JP3496667B2 - Zoom lens barrel - Google Patents

Zoom lens barrel

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Publication number
JP3496667B2
JP3496667B2 JP2001251454A JP2001251454A JP3496667B2 JP 3496667 B2 JP3496667 B2 JP 3496667B2 JP 2001251454 A JP2001251454 A JP 2001251454A JP 2001251454 A JP2001251454 A JP 2001251454A JP 3496667 B2 JP3496667 B2 JP 3496667B2
Authority
JP
Japan
Prior art keywords
zoom lens
lens barrel
shutter
opening
photographing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2001251454A
Other languages
Japanese (ja)
Other versions
JP2003066311A (en
Inventor
正明 宮野
Original Assignee
ミノルタ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ミノルタ株式会社 filed Critical ミノルタ株式会社
Priority to JP2001251454A priority Critical patent/JP3496667B2/en
Publication of JP2003066311A publication Critical patent/JP2003066311A/en
Application granted granted Critical
Publication of JP3496667B2 publication Critical patent/JP3496667B2/en
Application status is Expired - Fee Related legal-status Critical
Anticipated expiration legal-status Critical

Links

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens barrel, and more particularly, to a zoom lens barrel having a shutter. [0002] Conventionally, feeding from the camera body at the time of shooting, the non-shooting write James Murenzu barrel counterbore in the camera body at the time, techniques for reducing the optical axis direction dimension of the time of non-shooting, Various proposals have been made. For example, Japanese Patent Application Laid-Open No. H11-119080 discloses that an iris device is biased by a spring so that an iris is separated from an adjacent lens at the time of photographing, while the iris is brought close at the time of non-photographing so that the optical axis at the time of non-photographing A technique for reducing the dimension in the direction is disclosed. Japanese Patent Application Laid-Open No. Hei 10-288731 discloses that
A technology has been disclosed in which a space for accommodating a zoom or focus driving mechanism is provided in a zoom lens barrel during non-photographing to reduce the dimension in the optical axis direction during non-photographing. However, in a zoom lens barrel having a shutter, there is a limit in reducing the dimension in the optical axis direction when photographing is not performed due to the effect of the thickness of the shutter. Accordingly, a technical problem to be solved by the present invention is to provide a zoom lens barrel having a shutter, which can further reduce the dimension in the optical axis direction during non-photographing. The present invention provides a zoom lens barrel having the following configuration in order to solve the above technical problems. The zoom lens barrel is of a type that expands and contracts in the optical axis direction, extends when photographing, and retracts when not photographing, and includes a shutter. The shutter is opened during the non-shooting, and at least a part of a lens adjacent to the shutter is housed in an opening of the shutter. In addition, at the time of the above-mentioned non-shooting, zoom lens
Interfering with the light beam passing through the inside of the lens barrel, it blocks light,
A shield that retracts from the light flux that passes through the zoom lens barrel and forms an image
An optical member is provided. According to the above configuration, at least a part of the lens of the zoom lens barrel is housed in the opening of the shutter during non-shooting, so that the dimension in the optical axis direction during non-shooting can be further reduced. is there. Also, when not shooting
Interferes with light passing through the inside of the zoom lens barrel
The color filter for the image sensor is
Exposure to external light accelerates deterioration (fading) even during non-shooting
To prevent exposure of the photographic film during non-shooting.
