JP3728054B2 - Viewfinder frame adjustment mechanism and optical member position adjustment mechanism - Google Patents

Description

[0001]
【Technical field】
The present invention relates to a finder field frame adjustment mechanism and an optical member position adjustment mechanism.
[0002]
[Prior art and its problems]
In compact cameras and digital cameras where the imaging optical system and viewfinder optical system are provided independently, the shooting range of the imaging optical system, that is, the observation range of the viewfinder is wider than the actual screen of film or CCD, and shooting is performed in the viewfinder optical system. A field frame member for displaying the range is often provided. An example of such a viewfinder device is shown in FIG. In the finder block 80, a field frame 82 is formed on the eyepiece 81. The eyepiece 81 includes a pair of positioning projections 83 having a substantially rectangular shape on the side, and is supported by the camera body by fitting the pair of positioning projections 83 into a pair of slits 85 formed in the finder case 84. In the support state, tweezers are inserted from the outside of the slit 85 and held with the positioning projection 83 interposed therebetween, and the positioning projection 83 is slid within the slit 85 to move the position of the eyepiece lens 81, thereby moving the field frame 82 within the imaging range. Make adjustments to match. That is, when adjusting the position of the eyepiece lens 81, it is necessary to move the lens while holding the positioning protrusion 83 between them, but it is difficult to hold the positioning protrusion 83 in a narrow slit, and the eyepiece lens 81 is accurately moved. It is difficult to let Another problem is that the holding by the tweezers tends to shift again when the eyepiece 81 is adhered to the finder case 84 after the field frame adjustment. As described above, the conventional field frame adjustment is poor in workability, and in particular, in recent years when the size of the camera is reduced and the unit of the finder apparatus is advanced, the demand for a field frame adjustment mechanism that can be easily adjusted with a simple and inexpensive configuration has increased. Yes.
[0003]
The above problems are not limited to the adjustment of the position of the viewfinder frame, but are common to the adjustment of the position of an optical member such as a lens. In other words, when the lens constituting the optical system is moved in the plane direction perpendicular to the optical axis, adjusting the lens position while sandwiching the protrusion using tweezers or the like as described above results in poor workability.
[0004]
OBJECT OF THE INVENTION
SUMMARY OF THE INVENTION An object of the present invention is to obtain a viewfinder frame adjustment mechanism of a finder that can be easily adjusted with a simple configuration. Another object of the present invention is to obtain an optical member position adjusting mechanism that can be easily adjusted with a simple configuration.
[0005]
SUMMARY OF THE INVENTION
The finder field frame adjustment mechanism according to the present invention includes a pair of slits formed in the finder holding frame and extending in parallel in a plane perpendicular to the optical axis of the finder; a pair slidably fitted in the pair of slits. And a field frame member having a field frame supported so as to be movable in a plane parallel to the pair of slits through the positioning projections of the adjustment projection, and an adjustment operation tool inserted from the pair of slits during assembly adjustment In the finder for adjusting the position of the field frame member by engaging the positioning projections with the positioning projections, the pair of positioning projections and the pair of adjustment operating tools are provided with concave and convex shapes that engage with each other. According to this configuration, the visual field frame member can be held in a plane orthogonal to the optical axis by the pushing force in the insertion direction of the adjustment operation tool, and the adjustment work is easily performed.
[0006]
For example, the pair of positioning projections includes a concave groove having a pair of opposing walls that narrow the opposing interval toward the center side of the field frame member, and the pair of adjustment operation tools are a pair of contact walls that are in contact with the opposing walls in the concave groove. A configuration having a tapered surface is possible. This configuration is excellent in retention because the tapered portion that is inclined with respect to the insertion direction of the operating tool is engaged.
[0007]
Further, the pair of positioning projections has a semicircular convex portion that protrudes toward the slit, and the end portions of the pair of adjustment operation tools have a semicircular concave portion that engages with the semicircular convex portion. Since the circular portion engages, rattling is unlikely to occur.
[0008]
The pair of positioning protrusions has a trapezoidal convex shape having a pair of inclined surfaces that are widened toward the center side of the field frame member, and the end portions of the pair of adjusting operation tools engage with the pair of inclined surfaces. It can also be concave. In this configuration, the shape of the engaging portion is simple and can be processed at low cost.
