screw of the filter frame is screwed onto the camera lens barrel, the inner frame of the filter lens does not get in the way, and the lens at the forefront of the camera lens barrel is the lens side of the filter lens. It can be configured without interference, and the thickness of the filter frame body can be configured thinly with only the front frame and the rear frame, providing a filter frame that is resistant to vignetting even when mounted on a telephoto lens or wide-angle lens. It is what makes it possible.

In addition, since the filter frame attached to the tip of the camera lens barrel in the present invention can be made thin, the filter can reduce the weight of the filter and reduce the load on the autofocus motor. Could be provided.

Further, according to the present invention, the number of parts can be drastically reduced, such as a combination of a filter lens and one part of the filter main body, and cost reduction and assembly efficiency can be improved.

The reduction in the number of parts described above makes it possible to manufacture a filter frame integrally formed of a polymer elastic body, and a new filter frame can be manufactured.

Explanatory drawing of the mounting position of a filter frame main body and a lens barrel. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view illustrating Example 1 of the present invention. (A) The AA partial enlarged view of FIG. (B) Explanatory drawing which shows the state which mounted | wore the lens barrel, and the state which mounted | wore the incident light side with FIG. 2 (A). The longitudinal cross-sectional view explaining Example 2 of this invention. (A) BB partial enlarged view of FIG. (B) Explanatory drawing which shows the state which mounted | wore the lens barrel, and the state which mounted | wore the incident light side with FIG. 4 (A). The longitudinal cross-sectional view explaining Example 3 of this invention. (A) CC partial enlarged view of FIG. (B) Explanatory drawing which shows the state which mounted | wore the lens barrel, and the state which mounted | wore the incident light side with FIG. 6 (A).

The present invention provides a thin filter frame for a digital camera, and in particular, a lens protection filter, a circular polarization filter, a light amount reduction filter, a light effect filter providing a special effect, and a soft focus that can express a subject softly. The present invention relates to a filter frame that is used to hold various filter lenses for digital cameras with high utility value such as filters.

With the widespread use of digital single-lens reflex cameras, it is possible to take pictures while directly confirming the effects of using filters on the viewfinder and LCD screen, or to install various interchangeable lenses and to have various effects at the tip of the interchangeable lens barrel. It is now possible to enjoy shooting with a camera.

However, the filter incorporates a disk-shaped filter lens having various effects in the filter frame main body, and the inner diameter of the filter frame main body incident light side is different from that of the hood or the like from the front edge to the rear. An inner diameter part is formed with a female thread for threading the filter, and the outer diameter of the filter frame body on the camera lens barrel side is mounted on the inner diameter part of the camera lens barrel. An outer diameter portion is formed with a male screw portion screwed to the female screw portion.

Therefore, the dimension in the optical axis direction in the filter frame body, that is, the thickness of the filter frame body is the inner diameter portion in which the female screw is screwed, the thickness of the filter lens, and the thickness of the annular ring for holding the filter lens, And it is composed of the outer lens part on the outer diameter of the camera lens barrel side, and the conventional filter frame inevitably increases the thickness of the filter frame. If it is used by attaching it to the part, it causes a vignetting phenomenon.

Thus, in the present invention, the filter frame main body mounted on the front end of the camera lens barrel is roughly divided into two parts, the incident light side as the front frame and the camera lens barrel side as the rear frame. An attachment female screw portion is attached to the front frame on the inner surface of the front frame from the incident light side, and the rear frame is attached to the camera lens barrel from the camera lens barrel side. The threaded portion is threaded, and a filter lens holding ring is provided on the inner side of the joint portion of the filter body composed of the female screw portion and the male screw portion so as to protrude toward the optical axis, and the tip end portion of the filter lens holding ring portion Is provided with a filter lens fitting inner frame extending in a T-shape, a filter lens is fitted into the filter lens fitting inner frame, and an annular edge provided at the end of the filter lens fitting inner frame. At And, it is preferable that caulking the filter lens at Kashimebero portion provided on the other end of the filter lens fitting frame.

