JP2011191469A - Intermediate lens barrel - Google Patents

Abstract

An object of the present invention is to eliminate the need for an optical filter having a large aperture, to be inexpensive, and to obtain the effect of the optical filter without sacrificing portability.
An optical filter is incorporated in an intermediate barrel connected between a lens barrel side mount and a camera side mount and connecting the lens barrel side mount and the camera side mount. It is characterized in that a mechanism capable of rotating the built-in optical filter from the outside of the intermediate lens barrel is provided.
[Selection] Figure 1

Description

  The present invention relates to an intermediate lens barrel that is connected to a lens barrel-side mount and a camera-side mount and connects the lens barrel-side mount and the camera-side mount in a camera that can exchange lenses.

  When shooting a still image or video using a camera, the mount on the lens barrel and the mount on the camera are different, so the mount adapter that connects the mount on the lens barrel and the mount on the camera, or the lens barrel Tele-converter sandwiched between the lens barrel mount and camera mount to extend the focal length, close-up ring sandwiched between the lens barrel mount and camera mount when taking close-up shots, etc. There is an intermediate barrel that is used by being sandwiched between a lens barrel-side mount and a camera-side mount (for example, see Patent Document 1).

  In addition, a polarizing filter called a PL (Polarized Light) filter is attached to the front surface of the lens barrel in order to remove the reflection on the water surface and the glass and photograph a subject underwater or through the glass. There is an imaging technique in which the PL filter is rotated and adjusted to a rotation phase at which reflection is optimal for the image creation intention.

  In addition, as a means to produce shine in night scene shooting etc., a cross filter that can produce an effect of generating a stripe from a point light source is attached to the front surface of the lens barrel, and the light generated from the point light source is confirmed. There is an imaging technique in which a cross filter is rotated and adjusted to a rotation phase that is optimal for the purpose of drawing the strip.

JP 2002-82289 A

  In order to obtain the optical effect of the optical filter, when shooting with the optical filter attached to the front of the lens barrel, it is easy to use the optical filter for standard lenses and medium telephoto lenses with a relatively narrow angle of view and a small front lens diameter. However, in order to use an optical filter in front of a wide-angle lens with a wide angle of view, the wide-angle lens has a wide angle of view, so the optical filter is attached to the front of the lens barrel to prevent screen vignetting due to the optical filter. As a result, the optical filter itself becomes expensive and difficult to carry.

  In addition, optical filters that adjust the filter effect by rotating operations such as PL filters and cross filters are equipped with a rotation mechanism inside the optical filter. In order to prevent the screen from being vignetted by the optical filter due to the increase in thickness, it is necessary to increase the aperture of the optical filter, and the optical filter itself becomes more expensive and difficult to carry.

  Furthermore, in a fish-eye lens with an angle of view of around 180 degrees, an optical filter is attached to the front surface of the lens barrel, and in order not to cause vignetting on the screen, in order to avoid contact with the objective lens protruding forward, for example, a dome-shaped optical A filter is required, and such an optical filter has a problem that the optical filter itself is very expensive and difficult to carry.

  In addition, when using an optical filter attached to the filter screw on the front of the lens barrel and using it with multiple lens barrels with different filter screw diameters, multiple optical filters must be prepared according to different filter screw diameters. There was a problem that it became expensive and difficult to carry.

  In view of such problems, the intermediate lens barrel of the present invention is not required to use an optical filter having a large aperture, and is intended to be inexpensive and obtain the effect of the optical filter without sacrificing portability.

  In order to solve the above-mentioned problems, the present invention is connected between the lens barrel mount and the camera mount, and an optical filter is incorporated in the intermediate barrel connecting the lens barrel mount and the camera mount. The intermediate lens barrel includes a mechanism capable of rotating the built-in optical filter from the outside of the intermediate lens barrel.

  The intermediate lens barrel of the present invention does not require the use of an optical filter having a large aperture when using an optical filter with a wide-angle lens or a fisheye lens, and is inexpensive and does not sacrifice portability. Can be obtained.

  In addition, even optical filters that adjust the filter effect by rotating the PL filter, cross filter, etc., do not need to use an optical filter with a large aperture, and are inexpensive and do not sacrifice portability. An effect can be obtained.

  Even when using multiple lens barrels with different filter screw diameters, there is no need to prepare multiple optical filters with different filter screw diameters for each lens barrel, which is inexpensive and sacrifices portability. The filter effect by an optical filter can be acquired without doing.

