JP2005326630A - Interchangeable lens apparatus for single-lens reflex camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable photographing by easily setting photographing conditions for photographing a subject of an object distance, where setting of the photographic conditions by viewing through a viewfinder is difficult. <P>SOLUTION: The interchangeable lens apparatus comprises a lens barrel 3 mounted on a single-lens reflex camera and two pointers 4, extended in the optical axis direction from a subject side of the lens barrel and supported freely openable with each other. Photographing, by mounting the interchangeable lens apparatus on each camera of a film type and a digital type, is carried out by setting the photographing range corresponding to a wide or narrow imaging plane by the opening of the respective pointers and performing setting of the photographing distance from the camera to the subject, by placing the subject between the extension ends of the pointers. The photographing distance and the photographing range can be checked with the pointers as measures, without having to view through the viewfinder and the photographing, in the point-blank range where the probability of assuming an undue posture in order to set the photographing conditions by viewing the viewfinder is high can be easily performed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an interchangeable lens device for a single-lens reflex camera particularly suitable for photographing a subject at a close distance.

  Conventionally, in an interchangeable lens for a single-lens reflex camera whose main purpose is to photograph a subject at a close distance (for example, about 10 to 20 cm from a camera lens), setting of shooting conditions for the subject that is a subject to be photographed at such a close distance It was very difficult. Although there are various shooting conditions, it is important to mainly set the shooting field of view, the focus position, and the depth of field. With a single-lens reflex camera, the field of view and focus position can be set through the viewfinder.

  However, since the above prior art does not relate to a literature known invention, there is no prior art document information to be described.

  When shooting an object at a close distance as described above, it is very difficult to set various conditions by looking into the viewfinder if an easy posture cannot be taken. Especially for small flowers blooming close to the ground where there are many shooting opportunities, or flowers that you want to shoot at close range with your arms stretched over the fence, you can actually look into the finder and set the shooting conditions Nearly impossible. Even if it is possible to set shooting conditions with an unreasonable posture, the reality is that there are often inconveniences for the elderly and women.

  By solving such problems, you can easily set shooting conditions for shooting objects at close distances where it is difficult to set shooting conditions by looking through the viewfinder that is standard on SLR cameras. In order to realize that photographing is possible, in the present invention, a lens barrel mounted on a single-lens reflex camera to photograph a subject at a close distance, and an index of a photographing distance from the camera to the subject, At least two pointers supported by the lens barrel so as to open and close symmetrically with respect to the optical axis at a certain length, and to cope with the wide and narrow of the imaging plane of the camera depending on the opening of each pointer Shooting range setting means for setting the open / close positions of the pointers to indicate the shooting range of the subject.

  In particular, it is preferable that a lens whose position can be changed according to the shooting distance is provided on the lens barrel, and the length of the pointer can be adjusted according to the position of the lens. In addition, a small aperture for deepening the depth of field that becomes extremely shallow when the subject at a close distance is photographed on the lens barrel, and an opening that allows the photographing condition of the subject to be set by the viewfinder of the camera. It is preferable that an aperture mechanism capable of selectively setting the aperture is provided.

  As described above, according to the first aspect of the present invention, at least two pointers are provided on the lens barrel so as to serve as an index of the shooting distance with respect to a subject at a close distance, and the degree of opening is varied depending on whether the imaging plane of the camera is wide or narrow. The shooting distance and shooting range can be checked using the pointer as a guide without looking through the viewfinder, and the shooting conditions can be set by looking through the viewfinder. It is easy to shoot at a close range, which is likely to be an unreasonable posture, and the opening of the pointer according to the difference in the imaging plane between the film camera and the digital camera Therefore, it is possible to easily cope with a single-lens reflex camera of a different method.

  In particular, the lens position can be changed according to the shooting distance, and the length of the pointer can be adjusted according to the lens position, so that macro shooting at different distances can be performed, and each It can be done easily. In addition, when shooting a close-up subject, you can selectively set a small aperture and an open aperture that allow you to shoot with a deep depth of field, so you can look into the viewfinder with that small aperture. When the shooting conditions cannot be set due to darkness, not only can the problem be solved by setting an open aperture, but also shooting intended for a shallow depth of field by the open aperture can be performed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall perspective view showing a photographing procedure for a subject at a close distance (for example, about 10 to 20 cm from a camera lens) by a single-lens reflex camera to which the present invention is applied. An interchangeable lens device 1 for a single-lens reflex camera according to the present invention includes a lens barrel 3 that is mounted on a single-lens reflex camera 2 in the same manner (for example, bayonet type) as shown in FIG. For example, a pair of left and right hands 4 attached integrally to the front end (opening end of the subject side).

