JP2006091386A - Camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera which can prevent foreign materials or the like from sticking to lens groups, arranged on the optical axis on the image plane side of a bending optical system and which is superior in photographic image quality. <P>SOLUTION: The camera is provided with a cover member 19a. When the camera is in collapsed mode, the cover member 19a is disposed between a mirror 6, serving as the bending optical part, and the third group lens L3 on the image plane side so as to cover the third group lens L3. This prevents foreign matters and the like from sticking to the third lens group L3, fourth lens group L4 and fifth lens group L5. To bring the camera into a photographic state, the cover member 19a is moved outside the first optical path by the use of a spring 19b and is thereby used as a flare cutter. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a camera including a lens barrel that employs a bending optical system.

Conventionally, a lens barrel of a camera has a bending optical system that bends an optical axis using a bending optical unit such as a mirror in order to reduce the thickness of the camera in the depth direction.
In addition, a conventional camera equipped with a bending optical system adopts a retractable lens barrel to further reduce the size of the camera, and adopts an optical zoom mechanism for the photographing optical system. Increased added value and differentiated from other models.

  For example, to reduce the size of a camera using a zoom lens, in a zoom lens system composed of a plurality of lens groups, a mirror that bends the optical axis between the lens group that moves during zooming and a lens group. An arranged zoom lens system and lens barrel are disclosed (see Patent Document 1 and Patent Document 2).

In general, a camera equipped with a retractable lens barrel and an optical zoom mechanism includes a mechanism for extending the lens barrel from the camera housing and changing the amount of extension. For this reason, when the lens barrel is extended from the sliding portion or gap of this mechanism, foreign matter such as dust may enter the camera.
In many cameras employing a bending optical system, the direction of the optical axis (image axis side optical axis) bent by a mirror or the like is the vertical direction of the camera. For this reason, there is a possibility that foreign matter or the like entering the inside of the camera adheres to the lens group arranged on the optical axis or an image pickup device such as a CCD, thereby deteriorating the photographing image quality.
JP 2000-187159 A Japanese Patent Laid-Open No. 11-258678

  SUMMARY OF THE INVENTION An object of the present invention is to provide a camera that prevents foreign matters from adhering to a lens group disposed on the optical axis on the image plane side of a bending optical system and has excellent photographing image quality.

The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to the Example of this invention is attached | subjected and demonstrated, it is not limited to this.
According to the first aspect of the present invention, a bent optical unit (6) that bends a first optical path (P1) that is an optical path on the object side into a second optical path (P2) that is an optical path on the image plane side, and the first optical path (P1). At least one moving lens group (L1, L2) that moves in the direction along the first optical axis (O1) that is the optical axis of the optical path (P1), and movement that moves the moving lens group (L1, L2) Lens group moving mechanism (13, 15 etc.) and at least one lens group (L3, L4, L5) arranged on the second optical axis (O2) which is the optical axis of the second optical path (P2) And a cover part (19) disposed between the bent optical part (6) and the lens group (L3) and covering part or all of the lens group (L3).

