JP2014048465A - Optical accessory, lens barrel, and optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized optical accessory which does not affect the performance of a lens barrel.SOLUTION: An optical accessory 100 includes: moving ring holding means 2 attachable to a lens barrel 5; optical holding means 1 so configured as to hold an optical member 3 and having driven means 1a; and a spring member 6 for energizing the optical holding means 1 toward the moving ring holding means 2, wherein the optical holding means 1 moves on a face cum 4a, in which the driven means 1a is formed on a driving ring 4, in association with rotation of the driving ring 4 of the lens barrel 5 so that it moves in accordance with forward and backward motions of the lens barrel 5.

Description

  The present invention relates to an optical accessory attached to an optical apparatus such as a digital camera.

  2. Description of the Related Art In recent years, there are optical devices capable of photographing with a variety of changes by attaching accessories such as various optical filters and macro lenses to an optical device (lens barrel). In such a lens barrel, the amount of protrusion from the main body (imaging device main body) changes according to the change in zoom magnification. For this reason, in order to attach accessories such as an optical filter and a macro lens to the lens barrel, a large optical accessory is required in consideration of the protruding amount, which is difficult for the user to handle.

  Patent Document 1 discloses a waterproof camera including a lens barrel that can advance and retract in the optical axis direction and a mount attached to the front surface of the camera body. In the waterproof camera of Patent Document 1, a wide converter is provided at a position where it does not interfere with the lens barrel via a waterproof adapter. Patent Document 2 discloses a filter adapter that is extrapolated to a lens barrel and attaches an optical filter to the front surface of the lens barrel. This filter adapter applies an optical filter in conjunction with the lens barrel by pressing a part of the movable barrel against the front of the lens barrel and pressing the front of the lens barrel against the biasing force of the biasing member. Move.

JP 2010-72225 A JP 2012-37718 A

  However, in the configuration disclosed in Patent Document 1, since the large waterproof adapter is arranged even when the lens barrel is not extended largely, the waterproof camera is increased in size and is difficult for the user to handle. In the configuration disclosed in Patent Document 2, an external force is applied to the lens barrel during the zoom operation, and the load force on the lens barrel changes depending on whether the filter adapter is attached or not, and the photographing performance is increased. May be affected.

  Therefore, the present invention provides a small optical accessory, a lens barrel, and an optical device that do not affect the performance of the lens barrel.

  An optical accessory according to one aspect of the present invention includes a base member that can be attached to a lens barrel, a holding member that is configured to hold the optical member, has a protrusion, and the holding member faces the base member. Urging means for urging, and the holding member moves on the cam portion formed on the drive ring in conjunction with the rotation of the drive ring of the lens barrel, The lens barrel moves in the direction of the optical axis in accordance with the advancing and retracting operation of the lens barrel.

  A lens barrel according to another aspect of the present invention includes a lens unit, a drive ring that moves the lens unit in the optical axis direction by rotating, and a tapered cam portion formed on the drive ring. The cam portion changes the contact position between the projection portion of the optical accessory and the cam portion in conjunction with the rotation of the drive ring, so that the optical accessory is moved in accordance with the advancing / retreating operation of the lens barrel. It is configured to move in the optical axis direction.

  An optical device according to another aspect of the present invention includes a lens unit, a drive ring that rotates to move the lens unit in the optical axis direction, a tapered cam portion formed on the drive ring, and the drive A base member attachable to the ring; a holding member configured to hold the optical member and having a protrusion configured to contact the cam portion; and urging the holding member toward the base member And a biasing means that moves the lens barrel in accordance with the advancing / retreating operation of the lens barrel by changing a contact position between the projection and the cam in conjunction with rotation of the drive ring. It moves in the optical axis direction.

  Other objects and features of the present invention are illustrated in the following examples.

  According to the present invention, it is possible to provide a small optical accessory, a lens barrel, and an optical device that do not affect the performance of the lens barrel.

