JP2013092609A - Imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate removing work for such as dust attached to an optical part arranged in an interior space of an external package.SOLUTION: An external package cover unit 60 includes a lens mount 63 for attaching an exchange lens. An ND filter unit 70 is integrated with an ND filter 1, includes an aperture section 11 on a subject side of the ND filter 1 and is fixed to the external package cover unit 60. A cover glass unit 30 including a retaining member 32 for retaining a cover glass 31 is composed to be capable of attachment/detachment on a subject side in a state with the ND filter unit 70 still fixed to the external package cover unit 60. In the state having the cover glass unit 30 attached to the external package cover unit 60, the cover glass 31 seals the aperture section 11 and in a state of having the cover glass unit 30 removed from the external package cover unit 60, the ND filter 1 can be seen from the subject side through the aperture section 11.

Description

  The present invention relates to a technique for removing dust adhering to an optical component in an imaging apparatus, in particular, an interchangeable lens imaging apparatus.

  Conventionally, in an imaging apparatus, in order to prevent dust and the like from entering an optical path and appearing in an image, the imaging optical system often has a sealed structure so that dust and the like do not enter from the outside.

  However, no matter how strictly it is sealed, it is difficult to completely eliminate the possibility of dust from the outside. In particular, in an interchangeable lens type imaging device that has been on the market in recent years, due to its structure, dust is more likely to enter from the outside than an imaging device equipped with a lens.

  Accordingly, there is a need for a method that can remove dust when the imaging optical system itself has a sealed structure and dust or the like is mixed inside. As such a method, Patent Document 1 proposes a dust removal device for an interchangeable lens imaging device. That is, the air guide tube is inserted from the mount side with the lens removed, so that dust attached to the optical member (low-pass filter) on the outermost surface can be blown away.

JP 2007-47487 A

  However, according to the method of Patent Document 1, only dust attached to a location where air can be sent directly from the outside can be blown away. Accordingly, when dust enters the internal space of the exterior sealed to some extent from the outside, it cannot be removed by the above method. In order to reliably remove dust that has entered the internal space, it is necessary to disassemble the imaging apparatus main body and take out the optical component to which dust has adhered to remove the dust, but such work is very inefficient.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to make it easy to remove dust and the like attached to optical components arranged in the internal space of the exterior.

  In order to achieve the above object, the present invention includes a lens mount for mounting an interchangeable lens and an optical component that is attached to an exterior portion, and is fixed to the exterior portion and has an opening through which an optical axis passes. An optical unit on the subject side, and a holding member configured to hold the transparent member and be detachable from the subject side with respect to the exterior portion while the optical unit is fixed to the exterior portion. When the holding member is attached to the exterior portion, the transparent member closes the opening, and when the holding member is removed from the exterior portion, the optical component is viewed from the subject side via the opening. It is configured to be visible.

  ADVANTAGE OF THE INVENTION According to this invention, the removal operation | work of the dust adhering to the optical component arrange | positioned in the interior space of an exterior can be made easy.

1 is an exploded perspective view of an interchangeable lens imaging apparatus according to an embodiment of the present invention. It is the perspective view which looked at the ND filter unit from the to-be-photographed object side and the image pick-up element unit side, respectively. It is the disassembled perspective view which looked at the cover glass unit from the to-be-photographed object side and the image pick-up element unit side, respectively. It is a perspective view of the cover glass unit seen from the image sensor unit side. It is an external appearance perspective view of the apparatus main body in the state where the interchangeable lens is not attached after completion of the assembly, and an external perspective view of the apparatus main body showing a state where the cover glass unit is removed from the assembly completion state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view of an interchangeable lens imaging apparatus according to an embodiment of the present invention.

  The apparatus main body 100 of the imaging apparatus includes a cover glass unit 30, an exterior cover unit 60 that is an exterior part, an ND filter unit 70 that is an optical unit, and an image sensor unit 90 as main components. These are arranged along the direction of the optical axis Z of an interchangeable lens (not shown), and among these, the image sensor unit 90 is arranged on the side farthest from the subject side.

  FIGS. 2A and 2B are perspective views of the ND filter unit 70 as viewed from the subject side and the image sensor unit 90 side, respectively.

