JP2004354879A - Lens barrel and image input device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens barrel which prevents external light and dust etc. from entering into the lens barrel from the circumferential surface direction around the optical axis and is made small-sized and light in weight. <P>SOLUTION: A light shielding sheet 1 which prevents the entrance of an entrance prevention object such as the external light from the rectangular direction to the optical axis via an opening aperture part including a first cam slot 17 and a second cam slot 18 and the dust into the lens barrel LB is adhered and fixed to the position corresponding to the opening aperture part including the first cam slot 17 and the second cam slot 18 on a cam ring 7 by an adhesive applied on the half surface. Further, the position according to the opening aperture part existing in the cam ring 7 on the end part position of the substrate 12 side of the cam ring 7 is shielded by a gear ring 8. Thereby, the entrance of the entrance prevention object from the rectangular direction to the optical axis for the lens barrel LB can be almost completely prevented at a reduced manufacture cost by using a miniaturized and simple constitution. Furthermore, in the state that a camera part is mounted, the photographing operation of high quality picture capable of completely preventing the entrance of the entrance prevention object is permitted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lens barrel and an image input device equipped with the lens barrel.
[0002]
[Prior art]
In a lens barrel of a zoom lens of a camera, a lens is held between a lens holding frame and a fixed frame, which moves in the optical axis direction and performs a zooming operation, or a lens holding frame and another frame. There is a gap between them, and outside light may enter the lens barrel through this gap, which may adversely affect the photographing operation of the camera.
Conventionally, in order to prevent such intrusion of external light, one or two ring-shaped sheets of rubber material are provided between the lens holding frame and the fixed frame, or between the lens holding frame and another The ring-shaped sheet is disposed between the lens holding frame and the inner surface of the ring-shaped sheet, and is joined to the outer peripheral surface of the lens holding frame.
In this case, when two ring-shaped sheets are used, it is possible to prevent light leakage accompanying aging caused by sliding contact wear and elasticity deterioration, which is likely to occur when using one ring-shaped sheet. There is a problem that the force increases and the external force required for moving the lens holder increases.
[0003]
In order to solve this problem, Patent Literature 1 described below discloses a method in which a first ring-shaped sheet and a second ring-shaped sheet having different inner diameters are polymerized and integrated to form a gap between a lens holding frame and a fixed frame. Alternatively, the lens may be arranged between the lens holding frame and another frame so that the width direction is perpendicular to the optical axis direction, and the first ring-shaped sheet and the second ring-shaped sheet face the inner diameter side. Optics that are bent into two sides and joined to the outer peripheral surface of the lens holding frame to reduce the joint area of one ring-shaped sheet with the lens holding frame and reduce the external force required to move the lens holding body. A light-shielding cover for a device is disclosed.
[0004]
[Patent Document 1]
JP 2001-10072 A
According to the light shielding cover for an optical device disclosed in Patent Literature 1, a gap formed between a lens holding frame and a fixed frame or between a lens holding frame and another frame enters a lens barrel. Although it is possible to prevent external light from entering and reduce the external force required for moving the lens holder, it is possible to reduce the external force from the opening existing in the circumferential direction around the optical axis of the lens barrel. Intrusion light cannot be prevented. In this type of lens barrel, the liner groove and cam groove necessary for the movement of the lens holder in the optical axis direction are formed in the circumferential direction around the optical axis of the lens barrel. It is an important issue to prevent external light from entering from the circumferential direction around the optical axis of the lens barrel.
In this case, it is conceivable to form a shielding wall that covers the entire outer periphery of the lens barrel to block external light. However, the whole is increased in size and weight is increased, and portability is impaired and a problem arises in manufacturing cost.
[0006]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention has been made in view of the current situation of preventing intrusion of external light into a conventional lens barrel of this type as described above. An object of the present invention is to provide a small and lightweight lens barrel which can prevent a target to be prevented from entering the inside of a lens mirror from a circumferential direction around the optical axis with a simple configuration.
Further, a second object of the present invention is to easily prevent an object to be prevented from entering the inside of the lens barrel such as external light or foreign matter from entering the inside of the lens mirror from a circumferential direction around the optical axis. An object of the present invention is to provide an image input device such as a camera to which a lens barrel which is prevented by the configuration and which is reduced in size and weight is mounted.
