JP2006243119A - Lens barrel and camera with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a camera capable of being collapsed into a more thinner state when being collapsed and photographing a satisfactory image without causing deterioration of a photograph image due to undesired light rays which enter the lens barrel in an extended state, that is, in a photographing state. <P>SOLUTION: The lens barrel holds an imaging optical system, which includes a plurality of lens groups, and extends and collapse. The lens barrel has a lens barrel member in which an aperture is made at a position different from the part through which a subject luminous flux by an imaging optical system is passed. The lens barrel has an opening/closing member that opens/closes the aperture. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a retractable lens barrel, and more particularly to a lens barrel suitable for retracting a thin lens group having a large number of components.

  Conventionally, a camera is a so-called collapsible type in which the distance between lens groups, which are optical elements constituting an imaging optical system, is reduced and stored thinly in order to make the camera more convenient when not used for shooting. Cameras that use this lens barrel have become common.

  In this retractable lens barrel, a drive motor that drives the focusing lens is placed in the lens barrel, and a cutout is formed in the lens group frame to avoid interference between the lens group frame that is degenerate and the drive motor. In addition, a structure is disclosed in which a drive motor is configured to be thin so as not to interfere with a lens group frame that is retracted when retracted (see, for example, Patent Document 1).

  Furthermore, in recent years, when retracted, not only the interval of the optical elements constituting the photographing optical system is reduced in the optical axis direction, but also some optical elements are retracted to positions different from the optical axes of other optical elements, Cameras using lens barrels that are thinly retracted are also commercially available.

This optical element is retracted to a position different from the optical axis of the other optical element, and is a lens barrel that is intended to be retracted thinly. There has been disclosed a lens group that is retracted to the side of the front group lens and another lens group is retracted to the side of the solid-state imaging device to be retracted thinly (see, for example, Patent Document 2).
JP 2003-287670 A JP 2004-317943 A

  When the lens barrel described in Patent Document 1 is photographed, for example, in the tele state shown in FIG. 3 of the document, unnecessary light other than the photographing light flux that has passed through the front lens group is formed in the second zoom lens cylinder. There is a problem in that it enters the focusing lens side from the opening into which the drive motor is inserted and reaches the imaging element to cause a ghost in the photographed image or a decrease in contrast of the photographed image. This problem cannot be solved by covering the side surface of the motor with a cover member.

  Further, in the lens barrel described in Patent Document 2, for example, as shown in FIG. 14 of the same document, when the lens barrel is retracted, the lens group disposed behind the front lens group is retracted to the side of the front lens group. It is configured. For this reason, the rear group guide frame, which is a lens barrel member assembled with a shutter unit that controls the amount of light of the subject light, has an opening so as not to interfere with the lens group and the rotating shaft that retract to the side of the front group lens when retracted. Is formed. Although this opening is effective for thinning the lens barrel when retracted, for example, the state shown in FIG. 9 of the same document, that is, when the lens barrel is photographed, particularly when each lens group is in the wide position. In this case, unnecessary light other than the photographic luminous flux that has passed through the front lens group enters the focusing lens side through this opening and reaches the image sensor, causing a ghost in the photographed image or reducing the contrast of the photographed image. There is a problem to be generated.

  In view of the above problems, the present invention provides a lens mirror that can be retracted thinner when retracted, and that can capture a good image without deterioration of the captured image due to unnecessary light that has entered the lens barrel in the extended state during shooting. It is an object of the present invention to provide a camera that can obtain a barrel and is provided with this lens barrel so that it is thin when carried and can capture a good image without deterioration of a photographed image due to unnecessary light during photographing.

  The above object is solved by the following configuration.

  1) In an imaging optical system composed of a plurality of lens groups and a lens barrel that holds the imaging optical system and performs extension and retraction, the lens barrel is located at a position different from a subject light beam passage portion by the imaging optical system. A lens barrel member having an opening and an opening / closing member that opens and closes the opening. When the lens barrel is retracted, the opening / closing member opens the opening, and the lens barrel takes an image. The lens barrel, wherein the opening and closing member closes the opening when in the time extension position.