Further, in the present invention, the filter lens holding ring portion that protrudes toward the inside of the joint portion of the filter body is provided with a filter lens fitting inner frame that is bent in an L shape on the camera lens barrel side. The filter lens is fitted into the filter lens fitting inner frame, the filter lens is held by an annular edge provided at the end of the filter lens fitting inner frame, and the other end of the filter lens fitting inner frame. It is preferable that the filter lens is caulked with a caulking portion provided in the.

Further, in the present invention, the filter lens holding ring portion that protrudes from the inside of the joint portion of the filter body is provided with a filter lens fitting inner frame that is bent in an L shape on the incident light side. A filter lens is fitted to the inner frame of the filter lens, the filter lens is held by an annular edge provided at the end of the inner frame of the filter lens, and provided at the other end of the inner frame of the filter lens. It is preferable that the filter lens is caulked with a caulking portion.

And, the present invention includes a front frame, a rear frame, an attachment mounting female screw part, a male screw part to be screwed into a camera lens barrel, a filter lens holding ring part, a filter lens fitting inner part, and the like. It is preferable that the frame, the annular edge portion, and the crimping bellows portion are integrally formed of a polymer elastic body.

Thus, the present invention substantially bisects the annular filter frame main body to form the incident light side as a front frame and the camera lens barrel side as a rear frame, and the front frame has an inner diameter of the front frame from the incident light side. A female screw part for attaching an attachment is screwed to the rear part, and a male screw part to be screwed into the camera lens barrel from the camera lens barrel side is screwed to the rear frame, and the female screw part and the male screw part A filter lens retaining ring is provided on the inner side of the joint portion of the filter body so as to protrude toward the optical axis, and a filter lens fitting inner frame extending in a T shape or L shape is provided at the tip of the filter lens retaining ring. A filter lens is fitted to the filter lens fitting inner frame, the filter lens is held by an annular edge provided at an end of the filter lens fitting inner frame, and the filter lens fitting inner frame is provided. Caulking provided at the other end of It was caulking the filter lens at. Therefore, when an attachment such as a hood is attached to the female thread portion for attaching the attachment, the insertion portion of the male screw screwed to the hood or the like is securely attached without being obstructed by the filter lens fitting inner frame. . Similarly, when the threaded male screw of the filter frame is screwed onto the camera lens barrel, the inner frame of the filter lens does not get in the way, and the lens at the forefront of the camera lens barrel is the lens side of the filter lens. It can be configured without interference, and the thickness of the filter frame body can be configured thinly with only the front frame and the rear frame, providing a filter frame that is resistant to vignetting even when mounted on a telephoto lens or wide-angle lens. It is what makes it possible.

In addition, since the filter frame attached to the tip of the camera lens barrel in the present invention can be made thin, the filter can reduce the weight of the filter and reduce the load on the autofocus motor. Could be provided.

Further, according to the present invention, the number of parts can be drastically reduced, such as a combination of a filter lens and one part of the filter main body, and cost reduction and assembly efficiency can be improved.

The reduction in the number of parts described above makes it possible to manufacture a filter frame integrally formed of a polymer elastic body, and a new filter frame can be manufactured.

1 is an explanatory view of the mounting position of the filter frame main body and the lens barrel, FIG. 2 is a longitudinal sectional view for explaining the first embodiment of the present invention, and FIG. 3 (A) is an A- FIG. 3B is an explanatory view showing a state where FIG. 3A is attached to the lens barrel and a state where the attachment is attached to the incident light side.

In FIG. 1, 1 is a filter frame body, 2 is a filter lens, 3 is a digital camera body, 4 is a camera lens barrel, 5 is an incident light side, 6 is a filter lens body, and 6 is an incident light side. The camera lens barrel side, C indicates the optical axis of the filter frame body and the camera lens barrel.