[0007]
[Means for Solving the Problems]
In order to achieve the first object, the invention according to claim 1 is a lens holding device which is fitted to a fixed frame, holds a lens group, is movable in an optical axis direction, and has a cam follower protrudingly arranged. A frame, a liner slot formed in the fixed frame, the cam follower being engaged and arranged to regulate the rotation of the lens holding frame about the optical axis, and the cam follower is provided through the liner slot. A cam ring formed with a cam groove to be engaged with the cam ring, the cam ring being opposed to an outer peripheral surface of the lens holding frame, and a cam ring provided at an end of the lens holding frame on a light exit side of light passing through the lens group; Rotating means for rotating a ring, and the cam follower engaging with the liner groove and the cam groove is moved by the rotation of the cam ring about the optical axis by the rotating means, The lens holding frame is moved toward the optical axis based on the movement. Optical axis direction moving means for moving the object, and shielding means for preventing entry of an intrusion prevention target including external light into the lens barrel from a direction perpendicular to the optical axis. .
[0008]
According to the first aspect of the present invention, when the lens barrel shifts from the collapsed state to the photographing state, the lens follower is fitted to the fixed frame, holds the lens group, is movable in the optical axis direction, and the cam follower is provided so as to protrude. The turning means provided at the end of the lens group of the lens holding frame which is at the exit side of the passing light of the lens group is activated, and the turning means is disposed to face the outer peripheral surface of the lens holding frame and the cam follower is engaged. A cam ring having a cam slot is rotated about the optical axis.
In this state, the rotation of the lens holding frame around the optical axis is regulated by the engagement arrangement of the cam follower with the liner slot formed in the fixed frame, but the engagement is made with the liner slot. Since the tip of the cam follower is also engaged with the cam groove formed in the cam ring, the rotation of the cam ring in a predetermined direction by the rotating means activates the optical axis direction moving means, thereby causing the liner groove to move. The cam follower engaging with the hole and the cam groove moves, and the lens holding frame is moved in the optical axis direction based on the movement, and the lens barrel shifts from the collapsed state to the photographing state.
On the other hand, the shielding means prevents the intrusion prevention object including the external light from entering the inside of the lens barrel from a direction perpendicular to the optical axis, so that the light into the lens barrel that shifts from the collapsed state to the shooting state is prevented. Intrusion of the object to be prevented from entering, such as external light or dust, from a direction perpendicular to the axis is almost completely prevented.
[0009]
Similarly, to achieve the first object, the invention according to claim 2 is characterized in that, in the invention according to claim 1, the shielding means is a shielding sheet formed of a light shielding material. .
[0010]
According to the second aspect of the present invention, the shielding sheet formed of the light shielding material is used as the shielding means, so that the light shielding is further enhanced and the effect of the first aspect of the invention is executed.
[0011]
Similarly, in order to achieve the first object, according to a third aspect of the present invention, in the second aspect of the present invention, the shielding sheet is formed of an adhesive tape and is adhered and disposed on the outer peripheral surface of the cam ring. It is characterized by the following.
[0012]
According to the third aspect of the present invention, the shielding sheet is formed of an adhesive tape, and this adhesive tape is adhered and disposed on the outer peripheral surface of the cam ring. The prevention of the intrusion of the object to be prevented is quickly performed by a simple process, so that the manufacturing cost is reduced and the overall size is reduced.
[0013]
Similarly, in order to achieve the first object, the invention according to claim 4 is the invention according to claim 3, wherein the shielding sheet is provided on the outer peripheral surface of the cam ring with the liner slot of the object to be prevented from entering. And at a corresponding position for preventing intrusion into the lens barrel through an opening including a cam slot.
[0014]
According to the fourth aspect of the present invention, in addition to the function of the third aspect of the present invention, the shielding sheet passes through the opening including the liner slot and the cam slot with respect to the outer peripheral surface of the cam ring. Since the intrusion prevention target is bonded and disposed at a corresponding position for preventing the intrusion target from entering the inside of the lens barrel, the intrusion prevention target can be more reliably prevented from entering the inside of the lens barrel.
[0015]
Similarly, in order to achieve the first object, according to a fifth aspect of the present invention, there is provided the lens mirror according to the first aspect, wherein the shielding means is provided through an opening at an exit side end of the intrusion prevention target. It is a turning means provided at a position for preventing intrusion into the inside of the trunk.
[0016]
According to the fifth aspect of the present invention, the rotation means provided at a position for preventing the intrusion prevention target body from entering the inside of the lens barrel through the opening at the end of the exit side of the light passing through the lens group. As the shielding means, the operation according to the first aspect of the present invention is performed.
