JP4504073B2 - Lens device and camera equipped with the lens device - Google Patents

Description

  The present invention relates to a photographic lens device, and more particularly to a retractable photographic lens device mounted on a camera.

  Traditionally, filming using a silver salt film—general-purpose small cameras and digital cameras with built-in CCDs (charge coupled devices) are usually carried around. is there. Therefore, miniaturization of the camera is an important design point in order to improve the portability.

  The camera has a convenient but low-performance camera that can shoot from a long distance to a short distance without moving the lens group using only a pair of lens groups with a shallow focus, and each group is divided into multiple groups. Each pair is configured to be held in an independent lens frame, and each lens group can be moved in the direction of the optical axis to change the focal length according to shooting conditions such as wide-angle shooting and telephoto shooting. There is a performance camera.

  In particular, in a high-performance camera with a telephoto function described above, it is necessary to obtain a desired optical characteristic that the distance between the lens groups during photographing is set to a predetermined distance by movement. is there. However, in order to set the interval between the lens groups to a predetermined interval at the time of photographing as described above, the structure includes a lens barrel that movably accommodates a lens frame that respectively holds a plurality of lens groups. A part of the lens device protrudes from the camera body to the front side.

  By the way, when carrying the camera without using a camera, it is not necessary to set each lens group at a predetermined interval required for shooting, so the lens groups are moved as close to each other as possible for convenient portability. Various types of so-called collapsible lens devices have been proposed in which the length of the lens device in the optical axis direction is shortened to reduce the thickness of the entire camera. In particular, in a lens apparatus having a high telephoto zoom ratio, the forward projecting degree at the time of photographing is large, so that the effect of shortening by retracting as described above is enhanced.

  Normally, in the zoom photographing lens apparatus as described above, it is necessary to move each lens group to a predetermined position when setting the zoom ratio or adjusting the focus. For this movement, for example, each lens group is moved using a cam cylinder. There is something. In the case of a zoom photographing lens device using such a cam barrel, a cam groove for moving the retract is added to the cam barrel for the lens movement at the time of photographing, and each lens group is moved to the retracted position. Is done. This eliminates the need for a new moving device for moving the collapsing, and facilitates the downsizing of the camera together with the collapsing effect.

  On the other hand, even in such a zoom photographing lens device, for example, the aperture and the shutter member are often optically fixed in position in the optical axis direction unlike the photographing lens group. Therefore, if a dedicated moving device is added to move the aperture and shutter member only when retracted, the lens device becomes large and the design of the cam part becomes difficult, so the aperture and shutter member remain fixed even when retracted. There were a lot of things.

FIG. 10A is a cross-sectional view showing a state of the zoom photographing lens device having such a configuration in which the conventional diaphragm and shutter member remain fixed even when retracted, and FIG. A sectional view showing the retracted state, FIG. 10 (c) is a perspective view showing the cam cylinder.
As shown in FIG. 2A, the lens barrel 1 includes a fixed frame 2, a cam barrel 3, and a first group / second group lens support tube 4.

  A CCD (charge coupled device) 5 is held at the center of the fixed frame 2, and a third group / fourth group lens main suspension shaft 6 extending inwardly in parallel with the central axis is fixed and supported at the upper part. The third group / fourth group lens sub-suspending shaft and the aperture shutter rotation prohibiting shaft, which are not shown in the drawing, are slightly supported in the lateral direction from the lowermost portion, and are fixedly supported. A motor 8 having a drive gear 7 is held at the lowermost end.

  For example, as shown in FIG. 2C, the cam cylinder 3 has a first group lens cam groove 11 formed on the outer peripheral surface, and a second group lens cam groove 12 and third group lens formed on the inner peripheral surface. Cam groove 13 and fourth group lens cam groove 14 are formed. A gear 15 is formed on the outer peripheral surface of the rear end. The gear 15 meshes with the drive gear 7 shown in FIG. 1A, and the entire cam cylinder 3 is rotationally driven by the motor 8.

  The first group / second group lens support cylinder 4 supports a first group lens 17 on a first group lens support portion 16 formed therein, as shown in FIG. A second group lens main suspension shaft 18 extending inward from the lower portion of the portion 16 in parallel to the central axis is fixedly supported. The first group / second group lens support cylinder 4 includes a cam follower 19 projecting from an inner peripheral surface end facing the second group lens main suspension shaft 18. The cam follower 19 is shown in FIG. Is engaged with the cam groove 11 on the outer peripheral surface of the cam cylinder 3 shown in FIG.

  Further, a bearing portion 23 of a second group lens holding member 22 for holding the second group lens 21 is slidably fitted on the second group lens main suspension shaft 18 shown in FIG. Although not clearly visible in the drawing, a protrusion is formed on the upper part of the second group lens holding member 22, and the protrusion is formed on the inner peripheral surface of the first group / second group lens support cylinder 4. The second group lens main suspension shaft 18 is prohibited from rotating by being slidably engaged with the groove.

A cam follower 24 is formed at the lower end of the rear end of the bearing portion 23 of the second group lens holding member 22. The cam follower 24 is engaged with the cam groove 12 on the inner peripheral surface of the cam cylinder 3 shown in FIG. Match.
Further, the third group / fourth group lens main suspension shaft 6 of the fixed frame 2 is fitted with a bifurcated bearing 27 of a third group lens holding member 26 for holding the third group lens 25. The cam follower 28 formed on one upper portion of the bifurcated bearing 27 is engaged with the cam groove 13 on the inner peripheral surface of the cam cylinder 3 shown in FIG.

  Further, the third group / fourth group lens main suspension shaft 6 has a four-group lens holding member 31 for holding the fourth group lens 29 in a bifurcated bearing 32 which intersects with the two branches of the bearing 27. The cam follower 33 formed on one upper portion of the bifurcated bearing 32 is engaged with the cam groove 14 on the inner peripheral surface of the cam cylinder 3 shown in FIG. Yes.

