Close-up assist device

Abstract

To provide a close-up assist device that reduces the influence of the surrounding environment of a subject and allows for easy macrophotography.SOLUTION: A close-up assist device is detachably mounted to a close-up lens body that is detachably attached to a front surface of a lens unit of a camera. The close-up assist device includes: a ring-shaped body part that is attached to an outer peripheral surface of the close-up lens body along the optical axis of the close-up lens body; and a focal position indicator of the close-up lens body that is provided on the ring-shaped body part and can be arranged so as to protrude forward along the optical axis of the close-up lens body.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a close-up assistance device.

Background Art

[0002] Cameras without an autofocus function need to perform focusing visually. Action cameras, etc., do not have a focus function, but use a single-focus wide-angle lens close to a fish-eye lens, so the depth of field in focus is deep, and photos and videos can be taken in focus without problems within the depth of field. Also, these cameras use a close-up lens for close-up shooting. However, when shooting a small subject, the focus position is a few centimeters in front of the lens and the depth of field is shallow, making it difficult to focus. As a technique for assisting focusing in close-up shooting, a close-up assistance device equipped with a distance rod has been proposed.

[0003] For example, Patent Document 1 discloses a camera including two pointers supported by a lens barrel so as to open and close symmetrically with respect to the optical axis at a length serving as an index of the shooting distance from the camera to the subject. This device sets the shooting range corresponding to the width of the imaging surface according to the opening degree of each pointer, and sets the shooting distance from the camera to the subject by bringing the subject into contact with the extended end tube of the pointer, and can confirm the shooting distance and shooting range with reference to the pointer without looking through the viewfinder. As a result, it is possible to confirm the shooting distance with reference to the pointer without looking through the viewfinder, and it is possible to easily perform shooting at a closest distance where it is likely to be in an awkward position to set the shooting conditions by looking through the viewfinder.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when the subject is a moving organism, it is not easy to take a picture because the pointer will escape from inside the pointer when the pointer is brought closer. In addition, since the pointer disclosed in Patent Document 1 is fixed to the camera, even when photographing a stationary subject, photographing using this close-up frame is effective for true overhead (from directly above) photography or panning photography, but in oblique overhead photography from an oblique upward direction, depending on the shooting direction, the pointer hits the peripheral part such as sandy ground or rock, and it is difficult to place the subject in the intended position within the screen in a focused state.

[0006] An object of the present invention is to provide a close-up assisting device that reduces the influence of the environment around the subject and enables easy macro photography.

Means for Solving the Problems

[0007] The close-up assisting device according to the present invention is a close-up assisting device that is detachably attached and fixed to a close-up lens body that is detachably attached to the front surface of the lens unit of a camera, and includes an annular main body portion attached to the outer peripheral surface portion of the close-up lens body along the optical axis of the close-up lens body, and a focus position indicator of the close-up lens body provided on the annular main body portion and capable of being protruded forward along the optical axis of the close-up lens body.

Effects of the Invention

[0008] According to the present invention, it is possible to provide a close-up assisting device that reduces the influence of the environment around the subject and enables easy macro photography.

Brief Description of the Drawings

[0009]

Figure 1

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Figure 12

Mode for Carrying Out the Invention

[0010] (Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a front perspective view of the imaging device 1 with the copying assist device 4 attached as seen from above the front side. FIG. 2 is a rear perspective view of the imaging device 1 with the copying assist device 4 attached as seen from below the rear side. Further, FIG. 3 is a front exploded perspective view of the imaging device 1, and FIG. 4 is a rear exploded perspective view of the imaging device 1. In the following description of the imaging device 1 (the same applies to the imaging devices 1A and 1B described later), the side of the close-up lens body 3 is the front, the opposite side is the rear, the right side when the imaging device 1 is viewed from the front side is the right, and the opposite side is the left. Also, the side of the connecting portion 24 of the imaging device 1 is the bottom, and the opposite side is the top.

[0011] The photographing apparatus 1 includes a camera 2, a close-up lens body 3 that is detachably attached to the front surface of the lens unit 221 (see FIG. 3) of the camera 2, and a close-up assisting device 4 that is detachably attached and fixed to the close-up lens body 3. The camera 2 of the present embodiment is formed by housing a camera body 21 in a waterproof case 22 and can be used as an underwater camera. A rod-shaped handle member or the like can be attached to the connecting portion 24.