The filter lens 2 built in the filter frame body 1 includes a lens protection filter, a circular polarization filter, a light amount reduction filter, a light effect filter that brings about a special effect, and a soft focus that can express the subject softly. Various filter lenses such as industrial filters are used.

Thus, in the first embodiment, a filter frame for a digital camera in which the dimension in the optical axis direction C of the filter frame main body 1 mounted on the front surface of the lens barrel 4, that is, the thickness t of the filter frame main body 1 is formed thin. A main body 1 is provided, and the filter frame main body 1 provides a filter frame that is resistant to vignetting even when attached to a telephoto lens or a wide-angle lens.

2 and 3A and 3B, 1 is a filter frame body, 2 is a filter lens, C is an optical axis of the filter frame body, t is a thickness of the filter frame body 1, and 5 is a filter frame body. The incident light side, 6 indicates the camera lens barrel side of the filter frame body, and the filter frame body 1 substantially bisects the filter frame body 1 so that the incident light side 5 is the front frame 7 and the camera lens barrel 4 side. Are integrally formed as a rear frame 8.

3A and 3B, the internal thread portion 10 for attaching an attachment such as a hood is screwed to the inner diameter portion 9 of the front frame 7 of the filter frame main body 1. An escape groove 11 is formed in the screw base portion of the female screw portion 10. The escape groove 11 has a configuration in which the male screw of the attachment screwed to the female screw portion 10 is screwed with a clearance and comes into contact with the stopper surface 12 provided on the screw base, and the male screw of the attachment is tightly engaged. And can be detachably screwed into the female screw portion 10 of the front frame 7.

Next, the outer peripheral portion 13 of the rear frame 8 of the filter frame main body 1 is screwed with a male screw portion 14 for mounting to the camera lens barrel 4, and the screw base portion of the male screw portion 14 has a relief. A groove 15 is engraved. The escape groove 15 has a configuration in which the female screw of the camera lens barrel 4 to which the male screw portion 14 is screwed is loosely screwed and comes into contact with a stopper surface 16 provided in the screw base portion. The male screw portion 14 of the filter frame main body 1 can be detachably screwed without being tightly engaged with the distal end portion of the camera lens barrel 4.

In the first embodiment, a thin annular filter lens holding ring portion 18 that is not restricted in thickness is provided on the joint surface inner side 17 of the front frame 7 and the rear frame 8 so as to protrude toward the optical axis C side. An annular filter lens fitting inner frame 19 having a T-shape as a whole is provided at the tip of the lens holding ring 18 with the filter lens holding ring 18 as a holding body.

Thus, the thin annular filter lens holding ring portion 18 provides the gap portions 20a and 20b by separating the filter fitting inner frame 19 from the joint surface inner side 17, so that the gap portion 20a can be connected to the male screw of the attachment. A defective portion of the frame structure that becomes a barrier when the outer cylinder is screwed to the front frame 7 is removed. Further, the gap 20b has a gap so as not to hit the lens 22 at the tip of the camera lens barrel, and also provides a work space when the filter lens 2 is attached and the filter lens 2 is fixed. . 3B shows an example in which an attachment 21 such as a hood is attached to the incident light side 5 of the filter frame main body 1 with an imaginary line. The camera lens barrel side 6 is connected to the camera lens barrel 4. The state where the filter frame main body 1 is mounted is shown, and the front lens 22 of the camera lens barrel 4 and the rear frame 8 of the filter frame main body 1 are configured so as not to interfere with each other.

The filter lens 2 is mounted on the inner diameter portion 23 of the filter lens mounting inner frame 19, and the annular edge 24 is provided on the incident light side 5 of the filter lens mounting inner frame 19. A caulking bellows portion 25 is provided on the camera lens barrel side 6 of the frame 19. The filter lens 2 is attached to the inner diameter portion 23, and the caulking bellows portion 25 is then caulked to stop the caulking bellows portion 25. Can provide a filter frame.