  2) The lens barrel member in which the opening is formed at a position different from the subject light beam passage portion is a lens barrel member provided with a diaphragm and / or a shutter, and the opening / closing member is the diaphragm and / or the lens barrel member. 1) Lens barrel arranged on a different surface from the shutter.

  3) The lens barrel of 1) or 2), in which the opening is inserted with a motor disposed in the lens barrel when retracted.

  4) The lens barrel is configured to retract a predetermined lens group of the imaging optical system to a position different from an optical axis of another lens group when retracted, and the retracted predetermined lens group includes the The lens barrel of 1) or 2) inserted into the opening.

  5) The lens barrel according to 4), wherein when the predetermined lens group is retracted to a position different from the optical axis of the other lens group, the opening / closing member is inserted on the optical axis of the other lens group.

  6) A camera including the lens barrel according to any one of 1) to 5).

  According to the first aspect of the invention, the lens that can be retracted thinner when retracted, and that can capture a good image without deterioration of the captured image due to unnecessary light that has entered the lens barrel in the extended state during imaging. A lens barrel can be obtained.

  According to the second aspect of the invention, the degree of freedom of the mechanism configuration of the opening / closing member is increased, and the opening / closing mechanism having excellent reliability can be obtained.

  According to the invention of the above 3) or 4), it is possible to obtain a lens barrel that can be retracted thinner when retracted.

  According to the above invention 5), the space in the lens barrel can be used effectively, and the lens barrel diameter can be kept small even if the opening / closing member is incorporated.

  According to the above invention 6), it is possible to obtain a camera that is thinner when being carried and can take a good image without deterioration of the taken image due to unnecessary light during photographing.

  Hereinafter, the present invention will be described in detail with reference to embodiments, but the present invention is not limited thereto.

(First embodiment)
FIG. 1 is a cross-sectional view showing a state when the lens barrel 100 according to the first embodiment is retracted.

  In the figure, reference numeral 1 denotes a first lens group, 2 denotes a second lens group, and 3 denotes a third lens group. An imaging optical system is formed by these three lens groups. 4, an optical filter in which an infrared light cut filter and an optical low-pass filter are stacked and an image sensor are arranged. Reference numeral 5 denotes a ground plane that holds an optical filter, an image sensor, and the like.

  A fixed drum 23 is fixed to the main plate 5. A cam cylinder 22 is disposed inside the fixed cylinder 23 and supported so as to be rotatable with respect to the fixed cylinder 23 and also movable in the direction of the optical axis O. A front cylinder 21 is disposed inside the cam cylinder 22.

  A rectilinear guide 31 is disposed inside the front tube 21, and the rectilinear guide 31 is integrally formed with an engagement plate that is engaged with a rectilinear guide groove formed in the fixed barrel 23 and is restricted in rotation. The cam cylinder 22 can move in the optical axis O direction together with the cam cylinder 22 as the cam cylinder 22 moves in the optical axis O direction without rotating.

  The first lens group 1 is held by a first lens group lens frame 11, and the first lens group lens frame 11 is supported by a front tube 21. In the front cylinder 21, the cam pin 21 p is engaged with a cam groove 22 m formed on the inner peripheral surface of the cam cylinder 22, and a part of the front cylinder 21 is engaged with the rectilinear guide 31. By rotating with respect to 23 and moving in the direction of the optical axis O, linear movement in the direction of the optical axis O is performed.

  The second lens group 2 is held by the second lens group moving lens frame 12, and a part of the second lens group moving lens frame 12 engages with the rectilinear guide 31 and is integrally formed or implanted. The cam pin engages with a cam groove (not shown) formed on the inner peripheral surface of the cam cylinder 22 so that the cam cylinder 22 moves straight in the optical axis O direction by rotation and movement in the optical axis O direction. It has become. An aperture shutter unit 16 is fixed to the second lens group moving lens frame 12. The aperture shutter unit 16 may have not only an aperture and a shutter but also an aperture only and a shutter only.

