JP2009181102A - Lens barrel and imaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a lens barrel becoming thin and compact when not imaging with a simple mechanism even if it is a lens barrel containing an inflection optical system on which a plurality of lens groups are arranged from a refection member to an object side; and to obtain a thin and compact imaging device by comprising the lens barrel. <P>SOLUTION: In the lens barrel on which the reflection member bending an optical axis is arranged and at least two lens groups are arranged on the object side of the reflection member, in a change from imaging state to non-imaging state, the reflection member and the lens group arranged closest to the object side of the reflection member are rotated respectively in different directions inside a cylindrical member that maintains the lens group to the object side than the lens group arranged closest to the object side of the reflection member when viewed from an incident light axis direction, and the lens group closer to the object side than the lens group arranged closest to the object side of the reflection member is extended and retracted in the lens barrels. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lens barrel that includes a bending optical system in which a reflecting member is disposed in an optical system, and in particular is configured to retract a lens group on the object side from the reflecting member.

  2. Description of the Related Art Conventionally, there has been known an imaging apparatus including a so-called bending optical system in which a reflecting surface is disposed in an optical system and an optical axis is bent. By using a bending optical system in which a small number of lens groups are fixedly arranged on the object side of the reflecting member, there is an apparatus in which the imaging apparatus can be easily thinned without employing a complicated retracting mechanism.

On the other hand, an imaging apparatus is desired to be equipped with a higher zooming optical system, and an apparatus that moves a lens group arranged closer to the object side than the reflecting member in the optical axis direction has been proposed. Such a high-magnification bending optical system has a large number of lens units arranged on the object side of the reflecting member, and needs to be moved in the optical axis direction so as to be separated from the reflecting member during photographing. There are many. For this reason, it is known that the reflecting member and the lens group in the vicinity of the reflecting member are retracted and the lens group disposed on the object side from the reflecting member is moved to the image plane side so that the imaging apparatus is compact when not photographing. (For example, refer to Patent Document 1).
JP 2007-114447 A

  However, the photographing lens unit described in Patent Document 1 does not describe a mechanism such as how to retract and move the reflecting member and retract the lens group disposed on the object side from the reflecting member.

  The present invention obtains a lens barrel that is thin and compact at the time of non-photographing with a simple mechanism, even in a lens barrel that includes a bending optical system in which a plurality of lens groups are arranged on the object side of the reflecting member, An object of the present invention is to obtain a thin and compact imaging device by providing the lens barrel.

  The above object is solved by the following configuration.

  1) In a reflection member that bends the optical axis and a lens barrel in which at least two lens groups are disposed on the object side of the reflection member, the reflection member and the reflection member A cylindrical member that holds the lens group that is closer to the object side than the lens group that is disposed closest to the object side of the reflecting member when viewed from the incident optical axis direction. A lens that is rotated in different directions on the inner side, and at least the lens group that is disposed closest to the object side of the reflecting member and the lens group that is closer to the object side than the lens group are moved in the optical axis direction. The lens barrel.

  2) In a reflection member that bends the optical axis and a lens barrel in which at least two lens groups are disposed on the object side of the reflection member, the reflection member or the reflection member The inner side of the cylindrical member that holds the lens group that is closer to the object side than the lens group that is disposed closest to the object side of the reflecting member when the lens group that is closest to the object side is viewed from the incident optical axis direction. And a lens group arranged at least on the object side of the reflecting member, and the lens group on the object side of the lens group is moved in the optical axis direction.

  3) In a reflection member that bends the optical axis and a lens barrel in which at least two lens groups are disposed on the object side of the reflection member, the reflection member and the reflection member A cylindrical member that holds the lens group that is closer to the object side than the lens group that is disposed closest to the object side of the reflecting member when viewed from the incident optical axis direction. A lens barrel, wherein the lens barrel is rotated in the same direction on the inner side, and at least the lens group disposed on the object side of the reflecting member is moved in the optical axis direction from the lens group disposed closest to the object side.

  4) An imaging apparatus comprising the lens barrel according to any one of 1) to 3).

  According to the present invention, even a bending optical system having a plurality of lens groups on the object side of a reflecting member, it is possible to obtain a lens barrel and an imaging apparatus that are thin and compact when not photographing with a simple mechanism. It becomes.

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

  FIG. 1 is a perspective view illustrating an example of an internal arrangement of main constituent units of a camera 100 that is an example of an imaging apparatus including a lens barrel according to the present embodiment.