  As shown in FIG. 2, a support ring 5 is fixed to the tip of the lens barrel 3, and a pair of support rods 6 that expand and extend from the radial symmetry position are integrally provided on the support ring 5. It has been. Both support rods 6 in the illustrated example are provided so as to be positioned in the left-right direction of the single-lens reflex camera 2 with the lens barrel 3 mounted on the single-lens reflex camera 2. A pointer rod 7 is provided on the inner side with respect to the expanding direction of the support rod 6. One end of the pointer rod 7 is pivotally supported by the support ring 5 so as to be tiltable in the expanding direction of the both support rods 6. A cylindrical slide shaft support portion 8 is formed at the other end of the pointer rod 7, and an outward ear piece 9 extending over the support rod 6 and extending outward in the expanding direction is provided near the other end of the pointer rod 7. It is integrally formed.

  A shaft support hole 8a penetrating in the axial direction of the pointer rod 7 is formed in the slide shaft support portion 8. The intermediate portion of the bar-shaped pointer 4 slides in the axial direction (arrow A in FIG. 2) by the shaft support hole 8a. It is supported freely. FIG. 2 shows the state in which the pointer 4 is retracted most. At the end of the pointer 4 in the protruding direction, a columnar neck portion 4a having a diameter larger than that of the rod-shaped shaft portion and a rounded head portion 4b are provided. The slide shaft support portion 8 is formed with a large-diameter hole having substantially the same diameter for receiving a part of the neck portion 4a coaxially with the shaft support portion 8a. In the state where the neck portion 4a enters the large-diameter hole as shown in FIG. The two are frictionally engaged and the neck 4a is held by the slide shaft support 8, whereby the pointer 4 is positioned in a short state.

  An outward flange-like stopper 4c is provided at an axial end opposite to the head 4b of the pointer 4. For example, the pointer 4 can be pulled out by grasping the head 4b of the pointer 4, and the stopper 4c comes into contact with the slide shaft support portion 8 so that the pointer 4 is pulled out to the maximum (solid line in FIG. 3).

  Further, in the illustrated example, an outward projecting portion 6 a extending along the outward ear piece 9 is integrally formed at a position corresponding to the outward ear piece 9 in the support bar 6 in the illustrated example. The outward projection 6a is provided with a guide pin 6b that projects toward the outward ear piece 9. The outward ear piece 9 is formed with an arc-shaped slot 9a extending in the extending direction, and the guide pin 6b penetrates the slot 9a. In this way, the slot 9a is guided by the guide pin 6b, and the pointer rod 7 can be tilted in the direction indicated by the arrow B shown in FIG. 2 by the length of the slot 9a. Thereby, both hands 4 open and close symmetrically with respect to the optical axis CL.

  The state shown in FIG.1 and FIG.2 has shown the case where this interchangeable lens apparatus is applied to a film type single-lens reflex camera. In this case, both pointer rods 7 are displaced to the outermost position by the slot 9a. On the other hand, in the case of a digital single-lens reflex camera, since the imaging surface of the CCD is narrower than the film, both pointer rods 7 are displaced to the innermost position by the slot 9a according to the width. . For example, taking the super macro shown in FIG. 3 as an example, in the state where both pointer rods 7 are spread outward in accordance with the film type (solid line), the shooting range is Z1 in the figure, and both pointer rods 7 are matched with the digital type. In the state in which is narrowed inward (imaginary line), the photographing range is set narrower than the film type as indicated by Z2 in the figure. In this manner, it is possible to suitably adjust the imaging planes of the film camera and the digital camera.

  In the illustrated example, the shooting distance from the lens of the camera 2 of the subject at a close distance is described as 10 to 20 cm. As shown in FIGS. 1 and 2, the state in which the pointer 4 is short corresponds to an imaging distance L1 of 10 cm (referred to as an ultra macro), and the state in which the pointer 4 is long as shown in FIG. Corresponding to super macro). In both cases of the ultra macro and the super macro, the subject (for example, the flower S in FIG. 1) is positioned between the tips (heads 4b) of the pointers 4 and photographed.