  The third lens group 3 is held by a third lens group frame 13, and this third lens group frame 13 is configured to be movable in the direction of the optical axis O during zooming and focusing by a stepping motor 14, and other lenses. It is designed to be driven independently of the group.

  Reference numeral 15 denotes a photo interrupter, and a part of the third lens group lens frame 13 is inserted between a light projecting portion and a light receiving portion of the photo interrupter 15. The position of the third lens group frame 13, that is, the position of the third lens group 3 is based on the position where a part of the third lens group frame 13 is detached from between the light projecting part and the light receiving part of the photo interrupter 15. The stepping motor 14 is driven and positioned.

  The cam barrel drive gear 41 is rotated forward and backward by a motor (not shown) arranged outside the lens barrel, a reduction gear train, and a columnar gear, and the cam barrel drive gear 41 enables forward and reverse rotation of the cam barrel 22. ing.

  A cam pin 22p is integrally formed or implanted in the cam barrel 22, and is guided in a cam groove 23m formed on the inner peripheral surface of the fixed barrel 23 by the rotation of the cam barrel 22 in the direction of the optical axis O. It is movable. The cam groove on the inner peripheral surface of the cam cylinder 22 is formed of two types of cam grooves 22m that engage with the cam pins 21p formed on the front cylinder 21 and cam grooves (not shown) that engage with the second lens group frame 12. Thus, zooming is performed by moving the first lens group 1 and the second lens group 2 to desired positions, respectively.

  Further, an opening 12k is formed at a position different from the object light beam passage portion of the second lens group moving lens frame 12 by the imaging optical system, and when retracted, a stepping motor 14 is inserted through the opening 12k as shown in the figure. The lens barrel 100 when retracted is made thinner.

  FIG. 2 is a cross-sectional view illustrating the lens barrel 100 according to the first embodiment in a wide state.

  To the wide state of the lens barrel 100 shown in the figure, the cam barrel drive gear is moved from the retracted state shown in FIG. 1 by a motor, a reduction gear train and a columnar gear (not shown) arranged outside the barrel. 41 is driven, and the cam cylinder 22 rotates with respect to the fixed cylinder 23, so that the cam cylinder 22 is fed out by being guided by the cam groove 23 m of the fixed cylinder 23, and further formed on the inner peripheral surface of the cam cylinder 22. The front tube 21 is extended to a predetermined position by the cam groove 22m, the cam pin 21p, and the rectilinear guide 31. The cam groove 22n formed on the inner peripheral surface of the cam tube 22 and the cam pin formed on the second lens group moving lens frame 12 The second lens group moving lens frame 12 is extended to a predetermined position by 12p and the straight guide 31. Further, after the third lens group lens frame 13 is moved to a predetermined wide position by the stepping motor 14, focusing is performed.

  By further driving the cam barrel drive gear 41 from this wide state and rotating the cam barrel 22, the first lens group 1 and the second lens group 2 are formed by cam grooves formed on the inner peripheral surface of the cam barrel 22. Zooming is performed by changing the position of.

  In this extended state at the time of shooting, as shown in the figure, the stepping motor 14 is detached from the opening 12k formed in the second lens group moving lens frame 12, and the opening 12k is moved to the second lens group moving lens frame 12. The closed state is provided by the provided opening / closing member 32.

  FIG. 3 is a schematic diagram illustrating an example of an opening / closing mechanism of the opening / closing member 32 provided in the second lens group moving lens frame 12. In the drawing, the second lens group moving lens frame 12 is viewed from the third lens group lens frame 13 side. 4A shows the state of the opening / closing member 32 when the lens barrel is retracted, and FIG. 4B shows the state of the opening / closing member 32 when the lens barrel is extended. In the figure, the shape of the engaging portion with the cam pin and the straight guide 31 and the tilt stop part of the opening / closing member 32 are omitted.

  As shown in FIGS. 4A and 4B, the opening / closing member 32 includes the second lens group 2 on a surface different from the surface on which the aperture shutter unit 16 of the second lens group moving lens frame 12 is provided. It is rotatably supported by a cylindrical portion indicated by 2d. By disposing the diaphragm shutter unit 16 on a different surface, the degree of freedom in the mechanism configuration of the opening / closing member is increased, and the opening / closing mechanism having excellent reliability can be obtained.