Can be [0010] Preferably, an aperture is provided for opening at the time of non-photographing and for accommodating at least a part of the lens in the opening. According to the above arrangement, when the zoom lens barrel is provided with a stop, at least a part of the lens is housed in the aperture of the stop during non-photographing, so that the size in the optical axis direction can be further reduced. It is. Preferably, the aperture of the shutter is larger than an aperture required optically at the time of the photographing (that is, an aperture for preventing a light beam formed by a zoom lens barrel from forming an image). It has an opening diameter. According to the above configuration, it is possible to increase the diameter of the opening of the shutter so that, for example, the entire lens or the lens frame outside the lens can be accommodated in the opening of the shutter during non-shooting. Therefore, the lenses on both sides of the shutter can be made closer to each other without being restricted by a portion outside the opening of the shutter, and the size of the zoom lens barrel in the optical axis direction when not photographing can be reduced. Preferably, the aperture of the stop is larger than the aperture required optically at the time of photographing (that is, the aperture for preventing the light beam formed by the zoom lens barrel from blocking the image). Has a caliber. According to the above arrangement, when the zoom lens barrel has a stop, the opening diameter of the stop is increased so that, for example, the entire lens or the lens frame outside the lens is moved to the inside of the stop during non-photographing. Can be stored in Therefore, it is possible to make the lenses on both sides of the stop approach each other without being restricted by the portion outside the aperture of the stop, and to reduce the size of the zoom lens barrel in the optical axis direction during non-photographing. Preferably, the light-shielding member is a lens barrier that covers an object end surface of the zoom lens barrel so as to be openable and closable. According to the above configuration, the size of the zoom lens barrel in the optical axis direction can be reduced with a simple configuration by using the light shielding member also as the lens barrier. [0020] Preferably, the lens barrier is constituted by two blade members. According to the above configuration, the number of blade members is reduced, the lens barrier is made as thin as possible, and the size of the zoom lens barrel in the optical axis direction can be further reduced. [0022] Preferably, the shutter and the lens adjacent to the shutter are held by the same holding member so as to be relatively movable. According to the above configuration, it is easy to configure so that at least a part of the adjacent lens enters the opening of the shutter during non-shooting and retreats from the opening of the shutter during shooting. Further, the present invention provides a camera provided with the zoom lens barrel of each of the above-described configurations. Embodiments of the present invention will be described below with reference to FIGS. 1 to 11. First, an embodiment of the present invention will be described with reference to FIGS. FIGS. 1 to 3 show a zoom lens barrel 10 used in a digital camera. 1 and 2 are cross-sectional views of the zoom lens barrel 10 at the time of shooting (extended state). FIG. 1 shows the maximum focal length (telephoto end), and FIG. 2 shows the minimum focal length (wide-angle end). Show. FIG. 3 is a cross-sectional view of the zoom lens barrel 10 during non-photographing (collapsed state). In the zoom lens barrel 10, a cam ring 24, a rectilinear barrel 25, and a forward barrel 26 are arranged inside a fixed barrel 22. On the outside of the fixed cylinder 22, a long gear 20 is fixed.
2 and is arranged in parallel with the optical axis, and is rotationally driven by a zoom drive actuator (not shown). The cam ring 24 and the forward barrel 26 project and retract from the fixed barrel 22 by the rotation of the long gear 20, whereby the light of the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 is changed. The relative position in the axial direction changes. At the rear end of the zoom lens barrel 10, a CCD image pickup device 15 can be fixed. At the rear end of the fixed cylinder 22, the fourth lens group 14
Is fixed. As shown in the cross-sectional view of FIG. 5A and the developed view of FIG. 5B, a spiral first portion 22 a extending in the circumferential direction and the axial direction is provided on the inner peripheral surface of the fixed cylinder 22. The cam grooves 22a and 22b are formed by a second portion 22b extending in the direction, and a straight guide groove 22s extending in the axial direction and penetrating in the radial direction is formed. The cam ring 24 is arranged inside the fixed cylinder 22, and a pin 24 a protruding outward on the outer peripheral surface thereof is adapted to engage with the cam grooves 22 a and 22 b of the fixed cylinder 22. . A gear portion 24b is formed at the rear end of the outer peripheral surface of the cam ring 24 so as to mesh with the long gear 20 that enters from one of the straight guide grooves 22s of the fixed cylinder 22. As shown in the cross-sectional view of FIG. 5C and the developed view of FIG.