Further, the aperture / shutter 34 is disposed on the protruding end of the third group / fourth group lens main suspension shaft 6 and the projection end of the third group / fourth group lens sub-suspending shaft (not shown) and the stop shutter rotation prohibiting shaft. Is fixed in position.
In the shooting state shown in FIG. 5A, the second group lens 21 and the first group lens 17 and the aperture / shutter are rotated according to the rotation of the cam cylinder 3 which is driven to rotate by the switch operation of the telephoto zoom shooting by the photographer. The third lens group 25 and the fourth lens group also move back and forth between the aperture / shutter 34 and the CCD 5 in accordance with the rotation of the cam cylinder 3, respectively.

Then, when the photographing is finished, the portable camera is shortened to the retracted state as shown in FIG. 5B in accordance with the rotation of the cam cylinder 3 that is driven to rotate by the photographing end button operation by the photographer.
FIG. 11 is a developed view showing the inner peripheral surface by cutting the circumferential side surface of the cam cylinder 3 shown in FIG. 10 (c) along a straight line parallel to the central axis indicated by AA ′ in FIG. 10 (c). It is. Note that the first group lens cam groove 11 formed on the surface (the outer peripheral surface of the cam cylinder 3) on the side of the development shown in FIG. 11 is not visible in the drawing.

  FIG. 11 shows the second group lens cam groove 12, the third group lens cam groove 13, the fourth group lens cam groove 14, and the cam follower insertion grooves 35 and 36 when the lens barrel 1 is assembled. As shown in the figure, the cam groove 12 for the second lens group has a retracted position 12-1 and a wide angle on a half surface (180 ° circumferential surface) of the entire surface of the cam tube 3 (360 ° circumferential surface). It is formed in a mountain-shaped groove composed of a photographing position 12-2 and a telephoto photographing position 12-3.

  The cam barrel 3 has a shape shortened to the limit in order to make the entire lens barrel 1 as short as possible. For this reason, the above chevron is a retracted position 12-1 corresponding to the foot of the mountain. The telephoto shooting position 12-3 is disposed close to the rear end portion of the cam tube 3, and the wide-angle shooting position 12-2 corresponding to the top of the mountain is disposed close to the front end portion of the cam tube 3. That is, it has a shape that uses all the front and rear moving regions. Therefore, if another cam groove is arranged in this same region, the cam groove always intersects at any position, so it is not considered to arrange another cam groove in this same region.

  Further, in order to suppress the driving load when the second group lens 21 is moved by the second group lens cam groove 12, it is necessary to make the slope of the mountain shape gentle, that is, to widen the base of the mountain. . For this purpose, it is necessary to make the rotation angle of the region where the second group lens cam groove 12 is arranged as large as possible.

On the other hand, in order to move the other lens group together with the second group lens 21 within the same rotation angle of the cam cylinder 3, the rotation angle of the arrangement region of the second group lens cam groove 12 and the arrangement of the other cam grooves are arranged. The rotation angle of the area must be the same.
For these two reasons, the entire inner peripheral surface of the cam cylinder 3, that is, the 360 ° region is used, and the region is divided into two. First, the second group lens cam is divided into one 180 ° region. The groove 12 is disposed, and the third group lens cam groove 13 and the fourth group lens cam groove 14 having a small amount of forward and backward movement are disposed in the other 180 ° region in a substantially parallel form. Has been.

  In this configuration, the cam cylinder 3 rotates in both forward and reverse directions within a range of 180 °. When the cam cylinder 3 is rotated by 180 ° in the forward direction, the second lens group 21 is pushed forward at an inclined portion at the time of the first approximately 90 ° rotation from the retracted position 12-1 to the wide-angle photographing position 12-2. (At this time, the first lens group 17 is simultaneously pushed forward by the cam groove 11 on the outer peripheral surface of the cam barrel 3).

Then, with the remaining 90 ° rotation of the cam barrel 3, the second group lens 21 is set to the zoom position at the inclined portion from the wide-angle shooting position 12-2 to the telephoto shooting position 12-3 (during this time, the first group The lens 17 is fixed at the position pushed forward.
Further, the third group lens cam groove 13 and the fourth group lens cam groove 14 have parallel straight portions from the retracted positions 13-1 and 14-1 to the wide-angle photographing positions 13-2 and 14-2, respectively. Bending portions having different shapes are formed, each having a shape obtained by slightly bending a straight line from the wide-angle imaging positions 13-2 and 14-2 to the telephoto imaging positions 13-3 and 14-3.

  Thus, the third group lens 25 (that is, the cam follower 28 of the third group lens holding member 26) and the fourth group lens 29 (that is, the cam follower 33 of the fourth group lens holding member 31) are shown in FIG. In this way, it is supported back and forth on the same suspension shaft (third lens group / fourth group lens main suspension shaft 6), and individually moved back and forth at the time of telephoto zoom shooting, and set to a position corresponding to the zoom position, Since the aperture / shutter is fixed from the time of retracting to the time of wide-angle shooting, the rear third lens group and the fourth group lens do not need to be retracted, and are therefore fixed at the same fixed position as at the time of wide-angle shooting.

  By the way, FIG. 10B is positioned by the configuration of the third group lens cam groove 13 and the fourth group lens cam groove 14 in which the retracted positions 13-1 and 14-1 shown in FIG. 11 are formed. When the lens barrel is retracted, large space portions a, b, and c are formed in the lens barrel 1 behind the aperture / shutter 34 held by the fixed frame. In this case, there is still a margin in the degree of shortening of the lens barrel 1, and although the first and second group lenses are retracted, the retracting is not sufficiently realized as a whole.