[0012] As shown in FIG. 3, the case 22 has a guide portion 222 that protrudes in a substantially arc shape in a front view at the front portion of the outer peripheral edge of the lens unit 221. The guide portion 222 is intermittently provided at two upper and lower positions symmetric with respect to the optical axis L. As shown in the enlarged view A of the lower guide portion 222, a top surface guide portion 222a, a regulating protrusion 222b protruding from the inner peripheral side surface, and an engaging portion 222c are formed on the arcuately curved inner peripheral surface of the guide portion 222.

[0013] The top surface guide portion 222a protrudes from the inner peripheral surface of the guide portion 222 over the circumferential direction around the optical axis L. The top surface guide portion 222a restricts the forward movement of the close-up lens body 3 attached to the case 22 along the optical axis L. The regulating protrusion 222b is formed in a substantially rectangular parallelepiped shape. The engaging portion 222c is a cylindrical protrusion portion having a major axis in a direction substantially parallel to the optical axis L. The engaging portion 222c is provided between the regulating protrusion 222b and the top surface guide portion 222a in proximity to the regulating protrusion 222b. The guide portion 222 has an opening 222d penetrating in the radial direction of the optical axis L at a circumferential position opposite to the engaging portion 222c (see also FIG. 5). The upper guide portion 222 also has a top surface guide portion 222a, a regulating protrusion 222b protruding from the inner peripheral side surface, and an engaging portion 222c at a symmetric position of the optical axis L as in the lower guide portion 222 (details are not shown).

[0014] The close-up lens body 3 is, for example, a close-up lens. The close-up lens body 3 has an annular support 32 and a lens member 31 supported around the outer periphery by the support 32. As shown in the enlarged view of part B in Fig. 4, on the back surface, the close-up lens body 3 has a guided portion 321 on the outer peripheral surface of the support 32. The guided portion 321 is formed to project across the circumferential direction of the optical axis L. At one end of the guided portion 321 in the counterclockwise direction in a rear view, a concave engaged portion 322 that is cylindrically recessed is formed. The enlarged view of Fig. B shows the upper guided portion 321, but the lower guided portion 321 provided symmetrically with respect to the optical axis L also has an engaged portion 322 and is similarly configured.

[0015] As shown in Fig. 3, the close-up assisting device 4 has an annular main body portion 41 attached to the outer peripheral surface portion of the close-up lens body 3 along the optical axis L of the close-up lens body 3, an annular fixing member 42 for fixing the annular main body portion 41 to the close-up lens body 3, and a rod-shaped body 43 provided on the annular main body portion 41.

[0016] A male screw portion is formed on the outer peripheral surface 411 of the annular main body portion 41 (not shown). Also, a female screw portion is formed on the inner peripheral surface 421 of the annular fixing member 42 shown in Fig. 4 (not shown). The annular main body portion 41 is detachably fixed to the close-up lens body 3 by the annular fixing member 42. A specific attachment method will be described with reference to the cross-sectional view I-I in Fig. 5. First, the annular main body portion 41 is arranged rearward with respect to the close-up lens body 3, and the two guided portions 321 of the close-up lens body 3 are arranged in the open portion 223 between the respective guide portions 222 of the case 22. In this state, the close-up lens body 3 is rotated relative to the case 22 in the clockwise direction in Fig. 5. Then, the guided portion 321 moves inside the guide portion 222. When the guided portion 321 moves inside the guide portion 222, the end portion 321a on the advancing direction side of the guided portion 321 can rotate around the rotation axis 23a against the elastic force of the protruding restricting portion 231 of the locking member 23 by the elastic portion 232 in the shape of a cantilever spring and be pushed back to the outer diameter side of the optical axis L. When the end portion 321a moves to the regulating projection 222b, the engaged portion 322 of the guided portion 321 engages with the engaging portion 222c. In the engaged state between the engaged portion 322 and the engaging portion 222c, the end portion 321b on the side opposite to the end portion 321a of the guided portion 321 abuts against the regulating portion 231 of the locking member 23 pushed through the opening 222d by the elastic force, and the rotation in the escape direction (i.e., the counterclockwise direction) is restricted. Thereby, the copying lens body 3 and the case 22 are mounted.