  The ND filter unit 70 includes an ND filter 1, which is an optical component, a mold cover 2, a metal cover 3, a flexible substrate 5, a low-pass filter 6, and a presser plate 7. The ND filter 1 is an optical filter that reduces the amount of incident light from the lens. By using the ND filter 1, it is possible to open the aperture for shooting and to reduce the shutter speed. Therefore, the ND filter 1 is used when shooting using a special effect due to long exposure.

  The mold cover 2 is provided with screw fastening portions 10 a to 10 c for fastening to the metal cover 3 and attachment portions 12 a to 12 d for attaching to the exterior cover unit 60. Further, the mold cover 2 has an opening 11 through which the optical axis Z passes (FIG. 2A).

  The ND filter 1 is built in the ND filter unit 70 and disposed in an internal space covered with the mold cover 2 and the metal cover 3. The ND filter 1 is positioned on the optical axis Z in order to transmit incident light from the lens when used for photographing. However, at the time of non-photographing use, the driving mechanism (not shown) of the ND filter unit 70 moves in the A direction (a plane direction substantially perpendicular to the optical axis Z) in FIG. Evacuation is possible.

  Information on whether the ND filter 1 is in the use position or the retracted position is detected by a detection means (not shown) provided in the ND filter unit 70 and is transmitted as an electrical signal through the flexible substrate 5 to a main body control unit (not shown). Sent to. Similarly to the mold cover 2, the metal cover 3 is provided with an opening (not shown) on the optical axis Z, and a low-pass filter 6 is disposed so as to close the opening (FIG. 2B). )).

  The low-pass filter 6 is an optical low-pass filter that removes high-frequency components of the spatial frequency of the optical image. That is, the low-pass filter 6 is a filter that attenuates and blocks a frequency signal higher than a specific threshold and allows only a low frequency to pass as a signal. It is used.

  The low-pass filter 6 is fixed to the metal cover 3 by assembling the sheet metal member 7 on the low-pass filter 6 (from the image sensor side) to the metal cover 3 using screws 9a and 9b.

  With such a configuration, the ND filter 1 is disposed in a space sealed by the mold cover 2, the metal cover 3, the low-pass filter 6, and the sheet metal member 7 in a portion excluding the opening 11 of the mold cover 2. It will be. As a single unit of the ND filter unit 70, the ND filter 1 is opened to the subject side through the opening 11.

  Next, the cover glass unit 30 for closing the opening 11 of the mold cover 2 will be described.

  3A and 3B are exploded perspective views of the cover glass unit 30 as viewed from the subject side and the image sensor unit 90 side, respectively. FIG. 4 is a perspective view of the cover glass unit 30 as viewed from the image sensor unit 90 side.

  The cover glass unit 30 includes a cover glass 31 that is a transparent member, a holding member 32 that holds the cover glass 31, a pressing sheet metal 33 that is a conductive portion, and double-sided tapes 34a and 34b. The holding member 32 includes welded portions 35a and 35b, double-sided tape attaching surfaces 37a and 37b, guide ribs 38a to 38f, three screw seats 39a, 39b and 39c, an opening 40 through which the optical axis Z passes, and a knob portion 41. Is provided. The knob portion 41 extends from the upper portion of the holding member 32 toward the subject, and can hold the entire cover glass unit 30 by holding it with a finger or tweezers.

  The cover glass 31 is larger than the opening 40 so that the entire opening 40 can be covered. Further, slit holes 43 a and 43 b are formed in the presser metal plate 33.

  As an assembly order of the cover glass unit 30, first, the double-sided tapes 34a and 34b are attached to the double-sided tape attachment surfaces 37a and 37b (FIG. 3B) of the holding member 32. Next, the cover glass 31 is attached from above, and the cover glass 31 is held and fixed to the holding member 32. At that time, the guide ribs 38 a to 38 f (FIG. 3B) provided on the holding member 32 serve as a guide along the outer shape of the cover glass 31. It can be held in a positioned state.

  Next, the holding sheet metal 33 is assembled to the holding member 32. At that time, the welded portions 35a and 35b of the holding member 32 are fitted into the slit holes 43a provided in the presser metal plate 33 (FIG. 4). And weld part 35a, 35b is welded with respect to the slit hole 43a. Although not shown, the holding member 32 has similar welds at the diagonal positions of the welds 35a and 35b, and performs similar welds on the slit holes 43b. Thereby, the pressing sheet metal 33 is fixed to the holding member 32 on both sides.