In recent years, when the market demand for thinning the camera as a whole has become stronger, it has been fixed both at the time of shooting and at the time of retracting in order to further shorten the retracting time of the lens device. The diaphragm / shutter fixing frame is also required to have a structure in which the lens barrel moves when retracted.
FIG. 12 shows such an aperture / shutter fixing frame (in the following description, the other optical systems, that is, the lens groups from the second group to the fourth group move during shooting, that is, wide-angle, zoom, and telephoto shooting. On the other hand, it is a diagram showing a configuration example of a cam groove on the inner peripheral surface of the cam cylinder for moving a fixed frame (represented as a fixed frame in the sense that the position is always fixed at a fixed position) during retraction.

  As described above, other cam grooves cannot be arranged in the arrangement region of the second group lens cam groove 12 on the right half surface in the figure, but the lens cam grooves 13 and 14 on the third group and fourth group on the left half surface. The third lens group and the fourth lens group have a small amount of movement, so that the shape of the groove lies almost horizontally, and there is room for forming a cam groove for moving the diaphragm / shutter fixing frame above them. There is.

  Then, as shown in FIG. 12, a diaphragm / shutter cam groove 37 for moving the diaphragm / shutter fixing frame is formed above the third and fourth lens cam grooves 13, 14 to form a wide angle. The shooting position 37-2 and the telephoto shooting position 37-3 are formed horizontally to fix the position of the aperture / shutter, and the aperture / shutter is moved from the wide-angle shooting position 37-2 to the retracted position 37-1. For this purpose, the cam cylinder 3 is inclined toward the rear end.

  Further, since the aperture / shutter is moved in a retracted manner, the lenses in the third group and the fourth group are also moved in a retracted manner to shorten the spaces b and c shown in FIG. 10 (b). The third and fourth lens cam grooves 13 and 14 are inclined from the wide-angle shooting positions 13-2 and 14-2 to the retracted positions 13-1 and 14-1 toward the rear end of the cam barrel 3. If the cam barrel 3 is configured in this way, the spaces a, b and c shown in FIG. 10 (b) are shortened, the waste of space is eliminated, and the degree of collapsing of the entire lens barrel 1 is increased so that it can be carried. Can contribute to miniaturization of cameras.

  However, since the aperture / shutter cam groove 37 is arranged in the 180 ° region of the left half surface in parallel with the lens cam grooves 13 and 14 of the third group and the fourth group as described above, the third group and the fourth group. The movement positions of the lens cam grooves 13 and 14 and the movement positions of the aperture / shutter cam grooves 37 are necessarily arranged at the same rotation angle. It is necessary to engage the bearing for the same suspension shaft as that for the third and fourth lens groups, that is, the third and fourth lens group main suspension shaft 6. Otherwise, in other words, if a suspension shaft is provided separately and the bearing and the cam follower are arranged at positions away from each other in the rotational direction of the cam groove, a twist is applied between the bearing and the cam follower during movement, and the position of the aperture / shutter 34 There is a risk of going crazy.

  However, if the moving bearings of the aperture / shutter fixing frame are engaged with the third group / fourth group lens main suspension shaft 6, the third group, the second group within the limited length of the main suspension shaft. Three bearings, that is, the third group lens of the fourth group lenses 25 and 29, the bearings 27 and 32 of the fourth group lens holding members 26 and 31, and the moving bearing of the aperture / shutter fixing frame are fitted on the main suspension shaft. As a result, the engagement length of each bearing with the main suspension shaft cannot be taken sufficiently.

Such a configuration is not only technically difficult, but if the engagement length is not sufficient, the positioning of the third and fourth lens groups 25 and 29 and the aperture / shutter 34 becomes unstable, and the optical axis performance is increased. There is a possibility that it is difficult to secure a correct image and it is impossible to capture a correct image.
Therefore, considering that the main suspension shaft for the diaphragm / shutter 34 is provided independently, the main suspension shaft is placed as close as possible to the inner peripheral surface of the cam cylinder 3 so as not to generate unnecessary stress between the cam follower and the bearing. Therefore, the main suspension shaft is necessarily disposed at a position different from the third group / fourth group lens main suspension shaft 6 in the rotation direction of the cam barrel.

FIG. 13 shows the cam cylinder in the case where the main suspension shaft for the aperture / shutter 34 is provided independently at different positions in the rotation direction of the cam cylinder with respect to the third group / fourth group lens main suspension shaft 6. It is an expanded view which shows the structure of the inner peripheral surface.
The main suspension shaft for the diaphragm / shutter 34, that is, the cam follower on the bearing thereof, and the third group / fourth group lens main suspension shaft 6, that is, the third group, the cam followers 28 on the bearings 27, 32 of the fourth group lenses 25, 29 are used. 33, when the main suspension shaft for the aperture / shutter 34 is displaced from the third group / fourth group lens main suspension shaft 6 in the rotation direction of the cam tube. However, as shown in the figure, the arrangement range of the diaphragm / shutter cam groove 38 that engages with the cam follower for the diaphragm / shutter 34 is from the arrangement position of the third group and fourth group lens cam grooves 13, 14. It will shift. In the example shown in the figure, focusing on the fact that there is a vacant area on the upper left side of the 180 ° area on the right half surface of the cam cylinder 3, ignoring the point intersecting the cam follower insertion groove 36, the diaphragm / shutter cam groove 38 is shown. Are shifted to the 180 ° region side of the right half surface.

  In order to eliminate the problem that occurs when the diaphragm / shutter cam groove 38 intersects the cam follower insertion groove 36 in this way, two diaphragm / shutter cam grooves 38 are formed in parallel. Although not particularly shown, two cam followers are arranged on the bearings of the diaphragm / shutter fixing frame.

The amount of displacement between each of the two retracted positions 38-1, the wide-angle photographing position 38-2, and the telephoto photographing position 38-3 where the position of the two cam followers is regulated is at least larger than the width of the cam follower insertion groove 36. The setting is greatly deviated.
As a result, whenever one of the two cam followers is at the intersection with the cam follower insertion groove 36, the other cam follower is always in a regular groove that is not at the intersection of the aperture / shutter cam groove 38. The two cam followers are always driven to move correctly according to the diaphragm / shutter cam groove 38, so that the diaphragm / shutter can be correctly moved between the fixed position and the retracted position. Further, since the two main suspension shafts are individually arranged, the engagement length of each bearing with the main suspension shaft can be sufficiently taken.