[0017]
Similarly, in order to achieve the first object, according to a sixth aspect of the present invention, in the lens barrel according to any one of the second to fourth aspects, the rotation means is configured to emit the object to be prevented from entering. It is provided at a position for preventing entry into the lens barrel through the side end.
[0018]
According to the sixth aspect of the invention, in addition to the effect of the second aspect of the present invention, the opening means at the end of the lens group on the emission side of the light passing therethrough is rotated by the rotating means. By preventing the intrusion prevention target from entering the inside of the lens barrel, the effect of preventing the intrusion prevention target from entering the inside of the lens barrel is further enhanced.
[0019]
In order to achieve the second object, an image input apparatus according to a seventh aspect of the present invention is provided with the lens barrel according to any one of the first to sixth aspects. Things.
[0020]
According to a seventh aspect of the present invention, there is provided an image input apparatus provided with the lens barrel according to any one of the first to sixth aspects. The operation of the present invention is performed, and a high-quality image is input to the image input device.
[0021]
Similarly, to achieve the second object, the invention according to claim 8 is the image input device according to claim 7, wherein the image input device is a camera.
[0022]
According to the eighth aspect of the present invention, the operation of taking a high-quality image by the camera is executed based on the operation of the seventh aspect of the present invention using the camera as an image input device.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will be sequentially described below with reference to FIGS. 1 to 6 based on one embodiment of a lens barrel.
FIG. 1 is a cross-sectional view showing the configuration of the collapsed state of the present embodiment, FIG. 2 is a perspective view showing the configuration of the collapsed state of the present embodiment, and FIG. 3 is a perspective view showing the configuration of the fixed frame of FIG. 4 is an explanatory view showing the configuration of the cam ring of FIG. 1, FIG. 5 is a cross-sectional view showing the configuration of the imaging state of the present embodiment, and FIG. 6 is a perspective view showing the configuration of the imaging state of the present embodiment.
[0024]
In the present embodiment, as shown in FIGS. 1 and 2, a fixed frame 5 is assembled and fixed to the substrate 12, and the fixed group 5 is fixed to the first group lens cell 2 holding the first group lens L 1. The frame 3 is fitted movably in the optical axis direction. The fixed frame 5 is formed in a cylindrical shape as shown in FIG. 3, and a first group liner slot 5a and a second group liner slot 5b are formed on the peripheral surface thereof in parallel with the optical axis.
The first group frame 3 is integrally formed with a liner follower portion 3a protruding from the outer peripheral surface thereof, and the cam follower 4 is fixed to a protruding end of the liner follower portion 3a by a cam follower set screw 4a.
The liner follower 3a is engaged with the group liner slot 5a formed in the fixed frame 5 to restrict the rotation of the group frame 3 around the optical axis. A group of cams formed as shown in FIG. 4 is formed on a cam ring 7 provided at an end so as to be rotatable about an optical axis while being opposed to the peripheral surface of the fixed frame 5. It is engaged in the slot 17.
[0025]
On the other hand, the shutter 6a and the second group lens L2 are held by the second group frame 6, and the second group frame 6 is fitted to the fixed frame 5 movably in the optical axis direction. A cam follower 19 is provided so as to protrude from the outer peripheral surface of the second group frame 6 by a cam pin press-fitted and fixed to the second group frame 6 so as to protrude from the outer peripheral surface of the second group frame 6. The second group frame 6 is engaged with the group liner slot 5b to restrict the rotation of the second group frame 6 about the optical axis. Further, the tip of the cam follower 19 is disposed in close proximity to the peripheral surface of the fixed frame 5. The cam ring 7 is engaged with a second group cam slot 18 formed in the cam ring 7. Further, in the first group frame 3, a spring 13 for loosening between the first group frame 3 and the second group frame 6 is provided.
[0026]
By the way, a CCD holder 11 is fixed to the substrate 12, and a CCD 10 is held by the CCD holder 11, and a low-pass filter 9 fixed to the substrate 12 is arranged in close proximity to the CCD 10. Further, a motor 20 is fixed to the substrate 12 and disposed inside the cam ring 7. Further, inside the cam ring 7, a third group frame 8 holding a third group lens L <b> 3 It is arranged movably in the direction.