  In order to correspond to a plurality of shooting distances as described above, as shown in FIG. 4, the lens barrel 3 is provided with a lens 11 that is movable in the optical axis direction. The structure for moving the lens 11 in the optical axis direction may be one using a general cam cylinder in a camera, and is not a special structure.

  For example, the lens holder 12 that holds the lens 11 is coaxially received inside the lens barrel 3, and the protruding end portion of the cam pin 12 a protruding from the lens holder 12 is axially connected to the small diameter portion of the lens barrel 3. It penetrates the slot 3a provided so as to extend. A cam cylinder 13 is fitted to the small-diameter portion of the lens barrel 3 so as to be rotatable in the circumferential direction. On the outer periphery of the cam cylinder 13, for example, a pin-coupled operation ring 14 is externally provided. . The cam cylinder 13 is provided with a cam groove 13 a extending obliquely with respect to the axis, and the protruding end portion of the cam pin 12 a protrudes into the cam groove 13. For example, a rubber grip for facilitating the manual operation is provided on the outer peripheral surface of the operation ring 14.

  In the illustrated example, when the operation ring 14 is turned, the cam pin 12a restricted to move only in the axial direction by the slot 12a is guided by the cam groove 13a and moved in the axial direction. Thereby, the lens holder 12, that is, the lens 11 moves in the optical axis direction, and the image of the subject S can be formed on the film surface F according to the shooting distance.

  Further, in this interchangeable lens apparatus, as shown in FIG. 4, a diaphragm mechanism is provided on the end surface of the lens holder 12 on the camera side. As shown in FIG. 5, the diaphragm mechanism is configured using a plurality of diaphragm blades 15 that are generally used as a diaphragm for a camera. Each diaphragm blade 15 is linked to an annular body 16 rotatably provided on the lens holder 12, and each diaphragm is interlocked with the rotational angle of the annular body 16 as shown in FIGS. 5 (a) and 5 (b). The overlapping degree of the blades 15 changes, and the diameter of the diaphragm 17 formed of an opening formed in the center by each diaphragm blade 15 changes in size.

  In the rotating structure of the annular body 16 in the illustrated example, the push button 18 provided in the barrel 3 so as to be displaceable in the radial direction, the inwardly entering end portion of the push button 18 and the annular body 16 are provided. It consists of a link device 19 provided between them. In the state of FIG. 5A, the diaphragm 17 is set to a small diaphragm (for example, F value 32), and the push button 18 is moved in the direction of the arrow C as shown in FIG. It is made to be in an open state by pushing. In the illustrated example, a return spring 20 is connected to the annular body 16 so that the state shown in FIG. 5A can be automatically returned by releasing the pressing force of the push button 18.

  In shooting using the present interchangeable lens apparatus configured as described above, the length of the pointer 4 is determined according to the shooting distance, and both are set according to the difference in the image plane between the film camera and the digital camera. The opening degree of the pointer 4 is determined, and the subject S is positioned between the tips of the two pointers 4 set in this manner, and photographing is performed. Specifically, as shown in FIGS. 1 and 2, when the pointer 4 is retracted (most contracted), an ultra macro setting for photographing the subject S at a distance of about 10 cm from the lens 11 is set. On the other hand, as shown by the solid line in FIG. 3, when the pointer 4 is pulled out (most extended), the super macro is set so as to photograph the subject S at a distance of about 20 cm from the lens 11.

  In each macro shooting, it is necessary to move the lens 11 in accordance with the shooting distance. As a mark for this purpose, for example, an index is indicated at an arbitrary position of the operation ring 14, and the rotation position of the operation ring 14 corresponding to the position of the lens 11. In accordance with the above, it is preferable to write “U” indicating an ultra macro and “S” indicating a super macro on the outer peripheral surface of the lens barrel 3. For example, when the index is set to U, it indicates that the lens 11 is in focus at the ultra macro position, that is, a position approximately 10 cm ahead of the lens. In this case, by shortening the pointer 4, The tip indicates the shooting range and focus position at that time. If the index is set to S, it indicates that the lens 11 is in focus at a super macro position, that is, a position 20 cm ahead of the lens 11. In this case, if the tip of the pointer 4 is extended to the longest, the tip of the lens 11 is This indicates the super macro shooting range and focus position.