According to a second aspect of the present invention, in the camera according to the first aspect, the cover (19) includes a cover member (19a, 119a) that covers the lens group (L3) and the cover member (19a, 119a). It is a camera characterized by including a cover member moving mechanism (19b, 119b, 119c, etc.) to be moved.
According to a third aspect of the present invention, in the camera according to the second aspect, the cover member moving mechanism (19b, 119b, 119c, etc.) is configured such that the cover member (19a, 119a) is part of the lens group (L3). Or it is a camera characterized by moving to the position which covers all.
According to a fourth aspect of the present invention, in the camera according to the second or third aspect, the cover member moving mechanism (19b, 119b, 119c, etc.) is configured to move the cover member (19a, 119a) to the movable lens group ( The camera is characterized in that it is moved in accordance with the movement of L1, L2) toward the bending optical part (6).
According to a fifth aspect of the present invention, in the camera according to any one of the second to fourth aspects, the cover member moving mechanism (19b, 119b, 119c, etc.) includes the cover member (19a, 119a). The camera is moved to a position perpendicular to the second optical axis (O2).
According to a sixth aspect of the present invention, in the camera according to any one of the second to fifth aspects, the cover member moving mechanism (19b, 119b, 119c, etc.) includes the cover member (19a, 119a). The camera is characterized by being moved outside the second optical path (P2).
According to a seventh aspect of the present invention, in the camera according to the sixth aspect, the cover member moving mechanism (19b, 119b, 119c, etc.) includes the cover member (19a, 119a) and the movable lens group (L1, L2). This is a camera characterized in that the camera is moved along with the movement toward the object side.
According to an eighth aspect of the present invention, in the camera according to the sixth or seventh aspect, the cover member moving mechanism (19b, 119b, 119c, etc.) moves the cover member (19a, 119a) to the first light. The camera is characterized by being moved to a position perpendicular to the axis (O1).
According to a ninth aspect of the present invention, in the camera according to any one of the sixth to eighth aspects, the cover member (19a, 119a) is formed of a light shielding material, and the first optical path (P1). And is moved to a shielding position between the moving lens group and the bending optical unit (6) to block unnecessary light rays of the photographing optical system including the moving lens group (L1, L2). It is a featured camera.
According to a tenth aspect of the present invention, in the camera according to the ninth aspect, the cover member (19a, 119a) has an arcuate edge (19d), and the arcuate edge is the cover member (19d). 19a, 119a) is formed at the shielding position, and is formed outside the first optical path (P1), and has an arc equal to or less than the curvature of the arc centered on the first optical axis (O1). It is a camera characterized by being.
An eleventh aspect of the present invention is the camera according to any one of the second to tenth aspects, wherein a part of the cover member moving mechanism (19b, 119b, 119c, etc.) is the moving lens group moving mechanism. It is a camera characterized by being a part of (13, 15 etc.).

According to the present invention, the following effects can be obtained.
(1) In the camera of the present invention, the optical path on the object side (first optical path) is bent into the optical path on the image plane side (second optical path) by the bending optical unit, and the optical axis of the second optical path (second optical path) A cover part is provided between the lens group disposed on the optical axis) and the bending optical part to cover part or all of the lens group. Thereby, even if foreign matter such as dust enters from the sliding part, gap, etc. of the moving lens group moving mechanism that moves the moving lens group in the direction along the optical axis (first optical axis) of the first optical path, It is possible to prevent the lens group disposed on the second optical axis from adhering, and to maintain the photographing image quality.

(2) Since the camera of the present invention includes a cover member that covers the lens group and a cover member moving mechanism that moves the cover member, the cover member can be moved when the camera is used. it can.
(3) In the camera of the present invention, the cover member moving mechanism moves the cover member to a position that covers a part or all of the lens group disposed on the second optical axis. When the camera is not used, foreign matter or the like can be prevented from adhering to the lens group.
(4) In the camera of the present invention, the cover member moving mechanism moves the cover member as the moving lens group moves toward the bending optical unit. As a result, when the lens barrel is retracted, the cover member is positioned so as to cover part or all of the lens group disposed on the second optical axis without the user having to operate the cover. The camera operation is not complicated.
(5) In the camera of the present invention, since the cover member moving mechanism moves the cover member to a position perpendicular to the second optical axis, even if the size of the cover member is reduced, the second The lens group disposed on the optical axis can be covered. In addition, it is possible to prevent foreign matter or the like attached to the cover member from dropping off and attaching to the lens group.
(6) In the camera of the present invention, since the cover member moving mechanism moves the cover member to the outside of the second optical path, the cover member can be moved to the outside of the optical path at the time of photographing or the like.
(7) In the camera of the present invention, the cover member moving mechanism moves the cover member with the movement of the moving lens group toward the object side, so that the user does not have to operate the cover portion during shooting. The cover member is moved outside the second optical path, and the camera operation is not complicated.
(8) In the camera of the present invention, since the cover member moving mechanism moves the cover member to a position perpendicular to the first optical axis, the structure such as the positioning of the cover member is simplified. Therefore, the design process, manufacturing process, inspection, and the like are not complicated.
(9) In the camera of the present invention, the cover member is formed of a light shielding material and is moved to the light shielding position outside the first optical path and between the movable lens group and the bending optical unit, so that no photographing optical system is required. Blocking light rays (flares). As a result, the cover member functions as a flare cutter while maintaining the above-described effects, and the shooting image quality of the camera can be improved.
(10) The camera of the present invention is formed in an arc shape that is formed outside the first optical path and has a curvature equal to or less than an arc centered on the first optical axis in a state where the cover member is in the shielding position. Has an edge. Thereby, since the cover member can block | interrupt a flare efficiently, the function as a flare cutter of a cover member can be improved more.
(11) In the camera of the present invention, since a part of the cover member moving mechanism is a part of the moving lens group moving mechanism, even if the cover is provided, a large accommodation space is not required, and the lens barrel There is no complication of the structure.