It is a perspective view of the optical accessory in a present Example. In a present Example, it is a side view of the optical accessory when a lens-barrel is a accommodation state (when not in use). In a present Example, it is a side view of the optical accessory when a lens-barrel is a telephoto state (at the time of use). It is a front perspective view of the imaging device in a present Example. It is a rear view of the imaging device in a present Example. It is a block diagram which shows the principal part of the imaging device in a present Example.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same members are denoted by the same reference numerals, and redundant description is omitted.

  First, the configuration of an imaging apparatus (digital camera) in an embodiment of the present invention will be described with reference to FIGS. 3a, 3b, and 4. FIG. FIG. 3A is a front perspective view of the digital camera 13 in the present embodiment. FIG. 3 b is a rear view of the digital camera 13. FIG. 4 is a block diagram showing the main part of the digital camera 13. The digital camera 13 of the present embodiment is a camera having a zoom mechanism that can change the photographing magnification.

  In the present embodiment, an imaging apparatus in which an imaging apparatus main body including an imaging element and a lens barrel are integrally configured will be described, but the present invention is not limited to this. The present embodiment is also applicable to an interchangeable lens in which a lens barrel is configured to be detachable from the imaging apparatus main body, and an imaging system in which an interchangeable lens is attached to the imaging apparatus main body.

  In front of the digital camera 13, a finder objective lens 11 for determining the composition of the subject, auxiliary light means 10 for assisting a light source in performing photometric operation and distance measuring operation, a strobe 12, and a lens barrel 5 (lens Device). A release button 7, a zoom changeover switch 8, and a power supply changeover button 9 are provided on the upper surface of the digital camera 13. On the back of the digital camera 13, operation buttons 16, 17, 18, 19, 20, and 21 for performing various function switching are provided. Further, a display 15 made of LCD and a viewfinder eyepiece 14 are provided. The display 15 is an image display means, and displays the image data stored in the memory 33 and the image data read from the memory card on the screen.

  The CPU 39, the ROM 38, and the RAM 40 constitute a control unit (control system). The control unit is connected to various components such as the release button 7, the operation buttons 16 to 21, the display 15, the memory 33, and the memory card drive 35 via the bus 37. The control unit is connected to the drive circuit 36 via the bus 37. The drive circuit 36 is connected to the zoom mechanism 22, the focus drive mechanism 23, the shutter drive mechanism 26, the aperture drive mechanism 28, the image sensor 30 such as a CCD or CMOS, and the strobe 12. These driving units drive each of them by a command signal from the control unit via the driving circuit 36. The zoom mechanism 22 drives the lens barrel 5 using a motor 22a. The focus drive mechanism 23 drives the focus lens 24 using a motor 23a. The shutter drive mechanism 26 drives the shutter 25. The diaphragm drive mechanism 28 drives the diaphragm 27.

  The ROM 38 stores a program (control program) for controlling various components as described above. The RAM 40 stores data necessary for various control programs.

  The analog signal processing unit 29 performs predetermined analog processing on the image data obtained from the image sensor 30 and outputs the result to the A / D conversion unit 31. The A / D converter 31 converts the analog data obtained from the analog signal processor 29 into digital data. The A / D converter 31 outputs this digital data to the digital signal processor 32. The digital signal processing unit 32 performs predetermined signal processing on the digital data. After the signal processing is performed by the digital signal processing unit 32, the digital data is stored in the memory 33.

  The compression / decompression unit 34 performs decompression processing on image data stored in the memory 33 and image data stored in the memory card drive 35. The image data that has been decompressed by the compression / decompression unit 34 is displayed on the display 15 via the bus 37. When the user views the image data displayed on the display 15 and determines that the image data is not necessary, the user can operate the operation button 21 to delete the image data.

  Next, an optical accessory (optical adapter) that can be attached to the digital camera 13 (lens barrel) will be described with reference to FIG. FIG. 1 is a perspective view of an optical accessory 100 in this embodiment, and shows a state in which the optical accessory 100 is attached to a digital camera 13 (lens barrel). In this embodiment, the digital camera 13 (lens barrel 5) to which the optical accessory 100 is attached is called an optical device.