[0017] With the copying lens body 3 fixed to the case 22, when the annular fixing member 42 is disposed in front of the copying lens body 3 and the annular main body portion 41 and the annular fixing member 42 are screwed together so as to sandwich the copying lens body 3 from the front and rear, the annular main body portion 41 is fixed to the copying lens body 3.

[0018] Note that the annular main body portion 41 and the annular fixing member 42 can restrict the relative rotation around the optical axis L with respect to the copying lens body 3 by clamping (or sandwiching) the copying lens body 3 in the direction of the optical axis L. The relative fixing between the annular main body portion 41 and the annular fixing member 42 (copying auxiliary device 4) and the copying lens body 3 is not limited to this. For example, a concave portion provided on the outer peripheral edge portion of the copying lens body 3 (for example, the concave portions 323 and 324 in FIG. 4) and a convex portion provided on the inner peripheral portion of the annular main body portion 41 may be engaged to position the relative position around the optical axis L. Alternatively, the concave portion (for example, the concave portions 323 and 324 in FIG. 4) may be engaged or screwed with a screw portion screwed from the rear of the annular main body portion 41 into an arbitrary screw hole 412 provided penetrating in the direction of the optical axis L in the inner peripheral portion of the annular main body portion 41, so as to position the relative position around the optical axis L between the annular main body portion 41 and the copying lens body 3. Further, the screw hole 412 may be provided as an opening hole into which an arbitrary rotation preventing pin can be press-fitted. In this case, the relative position around the optical axis L between the annular main body portion 41 and the copying lens body 3 may be positioned by engaging the pin with the concave portion of the copying lens body 3.

[0019] The outer peripheral side surfaces of the annular fixing member 42 and the outer peripheral side surface of the close-up lens body 3 are subjected to knurling (details are not shown). Therefore, the annular fixing member 42 and the close-up lens body 3 are configured to be easily rotatable.

[0020] On the other hand, when the operation portion 233 of the locking member 23 is pushed into the inner diameter direction of the optical axis L against the elastic force by the elastic portion 232, the restricting portion 231 releases the locked state (movement restricting state) of the guided portion 321. After the locked state is released, the close-up lens body 3 is rotated counterclockwise, and the engaged state between the engaged portion 322 and the engaging portion 222c is released. When the guided portion 321 of the close-up lens body 3 moves to the opening portion 223, the close-up lens body 3 can be detached from the case 22.

[0021] The annular main body portion 41 has shaft portions 413 protruding in the left and right outer diameter directions symmetric with respect to the optical axis L. The shaft portions 413 are formed on a disk-shaped connecting portion 414 provided on the outer peripheral portion of the annular main body portion 41. The rod-shaped body 43 has the shaft portions 413 inserted through the opening portion 434 and is rotatably connected to the annular main body portion 41. The rod-shaped body 43 is configured to be arranged on both sides in the width direction of the camera (for example, left and right sides) when rotated. The rod-shaped body 43 of the present embodiment has an outward extending portion 432 bent so as to protrude outward from the base end portion 431 to the outside of the close-up lens body 3 (to the outer diameter side with respect to the optical axis L), and a forward extending portion 433 extending forward from the outward extending portion 432.

[0022] Further, the rod-shaped body 43 has a focus position indicator 44 of the close-up lens body 3. The base end portion 431 can set the rotation position so that the rod-shaped body 43 faces forward with respect to the annular main body portion 41, and the focus position indicator 44 is formed so as to be protrudable forward along the optical axis L of the close-up lens body 3.

[0023] The focus position indicators 44 are provided in a pair at both positions in the diameter direction in the lateral direction of the close-up lens body 3 (in the examples of FIGS. 1 and 2, the left and right directions orthogonal to the optical axis L). That is, the focus position indicators 44 are provided at two positions on the left and right of the close-up assisting device 4. Further, the focus position indicator 44 of the present embodiment is formed by the rod-shaped body 43, and the tip portion 44a is formed to the length of the focus position of the close-up lens body 3.