  The present invention provides a collapsible lens that prevents foreign matter from adhering to a lens group disposed on the optical axis on the image plane side of a bending optical system, and has a superior photographic image quality, and a camera equipped with an optical zoom mechanism. For the purpose of providing, a cover member is provided, and when the camera is in a retracted state, a third group lens is provided between a mirror that is a bending optical unit and a third group lens provided on the image plane side. The cover member is disposed so as to cover the third lens group, the fourth lens group, and the fifth lens group to prevent foreign matters and the like from adhering to the camera, and when the camera is brought into a photographing state, the cover member is placed on the first optical path. It was realized by moving it using a spring on the outside and using it as a flare cutter.

Hereinafter, the present invention will be described in more detail with reference to the drawings and the like.
1 and 2 are diagrams showing Embodiment 1 of a camera according to the present invention. FIG. 1 is a diagram showing a state when the lens barrel is retracted (when an objective lens or the like is housed in a camera housing), and FIG. It is a figure which shows the state at the time of imaging | photography (when an objective lens etc. are drawn out to the object side).
FIG. 1A is a view showing a vertical section of the camera when retracted, and FIG. 1B is a view schematically showing an internal structure when the camera is viewed from the front.
2A is a diagram showing a vertical cross section of the camera at the time of photographing, FIG. 2B is a diagram showing a cross section taken along the line B-B of FIG. 2A, and FIG. It is CC section arrow line view of 2 (a).
In the following description, up and down, front and back, etc. will be described with reference to the normal position shooting of the camera. When shooting in the normal position, it means the state when the optical axis of the objective lens is horizontally oriented and a landscape image is taken, and the objective lens side of the camera body is the front and the opposite side is The back side.
In the camera of Example 1, as shown in FIG. 1A, a lens barrel having a five-group configuration including a bending optical system is accommodated in a housing 11.
The lens barrel includes a first fixed cylinder 12, a cam cylinder 13, a rectilinear cylinder 15, a second fixed cylinder 14 disposed in a direction orthogonal to the first fixed cylinder 12, guide shafts 16 and 17, A cover unit 19 and the like which will be described later are provided.

The mirror 6 is a bending optical unit, and bends the object-side optical path P1 (first optical path) of the photographing optical system by 90 ° to the image plane-side optical path P2 (second optical path). In the camera of this embodiment, the direction of the optical axis of the optical path P1 on the object side (hereinafter referred to as “object side optical axis O1”) is the front-rear direction of the camera, and the optical axis of the optical path P2 on the image plane side (hereinafter referred to as “image plane side”). The mirror 6 is arranged so that the direction of the optical axis O2 ") is the vertical direction of the camera.
The first fixed cylinder 12 has a first group lens L1 (objective lens group) and a second group lens L2 arranged on the object side optical axis O1 in that order from the object side. The second fixed cylinder 14 has a third lens group L3, a fourth lens group L4, and a fifth lens group L5 arranged in that order on the image plane side optical axis O2.