Filter rotation mechanism assembly drawing Filter rotation mechanism exploded view Intermediate lens side view Intermediate lens barrel front view Intermediate lens rear view Lens lock part assembly drawing Lens barrel side view Lens barrel rear view Camera body front view Camera body side view Camera system exploded view Camera system assembly drawing

  FIG. 1 is an assembly view of a filter rotation mechanism of an intermediate lens barrel according to an embodiment of the present invention. In FIG. 1, the intermediate barrel body mount 12 and the intermediate barrel lens mount 22 are fixed to the intermediate barrel body 11 with screws. The filter holding ring 41 holds the optical filter 44. The operation gear 45 is inserted into the operation gear shaft 47 integrally with the operation roller 46 and can rotate around the operation gear shaft 47. The operation roller 46 is partially exposed from the intermediate lens barrel body 11 as shown in FIG. 1 and can be rotated from the outside of the intermediate lens barrel body 11.

  FIG. 2 is an exploded view of the filter rotation mechanism of the intermediate barrel of the present invention. In FIG. 2, the filter holding ring 41 holding the optical filter 44 is such that the pair of intermediate lens barrel sliding portions 41 a is on the left side of the paper with respect to the pair of filter holding ring sliding portions 11 a inside the middle barrel main body 11. The filter holding ring press-fitting portion 43b inserted from the direction of the subject and further on the outer periphery of the holding ring presser 43 is press-fitted into the pair of holding ring press-fitting pressurization portions 41b on the inner periphery of the filter holding ring 41 from the camera direction on the right side of the paper. By doing so, the intermediate lens barrel body 11 is fixed.

  The outer diameter of the intermediate lens barrel sliding portion 41a is slightly smaller than the inner diameter of the anti-filter holding ring sliding portion 11a, and the filter holding ring 41 holding the optical filter 44 is provided in the intermediate lens barrel body 11. Can rotate against.

  A unit in which the operation gear 45 and the operation roller 46 are integrated is inserted into the operation gear shaft 47 and can freely rotate around the operation gear shaft 47.

  Further, the filter holding ring outer peripheral gear 41c on the outer periphery of the filter holding ring 41 is meshed with the operation gear 45 as shown in FIG. 1, and by rotating the operation roller 46 from the outside of the intermediate lens barrel body 11, The operation gear 45 integrated with the operation roller 46 rotates the filter holding ring outer peripheral gear 41c, and the optical filter 44 held by the filter holding ring 41 can rotate. That is, the optical filter 44 can be rotated by rotating the operation roller 46 from the outside of the intermediate barrel main body 11.

  FIG. 3 is a side view of the intermediate barrel, and is an external view of the filter rotation mechanism assembly diagram of FIG. In FIG. 3, the intermediate barrel body mount 12 is provided with an intermediate barrel body mount lock pin 14. An intermediate barrel body mount release button 15 and an intermediate barrel lens mount index 23 are provided on the outer periphery of the intermediate barrel body 11.

  FIG. 4 is a front view of the intermediate barrel, and is a cross-sectional view of the intermediate barrel side view of FIG. 3 as viewed from the left side of the sheet, that is, from the lens barrel side. In FIG. 4, the operation gear 45 that can rotate around the operation gear shaft 47 meshes with the filter holding ring outer peripheral gear 41 c, and the optical filter 44 can be rotated by rotating the operation gear 45. On the inner periphery of the intermediate barrel body mount 12, an intermediate barrel body mount gap 12a, an intermediate barrel body mount gap 12b, and an intermediate barrel body mount gap 12c are provided. The intermediate barrel body mount 12 is provided with an intermediate barrel body mount index 13.

  FIG. 5 is a rear view of the intermediate barrel, and is a view of the side view of the intermediate barrel of FIG. 3 as viewed from the right side of the page, that is, from the camera body side. In FIG. 5, the operation roller 46 is partially exposed from the intermediate lens barrel body 11 and is integrated with the operation gear 45 shown in FIG. 4, so that the operation roller 46 is rotated from the outside of the intermediate lens barrel body 11. By doing so, the optical filter 44 can be rotated. In FIG. 5, an intermediate lens barrel mount claw 22a, an intermediate lens barrel mount claw 22b, and an intermediate lens barrel mount claw 22c are provided on the outer periphery of the intermediate lens barrel mount 22. The intermediate barrel lens mount 22 is provided with an intermediate barrel positioning slot 24.