  In addition, both pointer rods 7 are openable and closable in a direction in which they approach and move away from each other (left and right in the illustrated example), and both pointers 4 can be opened and closed. The large opening state shown in FIGS. 1 and 2 is the opening corresponding to the size of the imaging plane in the film camera, and the small opening state shown in the imaginary line in FIG. 3 is the imaging plane in the digital camera. Is the opening corresponding to the size of.

  In shooting at a close distance (10 to 20 cm) as described above, the depth of field becomes extremely shallow in shooting using the brightness of the lens during normal shooting, and a desirable result cannot be obtained. Therefore, the aperture of the taking lens is extremely small so that it cannot be used in normal shooting, that is, as described above, a deep depth of field is obtained as a dark lens stop having an F value of 32 or higher. Further, when the light quantity is extremely short due to the influence, forced light emission is selected as the photographing condition of the camera 2 and the light emission is supplemented by the light emission.

  In the standard shooting procedure using this interchangeable lens device, as described above, in the case of a single-lens reflex camera in which the viewfinder is configured by light that has passed through the lens, the image of the viewfinder also becomes dark, Great inconvenience occurs in visual recognition such as determination of the field of view and confirmation of focus. If this interchangeable lens apparatus is used, the position of the subject S can be easily determined without looking into the viewfinder, but it is also possible to handle the case where it is desired to set the shooting conditions through the viewfinder. In that case, the push button 18 is pressed to open the diaphragm 17. As a result, the field of view and the focus position are set in a sufficiently bright viewfinder, and if the pressing force of the push button 18 is released after the setting, the aperture automatically returns to a small aperture, and even for a subject S at a close distance. Deep depth photography is possible.

  Furthermore, sometimes you want to focus on a point and deliberately blur the front and back to emphasize the focus of that part. In that case, press the push button 18 to open the aperture and shoot as it is. It is also possible to emphasize and photograph the subject S at a desired shallow depth.

  In the illustrated example, a pair of left and right hands 4 are provided. However, the number of hands 4 is not limited to two, and it is only necessary that the hands 4 be opened and closed symmetrically. There may be three or more numbers. Alternatively, the diaphragm 17 may be simply fixed to a small diaphragm. Of course, by making the open aperture selectable as in the illustrated example, the usability is improved as described above. Further, the length of the pointer 4 may be fixed. Also in this case, as described above, various lengths of photographing can be performed by making the length adjustable and the lens 11 movable. Further, by finely describing the scale indicating the moving position of the lens 11 and also indicating the scale indicating the extended position of the pointer 44 corresponding thereto, not only the two positions of the ultra macro and the super macro in the illustrated example, but also any other arbitrary Macro shooting for the position of can be performed.

It is a whole perspective view which shows the imaging | photography point with respect to the object of the short distance by the single-lens reflex camera to which this invention was applied. It is a principal part fracture | rupture top view of the interchangeable lens apparatus based on this invention. It is a top view which shows a super macro imaging | photography state. It is sectional drawing which shows the lens-barrel part of the interchangeable lens apparatus based on this invention. (A) is a figure which shows a small aperture state, (b) is a figure which shows an open aperture state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Interchangeable lens apparatus for single-lens reflex cameras 3 Lens tube 4 Pointer 7 Pointer rod 11 Lens 12 Lens holder 13 Cam cylinder 14 Operation ring 15 Diaphragm blade 17 Diaphragm 18 Push button 19 Link device

Claims (3)

  A lens barrel mounted on a single-lens reflex camera to photograph a subject at a close distance, and the mirror so as to open and close symmetrically with respect to the optical axis at a length that is an index of a photographing distance from the camera to the subject. At least two pointers supported by the cylinder, and the opening / closing positions of the pointers to indicate the shooting range of the subject corresponding to the difference in the imaging plane of the camera according to the opening of each pointer An interchangeable lens device for a single-lens reflex camera.   The single lens according to claim 1, wherein a lens whose position is changed according to the shooting distance is provided in the lens barrel, and the length of the pointer can be adjusted according to the position of the lens. Interchangeable lens device for reflex camera.   A small aperture for deepening the depth of field that becomes extremely shallow when shooting the subject at a close distance in the lens barrel, and an open aperture that allows the shooting conditions of the subject to be set by the camera finder. An interchangeable lens device for a single-lens reflex camera according to claim 1 or 2, wherein an aperture mechanism capable of selectively setting the aperture is provided.

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