Thus, in the first embodiment, the filter frame main body 1 attached to the tip of the camera lens barrel 4 is substantially bisected by the annular filter frame main body 2 so that the incident light side 5 is the front frame 7 and the camera lens barrel. The side frame 6 is formed as a rear frame 8, and the front frame 6 is provided with an internal thread portion 10 for attaching an attachment to the front frame inner diameter portion 9 from the incident light side 5, and the rear frame 8 has a camera lens mirror. A male screw portion 14 to be screwed into the camera lens barrel 4 from the tube side 6 is screwed, and a filter lens holding ring portion 18 is provided on the inner side 17 of the joint surface composed of the female screw portion 10 and the male screw portion 14 as an optical axis. A filter lens fitting inner frame 19 extending in a T shape is provided at the tip of the filter lens holding ring portion 18 so as to protrude toward the C side, and the filter lens 2 is fitted into the filter lens fitting inner frame 19. The filter lens 2 The filter lens 2 is digitally held by an annular edge 24 provided at the end of the filter lens fitting inner frame 19, and the filter lens 2 is caulked with a caulking bellows 25 provided at the other end of the filter lens fitting inner frame 19. This is a filter frame for a camera.

Further, as another example in the first embodiment, the front frame 6 and the rear frame 7 constituting the filter lens body 1, the female screw portion 10 for attaching the attachment, the male screw portion 14 to be screwed into the camera lens barrel, and the filter lens holding After the ring portion 18, the filter lens fitting inner frame 19, the annular edge portion 24, and the crimping bellows portion 25 are integrally formed of a polymer elastic body, and the filter lens 2 is fitted to the filter lens fitting inner frame 19. It is also possible to provide a filter frame for a digital camera by fixing the caulking section 25 with heat caulking.

4 is a longitudinal sectional view for explaining a second embodiment of the present invention, FIG. 5 (A) is a partially enlarged view of BB of FIG. 4, and FIG. 5 (B) is a lens mirror of FIG. 5 (A). It is explanatory drawing which shows the state mounted | worn with the cylinder, and the state mounted | worn with the attachment to the incident light side.

Thus, FIG. 1 is referred to for an explanatory view of the mounting positions of the filter frame main body and the lens barrel in which the second embodiment is implemented. Provided is a filter frame body 1 for a digital camera in which the dimension in the optical axis direction C of the filter frame body 1 mounted on the front surface of the lens barrel 4, that is, the thickness t of the filter frame body 1 is formed thin. The frame body 1 provides a filter frame that is less vignetting even when mounted on a telephoto lens or a wide-angle lens.

4 and 5A and 5B, 1 is a filter frame body, 2 is a filter lens, C is an optical axis of the filter frame body, t is a thickness of the filter frame body 1, and 5 is a filter frame body. The incident light side, 6 indicates the camera lens barrel side of the filter frame body, and the filter frame body 1 substantially bisects the filter frame body 1 so that the incident light side 5 is the front frame 7 and the camera lens barrel 4 side. Are integrally formed as a rear frame 8.

5A and 5B, the internal thread portion 10 for attaching an attachment such as a hood is screwed to the inner diameter portion 9 of the front frame 7 of the filter frame main body 1. An escape groove 11 is formed in the screw base portion of the female screw portion 10. The escape groove 11 has a configuration in which the male screw of the attachment screwed to the female screw portion 10 is screwed with a clearance and comes into contact with the stopper surface 12 provided on the screw base, and the male screw of the attachment is tightly engaged. And can be detachably screwed into the female screw portion 10 of the front frame 7.