  FIG. 6 is an assembly view of the lens lock portion, and is a cross-sectional view of the intermediate lens barrel side view of FIG. 3 with a phase where the intermediate lens barrel body mount lens lock pin 14 is a cross section. In FIG. 6, the intermediate lens barrel body mount lock pin 14 is held by a hole in the intermediate lens barrel body 11 and a hole in the intermediate lens barrel body mount 12. The length of the hole holding the intermediate barrel body mount lock pin 14 in the intermediate barrel body 11 and the length of the hole holding the intermediate barrel body mount lock pin 14 in the intermediate barrel body mount 12 are intermediate. The lens barrel body mount lock pin 14 is slightly longer than the total length of the lens barrel body mount lock pin 14, and the intermediate lens barrel body mount lock pin 14 can slide in the left-right direction on the paper surface, that is, in the optical axis direction. The intermediate barrel body mount release button spring 48 urges the intermediate barrel body mount lock pin 14 toward the left side of the sheet, that is, toward the lens barrel side. The intermediate barrel body mount release button 15 is held by a hole in the intermediate barrel body 11. The length of the hole holding the intermediate barrel body mount release button 15 in the intermediate barrel body 11 is slightly longer than the total length of the intermediate barrel body mount release button 15, and the intermediate barrel body mount release button 15 is It can slide in the vertical direction, that is, the direction orthogonal to the optical axis.

  The intermediate barrel body mount lock pin 14 is urged toward the lens barrel side by the intermediate barrel body mount release button spring 48. The intermediate barrel body mount lock pin 14 is attached to the intermediate barrel body mount release button inclined surface 15a. The contact of the 14 stepped portions prevents the intermediate lens barrel body mount lock pin 14 from protruding from the intermediate lens barrel body mount 12. The intermediate barrel body mount release button 15 can slide in a direction orthogonal to the optical axis, but by pressing the intermediate barrel body mount release button 15 downward on the page, that is, toward the optical axis center, the intermediate barrel body mount release button slope 15a pushes the stepped portion of the intermediate lens barrel body mount lock pin 14 and slides the intermediate lens barrel body mount lock pin 14 to the right side of the page, that is, the camera body side, and the intermediate lens barrel body mount lock pin 14 becomes the intermediate lens barrel body mount. 12 no longer protrudes from the front surface.

  That is, when the intermediate barrel body mount release button 15 is pushed toward the center of the optical axis, the intermediate barrel body mount lock pin 14 does not protrude from the front surface of the intermediate barrel body mount 12.

  FIG. 7 is a side view of the lens barrel. In FIG. 7, the lens barrel main body 1 is provided with a lens mount 2 and a lens barrel index 3.

  FIG. 8 is a rear view of the lens barrel, and is a view of the lens barrel side view of FIG. 7 as viewed from the right side of the sheet, that is, from the intermediate barrel side. In FIG. 8, a lens mount claw 2a, a lens mount claw 2b, and a lens mount claw 2c are provided on the outer periphery of the lens mount 2. The lens mount 2 is provided with a lens barrel positioning elongated hole 4.

  To attach the lens barrel main body 1 shown in FIG. 7 to the intermediate barrel main body 11 shown in FIG. 4, the phase of the lens barrel index 3 is aligned with the intermediate barrel body mount index 13, and the intermediate barrel body mount is mounted. The lens mount claw 2a, the lens mount claw 2b, and the lens on the outer periphery of the lens mount 2 are respectively connected to the intermediate lens barrel body mount gap 12a, the intermediate lens barrel body mount gap 12b, and the intermediate barrel body mount gap 12c on the inner circumference of the lens mount 2. The lens barrel main body 1 is rotated until the mount claw 2c is fitted and the intermediate lens barrel body mount lock pin 14 is fitted in the lens barrel positioning elongated hole 4.

  To remove the lens barrel body 1 shown in FIG. 7 from the intermediate barrel body 11 shown in FIG. 4, the intermediate barrel body mount release button 15 is pressed to attach the intermediate barrel body mount lock pin 14 to the intermediate barrel body mount 12. The lens barrel body 1 can be rotated by pulling it in from the front surface of the lens barrel, and the lens barrel body 1 is removed after rotating the lens barrel body 1 by a predetermined angle.