  Further, the opening / closing member 32 is formed with a gear-shaped portion 32 g so that it can be rotated via the idler gear 42 by driving the motor 43. The motor 43 may be either a stepping motor or a DC motor.

  As shown in FIG. 6A, when the lens barrel is retracted, the opening / closing member 32 is rotated in the direction indicated by the arrow, and one of the fan-shaped portions of the opening / closing member 32 comes into contact with the stopper 51 and stops. The opening 12k is in a position where the opening 12k and the hole 32k formed in the fan-shaped portion of the opening / closing member 32 overlap each other.

  FIG. 4B shows a state in which the motor 43 is driven to rotate the opening / closing member 32 in the direction of the arrow, and the other fan-shaped portion of the opening / closing member 32 comes into contact with the stopper 52 and stops. At this time, the hole portion 32k formed in the fan-shaped portion of the opening / closing member 32 and the opening portion 12k formed in the second lens group moving lens frame 12 are shifted from each other, and the opening portion 12k is in the closed state. Become.

  The opening / closing mechanism of the opening / closing member 32 configured as described above operates as follows.

  When the lens barrel 100 is extended from the retracted state shown in FIG. 1 to the wide-angle end shown in FIG. 2, the second lens group moving lens frame 12 is extended and the stepping motor 14 leaves the opening 12k, and then the motor 43 To open and close the open / close member 32 as shown in FIG. This closed state is maintained when the lens barrel 100 is in the extended position during photographing. On the other hand, when the lens barrel 100 is brought into the retracted state from the extended position at the time of photographing, the motor 43 is first driven to bring the opening / closing member 32 into the open state shown in FIG. The operation is performed, and the stepping motor 14 is inserted through the opening 12k in the open state, and the state shown in FIG. 1 is obtained.

  As described above, when the lens barrel 100 shown in FIG. 1 is retracted, the stepping motor 14 can be inserted through the opening 12k as shown in FIG. When the lens barrel 100 is in the extended position at the time of shooting, the opening 12k is closed as shown in FIG. 3B, and unnecessary light that passes through the first lens group 1 and enters from the opening 12k is blocked. This makes it possible to eliminate the occurrence of ghosts and the decrease in contrast of captured images.

  In addition, although the example which opens and closes an opening / closing member using a motor was demonstrated, it is not restricted to this, You may comprise so that an opening / closing member may be opened and closed using an actuator which moves linearly, such as a solenoid, It does not depart from the present invention even if a mechanical interlocking mechanism is constructed with other lens barrel members to open and close the opening and closing members.

(Second Embodiment)
FIG. 4 is a schematic cross-sectional view showing a wide state of the lens barrel 150 according to the second embodiment.

  In the figure, O is the optical axis, 1 is the first lens group, 2 is the second lens group, 3 is the third lens group, 54 is the optical filter, and an infrared light cut filter and an optical low-pass filter are stacked. It is a filter. These constitute an imaging optical system. Reference numeral 55 denotes an image sensor.

  Reference numeral 61 denotes a first lens group lens frame, which holds the first lens group 1 and is held by the front tube 71. Reference numeral 62 denotes a second lens group lens frame, which holds the second lens group 2. The second lens group lens frame 62 is held by the second lens group moving lens frame 66 and rotates to rotate the optical axis. O can be saved from O. Reference numeral 64 denotes an aperture and / or shutter unit, which is held by the second lens group moving lens frame 66. Reference numeral 63 denotes a third lens group frame, which holds the third lens group 3 and is configured to be movable in the direction of the optical axis O by a stepping motor (not shown). The third lens group lens frame 63 can be moved independently, whereby the third lens group 3 can be moved for focusing. A ground plane 65 holds the optical filter 54 and the image sensor 55.

  Next, the operation of the lens barrel 150 will be described.