The first group lens L1 and the second group lens L2 are moving lens groups that move in a direction along the object-side optical axis O1. The first group lens L1 and the second group lens L2 are held by the first lens frame 1 and the second lens frame 2, respectively. These lens frames are cam-coupled to the cam barrel 13 and are also prevented from rotating about the object-side optical axis O1 by a rectilinear barrel 15 disposed inside the cam barrel 13. For this reason, when the cam cylinder 13 rotates around the object optical axis O1, the first group lens L1 and the second group lens L2 move in a direction along the object optical axis O1. Thereby, the retractable camera extends the first group lens L1, the second group lens L2, etc., and the camera equipped with the optical zoom mechanism changes the focal length of the photographing optical system.
The cam cylinder 13 is disposed inside the first fixed cylinder 12, and is rotated about the object-side optical axis O1 via a gear train 21a by a zoom motor 21 as a drive unit. Thereby, the cam cylinder 13 moves in the direction along the object-side optical axis O1 together with the rectilinear cylinder 15 accommodated therein. The cam cylinder 13 and the rectilinear cylinder 15 are moving cylinders that move in a direction along the object-side optical axis O1.

  As described above, the first fixed barrel 12, the cam barrel 13, the rectilinear barrel 15, the first lens frame 1, the second lens frame 2, and the like connect the first group lens L1 and the second group lens L2 to the object side optical axis O1. It is the moving mechanism which moves to the direction along.

The third group lens L3, the fourth group lens L4, and the fifth group lens L5 are moving lens groups that move in a direction along the image plane side optical axis O2. The third group lens L3, the fourth group lens L4, and the fifth group lens L5 are respectively held by the third lens frame 3, the fourth lens frame 4, and the fifth lens frame 5, and these lens frames are second fixed. The cylinder 14 is supported so as to be movable.
As shown in FIG. 2B, the fourth lens frame 4 has a through hole 4a in the range behind the camera and two ribs 4b and 4c in the range in front of the camera in parallel with the image plane side optical axis O2. Is provided. The fourth lens frame 4 is arranged such that a guide shaft 16 to be described later is inserted into the through hole 4a, and a guide shaft 17 to be described later is sandwiched between the two ribs 4b and 4c. 17 is supported. The fourth lens frame 4 is positioned and stopped on a plane perpendicular to the image plane side optical axis O2 by the guide shafts 16 and 17. Similarly, the third lens frame 3 and the fifth lens frame 5 are supported by guide shafts 16 and 17, and are positioned on a plane perpendicular to the image plane side optical axis O2 and are prevented from rotating.

The guide shafts 16 and 17 are guide portions that guide the third group lens L3, the fourth group lens L4, and the fifth group lens L5 in the direction along the image plane side optical axis O2.
The guide shaft 16 is disposed on the rear side of the camera with respect to the mirror 6 and in parallel with the image plane side optical axis O2, and is fixed inside the second fixed cylinder 14.
The guide shaft 17 is provided in front of the camera inside the second fixed cylinder 14 and in parallel with the image plane side optical axis O2. The guide shaft 17 is provided outside the cam tube 13 below the camera in order to ensure the movement range of the cam tube 13.

The third lens frame 3, the fourth lens frame 4, and the fifth lens frame 5 are moved in directions along the image plane side optical axis O2 by stepping motors 23, 24, and 25, which are driving units.
In the second fixed cylinder 14, an LPF (low-pass filter) 7 and a CCD (charge coupled device) 8 are fixed in this order on the image plane side of the fifth group lens L5.

  The cover portion 19 is a member that prevents foreign matter and the like from adhering to the moving lens group arranged on the image plane side optical axis when the lens barrel is retracted, and is used as a flare cutter that blocks unnecessary light incident on the imaging optical system during imaging. It is done. The cover part 19 includes a moving mechanism including a cover member 19a and a spring 19b.