On the inner peripheral surface of the cam ring 24, first cam grooves 24q and 24r each including a spiral first portion 24q and a substantially V-shaped second portion 24r, and a first portion extending in the axial direction. 24s
The second cam grooves 24s and 24t are formed by the second cam grooves 24s and 24t. The rectilinear barrel 25 is disposed inside the cam ring 24, and is engaged with the cam ring 24 so as to be rotatable and immovable in the axial direction. At the rear end of the rectilinear cylinder 25, an engagement piece 25a is protruded, and engages with a rectilinear guide groove 22s provided on the fixed cylinder 22. Thereby, the straight traveling cylinder 25 is
It is guided in the axial direction while its rotation is restricted. The advance barrel 26 is disposed inside the cam ring 24. A pin 26 a protrudes outward from the outer peripheral surface of the forward cylinder 26, and engages with the first cam grooves 24 q and 24 r of the cam ring 24. On the inner peripheral surface of the forward cylinder 26,
A rectilinear groove 26b extending in the optical axis direction is formed.
5 is movably engaged in the axial direction, and the forward barrel 26 is
The rotation is regulated by the. Forward cylinder 26
A lens barrier 16 and a first lens frame 11a that holds the first lens group 11 are fixed to the front end of the lens group. The lens barrier 16 is, as shown in FIG.
The two blade members 16a and 16b supported by the support shafts 16s and 16t respectively close the opening 16d of the base plate 16c (shown by a solid line) and the open position retracted from the opening 16d (shown by a dotted line). It turns between. The blade members 16a and 16b are urged to an open position by a spring (not shown), and the lens barrier 16 is opened in a photographing state. On the other hand, when the zoom lens barrel 10 is retracted, the tip of the rectilinear barrel 25 is moved to the blade members 16a, 16b.
, And against the spring biasing force, the blade members 16a, 16b
Is driven to the closed position, and the lens barrier 16 is closed. The lens barrier 16 includes two blade members 16.
Therefore, the axial dimension can be reduced by the thickness of one blade member as compared with the case of four blade members. The moving frame 18 is arranged inside the straight barrel 25. A second group lens frame 12a that holds the second lens group 12, a shutter unit 17, and a focus unit (not shown) are fixed to the moving frame 18. The shutter unit 17 includes a shutter curtain, an aperture, and an actuator for driving them. The shutter curtain and the aperture are normally located outside the opening 17a of the shutter unit 17, and enter the inside of the opening 17a during photographing. Instead of providing a mechanical shutter mechanism independently of the diaphragm, opening and closing of the diaphragm may be used as a shutter. In any case, the opening diameter of the opening 17a of the shutter unit 17 is larger than the optically necessary opening diameter, and as will be described in detail later, the third lens group 13 and the third group lens frame 13a Part is to be able to enter. The third lens group 1 is located at the rear end of the moving frame 18.
The third lens frame 13a holding the third lens unit 13a is fixed so as to be movable in the optical axis direction, and is driven in the optical axis direction by a focus unit (not shown). The movable frame 18 has a pin 18a projecting radially outward, and a second portion 24 of the second cam groove of the cam ring 24.
t. The moving frame 18 is engaged with the rectilinear barrel 25 movably in the axial direction, rotation thereof is regulated, and the moving frame 18 is guided in the axial direction. Next, the operation of the zoom lens barrel 10 will be described. When the zoom lens barrel 10 is not photographed,
As shown in FIG. 3, a collapsed state is obtained in which the total length is the shortest. At this time, the shutter unit 17 is in a state where the opening 17a is open (that is, a state where both the shutter and the aperture are retracted to the outside of the opening 17a). A part of the third group ball frame 13a enters. Thus, the distance between the second and third lens groups 12, 13 is made as short as possible while avoiding the interference of the shutter unit 17, and the total length of the zoom lens barrel 10 when retracted is made smaller than that of the conventional one. be able to. When the long gear 20 is rotated by a zoom drive actuator (not shown), the cam ring 24 is rotated, and FIG.