  In the figure, a fixed cylinder 74 is assembled to the main plate 65. A cam groove 74 c is formed on the inner surface of the fixing cylinder 74. Reference numeral 73 denotes an intermediate cylinder, which is rotated by an intermediate cylinder drive gear 85 via a motor and a reduction gear train (not shown) and a columnar gear 86. With the rotation of the intermediate cylinder 73, the cam pin 73p implanted in the intermediate cylinder 73 is guided by the cam groove 74c formed in the fixed cylinder 74 and moves in the optical axis O direction.

  The guide ring 83 is engaged with a rectilinear guide portion formed on the fixed cylinder 74 and is capable of linearly moving in the direction of the optical axis O. The guide ring 83 holds the intermediate cylinder drive gear 85 and holds the optical axis of the intermediate cylinder 73. Along with the movement in the O direction, it moves straight in the optical axis O direction. The guide ring 83 is formed with a cam groove and a rectilinear guide portion.

  The cam cylinder 72 has a cam pin 72p engaged with the intermediate cylinder 73 and the guide ring 83. The cam cylinder 72 is also rotated by the rotation of the intermediate cylinder 73 with which the cam pin 72p is engaged, and the cam pin 72p is engaged. It is guided by a cam groove formed in the guide ring 83 to move in the optical axis O direction. That is, the cam pin 72 p is engaged with a key groove formed in a direction parallel to the optical axis of the intermediate cylinder 73 and a cam groove formed in the guide ring 83. Cam grooves for guiding the front cylinder 71 and the second lens group moving lens frame 66 are formed on the inner surface of the cam cylinder 72.

  The rectilinear guide 82A is engaged with a rectilinear guide portion formed on the guide ring 83, and is capable of rectilinear movement in the optical axis O direction. As the cam barrel 72 moves in the optical axis O direction, It moves straight in the direction of the optical axis O. The decorative cylinder 82B is also engaged with the rectilinear guide portion formed on the guide ring 83, and can be moved linearly in the direction of the optical axis O. As the cam cylinder 72 moves in the direction of the optical axis O, It moves straight in the direction of the optical axis O.

  The front cylinder 71 has a cam pin 71p that is engaged with one cam groove formed in the cam cylinder 72, and is engaged with a rectilinear guide 82A. The second lens group moving lens frame 66 is formed with a cam pin 66p that engages with the other cam groove formed in the cam barrel 72, and is engaged with the rectilinear guide 82A.

  Thereby, by rotation of the cam cylinder 72, the front cylinder 71 and the second lens group moving lens frame 66 are guided by the cam grooves that engage with each other, and are linearly moved in the direction of the optical axis O and held by the front cylinder 71. Zooming can be performed by changing the interval between the first lens group 1 and the second lens group 2 held by the second lens group moving lens frame 66.

  From this state, the cam barrel driving gear 85 is further driven to rotate the intermediate cylinder 73, so that the positions of the first lens group 1 and the second lens group 2 are formed by cam grooves formed on the inner peripheral surface of the cam barrel 72. Zooming is performed by changing.

  Further, the second lens group moving lens frame 66 has an opening 66k at a position different from the object light beam passage part by the image pickup optical system. As described above, the opening 66k formed in the second lens group moving lens frame 66 is in a closed state shielded by the opening / closing member 67 provided in the second lens group moving lens frame 66.

  The above is the schematic operation of the lens barrel 150 according to the second embodiment.

  FIG. 5 is a schematic cross-sectional view showing a state when the lens barrel 150 according to the second embodiment is retracted.

  To the retracted state of the lens barrel 150 shown in the same figure, after moving the third lens group frame 63 to the main plate 65 side from the wide state shown in FIG. The intermediate cylinder drive gear 85 is rotated in the reverse direction via the columnar gear 86 and the intermediate cylinder 73 is rotated in the reverse direction.

  Due to the reverse rotation of the intermediate cylinder 73, the cam cylinder 72 is reversely rotated, and the front cylinder 71 and the second lens group moving lens frame 66 are guided and approached by the cam grooves engaging with each other. The cam cylinder 72 moves to the main plate 65 side.