  As shown in the figure, the camera 100 has a lens barrel 50 that includes a foldable imaging optical system capable of zooming, and is arranged horizontally as shown in the figure. Reference numeral 11 denotes a first lens arranged on the most object side. A lens barrier (not shown) that opens the first lens 11 and closes the first lens 11 may be provided.

  Reference numeral 52 denotes a flash light emission window. Reference numeral 53 denotes a flash unit including a reflector, a xenon tube, other main capacitors, a circuit board, and the like disposed behind the flash light emission window. A battery 55 supplies power to each part of the camera. The battery 55 and an image recording memory (not shown) can be inserted and removed from a lid (not shown).

  A release button 56 is disposed on the upper surface of the camera. When the first button is pushed, a shooting preparation operation of the camera, that is, a focusing operation and a photometric operation are performed, and a shooting exposure operation is performed by pushing the second button. A main switch 57 is a switch for switching the camera between an operating state and a non-operating state.

  On the back side of the camera, an image display unit 58 configured by an LCD, an organic EL, or the like and displaying an image and other character information is disposed. Although not shown, a zoom button for zooming up and down, a playback button for playing back a captured image, a menu button for displaying various menus on the image display unit 58, and a desired function are selected from the display. An operation member such as a selection button is arranged.

  Although not shown, each part is connected between these main constituent units and a circuit board on which various electronic components are mounted is arranged to drive and control each main constituent unit. Yes. Similarly, although not shown, an external input / output terminal, a strap attaching portion, a tripod seat, and the like are provided.

  FIG. 2 is a diagram showing a lens barrel 50 according to the present embodiment. FIG. 4A is an external perspective view showing an overall outline of the lens barrel 50, and FIG. 4B is a cross-sectional view showing the approximate position of each lens group at the tele end (telephoto end) during photographing. FIG. 6C is a cross-sectional view showing the approximate position of each lens group at the wide end (wide angle end) during photographing. 2B and 2C show cross sections cut along a plane including the optical axis OA before bending and the optical axis OB after bending.

  As shown in the figure, in the lens barrel 50, the first lens group 11 and the second lens group 12 are arranged from the object side. The first lens group frame 11k that holds the first lens group 11 is formed in a cylindrical shape, and a cam pin (not shown) is implanted in the first lens group frame 11k. The cam pin is engaged with an inner cam (not shown) formed on the inner cylinder surface of the cam cylinder 42 via the straight guide groove of the intermediate cylinder 43. That is, the first lens group frame 11k and the first lens group 11 are movable by the rotation of the cam cylinder 42.

  Further, the cam cylinder 42 is rotated by a first drive unit 31 constituted by a motor and a gear unit, and by engagement between a cam pin implanted in the cam cylinder 42 and an inner cam formed on the fixed barrel 41, It can move relative to the fixed cylinder 41.

  A prism P, which is a reflecting member, is disposed on the image plane side of the second lens group 12, and the optical axes of the first lens group 11 and the second lens group 12 are bent by approximately 90 °. A third lens group 13 is disposed on the image plane side of the prism P. In this example, the prism P and the third lens group 13 are integrally held by the third lens group lens frame 13k.

  A fourth lens group 14 is disposed on the image plane side of the third lens group 13. In the present example, in the fourth lens group 14, the four lenses 14a to 14d are integrally held by the fourth lens group lens frame 14k. The fourth lens group lens frame 14k is formed with a sleeve portion through which the guide shaft 16 is fitted and a rotation restricting portion whose rotation is restricted by the guide shaft 17, so that it can move along the guide shafts 16, 17. It has become. Further, the fourth lens group lens frame 14k is moved to a predetermined position by a lead screw (not shown) connected to the stepping motor 32 during zooming (magnification) at the time of photographing.

  A fifth lens group 15 is disposed on the image plane side of the fourth lens group 14. The fifth lens group 15 is held by a fifth lens group lens frame 15k. The fifth lens group lens frame 15k is also provided with a sleeve portion through which the guide shaft 16 is fitted and a rotation restricting portion whose rotation is restricted by the guide shaft 17, so that it can move along the guide shafts 16, 17. It has become. Further, the fifth lens group lens frame 15k is moved to a predetermined position by a lead screw (not shown) connected to the stepping motor 33 during zooming during focusing and during focusing.

  OF is an optical filter in which an infrared light cut filter and an optical low-pass filter are stacked. Further, an image sensor (not shown) is disposed on the image plane side of the optical filter OF.