[0024] The imaging device 1 of the present embodiment constitutes a close-up lens unit with a focal length of 100 mm for the close-up lens body 3. The close-up lens body 3 of the imaging device 1 has a near point of 70 mm, a depth of field of 82 mm, and a far point of 152 mm. The tip portion of the focus position indicator 44 of the close-up assisting device 4 is configured to be arranged at the position of 70 mm which is the near point. Note that the present invention is not limited to the present embodiment, and for example, it may be configured to be provided near the center of the depth of field.

[0025] The base end portion 431 of the rod-shaped body 43 shown in the enlarged view of part C in FIG. 3 has a plurality of engaging portions 435 on the contact surface 431a with the annular main body portion 41. The engaging portion 435 is a substantially V-shaped groove portion, and is arranged radially around the opening portion 434. Further, the engaging portions 435 are arranged at angles different by 90 degrees around the opening portion 434.

[0026] On the other hand, as shown in the enlarged view of part D in FIG. 4, as a portion facing the contact surface provided with these engaging portions 435, the disk-shaped connecting portions 414 provided on the left and right of the annular main body portion 41 have a plurality of engaged portions 415 on the contact surface 414a with the rod-shaped body 43. The engaged portion 415 is a substantially cylindrical protrusion, and is arranged radially around the shaft portion 413. Further, the engaged portions 415 are arranged at angles different by 90 degrees around the shaft portion 413.

[0027] FIG. 6 is a diagram showing the engaged state S1 and the engaged state S2 of the rod-shaped body 43 of the close-up assisting device 4 in FIG. 1. The rod-shaped body 43 has a shaft portion 413 inserted through an opening 434, and further, an E-ring stopper 451, a flat washer 452, and a corrugated spring washer 453 are attached to the shaft portion 413 to prevent the rod-shaped body 43 from coming off the shaft portion 413. Further, the rod-shaped body 43 is pressed against the contact surface 414a side by the elastic force of the corrugated spring washer 453.

[0028] In the engaged state S1, the rod-shaped body 43 is engaged with the engaged portion 435 and the engaged portion 415 at four locations each, thereby restricting the rotation around the shaft portion 413. Therefore, the relative position and orientation of the rod-shaped body 43 with respect to the annular main body portion 41 are fixed.

[0029] On the other hand, when the rod-shaped body 43 is pulled in the direction away from the annular main body portion 41 or when a force is applied around the shaft portion 413 with a torque equal to or greater than a predetermined torque, the rod-shaped body 43 slightly moves in the direction away from the annular main body portion 41 against the elastic force of the corrugated spring washer 453, and the engagement between the engaged portion 435 and the engaged portion 415 is released to enter the disengaged state S2. As a result, the rod-shaped body 43 can rotate around the shaft portion 413. In this way, since the base end portion 431 of the rod-shaped body 43 is attached to the annular main body portion 41 so as to be rotatable along the vertical direction (or the front-rear direction) of the camera 2, the rod-shaped body 43 can be directed toward a subject in front of the camera 2 or folded.

[0030] The close-up assisting device 4 is used, for example, to confirm the focus position by directing the rod-shaped body 43 toward a subject during shooting. On the other hand, when shooting a moving subject such as a fleeing creature or when a rock, coral, or seaweed enters the composition (inside from the in-focus point or the lens side), the photographing device 1 can fold one or two rod-shaped bodies 43 horizontally and take a photograph. The rod-shaped body 43 can be folded instantaneously in the above-described situation during shooting. For example, it is folded horizontally by turning it one click (i.e., 90 degrees). Further, for example, the user can fold the rod-shaped body 43 by turning it two clicks for 180 degrees in the direction opposite to the subject when entering the water or moving.

[0031] Thus, since the close-up assisting device 4 of the present embodiment can be deformed so as to store the rod-shaped body 43 along the body of the camera 2 toward the camera 2 side opposite to the subject, it does not interfere with shooting. Also, since the rod-shaped body 43 can be instantaneously folded according to the situation during shooting, the range of options for the shooting method of macro shooting can be widened.

