JP2015022009A - Lens barrel and imaging device. - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel and an imaging device that substantially prevent harmful light from intruding, while made thin.SOLUTION: A lens barrel 1000 comprises: a barrier blade 120 that openably and closably covers a shooting aperture; a barrier drive member 140 that causes the barrier blade to be opened and closed; a first group lens holding member 150 that holds the barrier drive member 140 rotatably centering around an optical axis; and a rectilinear barrel 700 that linearly regulates the first group lens holding member 150 in an optical axis direction, and causes the first group lens holding member 150 to be rotated centering around the optical axis with the first group lens holding member engaged with the barrier drive member 140. On the rectilinear barrel 700 in a state where the barrier blade 120 remains closed, a wall part 705 is provided at a position adjacent to an engagement part 706 engaging with an engagement part 141 of the barrier drive member 140.

Description

  The present invention relates to a lens barrel having a barrier mechanism that covers a photographing opening so as to be openable and closable in order to protect the photographing lens.

  Conventionally, as this type of lens barrel, the following is known (see Patent Document 1).

  A barrier blade that covers the photographing opening of the barrier cover and a barrier drive member that opens and closes the barrier blade are provided, and a barrier drive spring is provided between the barrier blade and the barrier drive member. The barrier driving member is held by the first group barrel so as to be rotatable about the optical axis. The first group barrel is held by the moving member so as to be relatively movable in the optical axis direction, and is driven by the rotary barrel in the optical axis direction. The

  When the barrier shifts from the fully closed state to the fully open state, the barrier drive member is rotated to the fully open position while pushing the barrier blade by the tension of the barrier drive spring.

  On the contrary, when the barrier shifts from the fully open state to the fully closed state, the relative distance in the optical axis direction between the moving member and the first group lens barrel is reduced by the rotating cylinder, so that the barrier driving member is moved to the fully closed position by the moving member. And the barrier blade is biased in the closing direction by the tension of the barrier drive spring. At this time, the distal end portion of the moving member that rotates the barrier driving member enters the storage space of the barrier blades in the fully opened state to achieve miniaturization.

JP 2008-33153 A

  However, in the lens barrel as in Patent Document 1, since the moving member enters the storage space of the barrier blade, the relative distance between the moving member and the first group lens barrel in the optical axis direction is reduced. For this reason, the first group lens barrel is largely cut away in order to avoid a bayonet portion that is provided on the moving member and holds the rotating cylinder so as to be relatively rotatable about the optical axis.

  As described above, when the cutout becomes large, harmful rays from the outside of the lens barrel easily enter and may appear in the image.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a lens barrel and an image pickup apparatus that are not easily penetrated by harmful rays while being thin.

  A barrier blade 120 that covers the photographing aperture so that it can be opened and closed, a barrier driving member 140 that opens and closes the barrier blade, a first group lens holding member 150 that holds the barrier driving member 140 rotatably about the optical axis, and the first group In a lens barrel 1000 that includes a linear barrel 700 that restricts the lens holding member 150 from moving straight in the optical axis direction and engages with the barrier driving member 140 to rotate around the optical axis, the barrier blade 120 is closed. The wall portion 705 is provided in a position adjacent to the engaging portion 706 that engages with the engaging portion 141 of the barrier driving member 140 in the rectilinear cylinder 700.

  According to the present invention, it is possible to provide a lens barrel in which harmful rays are less likely to enter while being thinned.

Disassembled perspective view of lens barrel 1000 Sectional view in the retracted state of the lens barrel 1000 Sectional view of the lens barrel 1000 in the shooting state Enlarged sectional view of the lens barrel 1000 in the retracted state Enlarged sectional view of the lens barrel 1000 in the shooting state Front view of first group unit when barrier blade 120 is fully open Front view of first unit when barrier blade 120 is fully closed The perspective view in the imaging | photography state of the barrier drive member 140 and the rectilinear cylinder 700 The perspective view in the retracted state of the barrier driving member 140 and the rectilinear cylinder 700 The perspective view in the imaging state of the first group unit and the rectilinear cylinder 700

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  1 is an exploded perspective view of a lens barrel 1000 according to an embodiment of the present invention, FIG. 2 is a sectional view of the lens barrel 1000 in a retracted state, FIG. 3 is a sectional view of the lens barrel 1000 in a photographing state, and FIG. Is an enlarged sectional view of the lens barrel 1000 in the retracted state, FIG. 5 is an enlarged sectional view of the lens barrel 1000 in the photographing state, FIG. 6 is a front view of the first group unit when the barrier blade 120 is fully closed, and FIG. FIG. 8 is a perspective view of the barrier drive member 140 and the rectilinear cylinder 700 in a retracted state, and FIG. 9 is a perspective view of the barrier drive member 140 and the rectilinear cylinder 700 in a photographing state. 10 is a perspective view of the first group unit and the rectilinear cylinder 700 in a photographing state.