Next, the outer peripheral portion 13 of the rear frame 8 of the filter frame main body 1 is screwed with a male screw portion 14 for mounting to the camera lens barrel 4, and the screw base portion of the male screw portion 14 has a relief. A groove 15 is engraved. The escape groove 15 has a configuration in which the female screw of the camera lens barrel 4 to which the male screw portion 14 is screwed is loosely screwed and comes into contact with a stopper surface 16 provided in the screw base portion. The male screw portion 14 of the filter frame main body 1 can be detachably screwed without being tightly engaged with the distal end portion of the camera lens barrel 4.

In the second embodiment, a thin annular filter lens holding ring portion 18 that does not have a thickness is provided on the joint surface inner side 17 of the front frame 7 and the rear frame 8 so as to protrude to the optical axis C side. A filter lens fitting inner frame 19 that protrudes in the six directions toward the camera lens barrel side is provided at the distal end of the lens holding ring 18 and has an overall L-shape with the filter lens holding ring 18 as a holding body. ing.

Thus, the thin annular filter lens holding ring portion 18 provides the gap portions 20a and 20b by separating the filter fitting inner frame 19 from the joint surface inner side 17, so that the gap portion 20a can be connected to the male screw of the attachment. A defective portion of the frame structure that becomes a barrier when the outer cylinder is screwed to the front frame 7 is removed. Further, the gap 20b has a gap so that the lens 22 at the forefront of the camera lens barrel does not hit, and provides a work space when the filter lens 2 is attached and the filter lens 2 is fixed. . FIG. 5B shows an example in which an attachment 21 such as a hood is attached to the incident light side 5 of the filter frame main body 1 with an imaginary line. The camera lens barrel side 6 is connected to the camera lens barrel 4. The state where the filter frame main body 1 is mounted is shown, and the foremost lens 22 of the camera lens barrel 4 and the rear frame 8 of the filter frame main body 1 are configured not to interfere with each other.

The filter lens 2 is mounted on the inner diameter portion 23 of the filter lens mounting inner frame 19, and the annular edge 24 is provided on the incident light side 5 of the filter lens mounting inner frame 19. A caulking bellows portion 25 is provided on the camera lens barrel side 6 of the frame 19. The filter lens 2 is attached to the inner diameter portion 23, and the caulking bellows portion 25 is then caulked to stop the caulking bellows portion 25. Can provide a filter frame.

Thus, in the second embodiment, the filter frame main body 1 attached to the tip of the camera lens barrel 4 is substantially divided into two parts by dividing the annular filter frame main body 2 into the front light frame 5 and the camera lens barrel. The side frame 6 is formed as a rear frame 8, and the front frame 6 is provided with an internal thread portion 10 for attaching an attachment to the front frame inner diameter portion 9 from the incident light side 5, and the rear frame 8 has a camera lens mirror. A male screw portion 14 to be screwed into the camera lens barrel 4 from the tube side 6 is screwed, and a filter lens holding ring portion 18 is provided on the inner side 17 of the joint surface composed of the female screw portion 10 and the male screw portion 14 as an optical axis. The filter lens holding ring 18 is provided in a protruding manner on the C side, and the tip of the filter lens holding ring 18 provided on the inner side 17 of the joint surface of the filter body 1 is bent into an L-shape on the camera lens barrel side. A frame 19 is provided, The filter lens 2 is fitted to the filter lens fitting inner frame 19, and the filter lens 2 is held by an annular edge 24 provided at the end of the filter lens fitting inner frame 17. This is a filter frame for a digital camera in which the filter lens is caulked with a caulking part provided at the other end.

In the second embodiment, as another example, the front frame 6 and the rear frame 7 constituting the filter lens body 1, the female screw portion 10 for attaching the attachment, the male screw portion 14 to be screwed into the camera lens barrel, the filter The lens holding ring portion 18, the filter lens fitting inner frame 19, the annular edge portion 24, and the caulking bellows portion 25 are integrally formed of a polymer elastic body, and the filter lens 2 is fitted to the filter lens fitting inner frame 19. After that, it is also possible to provide a filter frame for a digital camera by fixing the caulking section 25 with heat caulking.