[0009]
In the above, it is preferable that the pair of adjustment operating tools is supported and guided in a linear movement direction that engages and disengages with the pair of positioning protrusions. Furthermore, it is preferable that the pair of adjustment operation tools is urged with a uniform spring force in a direction to engage with the pair of positioning protrusions. Thereby, since the visual field frame member can be held at a fixed position in a state where the hand is released, the adjustment operation is facilitated.
[0010]
The present invention also relates to a position adjusting mechanism for the optical member, and a pair of slits formed in a support frame of the optical member and extending in parallel in a plane perpendicular to the optical axis of the finder; slidable in the pair of slits And an optical member supported so as to be movable in a plane parallel to the pair of slits via a pair of positioning projections to be fitted, and positioning an adjustment operation tool inserted into the pair of slits during assembly adjustment In the optical member position adjustment mechanism that moves the optical member by engaging the protrusion and adjusts the position thereof, the pair of positioning protrusions and the pair of adjustment operating tools are provided with concave and convex shapes that engage with each other. Features.
[0011]
In the finder field frame adjustment mechanism and optical member position adjustment mechanism described above, the field frame member or optical member is held at the adjusted position by fixing the pair of positioning protrusions to the frame member after positioning. Can do.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
A finder block 10 shown in FIGS. 1 to 3 is a direct-view type finder for a digital camera, and has a U-shaped finder lens holding frame 11 having an open top and an upper cover that covers the top of the finder lens holding frame 11. 12. In the finder lens holding frame 11, the inside between the opposing wall portions 13a and 13b is a lens storage space 14 in which a finder optical system is incorporated. Two fixing pins 15 are projected from the upper end surfaces of the opposing wall portions 13a and 13b (four in total), and two mounting grooves 16 are provided facing the upper end surfaces of the opposing wall portions 13a and 13b. Each is formed (four in total). A first lens holding groove 17 and a second lens holding groove 18 that form a pair from the object side are formed inside the opposing wall portions 13a and 13b, and the opposing wall portions 13a and 13b are notched on the eyepiece side. A pair of slits 19 is formed.
[0013]
The upper lid 12 is provided with four fixing holes 21 corresponding to the fixing pins 15 of the finder lens holding frame 11 and four mounting arm portions 22 corresponding to the mounting grooves 16. By engaging the fixing hole 21 with the fixing pin 15 and the attachment arm portion 22 with the attachment groove 16, the finder lens holding frame 11 and the upper lid 12 become a box-like body having openings on the object side and the eyepiece side. In FIG. 2, only two attachment arm portions 22 on the front side are shown.
[0014]
The finder optical system held by the finder lens holding frame 11 and the upper lid 12 is composed of a first lens 23, a second lens 24, and an eyepiece lens 25 in this order from the objective side. The first lens 23 has a pair of side projections 26 on both side surfaces, and an upper support projection 28a and a lower support projection 28b are provided on the upper and lower portions, respectively. The second lens 24 has a pair of side projections 27 projecting from both sides, and an upper support projection 29a and a lower support projection 29b projecting from the upper and lower portions. In the drawing, only one of the side projections 26 of the first lens 23 on the front side is shown.
[0015]
The eyepiece lens 25 (field frame member) has a field frame 30 deposited on the front surface. The field frame 30 is set to a size corresponding to the photographing screen when the eyepiece 25 is placed at the position of the slit 19 in the finder optical system. In the finder of the present embodiment, the second surface of the front first lens 23 (concave lens) is a half mirror, and the reflected light image type in which the field frame 30 provided on the eyepiece lens 25 (convex lens) is floated by the reflected light. Finder.