  At this time, the second lens group lens frame 62 held by the second lens group moving lens frame 66 is pivotally supported on a rotation shaft, which will be described in detail later, and rotates about this rotation axis. Retreat to a position different from the optical axis of the other lens group. In addition, the open / close member 67 that has closed the opening 66k formed in the second lens group moving lens frame 66 in the extended state at the time of shooting including the wide time is on the optical axis O side as shown in the drawing. The opening 66k is moved to the open state.

  After the second lens group lens frame 62 is retracted from the optical axis O, the second lens group lens frame 62 is further slid and moved relative to the rotation shaft, so that the second lens group lens frame 62 enters and is accommodated in the opened opening 66k.

  The intermediate cylinder 73 and the cam cylinder 72 move to the base plate 65 side, and the third lens group 3, the second lens group moving lens frame 66, the diaphragm and / or shutter unit 64, and the first lens group 1 are limited to a minimum gap. Are brought close to each other to be in the retracted state shown in the figure.

  FIG. 6 is a perspective view showing an example of the retracting and sliding of the second lens group lens frame 62 and the opening / closing mechanism of the opening / closing member 67. This figure is a view of the second lens group lens frame 62 and the second lens group moving lens frame 66 as viewed from the image pickup device side. The lens barrel is extended, and the second lens group 2 is positioned on the optical axis O. Shows that the camera can shoot.

  As shown in the figure, a rotation shaft 91 is implanted in the second lens group moving lens frame 66, and a cylindrical portion 62t formed in the second lens group lens frame 62 is inserted. A torsion coil spring 92 is assembled between the cylindrical portion 62t and the second lens group moving lens frame 66, and a retaining member 93 of the cylindrical portion 62t is assembled to the rotating shaft 91.

  The torsion coil spring 92 urges the cylindrical portion 62t formed in the second lens group lens frame 62 at the coil portion in the direction indicated by the arrow A while the arms of the second lens group lens frame 62 are illustrated at both ends. It is energized in the direction of arrow B. The protrusion 62 s formed on the second lens group lens frame 62 abuts on a stopper pin 66 s formed on the second lens group moving lens frame 66 so that the second lens group lens frame 62, that is, the second lens group 2 is moved. It is located on the optical axis O. Reference numerals 65c and 65d denote cam plates formed on the base plate 65, which are in a state of being separated from the second lens group lens frame 62 in a state where the lens barrel is extended and photography is possible.

  A shaft 94 is formed on the second lens group moving lens frame 66, and an opening / closing member 67 formed integrally with the collar 95 is rotatably supported on the shaft 94. The opening / closing member 67 is biased by a spring 96 in the direction of the arrow C in the figure. For this reason, as shown in the figure, the opening 66k formed in the second lens group moving lens frame 66 at a position different from the optical axis O which is the subject light beam passage portion is shielded by the opening / closing member 67 and is in the closed state.

  When the lens barrel is driven in the retracted direction from this state, the second lens group moving lens frame 66 moves in the direction of the cam plates 65c and 65d formed on the base plate 65, and the inclined portion 65k formed on the cam plate 65c. The pin 62p formed in the cylindrical part 62t contacts, and the cylindrical part 62t is rotated along the inclination of the inclined part 65k. Thereby, the second lens group lens frame 62 is rotated in the direction opposite to the arrow B shown in the figure against the urging force of the torsion coil spring 92 around the rotation shaft 91 and retracted from the optical axis O. It will be located on the opening 66k.

  Similarly, the inclined portion 65m formed on the cam plate 65d and the pin 95p formed on the collar 95 come into contact with each other, and the collar 95 is rotated along the inclination of the inclined portion 65m. As a result, the opening / closing member 67 is rotated about the shaft 94 in the direction opposite to the illustrated arrow C against the biasing force of the spring 96 and is positioned on the optical axis O.

  FIG. 7 is a view schematically showing the rotation of the opening / closing member 67 and the second lens group frame 62. FIG. 5A shows the state of the opening / closing member 67 and the second lens group lens frame 62 during photographing when the lens barrel is extended, and FIG. 5B shows the opening / closing member 67 and the second lens group lens frame. 62 shows a state when the cam plates 65c and 65d are rotated.