The cover member 19a is formed of a light-shielding resin (light-shielding material) and has a plate shape. The planar shape is a substantially rectangular shape having an arc on one side (edge portion 19d) as described later. In the retracted state, the cover member 19a has a function of preventing foreign matters and the like from adhering to the lens group disposed on the image plane side. As shown in FIG. 1A, in the retracted state, the cover member 19a covers the image plane side optical axis O2 so as to cover a part of the third group lens L3 between the mirror 6 and the third group lens L3. It is arranged perpendicular to. The cover member 19a is provided with a rotation shaft 19c in the left-right direction of the camera in a range in front of the camera, and is supported by the second fixed cylinder 14 so as to be rotatable about the rotation shaft 19c. The cover member 19 a is given a counterclockwise moment about a rotation shaft 19 c on a spring 19 b described later, and is prevented from rotating by a positioning portion 15 b provided on the rectilinear cylinder 15.
At the time of shooting, the cover member 19a functions as a flare cutter that blocks the flare of the shooting optical system, and is positioned outside the object-side optical path P1 between the second group lens L2 and the mirror (hereinafter referred to as “blocking position”). It is arranged perpendicular to the side optical axis O1. The shape of the edge 19d on the object side optical axis O1 side of the cover member 19a is formed outside the optical path P1 on the object side when viewed from the rear of the camera (direction along the object side optical axis O1). It has a circular arc shape centered on O1 (see FIG. 2C). The cover member 19a is prevented from rotating by a positioning portion 14a provided in the second fixed cylinder 14 at the time of photographing.

  The spring 19b is a torsion coil spring that rotates the cover member 19a around the rotation shaft 19c. As shown in FIG. 2 (a), the spring 19b has the center of the coil as the center of the rotation shaft 19c, one arm on the inner wall of the second fixed cylinder 14, and the other arm on the cover member 19b. It is arranged to press.

  When the camera is moved from the photographing state to the retracted state by the mechanism described above, the cover member 19a moves with the third group lens L3 as the first group lens L1 and the second group lens L2 move to the mirror 6 side. Moved to a position covering a part of Conversely, when the retracted state is changed to the photographing state, the first group lens L1 and the second group lens L2 are moved to the shielding position as the camera moves forward (object side).

  The spring 19b is a cover member moving mechanism that rotates the cover member 19a around the rotation shaft 19c. Further, the rectilinear cylinder 15, the cam cylinder 13 and the like are part of a moving mechanism (lens group moving mechanism) of the first group lens L1 and the second group lens L2, and at the same time, a cover member moving mechanism for moving the cover member 19a. It is also used as a part of. For this reason, the cover member 19a can be provided without requiring a large accommodation space.

  The photo interrupters PI1 to PI4 are detection units that detect reset positions of the first group lens L1 to the fifth group lens L5. In the first group lens L1 and the second group lens L2, the reset position is detected when the shielding blade 15a provided in the rectilinear cylinder 15 crosses the photo interrupter PI1. Similarly, in the third lens group L3, the fourth lens group L4, and the fifth lens group L5, the shielding wings of the third lens frame 3, the fourth lens frame 4, and the fifth lens frame 5 are photo interrupters PI2 and PI3, respectively. , PI4, the reset position is detected.

  When the lens barrel of the camera of Example 1 is in the retracted state, the first group lens L1, the second group lens L2, and the like are housed inside the housing 11. The third group lens L3, the fourth group lens L4, and the fourth group lens L5 are moved to the image plane side by the driving force of the stepping motors 23, 24, and 25 (see FIG. 1). When the photographing state is set, the first group lens L1, the second group lens L2, etc. are extended in the front direction of the camera (see FIG. 2).

  When the third group lens L3 is moved prior to the fourth group lens L4 when retracting from the shooting state, the third group lens L3 collides with the fourth group lens L4 because the moving areas overlap. Resulting in. The same applies to the fourth group lens L4 and the fifth group lens L5.