[0016]
The lateral width W1 of the eyepiece 25 main body is slightly narrower than the inner space W2 between the opposing wall portions 13a and 13b near the slit 19 (see FIGS. 1 and 3). A pair of positioning projections 33 project from both side portions of the eyepiece 25. The thickness of the positioning projection 33 in the optical axis direction is formed so as to be slidable within the slit 19 formed in the finder lens holding frame 11. On the other hand, the lateral protrusion of the positioning projection 33 is such that the eyepiece lens 25 is not exposed outward from the slit 19 when the eyepiece 25 moves between the opposing wall portions 13a, 13 in the lateral width direction. The positioning projection 33 includes an engaging concave groove 33 a cut out from the end surface facing the slit 19 toward the center of the eyepiece lens 25. Each engaging groove 33a has a pair of opposing walls 33b provided with an inclination that narrows the facing distance from the opening end face of the groove toward the bottom, and a bottom surface 33c between the opposing walls 33b (FIG. 9). An upper support protrusion 31 and a lower support protrusion 32 are formed on the upper and lower portions of the eyepiece lens 25.
In each of the lenses described above, the protruding portion is integrally formed in the lens manufacturing process.
[0017]
The finder block 10 is assembled as follows. First, the side projection 26 is inserted into the first lens holding groove 17 from the upper side (opening end face side) of the finder lens holding frame 11, and the first lens 23 is mounted in the lens housing space 14. At this time, the lower support protrusion 28b engages with the support hole 14a formed in the bottom of the lens storage space 14. Similarly, the side projection 27 is fitted into the second lens holding groove 18 to mount the second lens 24 in the lens storage space 14. At this time, the lower support protrusion 29b is engaged with a support hole (not shown) formed in the bottom of the lens storage space 14. The widths of the first lens 23 and the second lens 24 are substantially equal to the inner space between the opposing wall portions 13a and 13b at the mounting locations, and the side protrusions 26 and 27 are fitted in the lens holding grooves 17 and 18, respectively. It will be worn out at the moment. After the mounting, the first lens 23 and the second lens 24 are fixed to the finder lens holding frame 11 with an adhesive.
[0018]
The eyepiece 25 inserts a pair of positioning projections 33 into the pair of slits 19 from the upper side (opening side) of the finder lens holding frame 11. The finder lens holding frame 11 has a support hole (not shown) for receiving the lower support protrusion 32, and the eyepiece 25 is supported by the pair of positioning protrusions 33 fitted into the slit 19. At this time, the positioning protrusion 33 does not protrude from the slit 19 as described above.
[0019]
Finally, the upper lid 12 is attached to the finder lens holding frame 11 by engaging the fixing hole 21 with the fixing pin 15 and the attachment arm portion 22 with the attachment groove 16. At this time, the upper support protrusion 28 a of the first lens 23 is engaged with the engagement hole 12 a of the upper lid 12. Similarly, the upper support protrusion 29 a of the second lens 24 and the upper support protrusion 31 of the eyepiece lens 25 are respectively engaged with engagement holes (not shown) formed in the upper lid 12.
[0020]
The position of each lens in the optical axis direction is determined in advance by a predetermined interval by the holding grooves 17 and 18 and the slit 19 on the finder lens holding frame 11 side. Further, the positions of the first lens 23 and the second lens 24 in the plane orthogonal to the optical axis are also fixed. On the other hand, since the lateral W1 width of the eyepiece lens 25 is smaller than the interval W2 between the opposing wall portions 13a and 13b, it can move a little between the opposing wall portions 13a and 13b (lateral direction). Further, the height of the eyepiece 25 can be moved a little in the vertical direction within the frame-shaped portion surrounded by the finder lens holding frame 11 and the upper lid 12, and the support protrusions 31 and 32 are formed on the upper lid 12 and the finder lens holding frame 11. It is in a loose fitting state with respect to the support hole (not shown). Therefore, the eyepiece 25 can be moved in the surface direction orthogonal to the optical axis by sliding the positioning protrusion 33 in the slit 19.
[0021]
As shown in FIGS. 4 and 5, the assembled finder block 10 is attached to the imaging lens support 35. The imaging lens support 35 includes an imaging optical system 36, and the finder block 10 is fixed to become an optical unit 40 of the camera. In the optical unit 40, the optical axis of the finder optical system and the optical axis of the imaging optical system 36 are parallel.