  However, the above configuration certainly eliminates the problem that occurs when the aperture / shutter cam groove 38 intersects the cam follower insertion groove 36, but two cam grooves having the same function are formed in parallel. The necessity and the arrangement of two cam followers having the same function are problematic in terms of manufacturing accuracy. Since the entire lens apparatus has a fine structure, if any cam groove arrangement or accuracy is slightly deviated, two cam followers may compete to inhibit the rotation of the cam cylinder 3.

Therefore, the present applicant pulls out the aperture / shutter frame, which is a fixed frame, from the retracted position to the photographing position with the first group lens, and pushes it back from the photographing position to the retracted position with the second group lens. A lens apparatus has been proposed in which the aperture / shutter frame is moved by using movement, and a complicated configuration for new movement is not necessary. (For example, refer to Patent Document 1.)
JP 11-218665 A

However, the technology of Patent Document 1 still has room for improvement. SUMMARY OF THE INVENTION An object of the present invention is to provide a lens device in which a problem caused by a cam groove intersecting with a cam follower insertion groove is eliminated, and a camera equipped with the lens device.

First, a lens device according to a first aspect of the present invention includes a first optical member included in a photographing optical system,
A cam groove for the first optical member that engages with a cam engaging portion of the first optical member and defines a position in the optical axis direction of the first optical member;
A second optical member included in the imaging optical system and used across the first region and the second region;
A cam groove for the second optical member, which passes through the cam engaging portion of the second optical member without engagement in at least a part of the first region; A second optical member cam groove having an engaging portion with which the cam engaging portion of the second optical member is engaged in two regions;
In the first region, the second optical member is biased toward the first optical member, and in the first region, the position of the second optical member in the optical axis direction is the first optical member cam. A biasing member that follows the position of the first optical member defined by the groove;
Along with the cam groove for the first optical member and the cam groove for the second optical member, another cam groove to which a cam engaging portion of another optical member included in the photographing optical system is engaged and the other Cam members each having insertion grooves for loading cam engaging portions of the other optical members into the cam grooves,
The insertion groove is configured to be formed on the same surface of the cam member as the second optical member cam groove and at a position intersecting the free passage portion .

  In this lens device, for example, the first area is at least a part of a non-photographing area, and the second area is a photographing area. In this case, the second optical member is configured to be defined at a fixed position regardless of the movement amount of the other optical members in the imaging region, for example. The second optical member is, for example, a diaphragm or a shutter member. Further, the second optical member is disposed, for example, between the first optical member and another optical member, and the first and second optical members are moved from the retracted region to the photographing region. And the other optical members are configured to move in the direction of the subject with respect to the photographic lens device. In addition, the second optical member is configured to be released from urging by the urging member in at least a part of the second region, for example. The urging member is provided, for example, along a guide member that guides the movement of the second optical member in the optical axis direction.

Moreover, the lens apparatus, for example, is configured to include an imaging element for imaging.

And the camera of 2nd invention is equipped with the lens apparatus of the said 1st invention as a lens apparatus for imaging | photography.

ADVANTAGE OF THE INVENTION According to this invention, the camera which mounts the lens apparatus which eliminates the malfunction which generate | occur | produces when a cam groove cross | intersects a cam follower insertion groove, and the lens apparatus can be provided .

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the first optical member is composed of, for example, a second group unit, the second optical member is composed of, for example, a diaphragm / shutter unit 71, and the urging member is composed of, for example, a push spiral spring 76 or the like. The guide member is composed of, for example, a diaphragm / shutter suspension shaft 70, and the other optical member is composed of, for example, a first group unit, a third group unit, a fourth group unit, and the like.

  Further, in the lens device of the present invention described below, four sets of lens groups that are each independently supported by a support frame are incorporated. In the following description, these lens groups, a support frame, a bearing, The suspension shaft, cam follower, and the like are collectively described for each group and referred to as one group, two groups, three groups, and four groups.

  FIG. 1 is a perspective view of the camera as the first embodiment when viewed from the front. As shown in the figure, the camera 40 has a grip part 41 that also serves as a battery chamber on the left side of the figure, and a self-timer lamp 42 is arranged on the upper right side of the camera 40. A group cylinder frame 43 (corresponding to the first and second group unit support cylinders 4 shown in FIGS. 10A and 10B) protrudes to the photographing position, and the first group lens 44 is disposed on the forefront thereof. Is visible.

  On the upper surface of the camera 40, a zoom lever 45 and a shutter button 46 disposed at the center of rotation of the zoom lever 45 are disposed in front of the left end portion of the figure, and a mode dial 47 is disposed behind the shutter button 46. In the center of the upper surface, a flash 48 that can be freely projected and retracted is disposed.

Further, on the right side of the figure, a strap attaching portion 49 is provided at the upper portion, and a protective cover 51 for covering various input / output terminals is provided at almost the entire lower portion thereof.
On the back of the camera 40, in addition to the viewfinder 52, a diopter adjustment dial, a self-timer / erase button, a macro / spot / print reservation button, a flash jump button, a flash button, a power switch, A liquid crystal monitor, a liquid crystal monitor display switching button, an OK / menu button, and the like are provided.

  FIG. 2 is a development view showing the configuration of the cam groove of the cam cylinder in the lens device incorporated in the camera 40 as the second embodiment. In the figure, the front side surface is the inner peripheral surface of the cam cylinder, and the side facing the drawing is the outer peripheral surface. The cam grooves formed on the inner peripheral surface are indicated by solid lines, and the cam grooves formed on the outer peripheral surface are indicated by broken lines. Further, in the same figure, for comparison with FIG. 11, the breakage position of the development is indicated by AA ′ as in the case of FIG. 11.