[0027]
In the present embodiment, an object for preventing intrusion of external light, dust, and the like that enter the inside of the lens barrel from a direction perpendicular to the optical axis through an opening including the first group cam slot 17 and the second group cam slot 18. As shown in FIG. 2, a light-shielding sheet 1 made of an elastic resin material having a light-shielding property for preventing a body is formed by a positioning hole 1a provided in the light-shielding sheet 1 and a positioning boss 7a provided on the outer periphery of the cam ring 7. , Are positioned on the cam ring 7 and are adhesively fixed to the cam ring 7 by an adhesive applied to one surface of the light shielding sheet 1. In this case, the light shielding sheet 1 is bonded to the lens barrel LB at a position on the cam ring 7 corresponding to the opening including the first group cam slot 17 and the second group cam slot 18 whose positions are set in advance. Fixed.
It should be noted that the light-shielding sheet 1 itself can be made of a single-sided adhesive tape or a double-sided adhesive tape in order to make the bonding easier.
[0028]
On the other hand, at the end of the cam ring 7 on the substrate 12 side, as shown in FIG. 2, a gear ring 8 is fixed to the cam ring 7, and a zoom drive transmission system gear portion 15 is attached to the substrate 12, and the zoom drive transmission system A drive gear 16 for rotating and driving the gear ring 7 is connected to the gear portion 15, and is driven via a zoom drive transmission gear portion 15 driven by a belt by a zoom motor 14 disposed on the peripheral surface of the cam ring 7. The gear 16 is rotated, and the rotation of the drive gear 16 causes the gear ring 7 to rotate in a selected direction about the optical axis.
Here, the gear ring 8, the driving gear 16, the zoom drive transmission system gear unit 15, and the zoom motor 14 constitute a rotating unit. The position corresponding to the opening existing in the cam ring 7 is shielded by the gear ring 8 at the end of the cam ring 7 on the substrate 12 side by the gear ring 8 constituting the rotating means.
[0029]
In this case, the light shielding sheet 1 is notched in the area where the zoom motor 14 is provided, and the light shielding sheet 1 is positioned by the positioning holes 1 a and the positioning bosses 7 a provided on the outer periphery of the cam ring 7. Then, at the end position on the substrate 12 side, the high-precision adhesive fixing of the light shielding sheet 1 is performed easily and quickly so as to properly shield the opening located in the cam ring 7. Have been.
In contrast to the present embodiment having such a configuration, a camera such as a digital camera is configured by attaching a camera unit having a photographing electronic optical system as an image input device to the substrate 12, for example.
[0030]
The operation of the present embodiment relating to the lens barrel having the above-described configuration and the operation of the camera equipped with the present embodiment will be described.
When shifting the lens barrel LB from the collapsed state shown in FIGS. 1 and 2 to the photographing state shown in FIGS. 5 and 6, the lens barrel LB is moved to the fixed frame 5 based on a start signal input by the operator. The first group frame 3 which is fitted and is movable in the optical axis direction while holding the first group lens group L1 and having the cam follower 4 projecting therefrom, and similarly holding the second group lens group L2 fitted to the fixed frame 5 The zoom motor 14 provided at the exit side end of the light passing through the lens groups L1 and L2 provided on the second group frame 6 which is movable in the optical axis direction and is provided on the second group frame 6 provided with the cam follower 19 protruding therefrom operates. State.
When the zoom motor 4 rotates in a predetermined direction, the cam followers 4 and 19 are respectively engaged with the outer peripheral surface of the first group frame 3 via the zoom drive transmission gear unit 15 and the drive gear 16. The cam ring 7 having the first group cam slot 17 and the second group cam slot 18 rotates in a predetermined direction about the optical axis.
[0031]
In this state, the cam follower 4 is engaged with the first group liner slot 5a formed on the fixed frame 5, and the cam follower 19 is engaged with the second group liner slot 5b, and the optical axes of the first group frame 3 and the second group frame 6 are formed. The rotation of the cam followers 4 and 19 respectively engaged with the first group liner slot 5a and the second group liner slot 5b is restricted to the first group cam formed on the cam ring 7. The slot 17 and the second group cam slot 18 are also engaged.
For this purpose, the cam follower 4 engaging with the first group liner slot 5a and the first group cam slot 17 by the rotation of the cam ring 7 in the predetermined direction through the gear ring 8 by the drive gear 16, the second group liner groove The cam follower 19 that engages with the hole 5b and the second group cam groove 18 moves, and the first group frame 3 and the second group frame 6 move in the optical axis direction based on the movement. The third lens group frame 8 moves in the optical axis direction, and the lens barrel shifts from the collapsed state shown in FIGS. 1 and 2 to the photographing state shown in FIGS. The zoom shooting conditions are set.