[0022]
The viewfinder frame adjustment operation is performed by attaching the optical unit 40 to the adjustment device 41 shown in FIGS. The imaging lens support 35 has holding holes 37 and 38 on the side surface. The adjusting device 41 includes a clamp part 41 a having a pin that fits into the holding hole 37 and a clamp part 41 b having a pin that fits into the holding hole 38. The optical unit 40 can be fixed to the adjustment device 41 by inserting the pins of the clamp portions 41 a and 41 b into the holding holes 37 and 38 of the imaging lens support 35 and tightening the clamp screws.
[0023]
Above the support position of the optical unit 40, a two-way movable unit 42 that is movable in the x and y directions in FIG. An x-axis adjusting screw 43 is fixed to a fixture 46a of a first movement support member 46 (a member shown by hatching in the lower right direction in FIGS. 6 to 8) constituting the two-way movable unit 42. The first movement support member 46 is supported so as to be movable in the x direction with respect to the second movement support member 47 (a member indicated by hatching rising to the right in FIGS. 6 to 8). A y-axis adjusting screw 44 is fixed to the fixture 47a of the second moving support member 47, and the second moving support member 47 is supported so as to be movable in the y direction with respect to the main body of the adjusting device 41. . The x-axis adjusting screw 43 and the y-axis adjusting screw 44 are push / pull screws for a micrometer, and the advance / retreat shafts 43a and 44a advance and retract when rotated. The end portions of the advance / retreat shaft 43a and the advance / retreat shaft 44a are fixed to supports 48 and 49, respectively. Accordingly, when the y-axis adjusting screw 44 is rotated forward and backward, the second moving support member 47 is moved in the y direction, and when the x-axis adjusting screw 43 is rotated forward and reverse, the second moving support member 47 is supported by the second moving support member 47. 1 The moving support member 46 is moved in the x direction.
[0024]
A through hole 46b (FIG. 8) is formed in the first movement support member 46, and a pair of shaft guide plates 45 are fixed to the side portion thereof. A shaft 50 is supported so as to be slidable in the vertical direction of FIGS. 6 and 7 with respect to the through hole 46b, and a cam receiving plate 50a at the upper end of the shaft 50 is guided between the pair of shaft guide plates 45. Yes. A compression spring 52 is disposed between the cam receiving plate 50 a and the first movement support member 46. The position of the cam receiving plate 50a when the compression spring 52 is in a free state is above the position shown in FIG. A lowering operation cam member 51 is pivotally supported by a shaft 51a on the shaft guide plate 45, and when the lowering operation cam member 51 is rotated from the position indicated by a two-dot chain line in FIG. The lower end portion of 51 is brought into contact with the cam receiving plate 50a, and the shaft 50 is slid downward while compressing the compression spring 52.
[0025]
An operating tool support frame 53 is supported at the lower end of the shaft 50. As shown in FIG. 7, the operation tool support frame 53 has a U-shaped cross-sectional shape with a concave space 53a facing downward, and a pair of support arm portions 53b opposed to each other with the concave space 53a interposed therebetween, A pair of guide members 54 each having a through hole 54a whose axis is orthogonal to the sliding direction of the shaft 50 is fixed. The axes of the pair of through holes 54a are on a straight line, and a pair of slide bodies 55 are slidably supported therein. Each slide body 55 is provided with a gripping knob 56 at an end portion protruding outward from the support arm portion 53b. On the other hand, an adjustment operation tool 57 is provided at the end of each slide body 55 on the side facing the concave space 53a. The pair of adjustment operating tools 57 is a plate-like member having a tapered shape as viewed from the front, and the distal end portion is a distal circular portion 57a having no corners, and the distal circular portion 57a faces the concave space 53a. Yes. Further, as shown in FIG. 9, the thickness of the adjustment operation tool 57 is smaller than the thickness of the positioning projection 33 of the eyepiece lens 25, and can be inserted into the slit 19 of the finder lens holding frame 11.