6 is a longitudinal sectional view for explaining a third embodiment of the present invention, FIG. 7A is an enlarged view of a CC portion of FIG. 6, and FIG. 7B is a lens mirror of FIG. 7A. It is explanatory drawing which shows the state mounted | worn with the cylinder, and the state mounted | worn with the attachment to the incident light side.

Thus, FIG. 1 is referred to for an explanatory view of the mounting positions of the filter frame main body and the lens barrel in which the third embodiment is implemented. Provided is a filter frame body 1 for a digital camera in which the dimension in the optical axis direction C of the filter frame body 1 mounted on the front surface of the lens barrel 4, that is, the thickness t of the filter frame body 1 is formed thin. The frame body 1 provides a filter frame that is less vignetting even when mounted on a telephoto lens or a wide-angle lens.

6 and 7A and 7B, 1 is a filter frame body, 2 is a filter lens, C is an optical axis of the filter frame body, t is a thickness of the filter frame body 1, and 5 is a filter frame body. The incident light side, 6 indicates the camera lens barrel side of the filter frame body, and the filter frame body 1 substantially bisects the filter frame body 1 so that the incident light side 5 is the front frame 7 and the camera lens barrel 4 side. Are integrally formed as a rear frame 8.

Further, the description from here is mainly performed with reference to FIGS. 7A and 7B, but a female screw portion 10 for attaching an attachment such as a hood is provided on the inner diameter portion 9 of the front frame 7 of the filter frame main body 1. A thread groove 11 is formed in the screw base of the female screw portion 10. The escape groove 11 has a configuration in which the male screw of the attachment screwed to the female screw portion 10 is screwed with a clearance and comes into contact with the stopper surface 12 provided on the screw base, and the male screw of the attachment is tightly engaged. And can be detachably screwed into the female screw portion 10 of the front frame 7.

Next, the outer peripheral portion 13 of the rear frame 8 of the filter frame main body 1 is screwed with a male screw portion 14 for mounting to the camera lens barrel 4, and the screw base portion of the male screw portion 14 has a relief. A groove 15 is engraved. The escape groove 15 has a configuration in which the female screw of the camera lens barrel 4 to which the male screw portion 14 is screwed is loosely screwed and comes into contact with a stopper surface 16 provided in the screw base portion. The male screw portion 14 of the filter frame main body 1 can be detachably screwed without being tightly engaged with the distal end portion of the camera lens barrel 4.

In the third embodiment, a thin annular filter lens holding ring portion 18 that is not constrained in thickness is provided on the joint surface inner side 17 of the front frame 7 and the rear frame 8 so as to protrude toward the optical axis C side. A filter lens fitting inner frame 19 that protrudes in the direction of the incident light side 5 is provided at the tip of the lens holding ring 18 and has an L-shaped ring as a whole with the filter lens holding ring 18 as a holding body. Yes.

Thus, the thin annular filter lens holding ring portion 18 provides the gap portions 20a and 20b by separating the filter fitting inner frame 19 from the joint surface inner side 17, so that the gap portion 20a can be connected to the male screw of the attachment. A defective portion of the frame structure that becomes a barrier when the outer cylinder is screwed to the front frame 7 is removed. The gap 20b is configured so that the front lens 22 of the camera lens barrel 4 and the rear frame 8 of the filter frame main body 1 do not interfere with each other. 7B shows an example in which an attachment 21 such as a hood is attached to the incident light side 5 of the filter frame main body 1 with an imaginary line. The camera lens barrel side 6 is connected to the camera lens barrel 4. The state where the filter frame main body 1 is mounted is shown, and the camera lens barrel side 6 is configured such that the lens 22 at the forefront of the camera lens barrel and the rear frame 8 of the filter frame main body 1 do not interfere with each other.