  The optical accessory 100 according to the present embodiment is an optical adapter such as a filter adapter configured to hold an optical member such as an optical filter, and is attached to the digital camera 13 (lens barrel 5) as an external accessory. By attaching various filters such as a polarizing filter and a protection filter to the optical accessory 100, the user can enjoy various shootings.

  In the compact camera (digital camera 13), the front surface (object side surface) of the lens barrel 5 moves in the direction of the optical axis OA (optical axis direction) in accordance with the change in zoom magnification. If the optical accessory (filter adapter) is fixed at a position where it does not interfere with the lens barrel 5, there is no problem on the telephoto side, but the diameter and length of the optical accessory must be increased to prevent vignetting on the wide-angle side. There is a need to. When the diameter and length of the optical accessory are increased, the usability as a camera is lowered, and the attractiveness for the user is reduced. Therefore, in this embodiment, the optical accessory holding the filter and the protector is moved in the optical axis direction along with the movement of the front surface of the lens barrel 5.

  The optical accessory 100 mainly includes an optical holding means 1 (holding member), a moving ring holding means 2 (base member), and a spring member 6 (biasing means). The moving ring holding means 2 is configured to be attachable to the lens barrel 5. The moving ring holding means 2 is fixed to the lens barrel 5 regardless of the forward / backward movement of the lens barrel 5 by being attached to the lens barrel 5.

  An optical holding means 1 is provided on the outer periphery of the moving ring holding means 2. The optical holding means 1 is linearly restricted (straightly held) by a straight advance restriction means 2 a provided in the moving ring holding means 2. A fixing means such as a screw (not shown) for attaching a filter (optical member 3) such as a polarizing filter or a protection filter is provided on the front surface (object side) of the optical holding means 1. Further, on the back surface (image side) of the optical holding means 1, there are provided protruding driven means 1 a (protruding portions) at a plurality of locations in the circumferential direction. In this embodiment, the driven means 1a is provided at three locations, but is not limited to this. As described above, the optical holding unit 1 is configured to hold the optical member 3 and includes the driven unit 1a.

  Between the optical holding means 1 and the moving ring holding means 2, spring members 6 (biasing means) are provided at three locations in the circumferential direction. For this reason, the optical holding means 1 and the moving ring holding means 2 are in a mutually attractive relationship. That is, the spring member 6 biases the optical holding means 1 toward the moving ring holding means 2. With this configuration, the optical holding unit 1 is subjected to a predetermined load in the back direction (image side). The number of spring members 6 is not limited to three and can be changed as appropriate.

  The lens barrel 5 is provided with a drive ring 4 for moving optical means such as a lens unit provided in the lens barrel 5 in the optical axis direction. A face cam 4a (cam member) having a taper shape with respect to the optical axis direction is provided in front of the drive ring 4 (object side). As the drive ring 4 rotates, the lens barrel 5 changes to a wide-angle state, a telephoto state (collectively referred to as “imaging state”), and a storage state. At this time, the face cam 4a also rotates and changes its position. When the optical accessory 100 is attached to the digital camera 13 (lens barrel 5), the driven means 1a is inserted into the lens barrel 5 and held so as to be in contact with the face cam 4a.

  Next, with reference to FIGS. 2a and 2b, a change in the structure of the optical accessory 100 according to the position of the lens barrel 5 (the housed state, the wide angle state, and the telephoto state) will be described. FIG. 2 a is a side view of the optical accessory 100 when the lens barrel 5 is stored (when not in use). FIG. 2B is a side view of the optical accessory 100 when the lens barrel 5 is in the telephoto state (when in use). In addition, when the lens barrel 5 is in a wide angle state, it is the same as FIG.

  As shown in the enlarged view on the upper right in FIG. 2a, when the lens barrel 5 is in the retracted state or the wide-angle state, the driven means 1a is not in contact with the face cam 4a. The driven means 1a comes into contact with the face cam 4a while the lens barrel 5 performs a zoom operation and transits from the wide angle state to the telephoto state. With such a configuration, it is possible to prevent the load of the optical accessory 100 from affecting the lens barrel 5 when the digital camera 13 (lens barrel 5) is stored for a long time. Further, according to the present embodiment, the optical accessory 100 to which the optical member 3 such as an optical filter is attached is moved according to the advance / retreat operation of the lens barrel 5. For this reason, the optical member 3 can be brought close to the lens barrel 5 so that no vignetting occurs when the lens barrel 5 is in the wide-angle state.