  As shown in the figure, the cam cylinder 53 of this example is formed with a cam groove 54 for the first group unit on the outer peripheral surface at every 120 ° rotation angle. There are a retracted position 54-1, a wide-angle shooting position 54-2, and a telephoto shooting position 54-3 at the same position, and each has a first group cam follower insertion groove 54-4.

On the other hand, on the inner peripheral surface of the cam cylinder 53, the cam groove 55 for the second group unit is formed on the right half surface in the shape and configuration substantially the same as shown in FIG. A cam groove 56 and a fourth group unit cam groove 57 are formed.
Similarly to the case of FIG. 12 or FIG. 13, the second group unit cam groove 55 is formed with a retracted position 55-1, a wide angle photographing position 55-2, and a telephoto photographing position 55-3, and a second group cam follower insertion groove 55-. 4 is provided.

Similarly, the third group unit cam groove 56 and the fourth group unit cam groove 57 are retracted positions 56-1, 57-1, wide-angle photographing positions 56-2, 57-2, and telephoto photographing positions 56-3, 57. -3 is formed, and the third and fourth group cam follower insertion grooves 58 are provided.
In this example, as in the case of FIG. 13, a diaphragm / shutter main suspension shaft is independently provided, and a diaphragm / shutter cam groove 59 engaged with a diaphragm / shutter cam follower of a bearing that is externally fitted to the main suspension shaft. Are shifted in the direction of the empty area on the upper left side of the 180 ° area on the right half surface of the cam cylinder 53.

  As shown in the figure, the aperture / shutter cam groove 59 has a single groove configuration although it intersects the second group cam follower insertion groove 55-4. The aperture / shutter cam groove 59 is located at a position displaced from the third group unit cam groove 56 and the fourth group unit cam groove 57 in the right half surface direction, at a retracted position 59-1, a wide angle photographing position 59-2, and a telephoto photographing. A position 59-3 is formed, and an aperture / shutter cam follower insertion groove 59-4 is provided.

  Here, as a feature of this example, the diaphragm / shutter cam groove 59 crosses the retracted position 59-1 and the second group cam follower insertion groove 55-4 to a position immediately after passing in the direction of the wide-angle photographing position 59-2. The width is widened and the restriction on the diaphragm / shutter cam follower by the diaphragm / shutter cam groove 59 is released. That is, this portion is a free portion 59-5 in which the aperture / shutter cam follower as the cam engaging portion simply reciprocates without engaging with the aperture / shutter cam groove 59. Of the shutter cam groove 59, the loose portion 59-5 is referred to as a first region, and a groove functioning as a narrow cam engaging portion is referred to as a second region.

  The movement region of the lens device is a region in the process of retracting or extending the lens device into the case 40, and includes a retracted region that is a region from each retracted position to immediately before each wide-angle photographing position, and each wide-angle photographing position. It is divided into shooting areas which are areas between the telephoto shooting positions. The retracted area can also be called a non-photographing area. In addition, the first area that is the loose portion 59-5 does not necessarily occupy the entire retracted area, but may be only a part of the retracted area.

  FIG. 3 is a cross-sectional view of a lens device incorporated in the camera 40 of FIG. This sectional view shows that the third group cam follower and the fourth group cam follower are respectively retracted positions 56-1 and 57- of the third group unit cam groove 56 and the fourth group unit cam groove 57 shown in FIG. FIG. 5 is a cross-sectional view passing through the central axis of the lens device from the retracted positions 56-1 and 57-1 when located at 1;

  As shown in FIG. 3, the lens device 60 includes a fixed frame 61 fixed to the camera body, and a motor (not shown) (see FIG. 10) fixedly disposed on the fixed frame 61 at the front of the fixed frame 61. The cam cylinder 53 shown in FIG. 2 which is driven to rotate by the motor 8 and the drive gear 7 in a) is disposed. Further, the cam cylinder 53 is externally fitted to the cam cylinder 53, and the first group shown in FIG. A cylinder frame 43 is arranged.

  A first group frame 62 that fixes and supports the first group lens 44 is fixedly disposed at the front of the first group cylinder frame 43, and the first group cam follower 63 faces upward at the rear end portion of the inner peripheral surface of the first group cylinder frame 43. Projected to The first group cam follower 63 engages with the first group unit cam groove 54 on the outer peripheral surface of the cam cylinder 53 shown in FIG.

  A suspension shaft fixing portion 64 is provided below the first group frame 62 at the lower front portion of the first group cylinder frame 43 so that the front end of the cam tube 53 extends from the outside to the inside. The second group main suspension shaft 65 extending rearward (rightward in the drawing) parallel to the central axis of the lens device 60 is fixed and supported. The first group cylinder frame 43, the first group lens 44, the first group frame 62, and the first group cam follower 63 constitute a first group unit.

  The second group bearing 68 formed integrally with the lower end of the second group frame 67 that fixes and supports the second group lens 66 is slidably fitted on the second group main suspension shaft 65 of the first group unit. is doing. A second group cam follower 69 projects downward from the lowermost end of the second group frame 67. The second group cam follower 69 engages with the second group unit cam groove 55 on the inner peripheral surface of the cam cylinder 53 shown in FIG. The second group lens 66, the second group frame 67, the second group bearing portion 68, and the second group cam follower 69 constitute a second group unit.

  Here, in describing the aperture / shutter unit, the third group unit, and the fourth group unit disposed behind the first group unit and the second group unit, a half sectional view of the lens device 60 with a different end from that in FIG. A perspective view and a front view of the three units are shown below.

  FIG. 4 is a half cross-sectional view of the lens device 60 in which the cut end is different from that in FIG. FIG. 4 shows the lens apparatus from the retracted position 59-1 when the aperture / shutter cam follower of the aperture / shutter unit is at the retracted position 59-1 of the aperture / shutter cam groove 59 of the cam cylinder 53 shown in FIG. Sectional drawing which passes along the central axis of this is shown. As shown in FIG. 4, the second group frame 67 is formed with a rear projecting portion 67-1 that presses the front surface of the aperture / shutter unit 71 when moving to the retracted position. This function will be described later.