  In FIG. 1, reference numeral 150 denotes a first group lens holding member that holds the first group lens 100, and three follower pins 151 are integrally formed at 120 ° equally. Reference numeral 110 denotes a cover member having a photographing opening 111, and 120 denotes a barrier blade that covers the photographing opening 111 so as to be freely opened and closed.

  Reference numeral 140 denotes a barrier driving member that drives the barrier blade 120, and is held by the first group lens holding member so as to be relatively rotatable about the optical axis. A biasing member 130 is provided between the barrier blade 120 and the barrier driving member 140 and transmits a driving force.

  Reference numeral 210 denotes a second group lens holding member for holding the second group lens 200, and three follower pins 211 are formed integrally at 120 °.

  Reference numeral 310 denotes a third group lens holding member that holds the third group lens 300.

  Reference numeral 400 denotes an aperture shutter member that adjusts the amount of light during photographing. Also, three follower pins 401 are integrally formed at 120 ° equally.

  1 to 3, reference numeral 500 denotes an inner peripheral surface that is fitted with a follower pin 151 of the first group lens holding member 150, a follower pin 211 of the second group lens holding member 210, and a follower pin 401 of the aperture shutter member 400, respectively, in the optical axis direction. A cam cylinder having a first group cam groove 502, a second group cam groove 503, and an aperture shutter cam groove 504 to be moved. Further, the cam cylinder 500 has three follower pins 501 and a gear portion 502 which are integrally formed on the outer peripheral surface in 120 equal parts.

  Reference numeral 600 denotes a fixed cylinder having a cam groove 601 that fits on the inner peripheral surface with the follower pin 501 of the cam cylinder 500 and moves in the optical axis direction.

  In FIG. 10, reference numeral 700 denotes a rectilinear cylinder having rectilinear grooves 701, 702, and 703 for restricting the first group lens holding member 150, the second group lens holding member 210, and the aperture shutter member 400 to advance straight in the optical axis direction.

  The rectilinear cylinder 700 has a bayonet portion 704 for holding the cam cylinder 500 so as to be rotatable relative to the optical axis.

  Reference numeral 800 denotes an image sensor holding member that holds the image sensor 900, and drives the zoom drive unit 810 and the third group lens holding member 310 that supply a rotational driving force by meshing with the gear unit 502 of the cam cylinder 500 in the optical axis direction. A focus driving unit 820 is provided. The third lens group holding member 310 can be moved in the optical axis direction by the focus driving unit 820, and the focus can be adjusted by changing the position thereof.

  Next, the zoom operation will be described.

  When the camera is activated, the energization of the zoom drive unit 810 is started, the rotation of a zoom motor (not shown) is transmitted by the gear train, and the cam cylinder 500 meshed with the gear train by the gear portion 502 is also rotated around the optical axis. . When the cam cylinder 500 is rotated, the follower pin 501 is engaged with the cam groove 601 of the fixed cylinder 600, so that the cam cylinder 500 is moved in the optical axis direction along the cam groove 601. Further, as the cam cylinder 500 rotates, the first group cam groove 502, the second group cam groove 503, and the aperture shutter cam groove 504 become the first group lens holding member 150, the second group lens holding member 210, and the follower pins 151 and 211 of the aperture shutter member 400. , 401 are respectively moved in the direction of the optical axis while being linearly regulated by the rectilinear cylinder 700 along the cam groove. In this way, the zoom operation is performed by changing the interval in the optical axis direction of each lens group.

  Next, the barrier opening / closing operation will be described.

  As shown in FIGS. 3, 6, and 8, when the barrier blade 120 is in an open state (when the camera is in a photographing state), the barrier driving member 140 and the straight barrel 700 are positioned at a distance in the optical axis direction. Yes. When the state shifts from this state to the retracted state, the first group lens holding member 150 is driven along the cam groove 502 in a direction approaching the image sensor 900, and thus the barrier driving member 140 is accompanied by the first group lens holding member 150. Is also driven, the distance in the optical axis direction from the straight cylinder 700 is shortened, and the engaging portion 141 of the barrier driving member 140 starts to engage with the engaging portion 706 of the straight cylinder 700. Further, since the engaging portions 141 and 706 are provided with inclined surfaces, the barrier driving member 140 is rotated along these inclined surfaces.

  Thus, when the barrier driving member 140 is rotated, the barrier blade 120 is urged in the closing direction by the urging member 130 provided between the barrier blade 120 and the barrier driving member 140. When the transition to the retracted state is completed as shown in FIGS. 2, 7, and 9, the barrier blade 120 is rotated until it fully covers the photographing opening 111 of the cover member 110 and is fully closed. In this retracted state, as shown in FIG. 4, the straight cylinder 700 is inserted to a height overlapping with the barrier blade 120 in the optical axis direction (the storage space in the fully opened state of the barrier blade 120 is inserted). Since the space in the lens barrel can be used efficiently, a reduction in thickness can be achieved.

