JP2012137526A - Lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent application of a subject luminous flux to an FPC and interference of a movable lens in a simple configuration, and to provide a mechanism improving workability when the FPC is pulled out from a hole of a lens barrel to the outside.SOLUTION: A zoom lens barrel is formed with a hole 33 penetrating in an optical axis direction between a fixed barrel 29 and a plate-like part 36 disposed at the outer periphery part of the fixed barrel 29 for pulling out an FPC 10 from the inside to the outside. When the lens barrel is moved between a collapsed position and a photographing position in the optical axis direction, the FPC 10 is guided in the optical axis direction by the hole 33.

Description

  The present invention relates to a zoom lens barrel that is mounted on an imaging apparatus such as a digital camera and moves in the optical axis direction between a retracted position and a photographing position to change a photographing magnification.

  In some zoom lens barrels, an electromagnetic driving unit that drives a diaphragm and a shutter is displaced in the optical axis direction together with the diaphragm and the shutter.

  By the way, since the electromagnetic drive unit is connected to the main substrate of the camera body via the flexible printed circuit board, the flexible printed circuit board bends when the electromagnetic drive unit is displaced in the optical axis direction.

  A specific description will be given with reference to FIG. FIG. 6 is a cross-sectional view when the conventional zoom lens barrel is in the middle between the wide position and the tele position.

  As shown in FIG. 6, the flexible printed circuit board 101 connected to the electromagnetic drive unit is pulled out from the inside of the lens barrel through a hole 106 formed so as to penetrate in a direction orthogonal to the optical axis direction. Then, it is connected to the main board of the camera body via the connector 108 and the like. Then, the luminous flux 107 of the subject passes through the first group lens 103 and the second group lens 104 and forms an image on the image sensor 102 via the third group lens 105.

  However, as described above, when the flexible printed circuit board 101 is bent when the electromagnetic driving unit is displaced in the optical axis direction, the subject light beam 107 is reflected by the flexible printed circuit board 101 in a bent state, and the third group lens 105 is reflected. The light may pass through and reach the image sensor 102. In this case, it becomes a cause which causes deterioration of a picked-up image as a ghost.

  Further, as shown by a broken line in FIG. 6, when the third group lens 105 moves to the object side in the optical axis direction for focus adjustment, the third group lens 105 is placed on the flexible printed circuit board 101 that is bent. There is a risk of interference, which causes the focus adjustment accuracy to deteriorate.

  Therefore, in order to eliminate such inconvenience, a technique has been proposed in which a guide member that suppresses the protrusion of the flexible printed circuit board into the lens barrel is provided (Patent Document 1).

  In addition, a technique has been proposed in which the guide roller around which the flexible printed board is wound is moved in accordance with the movement in the optical axis direction of the shutter unit to which the flexible printed board is connected to absorb the flexure of the flexible printed board (patent). Reference 2).

JP 2001-264609 A JP 2001-188289 A

  However, in Patent Document 1, since a guide member is required, the structure is complicated and the lens barrel is prevented from being downsized. Further, since it is necessary to pull out the flexible printed board from the hole of the lens barrel through the guide member, the drawing work becomes troublesome.

  Also, in Patent Document 2, a guide roller and a guide member for guiding the guide roller are required, so that the structure is complicated and the lens barrel is prevented from being downsized. Further, since it is necessary to pull out the flexible printed circuit board from the hole of the lens barrel through the guide roller, the drawing operation becomes troublesome.

  Therefore, the present invention prevents the subject luminous flux from hitting a flexible substrate with a simple structure and prevents the movable lens from interfering with the substrate, and also pulls the substrate out of the lens barrel hole. The purpose is to provide a mechanism to improve the workability.

  In order to achieve the above object, a lens barrel of the present invention is a zoom type lens barrel that moves in the optical axis direction between a retracted position and a photographing position to change a photographing magnification, and A hole penetrating in the optical axis direction for pulling out the flexible substrate from the inside to the outside is formed between the plate-like portion arranged on the outer peripheral portion of the fixed cylinder, and the retracted position and the photographing position When the substrate is moved in the direction of the optical axis, the substrate is guided in the direction of the optical axis by the hole.

  According to the present invention, it is possible to prevent a subject light beam from hitting a flexible substrate with a simple structure and prevent the movable lens from interfering with the substrate, and to remove the substrate from the lens barrel hole. The workability at the time of drawing out can be improved.

It is the figure which looked at the lens barrel which is an example of embodiment of this invention from the to-be-photographed object side of the optical axis direction. It is the sectional view on the AA line of FIG. It is sectional drawing in the state which has a lens-barrel in a wide position. It is sectional drawing in the state which has a lens-barrel in a tele position. It is sectional drawing in the state which has a lens-barrel in the middle position of the middle of a wide position and a tele position. It is sectional drawing when the conventional zoom type lens barrel exists in the middle of a wide position and a tele position.

  Hereinafter, a lens barrel as an example of an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a view of a lens barrel as an example of an embodiment of the present invention viewed from the subject side in the optical axis direction, and FIG. 2 is a cross-sectional view taken along line AA of FIG. 1 and 2 show the retracted state of the lens barrel.