  On the other hand, when the lens barrel 5 is in the telephoto state as shown in FIG. 2b, the optical accessory 100 prevents the front surface (object side) of the lens barrel 5 and the optical member 3 from interfering with each other (not to contact each other). (Ii) The lens barrel 5 moves in the direction of the optical axis in accordance with the forward / backward movement of the lens barrel 5. The drive ring 4 is located near the zoom mechanism 22 on the force transmission path from the zoom mechanism 22 and has little mechanical backlash. For this reason, the operation error due to the load from the front (object side) of the drive ring 4 is small, and the influence on the optical performance and the mechanical mechanism can be reduced.

  As described above, the optical holding means 1 of the optical accessory 100 moves the driven means 1 a on the face cam 4 a formed on the driving ring 4 in conjunction with the rotation of the driving ring 4 of the lens barrel 5. Thus, the lens barrel 5 moves in the optical axis direction in accordance with the advancing / retreating operation of the lens barrel 5. In particular, in the present embodiment, the contact position between the driven means 1 a and the tapered face cam 4 a formed on the drive ring 4 changes in the optical holding means 1 in conjunction with the rotation of the drive ring 4. Since the face cam 4a has a tapered shape that is a structure inclined in the optical axis direction, the optical holding means 1 is extended in the optical axis direction as the lens barrel 5 moves from the wide-angle side to the telephoto side.

  With such a configuration, according to the present embodiment, it is possible to provide a small optical accessory, a lens barrel, and an optical device that do not affect the performance of the lens barrel.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

1 Optical holding means (holding member)
1a Driven means (protrusion)
2 Moving ring holding means (base member)
4a Face cam (cam part)
5 Lens barrel 6 Spring member (biasing means)

Claims (7)

A base member attachable to the lens barrel;
A holding member configured to hold an optical member and having a protrusion;
Biasing means for biasing the holding member toward the base member,
The holding member moves in accordance with the rotation of the driving ring of the lens barrel, and the projection moves on the cam portion formed on the driving ring, so An optical accessory that moves in the axial direction.   The holding member changes the contact position between the protrusion and the tapered cam portion formed on the drive ring in conjunction with the rotation of the drive ring of the lens barrel. 2. The optical accessory according to claim 1, wherein the optical accessory moves in the direction of the optical axis in accordance with a forward / backward movement of the cylinder.   The optical accessory according to claim 1, wherein the holding member is extended in the optical axis direction as the lens barrel moves from the wide-angle side to the telephoto side.   The optical accessory according to any one of claims 1 to 3, wherein the holding member is linearly restricted in the optical axis direction by a linearly restricting means provided in the base member.   5. The projection according to claim 1, wherein the protrusion of the holding member is configured not to contact the drive ring when the lens barrel is in a retracted state or a wide-angle state. Optical accessories. A lens unit;
A drive ring that moves the lens unit in the optical axis direction by rotating;
A tapered cam portion formed on the drive ring,
The cam portion changes the contact position between the projection portion of the optical accessory and the cam portion in conjunction with the rotation of the drive ring, so that the optical accessory is moved along the optical axis in accordance with the forward / backward movement of the lens barrel. A lens barrel configured to move in a direction. A lens unit;
A drive ring that moves the lens unit in the optical axis direction by rotating;
A tapered cam portion formed on the drive ring;
A base member attachable to the drive ring;
A holding member configured to hold an optical member and having a protrusion configured to contact the cam portion;
Biasing means for biasing the holding member toward the base member,
The holding member moves in the optical axis direction according to the advancing / retreating operation of the lens barrel by changing a contact position between the projection and the cam portion in conjunction with rotation of the drive ring. An optical device characterized by the above.