[0032] Also, the base end portion 431 of the rod-shaped body 43 has a mechanism that rotates with respect to the annular main body portion 41 and stops at equally spaced positions of 90 degrees. Therefore, the rod-shaped body 43 can be attached in two pieces so as to be vertically aligned in the vertical direction with respect to the center position in the left-right direction of the close-up lens body 3 by rotating the annular main body portion 41 by 90 degrees around the optical axis L with respect to the close-up lens body 3 and fixing it. Since the lens concave grooves are spaced at 90-degree intervals, the rod-shaped body 43 can be set horizontally even in shooting with a vertical position composition as well as a horizontal position composition.

[0033] Therefore, the close-up assisting device 4 of the present embodiment can enable macro shooting using an action camera of organisms in an environment such as rocks, corals, or seaweeds, for which shooting has not been easy heretofore. Thus, the close-up assisting device 4 can reduce the influence of the environment around the subject and can easily perform macro shooting.

[0034] (Embodiment 2) Next, the imaging device 1A of Embodiment 2 will be described. In the description of the imaging device 1A, for the same configurations as those of the imaging device 1 of Embodiment 1, the same reference numerals will be given and the description thereof will be omitted or simplified. FIG. 7 is a front perspective view of the imaging device 1A with the close-up assisting device 4A attached as viewed from above on the front side. Also, FIG. 8 is a front exploded perspective view of the imaging device 1A, and FIG. 9 is a rear exploded perspective view of the imaging device 1A.

[0035] The imaging device 1A includes an annular main body portion 41A instead of the annular main body portion 41. The annular main body portion 41A has a disk-shaped connecting portion 414 on the outer peripheral portion at one part in the radial direction perpendicular to the optical axis L. A rod-shaped body 43A is connected to the connecting portion 414 in a rotatable manner with respect to the annular main body portion 41A by inserting a shaft portion 413 through an opening portion 434. The rod-shaped body 43A is configured to be disposed in the width direction (for example, the upper side) of the camera 2 when rotated. The rod-shaped body 43A of the present embodiment includes an outward extending portion 432 bent so as to protrude outward from the base end portion 431 to the outside of the close-up lens body 3 (to the outer diameter side with respect to the optical axis L), a forward extending portion 436 extending so as to be inclined outward (to the outer diameter side with respect to the optical axis) and forward of the imaging device 1 of the close-up lens body 3, and a forward extending portion 433 extending forward from the outward extending portion 432.

[0036] The rod-shaped body 43A has a focus position indicator 44 of the close-up lens body 3. The focus position indicator 44 is formed so as to be able to protrude forward along the optical axis L of the close-up lens body 3 when the rotation position of the base end portion 431 is set to face forward with respect to the annular main body portion 41.

[0037] The focus position indicator 44 is provided at one part in the diameter direction of the annular main body portion 41A. That is, the focus position indicator 44 is provided at one location above the close-up assisting device 4. The focus position indicator 44 of the present embodiment is formed by the rod-shaped body 43, and the tip portion 44a is formed to have the length of the focus position of the close-up lens body 3.

[0038] The imaging device 1A of the present embodiment constitutes a close-up lens unit with a focal length of 165 mm of the close-up lens body 3. The close-up lens body 3 of the imaging device 1A has, for example, a depth of field of 250 mm, a near point of 100 mm, and a far point of 350 mm. Thus, the focus position indicator 44 of the close-up assisting device 4A is provided, for example, near the center of the depth of field.

[0039] The imaging device 1A of this embodiment has a longer focal length than the imaging device 1 of Embodiment 1, and the length of the rod-shaped body 43A is also long considering portability. Therefore, as described above, by providing one rod-shaped body 43A at the upper position and designing it to adjust the distance from above the subject during imaging, it is possible to easily perform macro imaging while simply configuring the close-up assisting device 4A.

[0040] Also, the lens groups of Embodiment 1 and Embodiment 2 are designed with a priority on taking a wide focusing range. Therefore, as exemplified above, since the depth of field is 82 mm or 250 mm and is relatively deep, the focus position indicator 44, which is an index of the rod-shaped body 43A, may have a shape (position) that points only to the near point. In this case, the user can easily focus and take a picture by placing the subject deeper when viewed from the imaging side of the imaging devices 1 and 1A.