FIG. 5 is an exploded perspective view showing the aperture / shutter unit, the third group unit, and the fourth group unit extracted from the cam cylinder 53.
FIG. 6 is a front view of the aperture / shutter unit.
FIG. 7 is a front view of the third group unit.

FIG. 8 is a front view of the fourth group unit.
The diaphragm / shutter unit, the third group unit, and the fourth group unit will be described below with reference to FIGS. 4 to 8 and FIG.
First, as shown in FIG. 4, an aperture / shutter suspension shaft fixing portion 61-1 is provided on the upper portion of the fixed frame 61 of the lens device 60. The aperture / shutter suspension shaft fixing portion 61-1 is provided with the lens device. A diaphragm / shutter suspension shaft 70 extending forward (leftward in the figure) parallel to the central axis 60 is fixedly disposed.

  As shown in FIGS. 5 and 6, the diaphragm / shutter unit 71 has a diaphragm opening 72 formed in the center, and a diaphragm / shutter main bearing 73 disposed on the upper part of the diaphragm / shutter suspension shaft 70. And an aperture / shutter sub-bearing 74 is formed in the lower part. An aperture / shutter cam follower 75 projects upward from the upper aperture / shutter main bearing 73. The aperture / shutter cam follower 75 engages with the aperture / shutter cam groove 59 on the inner peripheral surface of the cam cylinder 53 shown in FIG.

  The diaphragm / shutter main bearing 73 has a stepped portion 73-1 extending rearward. As shown in FIG. 4, a push spiral spring 76 that is externally fitted to the stepped portion 73-1 and the aperture / shutter suspension shaft 70 and has a pressing biasing force is used as the aperture / shutter main bearing 73 and the aperture / shutter suspension shaft. It is interposed between the fixed part 61-1.

A shutter blade 77 is disposed on the rear surface of the aperture / shutter unit 71, and a shutter motor 78 and an aperture motor 79 are fixedly disposed.
Returning to FIG. 3 again, the upper part of the fixed frame 61 is suspended in the third and fourth groups at a position different from the above-described stop / shutter suspension shaft fixing part 61-1 (a position shifted by a different cut in the sectional view). A shaft fixing portion 61-2 is provided, and a sub-suspending shaft fixing portion 61-3 is provided at the lower portion. The third and fourth group suspension shaft fixing portion 61-2 is fixedly supported by the third and fourth group suspension shaft 81 extending forward (leftward in the drawing) parallel to the central axis of the lens device 60. The sub-suspending shaft fixing portion 61-3 is fixedly supported by a diaphragm / shutter / third / fourth group sub-suspending shaft 82 that extends forward (to the left in the drawing) in parallel with the central axis of the lens device 60. Has been. The aperture / shutter sub-bearing 74 described above is engaged in the vicinity of the tip of the aperture / shutter / third / fourth group sub-suspending shaft 82 as shown in FIG. 6, and the rotation of the aperture / shutter unit 71 is prohibited.

The third and fourth group main suspension shaft 81 has a third group bearing portion A85-1 and a third group bearing portion B85-2 that are integrally formed at the upper end of a third group frame 84 that fixes and supports the third group lens 83. Is slidably fitted outside.
A third group cam follower 91 projects upward from the upper part of the third group bearing portion A85-1. The third group cam follower 91 engages with the third group unit cam groove 56 on the inner peripheral surface of the cam cylinder 53 shown in FIG. The third group lens 83, the third group frame 84, the third group bearing portion A85-1, the third group bearing portion B85-2, and the third group cam follower 91 constitute a third group unit.

A third group sub-bearing 84-1 is formed at the lower part of the third group frame 84, and this third group sub-bearing 84-1 has a diaphragm, shutter, and third / fourth group sub-suspending shaft as shown in FIG. 7. By engaging with 82, the rotation of the third group unit is prohibited.
Further, the fourth group bearing portion A89-1 and the fourth group bearing portion formed integrally with the fourth group first frame 88 that indirectly engages with the fourth group second frame 87 that fixes and supports the fourth group lens 86. B89-2 crosses the above-mentioned third group bearing portion A85-1 and third group bearing portion B85-2 and is slidably fitted on the third and fourth group main suspension shaft 81.

A fourth group cam follower 92 projects upward from the upper part of the fourth group bearing portion A89-1. The fourth group cam follower 92 engages with the fourth group unit cam groove 57 on the inner peripheral surface of the cam cylinder 53 shown in FIG.
A suspension shaft fixing portion 87-1 is formed on the upper part of the fourth group second frame 87, and the suspension shaft fixing portion 87-1 extends forward in parallel to the central axis of the lens device 60. The fourth group second suspension shaft 93 is fixedly supported.

  The fourth group second suspension shaft 93 is inserted into a sleeve 94 formed integrally with the third group bearing part A85-1 and the third group bearing part B85-2 above the third group frame 84. A flange 95 is fixed to the extending tip portion, and a pressing biasing spiral spring 96 is fitted between the flange 95 and the front end portion of the sleeve 94 so as to be externally fitted to the fourth suspension shaft 93. Yes. Due to the pressing biasing force of the pressing biasing spiral spring 96, the fourth group second suspension shaft 93 is always biased forward of the sleeve 94 via the flange 95, whereby the fourth group second frame 87 is always It is drawn in the direction of the third group frame 84.

  Further, a two-frame sub-bearing 87-1 is formed at the lower part of the fourth group second frame 87, and this two-frame sub-bearing 87-1 has an aperture, a shutter, a third group and a fourth group sub-suspending shaft as shown in FIG. By engaging with 82, rotation of the fourth group second frame 87 is prohibited. Further, as shown in FIG. 8, the fourth group first frame 88 is prohibited from rotating because the projecting portion 88-1 is fitted into the rotation stop groove 90.