7B, the pin 24a moves along the first portion 22a of the cam groove of the fixed cylinder 22 as indicated by an arrow 80, and the cam ring 24 is extended from the fixed cylinder 22. At this time, the gear portion 24b of the cam ring 24 moves in the axial direction along the long gear 20 while maintaining meshing with the long gear 20. At the same time, the pin 26a moves along the first portion 24q of the first cam groove of the cam ring 24 as indicated by an arrow 82 in FIG. . Also, as shown by the arrow 86, the cam ring 24
The pin 18a moves along the second portion 24t of the second cam groove, and the moving frame 18 moves rearward with respect to the cam ring 24. Then, as shown in FIG. 2, the zoom lens barrel 10 is fully extended, and is in a photographing state. At this time, the focal length of the zoom lens barrel 10 is the minimum, that is, the wide-angle end. Further, when driven, the pin 24a moves along the second portion 22b of the cam groove of the fixed cylinder 22 as shown by an arrow 81 in FIG. The state extended from 22 is maintained. On the other hand, the pin 26a of the forward barrel 26 moves along the second portion 24r of the first cam groove of the cam ring 24 as shown by an arrow 83 in FIG. Unfold. Also,
The pin 18a of the moving frame 18 moves forward with respect to the cam ring 24 along the second portion 24t of the second cam groove of the cam ring 24, as indicated by an arrow 85. When it is most driven, as shown in FIG. 1, the zoom lens barrel 10 has a maximum focal length, that is, a telephoto end. Next, an operation sequence of the digital camera using the zoom lens barrel 10 will be described. When the main switch is OFF, the shutter is generally closed in a conventional camera, but in a digital camera using the zoom lens barrel 10, the shutter is open as described above. Also, the aperture is in a greatly opened state. At this time, the lens barrier 16
Is closed, so even if the shutter is open, the CCD
The color filters and the like for the image sensor 15 can be protected from external light. When the main switch is turned on, the zoom lens barrel 10 extends from the retracted state to the wide-angle end while the shutter is open. Lens barrier 1 during extension
6 is opened, and previewing is possible in the shooting state. Note that the lens barrier 16 may be opened at the wide-angle end. When the zoom button of the digital camera is operated,
The focal length of the zoom lens barrel 10 can be changed. When the shutter button of the digital camera is pressed,
Take a picture. Specifically, after the electric charge of the CCD image sensor 15 is once released, exposure is started. At this time, the aperture of the aperture becomes smaller up to the set aperture value. At the time of the proper exposure, the shutter is closed, and the data (charge accumulated in the CCD image sensor 15) is read. When the data reading is completed, the shutter is opened again, and the aperture is greatly opened. When the main switch is turned off, the shutter of the zoom lens barrel 10 is opened, the aperture is retracted with the aperture largely opened, and the zoom lens barrel 10 returns to the retracted position. On the way, the lens barrier 16 closes. As described above, the zoom lens barrel 1
0 indicates that the third lens group 13 and part of the third lens frame 13a can be inserted into the opening 17a of the shutter unit 17, so that the opening diameter of the shutter and the aperture is smaller than the diameter determined by a normal optical system. Also need to be increased. For this reason, the outer diameter tends to increase as the thickness is reduced in the axial direction. However, when the outer diameter is increased, the space for retreating the blade members 16a and 16b of the lens barrier 16 can be increased. Therefore, the blade members 16a and 16b are enlarged to reduce the number of the blade members 16 to make the lens barrier 16 thinner and zoom. The axial dimension of the lens barrel 10 can be further reduced. Further, as the diameter is increased, a stepping motor having a larger outer diameter (a motor having a large torque margin and a low cost) or the like can be used as an actuator of the shutter unit 17 or the focus unit. When the zoom lens barrel 10 is used in a silver halide camera (lens shutter camera), light is leaked to the film because the shutter is open when retracted.
In order to prevent this, it is necessary to provide a light shielding member separately from the shutter. For example, it is necessary to configure the lens barrier 16 to have a sufficient light shielding property. The light blocking member may be provided in the zoom lens barrel without providing the lens barrier 16 on the object side end surface of the zoom lens barrel 10. In this case, if the moving amount of the optical system is large, With the two-stage extension type zoom lens barrel, the cam does not enter and it has to be three-stage extension,
As a result, the outer diameter of the zoom lens barrel may increase. In addition, a light blocking member may be provided in the camera body. In this case, however, since the optical path diameter is large, the retreat space for the light blocking member is also increased radially outward, and the camera body becomes large. FIGS. 6 to 8 show a modified zoom lens barrel 10s.