  When the pressing sheet metal 33 is assembled, the cover glass 31 comes into contact with the pressing sheet metal 33. Alternatively, at least a part of the holding member 32 may be formed of a conductive portion, and the cover glass 31 and the pressing sheet metal 33 may be electrically connected via the conductive portion.

  Next, the overall configuration of the apparatus main body 100 will be described with reference to FIG.

  First, as shown in FIG. 1, the exterior cover unit 60 includes a metal exterior part 61, a mold exterior part 62, a lens mount 63, a lens release button 64, and an electrical contact 65. The lens mount 63 is a part for mounting and fixing an interchangeable lens (not shown) to the apparatus main body 100, and is also a reference surface for mounting the interchangeable lens.

  By pressing the lens release button 64 with the interchangeable lens attached to the lens mount 63, the interchangeable lens can be removed from the lens mount 63. The electrical contact 65 provided on the metal exterior 61 contacts the electrical contact of the interchangeable lens mounted on the lens mount 63, electrically connects the interchangeable lens and the apparatus main body 100, and communicates electrical signals. It is intended to be able to perform.

  The structures of the lens mount 63, the lens release button 64, and the electrical contact 65 are well known and will not be described in detail.

  The metal exterior part 61 is provided with an opening 67 and a screw boss 68 for assembling the cover glass unit 30. The screw boss 68 is a fastening portion for fastening the cover glass unit 30, and only one screw boss 68 appears in FIG. 1, but there are three screw bosses 68 corresponding to the three screw seats 39 a, 39 b, 39 c of the cover glass unit 30. Provided. Specifically, the screw bosses 68 are provided at a total of three locations on the left and right sides of the upper portion of the metal exterior 61, and are arranged at positions that do not overlap with the electrical contacts 65 in projection when viewed from the subject side. The metal exterior part 61 is further provided with an attachment part 69 for attaching the electrical contact 65.

  An elastic member 81 is disposed between the ND filter unit 70 and the cover glass unit 30. The elastic member 81 has an opening 82 that is slightly larger than the opening 11 of the ND filter unit 70, and the material thereof is, for example, sponge.

  Incident light from the subject passes through the mounted interchangeable lens, and the opening 40 of the cover glass unit 30, the opening 67 of the exterior cover unit 60, the opening 82 of the elastic member 81, and the opening of the ND filter unit 70. 11 will pass. The image sensor unit 90 converts this incident light into an electric signal.

  The cover glass unit 30 and the ND filter unit 70 are positioned so as to sandwich the exterior cover unit 60 in the optical axis Z direction. The cover glass unit 30 is assembled to the exterior cover unit 60 in the α direction (direction parallel to the optical axis Z and from the subject side to the image sensor side) via screw seats 39a to 39c. That is, the screw seats 39a to 39c are fastened to the corresponding screw bosses 68 by screws 66a to 66c.

  At that time, the presser metal plate 33 (FIG. 3) of the cover glass unit 30 comes into contact with the exterior cover unit 60 through the metal exterior portion 61 and the screw boss 68 which are metal portions, and mutual conduction is ensured. Since the presser sheet metal 33, the metal exterior part 61, and the screw boss 68 are conductive, static electricity charged in the cover glass 31 flows to the metal exterior part 61 through the retainer sheet metal 33, and dust or the like due to static electricity on the cover glass 31 Adsorption / adhesion of water is prevented.

  The ND filter unit 70 is assembled to the exterior cover unit 60 in the β direction (opposite to the α direction) by screwing at the attachment portions 12a to 12d (see FIG. 2A). At the time of assembly, the space between the cover glass unit 30 and the opening 11 of the ND filter unit 70 is charged by the elastic member 81. Therefore, the opening 11 of the ND filter unit 70 is sealed with the cover glass 31 and the elastic member 81.

  Since the opening 82 provided in the elastic member 81 is sufficiently larger than the opening 11 of the ND filter unit 70 as described above, the elastic member 81 does not hinder the passage of incident light from the lens.

  Next, a removal method when dust adheres to the ND filter 1 in the imaging apparatus having such a configuration will be described.

  FIG. 5A is an external perspective view of the apparatus main body 100 in which the interchangeable lens is not attached after the assembly is completed. FIG.5 (b) is an external appearance perspective view which shows the state which removed the cover glass unit 30 from the assembly completion state of Fig.5 (a).