  As shown in FIG. 6A, the second lens group 2 held by the second lens group lens frame 62 is positioned on the optical axis O during photographing, and the opening / closing member 67 closes the opening 66k. It is said. Further, as shown in FIG. 5B, during the retracting operation, the opening / closing member 67 rotates from the opening 66k onto the optical axis O to open the opening 66k, and the second lens group lens frame 62 is opened. Is retracted from the optical axis O and positioned on the opening 66k.

  Returning to FIG. 6, the second lens group moving lens frame 66 is further moved in the direction of the image sensor from the above state, so that the linear portion 65 p formed on the cam plate 65 c and the pin 62 p come into contact with each other. The two-lens group lens frame 62 slides in the direction opposite to the arrow A and moves into the opening 66k against the urging force of the torsion coil spring 42 by the pressing of the linear portion 65p. Stored.

  That is, the second lens group lens frame 62 is pivotally supported on a rotation shaft 91 provided on the second lens group moving lens frame 66 that is a lens barrel member that moves to the image plane side when the lens barrel is retracted. While rotating to the center, it slides and moves with respect to the rotation shaft 91, and enters an opening 66 k formed in the second lens group moving lens frame 66.

  In this way, the lens barrel 150 is in the retracted state shown in FIG.

  As described above, when the lens barrel 150 is retracted, the lens barrel 150 can be retracted thinly by penetrating and inserting the second lens group lens frame 62 which is retracted with the opening 66k opened, and the lens barrel 150 is moved out at the time of shooting. In this case, the opening 66k is closed by the opening / closing member 67, and unnecessary light that passes through the first lens group 1 and enters from the opening 66k can be blocked. It becomes possible.

  In addition, the rotation position of the opening / closing member 67 and the second lens group lens frame 62 is alternately moved on the optical axis O and the opening 66k in this way, thereby effectively making space in the lens barrel. The opening / closing member 67 can be built in with the lens barrel diameter kept small.

  In the first and second embodiments described above, the example in which the opening / closing member is formed by a single component has been described. However, the opening / closing member may be configured by a plurality of blade-shaped members. In addition, although the description has been made by taking the 3 group zoom lens as an example, it is needless to say that the present invention can be applied to a 2 group zoom or a lens configuration of 4 groups or more. Further, although the description has been given of the case where the opening is formed in a circular shape, it is needless to say that a U-shaped cutout shape or the like may be used.

  FIG. 8 is an external view showing an example of a camera including the lens barrel according to the above embodiment. FIG. 4A is a perspective view of the front side of the camera, and FIG.

  In FIG. 1A, reference numeral 150 denotes the lens barrel described in the second embodiment, and includes a zoom imaging optical system. Reference numeral 111 denotes a finder window, 112 denotes a release button, 113 denotes a flash light emitting unit, 114 denotes a light control sensor window, 115 denotes a strap attaching unit, and 116 denotes an external input / output terminal (for example, a USB terminal). Reference numeral 117 denotes a slide barrier. When the slide barrier 117 is operated in the closing direction, the lens barrel 150 is retracted. Reference numeral 118 denotes a voice recording microphone.

  The release button 112 performs a shooting preparation operation of the camera, that is, a focusing operation and a photometric operation, by pressing the first step, and a shooting exposure operation is performed by pressing the release button 112 by the second step.

  In FIG. 2B, 120 is a viewfinder eyepiece, 121 is a red and green display lamp, and displays AF and AE information to the photographer by lighting or blinking. A zoom button 122 is a button for zooming up and zooming down. Reference numeral 123 denotes a menu / set button, reference numeral 124 denotes a selection button, which is a four-way switch, and reference numeral 125 denotes an image display unit that displays an image, other character information, and the like. The menu / set button 123 has a function of displaying various menus on the image display unit 125, selecting with the selection button 124, and confirming with the menu / set button 123. A reproduction button 126 is a button for reproducing a photographed image. Reference numeral 127 denotes a display button, which is a button for selecting display or deletion of an image displayed on the image display unit 125 or other character information. Reference numeral 128 denotes an erasing button, which is a button for erasing the photographed and recorded image. 129 is a tripod hole, 130 is a battery / card cover, and 131 is a speaker for voice reproduction. Inside the battery / card cover 130, a battery for supplying power to the camera and a slot for a card for recording a photographed image are provided. A battery and a card-type recording memory for recording an image are inserted. It has become removable.