[0026]
A compression spring 58 that urges the slide body 55 in a direction in which the adjustment operation tool 57 protrudes into the concave space 53a is disposed inside the guide member 54. The pair of compression springs 58 have an equal spring force, and in the free state, the pair of slide bodies 55 are held at positions where the pair of adjusting operation tools 57 protrudes the same amount into the concave space 53a (see FIG. 7). From this position, when the gripping knob 56 is pulled to a certain amount in the direction of arrow A in the figure and is slightly rotated, the slide body is moved to a position where the adjustment operation tool 57 is accommodated in the through hole of the guide member 54 by a known stopper mechanism. 55 is locked. This locking is released when the grip knob 56 is slightly rotated, and the adjustment operation tool 57 is protruded into the concave space 53a by the urging force of the compression spring 58.
[0027]
The adjusting device 41 further includes a TV camera 59 for finder observation. The television camera 59 is fixed so that the imaging lens and the image sensor are positioned on the optical axis extension of the finder optical system in a state where the optical unit 40 is fixed to the adjusting device 41. That is, the television camera 59 is in a state of observing a finder image, and the image is displayed on a monitor (not shown). On the other hand, the image of the imaging optical system 36 is also displayed on another monitor. The imaging lens of the television camera 59 has a magnification at which the monitor image substantially matches the monitor image of the imaging optical system.
[0028]
The adjustment of the field frame is performed as follows using the adjustment device 41 described above. First, before fixing the optical unit 40, the operation tool support frame 53 is raised by tilting the lowering operation cam member 51 to the position of the two-dot chain line in FIG. Further, the gripping knob 56 is pulled in the A direction (FIG. 7) to hook the stopper, and the pair of adjustment operating tools 57 are locked in a state of being housed in the guide member 54. In this state, the optical unit 40 is fixed to the adjusting device 41. Subsequently, the lowering operation cam member 51 is rotated to the solid line position in FIG. 7 to push down the operation tool support frame 53. When the operation tool support frame 53 is pushed down, the concave space 53a is positioned to surround the finder block 10 with a predetermined interval (see FIG. 7). At this time, in a plane orthogonal to the optical axis of the finder optical system, the end portions of the pair of adjustment operating tools 57 are opposed to the engaging concave grooves 33a of the pair of positioning projections 33 provided on the eyepiece lens 25. . Further, as shown in FIG. 6, in the optical axis direction of the finder optical system, the slide body 55 (adjustment operation tool 57) is at a position corresponding to the slit 19 of the finder lens holding frame 11.
[0029]
Here, when the grip knob 56 is rotated to release the lock, the slide body 55 is moved by the restoring force of the compression spring 58, and the adjustment operating tool 57 advances into the concave space 53a. Since the pair of adjustment operating tools 57 are at positions corresponding to the slits 19 and are thinner than the slits 19, the ends thereof enter the slits 19 and engage with the engaging grooves 33 a of the pair of positioning projections 33. Match. Specifically, the tapered surface near the tip of the adjustment operation tool 57 abuts along the inclined opposing wall 33b, and the apex of the tip circular portion 57a contacts the bottom surface 33c. Since the pair of adjustment operating tools 57 suppress the positioning protrusions 33 from both sides by the force of the compression spring 58, the eyepiece lens 25 sandwiched between them is held at a fixed position in the forward / backward direction of the slide body 55. At the same time, since the adjustment operating tool 57 is fitted in the engaging concave groove 33a, the eyepiece lens 25 is held at a fixed position even in the direction orthogonal to the forward and backward movement of the slide body 55.
[0030]
In this state, the monitor image of the finder optical system by the TV camera 59 and the monitor image of the imaging optical system 36 are compared, and it is checked whether the field frame 30 of the eyepiece 25 matches the imaging range of the imaging optical system 36. As described above, the eyepiece 25 is held at a fixed position by the adjustment operation tool 57, but the positioning projection 33 is not fixed to the slit 19, so that it is constant within the plane perpendicular to the optical axis in the finder block 10. Can be moved. For example, when the field frame 30 is shifted downward from a predetermined position, the y-axis adjusting screw 44 is rotated in a direction in which the two-way movable unit 42 (second movement support member 47) is raised. Then, while the optical unit 40 is fixed to the adjustment device 41, the eyepiece lens 25 supported by the two-way movable unit 42 is movable, and therefore the adjustment unit 57 that engages the positioning protrusion 33 is used. Thus, the eyepiece 25 is moved relative to the finder lens holding frame 11 upward. Thereby, the vertical adjustment of the visual field frame 30 is performed. The rotation operation of the y-axis adjustment screw 44 is performed until the field frame 30 matches the vertical width of the imaging range of the imaging optical system 36.