  FIG. 9 is a front view of the camera body. FIG. 10 is a side view of the camera body. In FIG. 9, the camera body 31 is provided with a camera body mount 32 and a camera body mount index 33. On the inner periphery of the camera body mount 32, a camera body mount gap 32a, a camera body mount gap 32b, and a camera body mount gap 32c are provided. The camera body mount 32 is provided with a camera body mount lock pin 34. The camera body 31 is provided with a camera body mount release button 35.

  To attach the intermediate lens barrel body 11 shown in FIG. 5 to the camera body 31 shown in FIG. 9, the phase of the intermediate lens barrel lens mount index 23 is aligned with the camera body mount index 33, and the inner circumference of the camera body mount 32 is adjusted. In the camera body mount gap 32a, camera body mount gap 32b, and camera body mount gap 32c, the intermediate barrel lens mount claw 22a, the intermediate barrel lens mount claw 22b, and the intermediate mirror on the outer periphery of the intermediate barrel lens mount 22, respectively. The tube lens mount claw 22c is fitted, and the intermediate lens barrel body 11 is rotated until the camera body mount lock pin 34 is fitted in the intermediate lens barrel positioning long hole 24.

  To remove the intermediate lens barrel body 11 shown in FIG. 5 from the camera body 31 shown in FIG. 9, the camera body mount release button 35 is pushed and the camera body mount lock pin 34 is pulled in from the front surface of the camera body mount 32. The lens barrel body 11 can be rotated, and after the intermediate lens barrel body 11 is rotated by a predetermined angle, the intermediate lens barrel body 11 is removed.

  FIG. 11 is an exploded view of the camera system of the present invention. FIG. 12 is an assembly diagram of the camera system of the present invention. 11 and 12, the intermediate lens barrel body 11 is assembled by being sandwiched between the lens barrel main body 1 and the camera body 31, so that the intermediate lens barrel main body 11 is interposed between the lens barrel 1 and the camera body 31. An optical filter that can be rotated from the outside can be configured.

  When the intermediate lens barrel of the present invention is used, when an optical filter is used with a wide-angle lens or a fish-eye lens to obtain the effect of the optical filter, there is no need to use an optical filter with a large aperture, and the optical filter is inexpensive and does not sacrifice portability. The effect by can be acquired. In addition, even optical filters that adjust the filter effect by rotating the PL filter, cross filter, etc., do not need to use an optical filter with a large aperture, and are inexpensive and do not sacrifice portability. An effect can be obtained. Even when using multiple lens barrels with different filter screw diameters, there is no need to prepare multiple optical filters with different filter screw diameters for each lens barrel, which is inexpensive and sacrifices portability. The filter effect by an optical filter can be acquired without doing.

  The present invention can be applied to a case where it is desired to express a video effect by a rotation operation of an optical filter as a drawing intention when shooting a still image or a moving image using an intermediate lens barrel.

1 Lens barrel body 2 Lens mount 2a Lens mount claw a
2b Lens mount claw b
2c Lens mount claw c
Reference Signs List 3 Lens barrel index 4 Lens barrel positioning slot 11 Intermediate barrel main body 11a Counter sliding ring sliding portion 12 Intermediate barrel body mount 12a Intermediate barrel body mount gap a
12b Intermediate barrel body mount gap b
12c Intermediate barrel body mount clearance c
13 Intermediate barrel body mount index 14 Intermediate barrel body mount lock pin 15 Intermediate barrel body mount release button 15a Intermediate barrel body mount release button slope 22 Intermediate barrel lens mount 22a Intermediate barrel lens mount claw a
22b Intermediate barrel lens mount claw b
22c Intermediate lens barrel lens mount claw
23 Intermediate barrel lens mount index 24 Intermediate barrel positioning slot 31 Camera body 32 Camera body mount 32a Camera body mount gap a
32b Camera body mount gap b
32c Camera body mount clearance c
33 Camera body mount index 34 Camera body mount lock pin 35 Camera body mount release button 41 Filter retaining ring 41a Intermediary lens barrel sliding portion 41b Counter retaining ring press-fitting portion 41c Filter retaining ring outer peripheral gear 43 Holding ring retainer 43b Counter holding Ring press-fit section 44 Optical filter 45 Operation gear 46 Operation roller 47 Operation gear shaft 48 Intermediate barrel body mount release button spring

Claims (1)

In a camera in which the lens barrel can be exchanged, the intermediate barrel is connected between the lens barrel side mount and the camera side mount, and connects the lens barrel side mount and the camera side mount. An intermediate lens barrel having an optical filter that can be rotated from outside the intermediate lens barrel.

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