  Then, a nut 98 that is slidably engaged with a long hole 97 formed in the fourth group first frame 88 is brought into contact with and engaged with the front surface having a play hole at the top of the fourth group second frame 87. . The drive screw 101 of the fourth group motor 99 fixed to the fourth group first frame 88 is screwed into the screw hole of the nut 98, and the tip thereof is inserted into the play hole of the fourth group second frame 87. ing. When the fourth group motor 99 rotates in the forward direction, the nut 98 moves in the pushing direction, and the fourth group second frame 87 moves backward against the biasing force of the pressing biasing spiral spring 96. On the other hand, when the fourth group motor 99 rotates in the reverse direction, the nut 98 moves in the pull back direction, and the fourth group second frame 87 advances forward by the biasing force of the pressing biasing spiral spring 96. That is, after the reference position is set by the fourth group cam follower 92, the fourth group second frame 87 is finely moved by the nut 98 to be focused.

  4 group lens 86, 4 group 2nd frame 87, 4th group 1st frame 88, 4th group bearing part A89-1, 4th group bearing part B89-2, 4th group cam follower 92, 4th group 2nd suspension shaft 93, flange The fourth group unit is constituted by 95, a pushing biasing spiral spring 96, a long hole 97, a nut 98, a fourth group motor 99, and a drive screw 101.

An optical plate 102 is disposed behind the fourth group unit and held at the converging position of the optical axis O1 at the center of the fixed frame 61, and a CCD 103 is disposed behind the optical plate 102. The optical plate 102 includes a low-pass filter and an infrared cut filter.
FIGS. 9A, 9B, and 9C are diagrams illustrating the operation of the lens device 60 having the above-described configuration. FIG. 4 (a) is a reproduction of FIG. In the retracted position shown in FIG. 9A, the aperture / shutter cam follower 75 of the aperture / shutter unit 71 is in the free passage 59-5 of the aperture / shutter cam groove 59 of the cam cylinder 53 shown in FIG.

  When the cam cylinder 53 rotates to move the lens groups forward from the retracted position of FIG. 9 (a) to the wide-angle shooting position shown in FIG. 9 (b), the aperture / shutter unit 71 is moved to the second group. When the pressing from the rear projecting portion 67-1 of the second group frame 67 accompanying the forward movement of the unit is released, it moves forward by the pressing biasing force of the pushing spiral spring 76, and the pushing spiral spring 76 extends. Before and after the aperture / shutter cam follower 75 is pulled out of the free portion 59-5 of the aperture / shutter cam groove 59 shown in FIG. 2 is restricted by the wide-angle photographing position 59-2 shown in FIG. 2, and in the telephoto photographing state shown in FIG. 9C, it is restricted by the telephoto photographing position 59-3 shown in FIG. Is done.

  When the wide-angle shooting state shown in FIG. 9B or the telephoto shooting state shown in FIG. 9C returns to the retracted state shown in FIG. 9A, the aperture / shutter cam follower 75 is inserted into the second group cam follower insertion groove shown in FIG. Immediately before crossing 55-4, the rear projecting portion 67-1 of the second group frame 67 contacts the front portion of the aperture / shutter unit 71, and the second group frame 67 moves rearward while pressing it further rearward. Thus, the aperture / shutter unit 71 is configured such that the aperture / shutter main follower 73 compresses the helical spring 76 while the aperture / shutter main bearing 73 compresses the aperture / shutter cam follower 75 to the free portion 59-5 of the aperture / shutter cam groove 59 shown in FIG. To do.

  As described above, when the diaphragm / shutter cam follower 75 exists in the free portion 59-5 and crosses the second group cam follower insertion groove 55-4, the aperture / shutter cam follower 75 is not subject to the restriction from the free portion 59-5. Since it is pushed out by the spring 76 or pushed by the rear projecting portion 67-1 of the second group frame 67, that is, it passes through the intersection with the second group cam follower insertion groove 55-4 by the power of other members. A problem does not occur when the shutter cam follower 75 crosses the intersection with the second group cam follower insertion groove 55-4 while the position of the shutter cam follower 75 is controlled by the cam groove.