[0031]
Similarly, when the field frame 30 is shifted to the left or right of the shooting screen, the x-axis adjusting screw 43 is rotated in a desired direction. Then, the first movement support member 46 is moved in the x direction in FIG. 7, and the eyepiece lens 25 is moved in the lateral width direction between the opposing wall portions 13 a and 13 b of the finder lens holding frame 11 via the adjustment operation tool 57. The The two monitor screens are compared, and the horizontal position of the field frame 30 is adjusted by rotating the x-axis adjusting screw 43 until the field frame 30 matches the left-right width of the imaging range of the imaging optical system 36. When the field frame 30 is displaced in the vertical and horizontal directions, the position adjustment is performed by combining the rotation operations of the x-axis adjusting screw 43 and the y-axis adjusting screw 44.
[0032]
When the position adjustment of the field frame 30 is completed, the eyepiece 25 is fixed to the finder lens holding frame 11 and the upper lid 12 using an adhesive. If it is held by tweezers or the like, the position of the eyepiece lens 25 may be shifted again at the time of fixing. On the other hand, in this embodiment in which the adjustment operation tool 57 is engaged with the positioning protrusion 33, the eyepiece 25 is held in the plane orthogonal to the optical axis as long as a force is applied in the advance direction of the pair of adjustment operation tools 57. Therefore, it is possible to easily perform the bonding operation with less misalignment. The eyepiece 25 may be fixed by using means such as fusion instead of the adhesive.
[0033]
As described above, the holding structure of the eyepiece lens 25 during the adjustment work is improved by the simple structure in which the engaging groove 33a is provided in the positioning protrusion 33 of the eyepiece lens 25 and the adjustment operation tool 57 is engaged therewith. That is, as described above, since the eyepiece lens 25 is held by the force in the direction in which the pair of adjustment operation tools 57 are pushed in, the eyepiece lens 25 is easily held, and the position shift of the eyepiece lens 25 during the adjustment operation and after the position adjustment can be prevented. Further, since the adjusting operation tool 57 is tapered in the insertion direction and its tip is semicircular to avoid contact with the corner portion of the engaging groove 33a, the occurrence of rattling at the time of engagement is suppressed, which is good. Can exhibit excellent retention. Therefore, the response to the adjustment operation (movement of the eyepiece lens 25) is reliable and workability is improved. Therefore, position adjustment becomes easier than in the prior art. This effect can be obtained in the same way even when the adjustment operation tool 57 is held by hand.
[0034]
Further, when the adjusting device 41 is used, the pair of adjusting operation tools 57 are guided and supported in the advancing / retreating direction, and the force of the pair of compression springs 58 acts equally from both sides in the advancing direction. It is always held at a fixed position. Therefore, the finder block 10 and the adjustment operation tool 57 can be set without being held by hand. Since the adjustment is performed by rotating the x-axis adjusting screw 43 and the y-axis adjusting screw 44, the visual field frame can be finely adjusted more easily. In particular, when the eyepiece lens 25 is held with spring force from both sides, the eyepiece lens 25 is not allowed to be adjusted in the slit 19 during adjustment without setting the thickness of the positioning projection 33 in the optical axis direction as strict as in the past when the eyepiece lens 25 is molded. Since it does not become stable, the lens can be manufactured at low cost.