Then, a photographing operation under the set zoom photographing conditions is performed by a digital camera including a camera unit having a photographing electronic optical system mounted on the substrate 12 of the lens barrel LB.
In this case, it is also possible to use the lens barrel as a miniature structure that can be inserted into the body, the image input device as an endoscope camera for photographing a predetermined part of the patient's body, and incorporate the whole into the endoscopic treatment system It is.
[0032]
By the way, in the present embodiment, as described above, in the lens barrel LB, through the opening including the first group cam slot 17 and the second group cam slot 18, the lens mirror is viewed from a direction perpendicular to the optical axis. A light-shielding sheet 1 made of an elastic resin material having a light-shielding property for preventing an object to be prevented from entering the inside of the body LB, such as external light or dust, is provided on a cam ring 7 with a positioning hole 1a provided in the light-shielding sheet 1 and a cam. Positioned by a positioning boss 7a provided on the outer periphery of the ring 7, the adhesive applied to one surface of the light-shielding sheet 1 is applied to an opening including the first group cam slot 17 and the second group cam slot 18 specified in advance. It is adhesively fixed to the outer peripheral position of the corresponding cam ring 7.
Further, at the end of the cam ring 7 on the substrate 12 side, a position corresponding to the opening present in the cam ring 7 is shielded by the gear ring 8.
[0033]
For this reason, according to the present embodiment, the intrusion of the object to be prevented from intrusion of external light or dust from the direction perpendicular to the optical axis with respect to the lens barrel LB can be reduced with a simple and compact structure, thereby reducing the manufacturing cost. The camera can be almost completely prevented, and shooting with the camera mounted can be performed in a state where external light and dust are completely prevented from entering, and high-quality image shooting can be performed. become.
Further, the light-shielding sheet 1 is positioned by the positioning holes 1 a provided on the cam ring 7 on the light-shielding sheet 1 and the positioning bosses 7 a provided on the outer periphery of the cam ring 7. Since the adhesive is fixed by the agent, the notch is formed at the position of the member arranged on the peripheral surface of the cam ring 7 with respect to the light shielding sheet 1 so that the member is not influenced by the member arranged on the cam ring 7. In addition, the light-shielding sheet 1 can be easily adhered to the cam ring 7, and the degree of freedom of the members arranged on the cam ring 7 is increased, so that the light-shielding sheet 1 can be easily applied to lens barrels of various shapes. , It is possible to realize light shielding.
[0034]
【The invention's effect】
According to the first aspect of the present invention, when the lens barrel shifts from the collapsed state to the photographing state, the lens follower is fitted to the fixed frame, holds the lens group, is movable in the optical axis direction, and the cam follower is provided so as to protrude. The turning means provided at the end of the lens group of the lens holding frame which is at the exit side of the passing light of the lens group is activated, and the turning means is disposed to face the outer peripheral surface of the lens holding frame and the cam follower is engaged. A cam ring having a cam slot is rotated about the optical axis.
In this state, the rotation of the lens holding frame around the optical axis is regulated by the engagement arrangement of the cam follower with the liner slot formed in the fixed frame, but the engagement is made with the liner slot. Since the tip of the cam follower is also engaged with the cam groove formed in the cam ring, the rotation of the cam ring in a predetermined direction by the rotating means activates the optical axis direction moving means, thereby causing the liner groove to move. The cam follower engaging with the hole and the cam groove moves, and the lens holding frame is moved in the optical axis direction based on the movement, and the lens barrel shifts from the collapsed state to the photographing state.
In this case, since the shielding means prevents the intrusion prevention target including the external light from entering the inside of the lens barrel from a direction perpendicular to the optical axis, the inside of the lens barrel transitioning from the collapsed state to the photographing state is prevented. It is possible to almost completely prevent intrusion of the object to be prevented from entering, such as external light or dust, from a direction perpendicular to the optical axis.
[0035]
According to the second aspect of the invention, by using the shielding sheet formed of the light shielding material as the shielding means, it is possible to further enhance the light shielding effect and realize the effect obtained by the first aspect of the invention.