  As shown in FIGS. 1 and 2, in the lens barrel of this embodiment, a flexible printed board (hereinafter referred to as FPC) 10 having flexibility is formed between a fixed cylinder 29 and a plate-like portion 36. It is pulled out from the hole 33 and connected to the connector 12 mounted on the relay board 11. The relay board 11 is connected to a main board of a camera body (not shown). The FPC 10 drawn out from the hole 33 may be directly connected to the main board.

  Next, the basic structure of the lens barrel will be briefly described with reference to FIG. As shown in FIG. 2, the lens barrel is a zoom type that moves in the optical axis direction between the retracted position and the photographing position to change the photographing magnification, and a first group holder 21 that holds the first group lens 20. A second group holder 23 that holds the second group lens 22 and a third group holder 25 that holds the third group lens 24 are provided.

  The first group cam ring 26 has a cam groove for displacing the first group holder 21 in the optical axis direction on the inner peripheral surface. A cam follower pin is implanted in the first group holder 21, and the cam follower pin is cam-engaged with a cam groove of the first group cam ring 26. Similarly, the second group cam ring 27 has a cam groove for displacing the second group holder 23 in the optical axis direction on the inner peripheral surface. A cam follower pin is implanted in the second group holder 23, and the cam follower pin is cam-engaged with a cam groove of the first group cam ring 27.

  The movable cam ring 28 has a cam groove for displacing the first group cam ring 26 and the second group cam ring 27 in the optical axis direction on the inner peripheral surface. The fixed cylinder 29 has a cam groove for displacing the movable cam ring 28 in the optical axis direction on the inner peripheral surface. The movable cam ring 28 has a cam follower pin that is cam-engaged with the cam groove of the fixed cylinder 29 on the outer peripheral surface thereof, and is driven to rotate by a drive source (not shown). Thereby, the moving cam ring 28 moves in the optical axis direction while rotating along the cam groove of the fixed cylinder 29.

  The first group cam ring 26 and the second group cam ring 27 are key-coupled to the moving cam ring 28 so as to rotate as the moving cam ring 28 rotates. Further, the first group holder 21 and the second group holder 23 are guided by the moving cam ring 28 so as not to rotate, so that the first group holder 21 and the second group holder 23 are changed according to the rotation of the moving cam ring 28. Move in the direction of the optical axis.

  In the present embodiment, the third group lens 24 is constituted by a focus lens and is driven in the optical axis direction by a screw feed mechanism (not shown) that is controlled based on an instruction from the main board of the camera body. The subject luminous flux that has passed through the first group lens 20, the second group lens 22, and the third group lens 24 forms an image on the image sensor 30 and is converted into an electrical signal.

  The shutter coil 31 is an electromagnetic drive unit that opens and closes the shutter 31a. The IS coil 32 generates a magnetic field by being energized, and together with a magnet (not shown) attached to the second group holder 23, the second group holder 23 having the second group lens 22 for correcting camera shake is orthogonal to the optical axis. Displace on the surface. Both the shutter coil 31 and the IS coil 32 move integrally with the second group holder 23 in the optical axis direction. One end of the FPC 10 is connected to the shutter coil 31 and the IS coil 32.

  Here, in the retracted state of the lens barrel shown in FIG. 2, the FPC 10 having one end connected to the shutter coil 31 and the IS coil 32 extends between the second group holder 23 and the second group cam ring 27 along the optical axis direction. And extending to the image sensor 30 side.

  Thereafter, the FPC 10 extends radially outward along the rear-side end faces of the second group cam ring 27, the first group cam ring 26, and the movable cam ring 28, and then extends toward the subject side along the optical axis direction. It is pulled out of the lens barrel through a hole 33 penetrating into the lens barrel.

  The FPC 10 pulled out to the outside is bent by approximately 180 ° at a position protruding from the end 35 on the subject side of the plate-like portion 36 by the dimension B toward the subject side, and the optical axis direction along the outer peripheral surface of the plate-like portion 36. It extends to the image sensor 30 side, and is connected to the connector 12 disposed on the outer periphery of the plate-like portion 36. That is, in the retracted state of the lens barrel, the FPC 10 is arranged to be bent by 180 ° at a position protruding from the subject side by the dimension B so as not to contact the end portion 35 of the plate-like portion 36.

  As described above, the connector 12 is mounted on the relay board 11 connected to the main board of the camera body, whereby the shutter coil 31 and the IS coil 32 are connected to the camera via the FPC 10, the connector 12, and the relay board 11. It is electrically connected to the main board of the main body.

  3 is a cross-sectional view when the lens barrel is in the wide position, FIG. 4 is a cross-sectional view when the lens barrel is in the tele position, and FIG. 5 is an intermediate view between the wide position and the tele position. It is sectional drawing in the state in a middle position.