[0041] (Embodiment 3) Next, the imaging device 1B of Embodiment 2 will be described. In the description of the imaging device 1B, the same components as those of the imaging device 1 of Embodiment 1 are denoted by the same reference numerals, and the description thereof will be omitted or simplified. FIG. 10 is a front perspective view of the imaging device 1A with the close-up assisting device 4B attached as viewed from above the front side. FIG. 11 is a front exploded perspective view of the imaging device 1B, and FIG. 12 is a rear exploded perspective view of the imaging device 1B.

[0042] The imaging device 1B has a rod-shaped body 43B that is rotatably connected to the annular main body 41 by inserting a shaft portion 413 through an opening 434 at a connecting portion 414 of the annular main body 41. The rod-shaped body 43B is configured to be disposed on both sides in the width direction (for example, left and right sides) of the camera 2 when rotated. The rod-shaped body 43B of this embodiment has a front extending portion 433 that extends forward from a base end portion 431.

[0043] Further, the rod-shaped body 43B has a focus position indicator 44B for the close-up lens body 3. When the rotation position of the base end portion 431 is set so that the focus position indicator 44B faces forward with respect to the annular main body portion 41, it is formed so as to be protrudably arranged forward along the optical axis L of the close-up lens body 3.

[0044] A pair of focus position indicators 44B are provided at both positions in the diameter direction in the lateral direction of the close-up lens body 3 (the left-right direction orthogonal to the optical axis L in the example of FIG. 10). That is, the focus position indicators 44B are provided at two positions, left and right, of the close-up assisting device 4B. Further, the focus position indicator 44B of the present embodiment is formed by the rod-shaped body 43B, and the tip portion 44Ba is formed to have the length of the far point of the focus position of the close-up lens body 3.

[0045] The focus position indicator 44B has a first protruding portion 44B1 that protrudes inward (toward the optical axis L side) of the close-up lens body 3 provided at the tip portion 44Ba of the rod-shaped body 43B, and a second protruding portion 44B2 provided at a portion closer to the close-up lens body 3 than the first protruding portion 44B1 (the rear side of the imaging device 1B). The first protruding portion 44B1 indicates the far point of the focus range of the close-up lens body 3, and the second protruding portion 44B2 is configured to indicate the near point of the focus range of the close-up lens body 3.

[0046] The imaging device 1B of the present embodiment constitutes a close-up lens unit with a focal length of 55 mm for the close-up lens body 3. The close-up lens body 3 of the imaging device 1B has, for example, a depth of field of 14 mm, a near point of 48 mm, and a far point of 62 mm.

[0047] Even when the depth of field of the imaging device 1B of the present embodiment is relatively shallow, by directing the rod-shaped body 43B having the first protruding portion 44B1 and the second protruding portion 44B2 toward the subject during imaging, the focus position can be confirmed. When the subject is located between the first protruding portion 44B2, which is the near point, and the second protruding portion 44B1, which is the far point, close-up shooting (macro shooting) can be easily performed. Therefore, in the present embodiment, since it is easier to grasp the position of the subject than in the case of the above-described embodiment, it is possible to perform close-up shooting underwater more easily.

[0048] As described above, the close-up shooting assist devices 4, 4A, and 4B are detachably attached and fixed to a close-up lens body 3 that is detachably attached to the front surface of the lens unit 221 of the camera, and an annular main body portion 41 that is attached to the outer peripheral surface portion of the close-up lens body 3 along the optical axis L of the close-up lens body 3, and the close-up lens body 3 provided on the annular main body portion 41 and capable of protruding forward along the optical axis of the close-up lens body 3. The configuration having the focus position indicators 44 and 44B of the close-up lens body 3 has been described.

[0049] By having the above-described configuration, for example, when the imaging devices 1, 1A, and 1B have a configuration with a shallow depth of field of view, when the subject may move, and when there are obstacles around the subject, etc., even if any one or more of these situations occur, it is possible to reduce the situation where focusing is performed visually or the range of selection of the shooting method (for example, the shooting angle) is narrowed. Therefore, it is possible to configure the close-up shooting assist devices 4, 4A, and 4B that reduce the influence of the environment around the subject and enable easy macro shooting.