Therefore, the camera of the first embodiment includes a CPU 18 (central processing unit) that is a control unit, and controls the zoom motor 21 and the stepping motors 23, 24, and 25.
FIG. 3 is a block diagram illustrating a control system of each motor of the lens barrel of the camera according to the first embodiment.
As shown in FIG. 3, the input from the power supply SW 18 a and the detection from the photo interrupters PI 1 to PI 4 are processed by the signal processing circuit 18 b and output to the CPU 18. Based on the input from the signal processing circuit 18b, the CPU 18 determines whether or not to drive each motor, and instructs the drive circuit 18c. The drive circuit 18c outputs signals to the zoom motor 21 and the stepping motors 23, 24, and 25 to drive each motor.

Further, the CPU 18 determines as follows, and controls and drives the zoom motor 21 and the stepping motors 23, 24, and 25.
FIG. 4 is a flowchart showing a moving sequence of the moving lens group of the camera according to the present embodiment.
As shown in FIG. 4A, when retracting, first, when a power OFF signal is input (S101), the fifth group of stepping motors 25 closest to the image plane are driven by a command from the CPU 18. (S102), the fifth lens unit L5 is moved to the image plane side. When the signal of the photo interrupter PI4 is detected by the fifth lens frame 5 (S103; yes), the fourth group stepping motor 24 is driven (S104), and the fourth group lens L4 is moved to the image plane side. .

Similarly, when the signal of the photo interrupter PI3 is detected (S105; yes), the third group stepping motor 23 is driven (S106), and the third group lens L3 is moved to the image plane side. When the signal of the photo interrupter PI2 is detected (S107; yes), the zoom motor 21 is driven (S108), and the cam cylinder 13 is moved to the mirror side.
The cam cylinder 13 moves until the shielding blade 15a that moves together in the direction along the object-side optical axis O1 moves until the signal of the photo interrupter PI1 is cut, and when the signal of the photo interrupter PI1 is detected (S109; yes). The first group lens L1, the second group lens L2, and the like are housed in the camera casing and are assumed to be in the retracted state, and the camera is turned off (S110).

Next, when changing from the retracted state to the photographing state, in the lens group moving in the direction along the image plane side optical axis O2, adjacent lens groups collide as in the case of the retracted lens group. End up.
Therefore, in the camera of the first embodiment, the CPU 18 performs the following control.

  As shown in FIG. 4B, when a power ON signal is input (S201), the zoom motor 21 is driven by a command from the CPU 18 (S202), and the cam cylinder 13 is moved to the object side. When the signal of the photo interrupter PI1 is not detected (S203; no), the third group stepping motor 23 is driven (S204), and the third group lens L3 is moved to the object side. When the signal of the photo interrupter PI2 is not detected (S205; no), the fourth group stepping motor 24 is driven (S206), and the fourth group lens L4 is moved to the object side.

  Similarly, when the signal of the photo interrupter PI3 is not detected (S207; no), the stepping motor 25 of the fifth group is driven (S208), the fifth group lens L5 is moved to the object side, and the photo interrupter PI4 If no signal is detected (S209; no), the movement of each lens group is completed, and photographing is possible (S210).

  As described above, the lens barrel of the camera according to the first embodiment includes the cover portion 19, and when the lens barrel is retracted, a part of the cover member 19 a is interposed between the mirror 6 and the third group lens L 3. It arrange | positions so that L3 may be covered. For this reason, even if foreign matter or the like enters the inside of the lens barrel from the sliding portion of the cam cylinder 13 and the straight advance cylinder 15 which are moving mechanisms of the first group lens L1 and the second group lens L2, these are Since it is possible to prevent the third lens group L3, the fourth lens group L4, the fifth lens group L5, and the CCD 8 from adhering, it is possible to maintain the photographing image quality.

  The cover member 19a is formed of a light-blocking resin, and at the time of shooting, outside the object-side optical path P1, at a shielding position between the second group lens L2 and the mirror, with respect to the object-side optical axis O1. Arranged vertically. The shape of the edge 19d on the object side optical axis O1 side of the cover member 19a is an arc shape centered on the object side optical axis O1 when viewed from the rear of the camera. For this reason, the cover member 19a functions as a flare cutter and can improve the photographing image quality of the camera. In particular, in the camera according to the first embodiment, the cover member 19a is disposed at the bent portion of the lens barrel that is easily affected by flare, so that unnecessary light incident on the second fixed cylinder 14 can be efficiently blocked. This can increase the effect of the cover member 19a as a flare cutter.