  As shown in FIG. 3, when the lens barrel is extended from the retracted position to the wide position, the FPC 10 is guided in the optical axis direction by a hole 33 formed between the fixed cylinder 29 and the plate-like portion 36. The This is because the end portion 35 of the plate-like portion 36 that restricts the movement of the FPC 10 to the imaging surface side is closer to the subject side than the end portion 34 of the fixed tube 29 that restricts the movement of the FPC 10 to the subject side in the hole 33. It is because it is arranged in.

  In other words, the FPC 10 is guided in the optical axis direction by the hole 33 formed by the subject-side portion 36 a (hatched portion) from the end portion 34 of the plate-like portion 36 on the fixed tube 29 side and the outer peripheral surface of the fixed tube 29. . Thereby, the bending of the FPC 10 when the shutter coil 31 and the IS coil 32 move in the optical axis direction integrally with the second group holder 23 can be suppressed.

  Further, in the telescopic state of the lens barrel shown in FIG. 4, the length of the FPC 10 is determined based on the tele position, so that the FPC 10 does not bend more than necessary inside the lens barrel. Further, in the middle state of the lens barrel shown in FIG. 5, the FPC 10 is guided in the optical axis direction by the hole 33 as in the wide state of FIG. 3, and the bending inside the lens barrel is suppressed.

  The FPC 10 indicated by a broken line in FIG. 3 is shown for comparison with the conventional example. In the conventional example, since the FPC 10 is drawn out from a hole formed in a direction perpendicular to the optical axis with respect to the fixed cylinder 29, the FPC 10 is not guided in the optical axis direction in the vicinity of the hole A in the lens barrel. It will be greatly bent inward in the radial direction of the cylinder.

  Next, a method for pulling out the FPC 10 from the inside of the lens barrel to the outside will be described. When the FPC 10 is pulled out from the hole 33, it is necessary to pull it out in consideration of the length of insertion of the FPC 10 into the connector 12.

  For this reason, the FPC 10 is pulled out from the hole 33 in the wide or middle state of the lens barrel having a sufficient length for pulling out the FPC 10. At this time, in the present embodiment, since the hole 33 penetrates in the optical axis direction, the hole 33 can be easily seen from the image pickup element 30 side to the subject side inside the lens barrel, and the insertion position of the FPC 10 Is easier to check.

  As described above, in the present embodiment, since the bending of the FPC 10 in the lens barrel can be suppressed, it is possible to prevent the FPC 10 from being exposed to the subject luminous flux, and the third group holder 25 and the FPC 10. Interference can be avoided.

  In the present embodiment, the FPC 10 is pulled out from a hole 33 formed between the fixed cylinder 29 and the plate-like portion 36 and penetrating in the optical axis direction. Therefore, the bending of the FPC 10 in the lens barrel can be suppressed with a simple structure without requiring a new member, and the workability when the FPC 10 is pulled out from the inside of the lens barrel is improved. Can be improved.

  Further, in the present embodiment, since the plate-like portion 36 is arranged extending in the optical axis direction toward the subject side, the area of the outer peripheral surface of the plate-like portion 36 is relatively large. For this reason, the freedom degree at the time of arrange | positioning the connector 12 to the outer peripheral surface of the plate-shaped part 36 improves, and installation of the fixing means of the connectors 12, such as a dowel, becomes easy.

  Further, in the present embodiment, the FPC 10 pulled out from the hole 33 is bent by approximately 180 ° at a position protruding from the end 35 on the subject side of the plate-like portion 36 to the subject side by a dimension B, and is bent by the plate-like portion 36. The optical axis direction extends toward the image sensor 30 along the outer peripheral surface of the connector 12 and is connected to the connector 12. For this reason, the workability | operativity at the time of inserting FPC10 in the connector 12 can be improved.

  Furthermore, in the present embodiment, the FPC 10 drawn out from the hole 33 protrudes from the subject-side end portion 35 of the plate-like portion 36 by the dimension B to the subject side. For this reason, the load concerning the connection part of the connector 12 can be reduced, and the poor contact between the FPC 10 and the connector 12 can be prevented.

  The configuration of the present invention is not limited to that exemplified in the above embodiment, and the material, shape, dimensions, form, number, arrangement location, and the like can be changed as appropriate without departing from the scope of the present invention. It is.

DESCRIPTION OF SYMBOLS 10 Flexible printed circuit board 12 Connector 29 Fixed cylinder 33 Hole 36 Plate-shaped part

Claims (3)

A zoom lens barrel that moves in the optical axis direction between the retracted position and the shooting position to change the shooting magnification,
Between the fixed cylinder and the plate-like portion disposed on the outer peripheral portion of the fixed cylinder, a hole penetrating in the optical axis direction for drawing the flexible substrate from the inside to the outside is formed,
The lens barrel, wherein the substrate is guided in the optical axis direction by the hole when moving between the retracted position and the photographing position in the optical axis direction.   In the hole, the end of the plate-like part that restricts the movement of the substrate to the imaging surface side is arranged closer to the subject than the end of the fixed cylinder that restricts the movement of the substrate to the object side. The lens barrel according to claim 1.   The lens barrel according to claim 1, wherein a connector to which the substrate is connected is disposed on an outer peripheral portion of the plate-like portion.

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