[0035]
FIG. 10 shows different embodiments of the eyepiece and the adjustment operation tool. A pair of positioning protrusions 67 are provided on the side of the eyepiece 65 having a field frame 66 deposited on the front surface. The positioning projection 67 has a semicircular convex portion 67 a, and a semicircular concave portion 69 that engages with the semicircular convex portion 67 a is formed at the end of the adjustment operation tool 68. The eyepiece 65 is the same size as the eyepiece 25, and the positioning protrusion 67 does not protrude outward from the slit 19 in a state where it is supported by the finder lens holding frame 11. The adjustment operation tool 68 has a thickness that can be inserted into the slit 19. The position adjustment of the field frame is performed in the same manner as described above. When the pair of adjustment operating tools 68 are inserted into the slit 19, the semicircular concave portion 69 engages with the semicircular convex portion 67a. 65 is moved. Since the semicircular convex portion 67a and the semicircular concave portion 69 are engaged, the eyepiece 65 can be held from both sides by the force in the insertion direction of the adjustment operating tool 68 in this embodiment, and the adjustment work is facilitated. Further, rattling is unlikely to occur due to the engagement shape of the semicircular convex portion 67 a and the semicircular concave portion 69. The pair of adjustment operation tools 68 may be held by hand or attached to the adjustment device 41 described above.
[0036]
FIG. 11 shows a further different embodiment. The eyepiece 70 having the field frame 71 has a pair of positioning projections 72 protruding sideways. The positioning projection 72 is formed in a trapezoidal shape in which the end surface 72b facing the slit is shorter in the vertical direction than the base end surface 72a on the center side of the eyepiece lens 70 when viewed from the front. Engagement recesses 74 that are cut out in a trapezoidal shape that engages with the positioning protrusions 72 are formed at the ends of the pair of adjustment operation tools 73. Since the positioning projection 72 has a pair of inclined surfaces 72c with respect to the insertion direction of the adjustment operation tool 73, when the positioning projection 72 is engaged, the eyepiece 70 can be stabilized in a plane orthogonal to the optical axis. Since the positioning projection 72 is a simple shape lacking the upper and lower ends of the rectangular projection, it can be easily manufactured and supplied at low cost. If the engagement recess 74 has a shape along the corner between the end surface 72b and the inclined surface 72c, rattling at the time of engagement is likely to occur. Therefore, as shown in FIG. It is preferable to increase the value of the cut depth D1 of the joint recess 74 and engage only the two inclined surfaces.
[0037]
Each of the above embodiments adjusts the field frame position of the finder. Therefore, the member provided with the field frame may not be a lens but may be flat glass or plastic that does not collect or diverge light.
[0038]
Conversely, the present invention is also effective for optical axis adjustment of an optical system that is performed by moving an optical member such as a lens that does not have a field frame. That is, in the above embodiment, the eyepiece 25 is moved in a plane orthogonal to the optical axis in order to adjust the field frame 30, but at this time, the optical axis is also moved. For example, a pair of side projections having concave grooves similar to the positioning projections 33 are provided on a desired lens having a relatively high sensitivity other than the eyepiece lens 25, and the pair of side projections are used as a support frame of the finder optical system. It is slidably fitted in the provided slit. Then, an adjustment operating tool having a shape that engages with the concave portion is inserted into the slit from the outside, and the lens is moved in a plane orthogonal to the optical axis in the engaged state of both. When the lens is moved, the image position on the eyepiece side is moved in a plane, and this is moved in a desired direction to adjust the optical axis of the finder optical system. This lens position adjustment mechanism is not limited to the finder optical system, but can be applied to optical members of other types of optical devices such as the imaging optical system 36. The optical axis adjustment and the viewfinder field frame adjustment are common in that the optical member (lens or field frame member) is moved in a plane perpendicular to the optical axis. Work becomes easy.
[0039]
【The invention's effect】
As described above, the finder field frame adjustment of the present invention in which the pair of positioning projections provided on the lens or the field frame member and the end portions of the pair of adjustment operation tools are formed into the concave and convex shapes that are engaged with each other by inserting the operation tool. According to the mechanism and the optical member position adjustment mechanism, the viewfinder frame adjustment and the optical member position adjustment can be easily performed with a simple configuration.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a finder block to which a field frame adjusting mechanism according to the present invention is applied.
FIG. 2 is a perspective view of a finder block in a state where a lens is incorporated.
FIG. 3 is a plan view of FIG. 2;
FIG. 4 is a left side view of an optical unit of a camera including a finder block.
FIG. 5 is a rear view of the optical unit as viewed from the arrow V side in FIG. 4;
FIG. 6 is a left side view of the adjustment device.