(First embodiment)
FIG. 3 is a diagram showing a state of the third lens group lens frame 13k holding the prism P and the second lens group lens frame 12k in the photographing state and the non-photographing state of the lens barrel according to the first embodiment. It is. This figure is a front view of the third lens group frame 13k holding the prism P and the second lens group frame 12k extracted from the first lens group side. FIG. 4A shows a shooting state, and FIG. 4B shows a non-shooting state.

  In the photographing state shown in FIG. 6A, the optical axis of the second lens group 12 is at a position substantially coincident with the optical axis OA as shown in the figure when viewed from the first lens group 11 side, and the prism P is in the second state. It is located behind the lens group 12.

  The second lens group lens frame 12k is pivotally fixed so as to be rotatable about an axis 12j. Further, it is biased counterclockwise by a spring (not shown) and is in contact with the stopper 18.

  The third lens group frame 13 holding the prism P and the third lens group 13 is pivotally fixed so as to be rotatable about an axis 13j. Further, it is biased counterclockwise by a spring (not shown) and is in contact with the stopper 19.

  In the non-photographing state shown in FIG. 6B, the second lens group frame 12k is rotated clockwise about the shaft 12j against the urging force of a spring (not shown) as shown. It is designed to move in the direction of the back side of the paper. The third lens group lens frame 13 holding the prism P and the third lens group 13 is rotated clockwise around the shaft 13j against the biasing force of a spring (not shown), and the optical axis OA. It is made to move in the direction of the back side of the paper.

  That is, the lens barrel 50 according to the first embodiment rotates each of the second lens group 12 and the prism P in different directions in the non-shooting state from the shooting state in which the second lens group 12 and the prism P are aligned along the optical axis OA. It's what makes you retreat. As a result, a space corresponding to the thickness of the second lens group lens frame 12k and the movement in the optical axis direction can be formed inside the first lens group lens frame 11k in the direction of the optical axis OA. The first lens group 11 closer to the object side than the second lens group 12 is retracted.

  FIG. 4 is a schematic diagram illustrating an example of a mechanism for rotating and moving the second lens group lens frame 12k. This figure shows the state of the second lens group lens frame 12k during photographing.

  A sleeve portion 12s formed on the second lens group lens frame 12k shown in the drawing is fitted to the shaft 12j so as to be rotatable and slidable. Reference numeral 24 denotes a stopper. The second lens group lens frame 12k is urged in the object side direction by the spring 22 and is urged in the counterclockwise direction of the shaft 12j and is in contact with the stopper 18. The sleeve portion 12s is formed with a narrow pin portion 12p. A plate cam portion 20 is formed in the vicinity of the pin portion 12p as shown in the figure.

  When changing from the shooting state to the non-shooting state, the intermediate cylinder 43 (not shown) moves in the direction of the arrow A shown in the drawing. Due to the movement of the intermediate cylinder in the direction of arrow A, the end face of the intermediate cylinder abuts on the pin portion 12p and further pushes down the pin portion 12p against the biasing force of the spring 22. At this time, the pin portion 12p is rotated clockwise by the inclined cam surface 20a of the plate cam portion 20 as viewed from the object side about the shaft 12j. As a result, the second lens group frame 12k rotates in the direction of the arrow B shown in the drawing while moving to the prism P side.

  When the intermediate cylinder is further moved in the direction of the arrow A in the figure, the pin portion 12p is moved to the prism P side as it is along the surface 20b of the plate cam portion 20.

  The third lens group frame 13k holding the prism P is also rotated about the axis 13j as a center of rotation and moved in the direction toward the back of the paper by using the same rotation and movement mechanism. be able to. However, as the operation timing, in order to avoid interference between the second lens group lens frame 12k and the third lens group lens frame 13k, the second lens group lens frame 13k is first rotated and then the second lens group lens frame 13k is rotated. It is preferable that the lens frame 12k is set to rotate.

  FIG. 5 is a schematic cross-sectional view showing a state in which the first lens group 11 is retracted when the lens barrel according to the first embodiment is not photographed.

  Using the above-described space formed by the rotation of the second lens group frame 12k and the third lens group frame 13k and the movement in the direction parallel to the optical axis, the second nearest the object side of the reflecting member. The first lens group 11 disposed closer to the object side than the lens group 12 is retracted.

  As shown in the drawing, the second lens group lens frame 12k and the third lens group lens frame 13k are still inside the first lens group lens frame 11k even after the rotation, and the second lens group lens frame 12k and the third lens group lens frame 13k. A space for retracting the lens group frame 13k is not necessary. Thereby, the outer shape of the lens barrel can be kept small even in a non-photographing state. The third lens group frame 13 holding the prism P and the third lens group 13 may be rotated only. In this case, a space corresponding to the thickness of the second lens group frame 12k is provided. In this space, the first lens group 11 is retracted.