  On the contrary, when shifting from the retracted state to the photographing state, the distance between the barrier driving member 140 and the rectilinear cylinder 700 in the optical axis direction increases, and the barrier driving member 140 moves straight while rotating by the urging force of the urging member 130. The engagement with the cylinder 700 is released. When the barrier driving member 140 rotates, the contact portion 142 pushes the barrier blade 120 until the photographing opening 111 of the cover member 110 is sufficiently opened, and the barrier driving member 140 is fully opened.

  Next, harmful rays entering from the outside of the lens barrel will be described with reference to FIGS.

  First, the rectilinear cylinder 700 is provided with three rectilinear grooves 701, 702, and 703 that equally regulate the first group lens holding member 150, the second group lens holding member 210, and the aperture shutter member 400 in the optical axis direction at 120 ° equally. Yes. In addition, three bayonet portions 704 for holding the cam barrel 500 so as to be relatively rotatable about the optical axis are also provided at 120 ° equally. Since the rectilinear grooves 701, 702, and 703 cannot be divided in the optical axis direction, the bayonet portion 704 that must be protruded in the outer peripheral direction toward the cam cylinder 500 is a light beam. They cannot be arranged in overlapping phases in a plane orthogonal to the axis, and are arranged in a phase between three rectilinear grooves 701, 702, 703 that are equally divided by 120 °. Further, in order to escape the bayonet portion 704 in the retracted state, the first group lens holding member 150 is provided with a notch portion 152.

  Furthermore, the rectilinear cylinder 700 has an engaging portion 706 that engages and rotates with the engaging portion 141 of the barrier driving member 140. The engaging portion 706 also has rectilinear grooves 701, 702, 703, an optical axis, and the like. Since it cannot be arranged in an overlapping phase in an orthogonal plane, it is arranged in a phase between three rectilinear grooves 701, 702, 703 arranged equally at 120 °.

  At this time, the notch portion 152 of the first group lens holding member 150 and the engaging portion 706 of the rectilinear cylinder 700 are positioned in an overlapping phase in a plane orthogonal to the optical axis.

  FIG. 5 is an enlarged cross-sectional view at this overlapping phase. In FIG. 5, harmful rays from the outside of the lens barrel indicated by the arrows enter from the gap between the first group lens holding member 150 and the cam barrel 500, and are reflected on the inner wall of the cam barrel 500, the first group lens cam groove 502, and the like. The optical path is changed into the lens barrel and reaches the image sensor 900. As described above, since the first group lens holding member 150 is provided with the notch 152, it is easy to allow harmful rays to enter from the outside of the lens barrel in the phase of FIG. When the engaging portion 706 of 700 is cut away, the structure is easy to reach the image sensor 900. However, in this embodiment, since the wall portion 705 (shaded portion in FIG. 5) is provided adjacent to the engaging portion 706 in the straight tube 700 on the above-described harmful ray intrusion path, It can be blocked on the path and reaching the image sensor 900.

  Further, in FIG. 5, since the wall portion 705 overlaps the first group lens holding member 150 in the optical axis direction, deformation of the first group lens holding member 150 due to an external force can be suppressed. The possibility that the 150 follower pins 151 dislodge from the first group cam groove 502 of the cam barrel 500 can be reduced.

  Further, since the wall portion 705 approaches the engaging portion 141 of the barrier driving member 140 at the time of transition from the photographing state to the retracted state, a taper shape is provided at the tip portion to prevent catching.

  As described above, it is possible to provide a lens barrel that is not easily penetrated by harmful rays while being thin.

  In addition, this invention is not limited to what was illustrated to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.

100 1st group lens 110 Cover member 120 Barrier blade 130 Energizing member 140 Barrier driving member 150 1st group lens holding member 200 2nd group lens 210 2nd group lens holding member 300 3rd group lens 310 3rd group lens holding member 400 Aperture shutter member 500 Cam Cylinder 600 fixed cylinder 700 rectilinear cylinder 800 image sensor holding member 900 image sensor

Claims (3)

  A barrier blade 120 that covers the photographing aperture so that it can be opened and closed, a barrier driving member 140 that opens and closes the barrier blade, a first group lens holding member 150 that holds the barrier driving member 140 rotatably about the optical axis, and the first group In a lens barrel 1000 that includes a linear barrel 700 that restricts the lens holding member 150 from moving straight in the optical axis direction and engages with the barrier driving member 140 to rotate around the optical axis, the barrier blade 120 is closed. A lens barrel characterized in that a wall portion 705 is provided in a position adjacent to the engaging portion 706 that engages with the engaging portion 141 of the barrier driving member 140 in the rectilinear barrel 700.   2. The lens barrel according to claim 1, wherein the straight barrel 700 enters a position overlapping with the barrier blade 120 in the optical axis direction when the barrier blade 120 is closed. 3. The lens barrel according to claim 1, wherein the wall portion 705 overlaps the first group lens holding member 150 in an optical axis direction in a photographing state.