7 is a rear view of the adjusting device viewed from the arrow VII side in FIG. 6;
8 is a plan view of the adjusting device as seen from the arrow VIII side in FIG. 6;
FIG. 9 is an enlarged perspective view showing a positioning projection and an adjustment operation tool of a visual field frame member.
10 is an enlarged perspective view showing a positioning projection of a field frame member and an adjustment operation tool according to an embodiment different from that of FIG. 9;
FIG. 11 is an enlarged front view showing a positioning projection and an adjustment operation tool of a visual field frame member according to still another embodiment of the present invention.
FIG. 12 is a perspective view showing an example of a viewfinder having a conventional field frame adjustment mechanism.
[Explanation of symbols]
10 Finder block
11 Viewfinder lens holding frame
19 Slit
23 First lens
24 Second lens
25 65 70 Eyepiece (field frame member)
30 66 71 Field frame
33 67 72 Positioning protrusion
33a Groove for engagement
35 Imaging lens support
36 Imaging optical system
40 Optical unit
41 Adjustment device
42 Two-way moving unit
43 x-axis adjusting screw
44 Y-axis adjustment screw
53 Operating tool support frame
53a concave space
55 Slide body
57 68 73 Adjustment operation tool
57a Circular tip
58 Compression spring

Claims (9)

A pair of slits formed in the finder holding frame and extending in parallel in a plane perpendicular to the optical axis of the finder;
A field frame member having a field frame supported movably in a plane parallel to the pair of slits via a pair of positioning projections slidably fitted in the pair of slits;
In the viewfinder that adjusts the position of the field frame member by engaging the adjustment operation tool inserted from the pair of slits with the positioning projection during assembly adjustment,
2. A field frame adjustment mechanism for a finder, wherein the pair of positioning projections and the pair of adjustment operation tools are provided with concave and convex shapes that engage with each other. 2. The viewfinder frame adjustment mechanism according to claim 1, wherein the pair of positioning protrusions include a pair of concave grooves having a pair of opposing walls that narrow the opposing interval toward the center side of the field frame member. The tool is a finder field frame adjustment mechanism having a pair of tapered surfaces in contact with opposing walls in the groove. 2. The field frame adjustment mechanism for a viewfinder according to claim 1, wherein the pair of positioning protrusions have semicircular convex portions, and the end portions of the pair of adjustment operating tools are half-engaged with the semicircular convex portions. Viewfinder frame adjustment mechanism with a circular recess. 2. The field frame adjustment mechanism for a viewfinder according to claim 1, wherein the pair of positioning protrusions has a trapezoidal convex shape having a pair of inclined surfaces that are widened toward the center side of the field frame member, and the pair of adjustment operations. A field frame adjustment mechanism of the finder having a concave shape that engages the pair of inclined surfaces at the end of the tool. 5. A field frame adjustment mechanism for a viewfinder according to claim 1, wherein the pair of adjustment operating tools are supported and guided in a linear movement direction to be engaged with and disengaged from the pair of positioning protrusions. mechanism. 6. The finder field frame adjustment mechanism according to claim 5, wherein the pair of adjustment operating tools are biased with a uniform spring force in a direction to engage with the pair of positioning projections. 7. A field frame adjustment mechanism for a finder according to claim 1, wherein the field frame member is adjusted at the position after positioning so that the pair of positioning protrusions are fixed to the finder holding frame. mechanism. A pair of slits formed in a support frame of the optical member and extending in parallel in a plane perpendicular to the optical axis of the finder;
An optical member supported movably in a plane parallel to the pair of slits via a pair of positioning protrusions slidably fitted in the pair of slits;
In the position adjustment mechanism of the optical member that adjusts the position by moving the optical member by engaging the adjustment operation tool inserted into the pair of slits with the positioning protrusion during assembly adjustment,
An optical member position adjusting mechanism, wherein the pair of positioning protrusions and the pair of adjusting operation tools are provided with concave and convex shapes that engage with each other. 9. The optical member position adjusting mechanism according to claim 8, wherein the optical member is positioned at the position after positioning, and the pair of positioning protrusions are fixed to the support frame.

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