Is shown. 6 and 7 are cross-sectional views of the zoom lens barrel 10s at the time of shooting (extended state).
FIG. 7 shows the wide-angle end. FIG. 8 is a cross-sectional view during non-photographing (collapsed state). Since the zoom lens barrel 10s of the modification is configured substantially similarly to the zoom lens barrel 10 of the embodiment, the same reference numerals are used for the same components. The following description focuses on the differences. In the zoom lens barrel 10 s according to the modification, a shutter unit 19 having the same configuration as that of the embodiment and a focus unit (not shown) are fixed to a moving frame 18 disposed inside a rectilinear barrel 25. . Unlike the embodiment, the second lens group frame 12s that holds the second lens group 12 is disposed behind the shutter unit 19, and is supported by the movable frame 18 so as to be movable in the optical axis direction. Shutter unit 1
A spring 19s is arranged between the ninth lens frame 12 and the second lens frame 12s, and the second lens frame 12s is urged in a direction away from the shutter unit 19 (backward). In the photographing state, as shown in FIGS. 6 and 7, the second lens group frame 12s is moved backward by the bias of the spring 19s, and the second lens group 12 is
Located away from 9. On the other hand, in the non-shooting state, as shown in FIG. 8, the spring 19s is compressed, and the second lens group 12 and the second lens frame 12s move to the shutter unit 19 side. Then, the second lens group 12 and a part of the second group frame 12s enter into the opening 19a of the shutter unit 19 in the opened state. 9 to 11 show a zoom lens barrel 50 of a comparative example. 9 and 10 are cross-sectional views of the zoom lens barrel 50 at the time of shooting (extended state). FIG. 9 shows a telephoto end, and FIG. 10 shows a wide-angle end. FIG. 11 is a cross-sectional view during non-photographing (collapsed state). The zoom lens barrel 50 of the comparative example is configured substantially in the same manner as the zoom lens barrel 10 of the embodiment. That is, inside the fixed barrel 62 of the zoom lens barrel 50, there are a cam ring 64, a straight barrel 65, and a forward barrel 66.
Are disposed, and the cam ring 64 and the forward barrel 66 are protruded and retracted from the fixed barrel 62 by the rotation of the long gear 60, whereby the first
The relative positions in the optical axis direction of the lens group 51, the second lens group 52, the third lens group 53, and the fourth lens group 54 change. CC at the rear end of the zoom lens barrel 50
The D imaging element 55 can be fixed. A moving frame 58 to which the shutter unit 57 and the like are fixed is disposed inside the rectilinear barrel 65. Pins 58a, 64a, 66a
The gear portion 64b, the engagement piece 65a, and the like are also configured in the same manner as in the embodiment. On the other hand, unlike the embodiment, the design is such that the opening 57a of the shutter unit 57 is closed during non-photographing (collapsed state). Therefore, as shown in FIG. 11, the second and third lens groups 52 and 53 are separated by the thickness of the shutter unit 57. Therefore, the total length of the zoom lens barrel 50 in the retracted state is
It must be longer than the zoom lens barrel 10 of the embodiment. It should be noted that the present invention is not limited to the above-described embodiments and modifications, but can be implemented in various other modes. For example, when the aperture of the shutter is smaller than the outer diameter of the lens, a part of the lens (for example, a curved portion of a convex lens) is included in the aperture of the shutter when photographing is not performed.