[0050] Note that the annular main body portions 41 and 41A and the annular fixing member 42 are not limited to a circular annular closed shape, and may be formed in an annular shape with a part cut out, for example, a C-shaped annular shape.

[0051] In addition, although an example in which the rod-shaped bodies 43, 43A, and 43B are configured to be fixable at different rotation angles of 90 degrees has been shown, by changing the arrangement angles of the engaging portion 435 and the engaged portion 415, the fixable rotation angle may be configured to be more or less than four positions.

[0052] In addition, the engaging portions 222c and 435 and the engaged portions 322 and 415 may be any combination of a concave portion and a convex portion.

Explanation of Reference Numerals

[0053] 1, 1A, 1B Imaging devices 2 Camera 3 Extension Writing Lens Body 4, 4A, 4B Extension Writing Auxiliary Device 21 Camera Body 22 Case 23 Locking Member 23a Rotation Axis 24 Connecting Portion 31 Support 32 Lens Member 41, 41A Annular Main Body Portion 42 Annular Fixed Member 43, 43A, 43B Rod-shaped Body 44, 44B Focus Position Indicator 44B1 First Protrusion 44B2 Second Protrusion 44Ba Tip 44a Tip 221 Lens Portion 222 Guide Portion 222a Top Surface Guide Portion 222b Regulation Protrusion 222c Engagement Portion 222d Opening 223 Open Portion 231 Regulation Portion 232 Elastic Portion 233 Operation Portion 321 Guided Portion 321a, 321b End Portions 322 Engaged Portion 323, 324 Concave Portions 345 Engagement Portion 411 Outer Peripheral Surface 412 Screw Hole 413 Shaft Portion 414 Connection Portion 414a Contact Surface 415 Engaged Portion 421 Inner Peripheral Surface 431 Base End Portion 431a Contact Surface 432 Externally Extended Portion 433 Forward Extended Portion 434 Opening 435 Engagement Portion 436 Forward Extended Portion 451 E-ring stopper 452 Flat washer 453 Wave spring washer L Optical axis

Claims

1. A close-up assisting device detachably attached and fixed to a close-up lens body detachably attached to the front surface of a lens unit of a camera, comprising: an annular main body portion attached to an outer peripheral surface portion of the close-up lens body along an optical axis of the close-up lens body; and a focus position indicator of the close-up lens body provided on the annular main body portion and capable of protruding forward along the optical axis of the close-up lens body. The close-up assisting device is characterized by having the same.

2. The annular main body portion is detachably fixed to the close-up lens body by an annular fixing member. The close-up assisting device according to claim 1, characterized in that.

3. The focus position indicator is provided at one portion in a diametrical direction of the annular main body portion. The close-up assisting device according to claim 1, characterized in that.

4. The close-up assisting device according to claim 1, characterized in that a pair of the focus position indicators are provided at both diametrical portions in a lateral direction of the close-up lens body.

5. The focus position indicator is formed of a rod-shaped body. A base end portion thereof is attached to the annular main body portion so as to be rotatable along an up-and-down direction of the camera, and a tip end portion thereof is formed to have a length at a focus position of the close-up lens body. The close-up assisting device according to claim 1, characterized in that.

6. The focus position indicator has a first protruding portion protruding inward of the close-up lens body provided at a tip end portion of the rod-shaped body and a second protruding portion provided at a portion closer to the close-up lens body than the first protruding portion. The first protruding portion indicates a far point of a focus range of the close-up lens body, and the second protruding portion is configured to indicate a near point of the focus range of the close-up lens body. The close-up assisting device according to claim 5, characterized in that.

7. The rod-shaped body has an outward extending portion bent so as to protrude outward from the close-up lens body from the base end portion and a forward extending portion extending forward from the outward extending portion. The close-up assisting device according to claim 5, characterized in that.

8. The rod-shaped body is configured to be disposed on both sides in a width direction of the camera when rotated. The close-up assisting device according to claim 5, characterized in that.

Images