(Second Embodiment)
FIG. 6 is a diagram illustrating a state of the third lens group lens frame 13k holding the prism P and the second lens group lens frame 12k in the photographing state and the non-photographing state of the lens barrel according to the second embodiment. It is. This figure is a front view of the third lens group frame 13k holding the prism P and the second lens group frame 12k extracted from the first lens group side. FIG. 4A shows a shooting state, and FIG. 4B shows a non-shooting state.

  In the photographing state shown in FIG. 6A, the optical axis of the second lens group 12 is at a position substantially coincident with the optical axis OA as shown in the figure when viewed from the first lens group 11 side, and the prism P is in the second state. It is located behind the lens group 12.

  The second lens group lens frame 12k is pivotally fixed so as to be rotatable about an axis 12j. Further, it is urged clockwise by a spring (not shown) and is in contact with the stopper 18. The third lens group frame 13 holding the prism P and the third lens group 13 is fixed. The second lens group lens frame 12k is rotated about the shaft 12j by a mechanism similar to that shown in FIG.

  In the non-photographing state shown in FIG. 5B, the second lens group frame 12k rotates counterclockwise about the shaft 12j against the urging force of a spring (not shown) and It is designed to move in the reverse direction.

  That is, the lens barrel 50 of the second embodiment is located closest to the object side of the reflecting member in the non-shooting state from the shooting state in which the second lens group 12 and the prism P are aligned along the optical axis OA. The arranged second lens group is rotated inside the first lens group barrel 11k, which is a cylindrical member, and retracted. As a result, a space corresponding to the thickness of the second lens group lens frame 12k can be formed inside the first lens group lens frame 11k in the direction of the optical axis OA, and an object can be formed from the second lens group 12 using this space. The first lens group 11 on the side is retracted.

  FIG. 7 is a schematic cross-sectional view illustrating a state in which the first lens group 11 is retracted when the lens barrel according to the second embodiment is not photographed.

  The first lens group 11 is retracted using the space formed by the rotation of the second lens group frame 12k and the movement in the direction parallel to the optical axis.

  As shown in the drawing, the second lens group frame 12k and the third lens group frame 13k are both inside the first lens group frame 11k, and the second lens group frame 12k and the third lens group mirror. The space for retracting the frame 13k is not necessary. Thereby, the outer shape of the lens barrel can be kept small even in a non-photographing state.

  In the second embodiment, the second lens group lens frame 12k is rotated and moved in the optical axis direction, and the third lens group lens frame 13k holding the prism P is not rotated. However, the second lens group lens frame 12k is configured to be movable only in the optical axis direction without being rotated, and the third lens group lens frame 13k holding the prism P is rotated by the same mechanism to thereby rotate the second lens. The group lens frame 12k and the first lens group may be moved in the optical axis direction to be retracted.

(Third embodiment)
FIG. 8 is a diagram illustrating a state of the third lens group frame 13k holding the prism P and the second lens group frame 12k in the shooting state and the non-shooting state of the lens barrel according to the third embodiment. It is. This figure is a front view of the third lens group frame 13k holding the prism P and the second lens group frame 12k extracted from the first lens group side. FIG. 4A shows a shooting state, and FIG. 4B shows a non-shooting state.

  In the photographing state shown in FIG. 6A, the optical axis of the second lens group 12 is at a position substantially coincident with the optical axis OA as shown in the figure when viewed from the first lens group 11 side, and the prism P is in the second state. It is located behind the lens group 12.

  The second lens group lens frame 12k and the third lens group lens frame 13k holding the prism P and the third lens group are pivotally fixed around an axis 12j. Further, it is biased counterclockwise by a spring (not shown) and is in contact with the stopper 18. The second lens group lens frame 12k and the third lens group lens frame 13k are integrally rotated about the shaft 12j by a mechanism similar to that shown in FIG.

  In the non-photographing state shown in FIG. 5B, the second lens group lens frame 12k and the third lens group lens frame 13k are rotated clockwise about the shaft 12j against the biasing force of a spring (not shown). It is designed to be rotated.

  That is, in the lens barrel 50 of the third embodiment, in the non-photographing state, the second lens group and the prism P arranged closest to the object side of the reflecting member are connected to the first lens group that is a cylindrical member. It is rotated inside the lens frame 11k. Thereby, a space can be created in the vicinity of the optical axis OA inside the first lens group lens barrel 11k, and the first lens group 11 closer to the object side than the second lens group 12 is retracted using this space. It is.