May be included. The zoom lens barrel according to the present invention is not limited to photographing, but is applicable to, for example, projection.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a zoom lens barrel according to an embodiment of the present invention. FIG. 2 is a sectional view of a zoom lens barrel according to the embodiment of the present invention. FIG. 3 is a sectional view of a zoom lens barrel according to the embodiment of the present invention. FIG. 4 is a configuration diagram of the lens barrier of FIGS. 1 to 3; FIG. 5 is a sectional view and a development view of the fixed cylinder and the cam ring of FIGS. 1 to 3; FIG. 6 is a sectional view of a zoom lens barrel according to a modification. FIG. 7 is a sectional view of a zoom lens barrel according to a modification. FIG. 8 is a sectional view of a zoom lens barrel according to a modification. FIG. 9 is a sectional view of a zoom lens barrel of a comparative example. FIG. 10 is a sectional view of a zoom lens barrel according to a comparative example. FIG. 11 is a sectional view of a zoom lens barrel according to a comparative example. [Description of Signs] 10, 10s Zoom lens barrel 12 Second lens group (lens) 16 Lens barrier (light shielding member) 16a, 16b Blade member 17, 19 Shutter unit (shutter, aperture) 17a, 19a Opening

Continuation of the front page (51) Int.Cl. 7 identification symbol FI G03B 9/02 G03B 9/08 Z 9/08 17/04 17/04 G02B 7/04 Z (58) Field surveyed (Int.Cl. 7 G02B 7/02-7/16 G03B 17/04-17/17 G03B 9/00-9/54

Claims (1)

  1. (57) [Claim 1] In a zoom lens barrel that expands and contracts in the direction of the optical axis, extends during photographing, and retracts during non-imaging, an adjacent lens is opened in the above non-imaging state and has an opening in its opening. Rutoto comprising a shutter at least partially housed in
    In addition, during the above-mentioned non-photographing, the light flux passing through the inside of the zoom lens
    During the shooting, the inside of the zoom lens
    A zoom lens barrel, comprising: a light-blocking member that retreats from a light flux that forms an image . 2. Opening at the time of non-photographing, and inside the opening,
    2. The zoom lens barrel according to claim 1, further comprising a stop that accommodates at least a part of the lens. 3. The zoom lens barrel according to claim 1, wherein said opening of said shutter has an opening diameter larger than an optically necessary opening diameter at the time of said photographing. 4. The zoom lens barrel according to claim 1, wherein the shutter and the lens adjacent to the shutter are held by the same holding member so as to be relatively movable.
JP2001251454A 2001-08-22 2001-08-22 Zoom lens barrel Expired - Fee Related JP3496667B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001251454A JP3496667B2 (en) 2001-08-22 2001-08-22 Zoom lens barrel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001251454A JP3496667B2 (en) 2001-08-22 2001-08-22 Zoom lens barrel

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JP2003066311A JP2003066311A (en) 2003-03-05
JP3496667B2 true JP3496667B2 (en) 2004-02-16

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US6835006B2 (en) 2002-04-19 2004-12-28 Fuji Photo Optical Co., Ltd. Lens barrel and camera
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JP4520253B2 (en) * 2004-09-02 2010-08-04 Hoya株式会社 Lens barrel
JP4708753B2 (en) * 2004-09-29 2011-06-22 キヤノン株式会社 Lens barrel and imaging apparatus having the same
JP4691675B2 (en) * 2005-02-22 2011-06-01 コニカミノルタオプト株式会社 Lens barrel and camera equipped with the lens barrel
JP2006293200A (en) * 2005-04-14 2006-10-26 Nikon Corp Lens barrel of camera
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JP2007114532A (en) * 2005-10-20 2007-05-10 Sony Corp Lens barrel
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JP2010049022A (en) * 2008-08-21 2010-03-04 Ricoh Co Ltd Lens driving device, lens barrel, and camera
JP2010262177A (en) * 2009-05-08 2010-11-18 Olympus Imaging Corp Camera unit
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JP2011002743A (en) 2009-06-22 2011-01-06 Hoya Corp Zoom lens barrel including variable aperture stop mechanism
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JP5570264B2 (en) * 2010-03-24 2014-08-13 キヤノン株式会社 Lens barrel and imaging device
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US8861098B2 (en) 2008-12-27 2014-10-14 Canon Kabushiki Kaisha Lens barrel and imaging apparatus

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