  In this way, by providing the camera with the lens barrel described above, the camera is thin when being carried, and in the extended state that is during photographing, the photographed image is not deteriorated due to unnecessary light that wraps around the lens barrel. It is possible to obtain a camera that can shoot various images.

  Note that the camera provided with the lens barrel described in the first embodiment has a two-stage lens barrel shown in FIG. 8, and subject light is incident on the center of the lens barrel. The opening to be formed is formed.

It is sectional drawing which shows the state at the time of retraction of the lens barrel which concerns on 1st Embodiment. It is sectional drawing which shows the state at the time of wide of the lens barrel which concerns on 1st Embodiment. It is a schematic diagram which shows the example of the opening / closing mechanism of the opening / closing member with which the 2nd lens group moving lens frame was equipped. It is a schematic sectional drawing which shows the state at the time of wide of the lens barrel which concerns on 2nd Embodiment. It is a schematic sectional drawing which shows the state at the time of retraction of the lens barrel which concerns on 2nd Embodiment. It is a perspective view which shows an example of the retraction | saving and sliding of a 2nd lens group lens frame, and an opening / closing mechanism of an opening / closing member. It is the figure which showed typically rotation of an opening-and-closing member and the 2nd lens group lens frame. It is an external view which shows an example of the camera provided with the lens barrel which concerns on embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st lens group 2 2nd lens group 3 3rd lens group 5 Ground plane (1st Embodiment)
11 First lens group frame (first embodiment)
12 Second lens group moving lens frame (first embodiment)
13 Third lens group frame (first embodiment)
14 Stepping motor (first embodiment)
15 Photointerrupter (first embodiment)
16 Aperture and / or shutter unit (first embodiment)
21 Front tube (first embodiment)
22 Cam cylinder (first embodiment)
23 fixed body (first embodiment)
32 Opening and closing member (first embodiment)
61 First lens group frame (second embodiment)
62 Second lens group frame (second embodiment)
63 Third lens group frame (second embodiment)
64 Aperture and / or shutter unit (second embodiment)
65 Ground plane (second embodiment)
66 Second lens group moving lens frame (second embodiment)
67 Opening and closing member (second embodiment)
71 Front tube (second embodiment)
72 Cam cylinder (second embodiment)
73 Intermediate trunk (second embodiment)
74 Ground plane (second embodiment)

Claims (6)

In an imaging optical system composed of a plurality of lens groups, and a lens barrel that holds the imaging optical system and performs extension and retraction,
The lens barrel includes a barrel member having an opening formed at a position different from a subject light beam passage portion by the imaging optical system, and an opening / closing member that opens and closes the opening, and when the lens barrel is retracted The lens barrel is characterized in that the opening / closing member opens the opening, and the opening / closing member closes the opening when the lens barrel is in the extended position during photographing. The lens barrel member in which the opening is formed at a position different from the subject light beam passing portion is a lens barrel member provided with a diaphragm and / or shutter, and the opening / closing member includes the diaphragm and / or shutter of the lens barrel member. The lens barrel according to claim 1, wherein the lens barrel is disposed on different surfaces. The lens barrel according to claim 1, wherein a motor disposed in the lens barrel is inserted into the opening when retracted. The lens barrel is configured to retract a predetermined lens group of the imaging optical system to a position different from an optical axis of another lens group when retracted, and the retracted predetermined lens group is the opening. The lens barrel according to claim 1, wherein the lens barrel is inserted into the lens barrel. 5. The lens according to claim 4, wherein when the predetermined lens group is retracted to a position different from the optical axis of the other lens group, the opening / closing member is inserted on the optical axis of the other lens group. The lens barrel. A camera comprising the lens barrel according to claim 1.

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