  FIG. 9 is a schematic cross-sectional view showing a state in which the first lens group 11 is retracted when the lens barrel according to the third embodiment is not photographed. This figure shows a cross section cut along line CC shown in FIG.

  The first lens group 11 is retracted using the space formed in the vicinity of the optical axis OA by the rotation of the second lens group lens frame 12k and the third lens group lens frame 13k described above. The second lens group lens frame 12k and the third lens group lens frame 13k may also be moved in the optical axis direction at the rotated position.

  As shown in the drawing, the second lens group frame 12k and the third lens group frame 13k are both inside the first lens group frame 11k, and the second lens group frame 12k and the third lens group mirror. The space for retracting the frame 13k is not necessary. Thereby, the outer shape of the lens barrel can be kept small even in a non-photographing state.

  The configuration of the optical system described in each of the above embodiments is merely an example, and the present invention is applicable to any bending optical system having a plurality of lens groups on the object side of the reflecting member.

It is a perspective view which shows an example of the internal arrangement | positioning of the main structural unit of the camera which is an example of the imaging device provided with the lens barrel which concerns on this Embodiment. It is a figure which shows the lens barrel which concerns on this Embodiment. It is a figure which shows the state of the 3rd lens group lens frame which hold | maintains a prism, and the state of a 2nd lens group lens frame of the imaging | photography state of a lens barrel which concerns on 1st Embodiment, and a non-photographing state. It is a schematic diagram which shows an example of the rotation and movement mechanism of a 2nd lens group lens frame. It is a schematic cross section which shows the state which retracted the 1st lens group at the time of the non-photographing of the lens barrel which concerns on 1st Embodiment. It is a figure which shows the state of the 3rd lens group lens frame which hold | maintains a prism, and the state of a 2nd lens group lens frame of the imaging | photography state and non-imaging state of the lens barrel which concern on 2nd Embodiment. It is a schematic cross section which shows the state which retracted the 1st lens group at the time of the non-photographing of the lens barrel which concerns on 2nd Embodiment. It is a figure which shows the state of the 3rd lens group lens frame which hold | maintains a prism, and the state of a 2nd lens group lens frame of the imaging | photography state of a lens barrel which concerns on 3rd Embodiment, and a non-photographing state. It is a schematic cross section which shows the state which retracted the 1st lens group at the time of the non-photographing of the lens barrel which concerns on 3rd Embodiment.

Explanation of symbols

11 First lens group 11k First lens group lens frame 12 Second lens group 12k Second lens group lens frame 13 Third lens group 13k Third lens group lens frame 14 Fourth lens group 14k Fourth lens group lens frame 15 First 5 lens group 15k 5th lens group lens frame 16, 17 Guide shaft 20 Plate cam portion 22 Spring 41 Fixed cylinder 42 Cam cylinder 43 Intermediate cylinder 50 Lens barrel OF Optical filter P Prism 100 Camera

Claims (4)

In a lens barrel in which at least two lens groups are disposed on the object side of the reflecting member and the reflecting member that bends the optical axis,
When changing from a shooting state to a non-shooting state,
A lens closer to the object side than the lens group arranged closest to the object side of the reflecting member when the reflecting member and the lens group arranged closest to the object side of the reflecting member are viewed from the incident optical axis direction. Rotate in different directions inside the cylindrical member holding the group,
At least a lens group disposed on the object side of the reflecting member and a lens group on the object side of the lens group are moved in the optical axis direction. In a lens barrel in which at least two lens groups are disposed on the object side of the reflecting member and the reflecting member that bends the optical axis,
When changing from a shooting state to a non-shooting state,
The lens group disposed closest to the object side of the reflecting member or the reflecting member when viewed from the incident optical axis direction, the lens group closer to the object side than the lens group disposed closest to the object side of the reflecting member Rotate inside the cylindrical member that holds
At least a lens group disposed on the object side of the reflecting member and a lens group on the object side of the lens group are moved in the optical axis direction. In a lens barrel in which at least two lens groups are disposed on the object side of the reflecting member and the reflecting member that bends the optical axis,
When changing from a shooting state to a non-shooting state,
A lens closer to the object side than the lens group arranged closest to the object side of the reflecting member when the reflecting member and the lens group arranged closest to the object side of the reflecting member are viewed from the incident optical axis direction. Rotate in the same direction inside the cylindrical member holding the group,
A lens barrel, wherein the lens group on the object side is moved in the direction of the optical axis from at least the lens group disposed closest to the object side of the reflecting member. An imaging apparatus comprising the lens barrel according to claim 1.

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