  Furthermore, since the camera of Embodiment 1 also uses a part of the moving mechanism of the moving lens group of the image plane side optical axis O1 as a part of the cover member moving mechanism, the cover unit 19 has a large accommodation space. The effects described above can be realized without the necessity and without complicating the structure of the lens barrel.

Next, a second embodiment of the camera to which the present invention is applied will be described.
In the camera of the first embodiment described above, the cover member moving mechanism of the cover portion 19 is a mechanism using the spring 19b, but the camera of the second embodiment is changed to a mechanism using a gear train.
In the following description, parts that perform the same functions as those in the first embodiment are denoted by the same reference numerals, and redundant descriptions are omitted as appropriate.
FIG. 5 is a diagram illustrating a vertical cross section of the camera according to the second embodiment. FIG. 5A shows a state when the lens barrel is retracted, and FIG.

The camera cover 119 according to the second embodiment includes a cover member 119a, gears 119b and 119c, and the like.
The cover member 119a is supported by the second fixed cylinder 14 so as to be movable in a direction along the object side optical axis O1. As shown in FIG. 5A, when the lens barrel is retracted, the cover member 119a covers the third lens group L3 between the mirror 6 and the third lens group L3 so that the image surface side optical axis is covered. Arranged perpendicular to O2. The cover member 119 is provided with a spur gear portion 119d on the upper surface of the camera.
The gears 119b and 119c are accommodated in the housing 11 so that the rotation axis thereof is in the left-right direction of the camera. Further, the cam cylinder 13 is provided with a spur gear portion 13a in the front-rear direction of the camera on the outer surface in the lower direction of the camera, and the gear 119c, the gear 119b, and the spur gear portion 119d are in mesh with each other. .

With the above mechanism, when changing from the retracted state to the photographing state, the first group lens L1 and the like move in the direction along the object-side optical axis O1 in the camera front direction, and the cover member 119a It moves outside the optical path P2 on the image plane side. Conversely, when the lens barrel is retracted, it moves so as to cover the third lens group L3 behind the camera.
The gears 119b and 119c are cover member moving mechanisms that move the cover member 119a in the direction along the object-side optical axis O. The cam cylinder 13 and the like are a part of a moving mechanism (moving lens group moving mechanism) of the first group lens L1 and the second group lens L2, and at the same time a part of a cover member moving mechanism that moves the cover member 119a. It is.

  The cover member moving mechanism of the camera of Example 2 is formed by gears 119b, 119c and the like, and the rotational force of the cam cylinder 13 is transmitted to the cover member 119a by these gear trains. Therefore, the cover member moving mechanism can be driven stably, and the cover member 119a can be moved smoothly. Further, since the cover member 119a is not loaded with a spring or the like, the cover member 119a can be prevented from being deformed and the reliability of the cover portion can be improved.

  Further, in the camera of Example 2, the wall portion on the outer periphery of the lens frame 3 is extended to the mirror side, and the extension portion 3a (indicated by a two-dot chain line in FIG. 5) is within a range that does not block the optical path P2 on the image plane side. ) Can cover the entire object-side lens surface of the third lens unit L3. Thereby, it is possible to further improve the effect of preventing adhesion of a foreign substance or the like to the lens group disposed on the image plane side, and to maintain the image quality of the camera.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
(1) In the camera according to the first embodiment, the shape of the edge 19d on the object side optical axis O1 side of the cover member 19a is formed outside the optical path P1 on the object side when viewed from the rear of the camera, and the object side optical axis O1. Although the example which has the shape of the circular arc centering on is shown, it is not limited to this. Since it is only necessary to block the flare, for example, an arc formed outside the optical path P1 on the object side and having a curvature equal to or less than the curvature of the arc described above may be used. Alternatively, a linear edge formed outside the optical path P1 on the object side may be used.