It is the perspective view seen from the front direction which shows the camera as Example 1. FIG. FIG. 6 is a development view illustrating a configuration of a cam groove of a cam cylinder in a lens device incorporated in a camera as Example 2. FIG. 6 is a cross-sectional view of a lens device incorporated in a camera as Example 3. It is a half sectional view of the lens device shown by changing the cut end. FIG. 3 is an exploded perspective view showing a diaphragm / shutter unit, a third group unit, and a fourth group unit extracted from the cam cylinder. It is the figure which looked at the part of the aperture stop / shutter unit from the front. It is the figure which looked at the part of 3 group unit from the front. It is the figure which looked at the part of the 4th unit from the front. (a), (b), (c) is a figure which shows operation | movement of a lens apparatus. (a) is a cross-sectional view showing a state of a zoom photographing lens device having a structure in which a conventional diaphragm and shutter member are fixed even when retracted, (b) is a cross-sectional view showing a state when retracted, (c) ) Is a perspective view showing the cam cylinder. It is an expanded view which cut | disconnects the circumferential side surface of the conventional cam cylinder along the straight line parallel to a central axis, and shows an internal peripheral surface. It is a figure which shows the structural example of the cam groove of the cam cylinder inner peripheral surface for moving the conventional aperture_diaphragm | restriction shutter fixed frame at the time of collapse. The structure of the inner peripheral surface of a cam cylinder when the main suspension shaft for a conventional diaphragm / shutter is provided independently at different positions in the rotation direction of the cam cylinder with respect to the third and fourth lens group main suspension shafts is shown. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens barrel 2 Fixed frame 3 Cam cylinder 4 1st group, 2nd group lens support cylinder 5 CCD (charge coupled device)
6 Group 3 and 4th lens main suspension shaft 7 Drive gear 8 Motor 11 First group lens cam groove 12 Second group lens cam groove 12-1 Retracted position 12-2 Wide angle shooting position 12-3 Telephoto shooting position 13 Third-group lens cam groove 13-1 Retracted position 13-2 Wide-angle shooting position 13-3 Telephoto shooting position 14 Fourth-group lens cam groove 14-1 Retractable position 14-2 Wide-angle shooting position 14-3 Telephoto shooting position DESCRIPTION OF SYMBOLS 15 Gear 16 1st group lens support part 17 1st group lens 18 2nd group lens main suspension shaft 19 Cam follower 21 2nd group lens 22 2nd group lens holding member 23 Bearing part 24 Cam follower 25 3rd group lens 26 3rd group Lens holding member 27 Bearing 28 Cam follower 29 Fourth group lens 31 Fourth group lens holding member 32 Bearing 33 Cam follower 34 Aperture / shutter a, b, c Space 35, 36 Cam follower insertion groove 37, 38 Diaphragm / shutter cam groove 37-1, 38-1 Retraction position 37-2, 38-2 Wide angle shooting position 37-3, 38-3 Telephoto shooting position 40 Camera 41 Grasping part 42 Self-timer lamp 43 First group cylinder frame 44 First group lens 45 Zoom lever 46 Shutter button 47 Mode dial 48 Flash 49 Strap mount 51 Protective cover 52 Viewfinder 53 Cam cylinder 54 First group unit cam groove 54-1 Retraction position 54- 2 Wide-angle shooting position 54-3 Telephoto shooting position 54-4 First-group cam follower insertion groove 55 Second-group unit cam groove 55-1 Retraction position 55-2 Wide-angle shooting position 55-3 Telephoto shooting position 55-4 Second-group cam follower insertion groove 56 Group 3 unit cam groove 56-1 Retraction position 56-2 Wide angle shooting position Position 56-3 Telephoto shooting position 57 Group 4 unit cam groove 57-1 Retraction position 57-2 Wide-angle shooting position 57-3 Telephoto shooting position 58 3 / 4-group cam follower insertion groove 59 Diaphragm / shutter cam groove 59-1 Retraction position 59 -2 Wide-angle shooting position 59-3 Telephoto shooting position 59-4 Aperture / shutter cam follower insertion groove 59-5 Free passage portion 60 Lens device 61 Fixed frame 61-1 Aperture / shutter suspension shaft fixing portion 61-2 3/4 group suspension Axis fixing portion 61-3 Sub-suspending shaft fixing portion 62 First group frame 63 First group cam follower 64 Hanging shaft fixing portion 65 Second group main suspension shaft 66 Second group lens 67 Second group frame 67-1 Rear projecting portion 68 Second group bearing portion 69 Second group cam follower 70 Aperture / shutter suspension shaft 71 Aperture / shutter unit 72 Aperture opening 73 Aperture / shutter main bearing 73-1 Stepped portion 74 Aperture / shutter sub-bearing 75 Aperture / Shutter Cam Follower 76 Pushing Spiral Spring 77 Shutter Blade 78 Shutter Motor 79 Aperture Motor 81 3rd and 4th Group Main Suspension Shaft 82 Aperture / Shutter 3rd and 4th Group Secondary Suspension Shaft 83 Third Group Lens 84 Third Group Frame 85-1 3 Group bearing part A
85-2 3rd Group Bearing B
86 4th group lens 87 4th group 2nd frame 88 4th group 1st frame 89-1 4th group bearing part A
89-2 4th Group Bearing B
90 Rotation stop groove 91 3rd group cam follower 92 4th group cam follower 93 4th group second suspension shaft 94 Sleeve 95 Flange 96 Pushing spiral spring 97 Long hole 98 Nut 99 4th group motor 101 Drive screw 102 Optical plate 103 CCD

Claims (9)

A first optical member included in the photographing optical system;
A cam groove for the first optical member that engages with a cam engaging portion of the first optical member and defines a position in the optical axis direction of the first optical member;
A second optical member included in the imaging optical system and used across the first region and the second region;
A cam groove for the second optical member, which passes through the cam engaging portion of the second optical member without engagement in at least a part of the first region; A second optical member cam groove having an engaging portion with which the cam engaging portion of the second optical member is engaged in two regions;
In the first region, the second optical member is biased toward the first optical member, and in the first region, the position of the second optical member in the optical axis direction is the first optical member cam. A biasing member that follows the position of the first optical member defined by the groove;
Along with the cam groove for the first optical member and the cam groove for the second optical member, another cam groove to which a cam engaging portion of another optical member included in the photographing optical system is engaged and the other Cam members each having insertion grooves for loading cam engaging portions of the other optical members into the cam grooves,
The lens device according to claim 1, wherein the insertion groove is formed on the same surface of the cam member as the second optical member cam groove and at a position intersecting the free passage portion . The lens apparatus according to claim 1 , wherein the first area is at least a part of a non-photographing area, and the second area is a photographing area. It said second optical member, the shooting region, the lens apparatus according to claim 2, characterized in that it is defined without a fixed position regardless of the amount of movement of the other optical members. The lens device according to claim 3, wherein the second optical member is a diaphragm or a shutter member. The second optical member is disposed between the first optical member and another optical member, and the first and second optical members and other optical members are moved in the movement from the retracted region to the photographing region. All of the members move in the direction of the subject with respect to the photographic lens device.
The lens apparatus according to claim 4, wherein:   The lens apparatus according to claim 1, wherein the second optical member is released from being urged by the urging member in at least a part of the second region. The lens device according to claim 6 , wherein the urging member is provided along a guide member that guides the movement of the second optical member in the optical axis direction. The lens device according to any one of claims 1 to 7, the lens apparatus characterized by provided an imaging device for imaging. The lens device according to any one of claims 1-8, a camera, characterized in that it comprises a lens apparatus for photographing.

Images