  As shown in FIG. 5A, in the apparatus main body 100, the cover glass unit 30 and the exterior cover unit 60 are exposed to the outside. However, the ND filter unit 70 and the like are stored inside the apparatus main body 100 and externally. Is invisible.

  In order to remove the cover glass unit 30 from the state shown in FIG. 5A, first, the screws 66a to 66c at the three positions are removed with a screwdriver, and the knob portion 41 is pinched with tweezers and pulled. As a result, the cover glass unit 30 is removed from the apparatus main body 100 toward the subject.

  When the cover glass unit 30 is removed in this manner, in the apparatus main body 100, the ND filter 1 can be seen from the subject side through the opening 67 of the metal exterior 61 and the opening 11 of the ND filter unit 70 (see FIG. 1). It becomes like this. Since the ND filter 1 is exposed to the exterior, dust attached to the ND filter 1 can be blown away by blowing air or the like from the opening 11 to the ND filter 1.

  As described above, the cover glass unit 30 having the holding member 32 for holding the cover glass 31 is configured to be detachable from the subject side while the ND filter unit 70 is fixed to the exterior cover unit 60. Thereby, the ND filter 1 can be exposed to the external appearance by simply removing the cover glass unit 30 without performing a large-scale operation of disassembling the apparatus main body 100.

  Therefore, according to the present invention, if the cover glass unit 30 is removed and air is blown onto the ND filter 1 through the exposed opening 11, dust and the like adhering to the ND filter 1 can be reliably removed by a very simple operation. can do. Therefore, it is possible to easily remove dust and the like attached to the ND filter 1 that is an optical component disposed in a substantially sealed space inside the apparatus main body 100.

  Further, since the holding member 32 is provided with the knob portion 41, the cover glass unit 30 can be gripped from the subject side when the cover glass unit 30 is attached to and detached from the exterior cover unit 60, and attachment / detachment work is easy.

  Further, since the screw boss 68 is disposed at a position where it does not overlap the electrical contact 65 in the projection when viewed from the subject side, it is avoided that the electrical conduction function is impaired by the attachment and detachment of the holding member 32.

  Further, the pressing sheet metal 33 of the cover glass unit 30 contacts the cover glass 31 and also contacts the metal exterior portion 61 and the screw boss 68 of the exterior cover unit 60. Thereby, adsorption | suction and adhesion of dust etc. by the static electricity to the cover glass 31 are suppressed. From the viewpoint of adsorbing and adhering dust caused by static electricity, the conductive portion provided in the cover glass unit 30 may be in contact with the cover glass 31 and the metal portion of the exterior cover unit 60. .

  In addition, although the ND filter 1 was illustrated as an optical component that is a target for removing dust and the like, the present invention is not limited to this, and an optical component arranged in the internal space of the exterior can be targeted.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included.

DESCRIPTION OF SYMBOLS 1 ND filter 11 Opening part 30 Cover glass unit 31 Cover glass 32 Holding member 41 Knob part 60 Exterior cover unit 63 Lens mount 70 ND filter unit

Claims (4)

A lens mount for attaching an interchangeable lens, attached to the exterior part,
An optical unit having an optical component, fixed to the exterior portion, and having an opening through which an optical axis passes on the subject side of the optical component;
Holding a transparent member, and having a holding member configured to be removable from the subject side with respect to the exterior portion while the optical unit is fixed to the exterior portion,
When the holding member is attached to the exterior part, the transparent member closes the opening, and when the holding member is removed from the exterior part, the optical component can be seen from the subject side through the opening. An image pickup apparatus configured as described above.   The imaging apparatus according to claim 1, wherein the holding member has a knob portion that can be gripped from a subject side when being attached to and detached from the exterior portion.   The exterior portion is provided with an electrical contact for electrical connection with an interchangeable lens mounted on the lens mount, and a fastening portion for fastening the holding member is projected from the subject side. The imaging apparatus according to claim 1, wherein the imaging apparatus is provided at a position that does not overlap the electrical contact.   At least a part of the exterior part is made of metal, the holding member has a conductive part in contact with the transparent member, and the conductive part is included in the exterior part in a state where the holding member is attached to the exterior part. The imaging apparatus according to claim 1, wherein the imaging apparatus is in contact with a metal part.

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