The filter lens 2 is mounted on the inner diameter portion 23 of the filter lens mounting inner frame 19, and the annular edge 24 is provided on the incident light side 5 of the filter lens mounting inner frame 19. A caulking bellows portion 25 is provided on the camera lens barrel side 6 of the frame 19. The filter lens 2 is attached to the inner diameter portion 23, and the caulking bellows portion 25 is then caulked to stop the caulking bellows portion 25. Can provide a filter frame.

Thus, in the third embodiment, the filter frame main body 1 attached to the tip of the camera lens barrel 4 is substantially bisected by the annular filter frame main body 2 so that the incident light side 5 is the front frame 7 and the camera lens barrel. The side frame 6 is formed as a rear frame 8, and the front frame 6 is provided with an internal thread portion 10 for attaching an attachment to the front frame inner diameter portion 9 from the incident light side 5, and the rear frame 8 has a camera lens mirror. A male screw portion 14 to be screwed into the camera lens barrel 4 from the tube side 6 is screwed, and a filter lens holding ring portion 18 is provided on the inner side 17 of the joint surface composed of the female screw portion 10 and the male screw portion 14 as an optical axis. A filter lens fitting inner frame which is provided to protrude on the C side and has a shape in which the tip end of the filter lens holding ring portion 18 provided to protrude on the inner side 17 of the joining surface of the filter body 1 is bent in an L shape on the incident light side 5. 19 and the filter The filter lens 2 is fitted to the lens fitting inner frame 19, and the filter lens 2 is held by an annular edge 24 provided at the end of the filter lens fitting inner frame 17. It is a filter frame for a digital camera in which the filter lens is caulked with a caulking portion provided at the other end.

Further, in the third embodiment, as another example, the front frame 6 and the rear frame 7 constituting the filter lens body 1, the female screw portion 10 for attaching the attachment, the male screw portion 14 to be screwed into the camera lens barrel, the filter The lens holding ring portion 18, the filter lens fitting inner frame 19, the annular edge portion 24, and the caulking bellows portion 25 are integrally formed of a polymer elastic body, and the filter lens 2 is fitted to the filter lens fitting inner frame 19. After that, it is also possible to provide a filter frame for a digital camera by fixing the caulking section 25 with heat caulking.

Thus, the present invention substantially bisects the annular filter frame main body to form the incident light side as the front frame and the camera lens barrel side as the rear frame, and the front frame has an inner diameter of the front frame from the incident light side. A female screw part for attaching an attachment is screwed to the rear part, and a male screw part to be screwed into the camera lens barrel from the camera lens barrel side is screwed to the rear frame, and the female screw part and the male screw part A filter lens retaining ring is provided on the inner side of the joint portion of the filter body so as to protrude toward the optical axis, and a filter lens fitting inner frame extending in a T shape or L shape is provided at the tip of the filter lens retaining ring. A filter lens is fitted to the filter lens fitting inner frame, the filter lens is held by an annular edge provided at an end of the filter lens fitting inner frame, and the filter lens fitting inner frame is provided. Oak provided at the other end of It was caulking the filter lens in the tongue part.

Therefore, when an attachment such as a hood is attached to the female thread portion for attaching the attachment, the insertion portion of the male screw screwed to the hood or the like is securely attached without being obstructed by the filter lens fitting inner frame. . Similarly, when the threaded male screw of the filter frame is screwed onto the camera lens barrel, the inner frame of the filter lens does not get in the way, and the lens at the forefront of the camera lens barrel is the lens side of the filter lens. It can be configured without interference, and the thickness of the filter frame body can be configured thinly with only the front frame and the rear frame, providing a filter frame that is resistant to vignetting even when mounted on a telephoto lens or wide-angle lens. It is what makes it possible.

Further, in the present invention, it is possible to produce a thin filter frame attached to the tip of the camera lens barrel, and the product material can be converted from a conventional metal to a polymer elastic body, so the weight of the filter It was possible to provide a filter that can reduce the weight of the autofocus motor.