(2) In each embodiment, an example in which the lens group disposed on the image plane side optical axis O2 is a moving lens group is shown, but the present invention is not limited to this. For example, a lens group fixed to the second fixed cylinder 14 may be used.

It is a figure which shows the state at the time of collapsing of the camera by Example 1. FIG. It is a figure which shows the state at the time of imaging | photography with the camera by Example 1. FIG. FIG. 3 is a block diagram illustrating a control system of each motor of the camera according to the first embodiment. 6 is a flowchart illustrating a camera movement sequence according to the first embodiment. 6 is a longitudinal sectional view of a camera according to Embodiment 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st lens frame 2 2nd lens frame 3 3rd lens frame 3a Extension part 4 4th lens frame 4a Through-hole 4b, 4c Rib 5 5th lens frame 6 Mirror 7 LPF (low pass filter)
8 CCD (Charge Coupled Device)
DESCRIPTION OF SYMBOLS 11 Housing | casing 12 1st fixed cylinder 13 Cam cylinder 13a Spur gear part 14 2nd fixed cylinder 14a Positioning part 15 Straight advance cylinder 15a Shielding blade 15b Positioning part 16, 17 Guide shaft 16a Tip part 18 CPU
18a Power SW
18b Signal processing circuit 18c Drive circuit 19 Cover portion 19a Cover member 19b Spring 19c Rotating shaft 19d Edge portion 21 Zoom motor 21a Gear train 23, 24, 25 Stepping motor 119 Cover portion 119a Cover member 119b, 119c Gear 119d Spur gear portion L1 1st group lens L2 2nd group lens L3 3rd group lens L4 4th group lens L5 5th group lens PI1 to PI4 Photo interrupter O1 Object side optical axis O2 Image side optical axis P1 Object side optical path P2 Image side optical path

Claims (11)

A bending optical unit that bends a first optical path that is an optical path on the object side into a second optical path that is an optical path on the image plane side;
At least one moving lens group that moves in a direction along a first optical axis that is an optical axis of the first optical path;
A moving lens group moving mechanism for moving the moving lens group;
At least one lens group disposed on a second optical axis that is an optical axis of the second optical path;
A cover part disposed between the bending optical part and the lens group, and covering a part or all of the lens group;
With a camera. The camera of claim 1,
The cover part is
A cover member that covers part or all of the lens group;
A cover member moving mechanism for moving the cover member;
Camera characterized by. The camera according to claim 2,
The cover member moving mechanism is configured to move the cover member to a position where a part or all of the lens group is covered;
Camera characterized by. The camera according to claim 2 or claim 3,
The cover member moving mechanism moves the cover member with the movement of the moving lens group toward the bending optical unit;
Camera characterized by. The camera according to any one of claims 2 to 4,
The cover member moving mechanism moves the cover member so as to be perpendicular to the second optical axis;
Camera characterized by. The camera according to any one of claims 2 to 5,
The cover member moving mechanism moves the cover member to the outside of the second optical path;
Camera characterized by. The camera according to claim 6, wherein
The cover member moving mechanism moves the cover member as the moving lens group moves toward the object side;
Camera characterized by. The camera according to claim 6 or 7,
The cover member moving mechanism moves the cover member so as to be perpendicular to the first optical axis;
Camera characterized by. The camera according to any one of claims 6 to 8,
The cover member is formed of a light shielding material, and is moved to a shielding position between the moving lens group and the bending optical unit outside the first optical path, and includes a moving lens group. Blocking unwanted rays,
Camera characterized by. The camera according to claim 9, wherein
The cover member has an arcuate edge,
The arc-shaped edge is formed outside the first optical path in a state where the cover member is in the shielding position, and is equal to or less than a curvature of an arc centered on the first optical axis. Be an arc,
Camera characterized by. The camera according to any one of claims 2 to 10,
A part of the cover member moving mechanism is a part of the moving lens group moving mechanism;
Camera characterized by.

Images