[0036]
According to the third aspect of the present invention, in addition to the effect obtained by the second aspect of the present invention, the shielding sheet is formed of an adhesive tape, and the adhesive tape is adhered and disposed on the outer peripheral surface of the cam ring. The intrusion of the intrusion prevention target body can be quickly performed by a simple process, so that the manufacturing cost can be reduced and the overall size can be reduced.
[0037]
According to the fourth aspect of the present invention, in addition to the effect obtained by the third aspect of the present invention, the shielding sheet includes a liner slot and a cam slot of the object to be prevented from entering with respect to the outer peripheral surface of the cam ring. Since the adhesive is provided at a corresponding position for preventing the intrusion into the lens barrel through the opening, it is possible to more effectively prevent the intrusion prevention target from intruding into the lens barrel. .
[0038]
According to the fifth aspect of the present invention, the rotation means provided at a position for preventing the intrusion prevention target body from entering the inside of the lens barrel through the opening at the end of the exit side of the light passing through the lens group. As the shielding means, it is possible to realize the effect obtained by the first aspect of the present invention.
[0039]
According to the sixth aspect of the present invention, in addition to the effect obtained by the second aspect of the present invention, the opening portion at the exit side end of the light passing through the lens group by the rotating means. By preventing the intrusion prevention target from entering the inside of the lens barrel through the lens, it is possible to further enhance the effect of preventing the intrusion prevention target from entering the inside of the lens barrel.
[0040]
According to a seventh aspect of the present invention, there is provided an image input apparatus provided with the lens barrel according to any one of the first to sixth aspects. Based on the effects obtained by the invention, it is possible to input a high-quality image.
[0041]
According to the eighth aspect of the present invention, it is possible to perform high quality image capturing based on the effect obtained by the seventh aspect of the present invention, using the camera as an image input device.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a configuration of a lens barrel according to an embodiment of the present invention in a collapsed state.
FIG. 2 is a perspective view showing the configuration of the embodiment in a collapsed state.
FIG. 3 is a perspective view showing a configuration of a fixed frame in FIG. 1;
FIG. 4 is an explanatory diagram showing a configuration of a cam ring of FIG. 1;
FIG. 5 is a cross-sectional view illustrating a configuration of a shooting state according to the embodiment.
FIG. 6 is a perspective view showing a configuration of a shooting state of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shield sheet 3 First group frame 4 Cam follower 5 Fixed frame 5a First group liner slot 5b Second group liner slot 6 Second group frame 7 Cam ring 8 Third group frame 12 Substrate 14 Zoom motor 16 Drive gear 17 First group cam slot 18 Second group cam Slot 19 Cam Follower

Claims (8)

A lens holding frame that is fitted to the fixed frame, holds the lens group, is movable in the optical axis direction, and has a cam follower protrudingly arranged;
A liner slot formed in the fixed frame, the cam follower being engaged and arranged to regulate rotation of the lens holding frame around the optical axis;
A cam ring in which the cam follower is engaged via the liner groove is formed, and a cam ring disposed to face the outer peripheral surface of the lens holding frame,
Turning means provided at an end of the lens holding frame on the emission side of light passing through the lens group, for turning the cam ring;
By the rotation of the cam ring about the optical axis by the rotation means, the cam follower engaging with the liner slot and the cam slot is moved, and the lens holding frame is moved based on the movement. Optical axis direction moving means for moving in the optical axis direction,
Shielding means for preventing intrusion of an intrusion prevention target including external light into the lens barrel from a direction perpendicular to the optical axis. 2. The lens barrel according to claim 1, wherein the shielding means is a shielding sheet formed of a light shielding material. 3. The lens barrel according to claim 2, wherein the shielding sheet is formed of an adhesive tape, and is adhered to an outer peripheral surface of the cam ring. A shielding sheet is adhesively disposed on the outer peripheral surface of the cam ring at a corresponding position for preventing intrusion into the lens barrel through an opening including the liner groove and the cam groove of the target object. The lens barrel according to claim 3, wherein the lens barrel is provided. 2. The rotating device according to claim 1, wherein the shielding means is a rotating means disposed at a position for preventing the intrusion prevention target from entering the inside of the lens barrel through the opening at the emission side end. Lens barrel. The lens barrel according to any one of claims 2 to 4, wherein the rotating means is disposed at a position for preventing the intrusion prevention object from entering the inside of the lens barrel via the exit side end. A lens barrel characterized by being made. An image input apparatus comprising the lens barrel according to any one of claims 1 to 6. The image input device according to claim 7, wherein the image input device is a camera.

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