Further, according to the present invention, the number of parts can be drastically reduced, such as a combination of a filter lens and one part of the filter main body, and cost reduction and assembly efficiency can be improved.

The reduction in the number of parts described above makes it possible to manufacture a filter frame integrally formed of a polymer elastic body, and a new filter frame can be manufactured.

DESCRIPTION OF SYMBOLS 1 Filter frame main body 2 Filter lens 3 Digital camera main body 4 Camera lens barrel 5 Incident light side 6 Camera lens barrel side 7 Front frame 8 Rear frame 9 Inner diameter part 10 Female thread part 11 Escape groove 12 Stopper surface 13 Outer peripheral part 14 Male Screw portion 15 Escape groove 16 Stopper surface 17 Joint surface inner side 18 Filter lens holding ring portion 19 Filter lens fitting inner frame 20a, 20b Gap portion 21 Attachment 22 Lens 23 Inner diameter portion 24 Annular edge portion 25 Crimping portion C Optical axis t Filter Frame body thickness

Claims (4)

The filter frame main body 1 attached to the front end portion of the camera lens barrel is substantially divided into two parts by dividing the annular filter frame main body 1 into an incident light side 5 as a front frame 7 and a camera lens barrel side 6 as a rear frame 8. The front frame 7 is provided with a female thread portion 10 for attaching an attachment to the inner diameter portion 9 of the front frame 7 from the incident light side 5, and the camera lens barrel from the camera lens barrel side 6 to the rear frame 8. A threaded male threaded portion 14 is threaded, and a filter lens retaining ring 18 protrudes toward the optical axis C on the inner side 17 of the filter frame body composed of the female threaded portion 10 and the male threaded portion 14. A filter lens fitting inner frame 19 having a T-shaped cross section including the optical axis C is provided on the inner peripheral side of the filter lens holding ring portion 18. Insert the filter lens 2 and The filter lens 2 is held by an annular edge 24 provided at one peripheral edge of the filter lens fitting inner frame 19, and is attached to a caulking part 25 provided at the other peripheral edge of the filter lens fitting inner frame 19. A filter frame for a digital camera, wherein the filter lens 2 is crimped. A filter having a shape in which the inner peripheral side of the filter lens holding ring portion 18 protruding from the inner side 17 of the joint surface of the filter frame main body 1 is bent in an L shape on the camera lens barrel side 6 including the optical axis C. A lens fitting inner frame 19 is provided, the filter lens 2 is fitted to the filter lens fitting inner frame 19, and the filter lens 2 is provided at one peripheral edge of the filter lens fitting inner frame 19. 2. The digital lens according to claim 1, wherein the filter lens 2 is held by a portion 24 and the filter lens 2 is crimped by a crimping bellows portion 25 provided at the other peripheral edge of the filter lens fitting inner frame 19. Filter frame for the camera. A filter lens having a shape in which the cross-sectional shape of the cross section including the optical axis C on the incident light side 5 is bent in an L shape on the inner peripheral side of the filter lens holding ring portion 18 provided to protrude on the inner side 17 of the joint surface of the filter frame body 1 A fitting inner frame 19 is provided, the filter lens 2 is fitted to the filter lens fitting inner frame 19, and the filter lens 2 is provided at one peripheral edge of the filter lens fitting inner frame 19. 24. The filter lens 2 is held by a crimping bellows portion 25 provided at the other peripheral edge portion of the filter lens fitting inner frame 19, and the filter lens 2 is crimped. Filter frame for digital cameras described in The front frame 7 and the rear frame 8 constituting the filter lens frame main body 1, the female screw portion 10 for attaching the attachment, the male screw portion 14 to be screwed into the camera lens barrel, the filter lens holding ring portion 18, and the filter lens fitting The filter frame for a digital camera according to any one of claims 1 to 3, wherein the inner frame 19, the annular edge portion 24, and the crimping bellows portion 25 are integrally formed of a polymer elastic body.

Images