JPH11160609A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera equipped with a zoom focusing lens barrel and a finder interlocking with it and constituted so that a visual field range and a photographing range can be easily and accurately adjusted. SOLUTION: Respective zooming positions 1 to 5 are provided with zooming stop position adjustment ranges shown by arrows and the deviation of the visual field ranges caused by the backlash in assembly and the accuracy error of parts between the zoom lens barrel and the finder is corrected. By adjusting a standby position before photographing sequence (focusing) is started, the visual field rate or the finder is optimized. Besides, since the stop position of zooming is deviated as much as the backlash of a gear when zooming from a wide-angle end side to a telephone end side and when it is reversely executed, it is adjusted so that the visual field ranges become identical and zooming is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a zoom / focus integrated lens barrel and a finder associated therewith.

[0002]

2. Description of the Related Art The viewfinder of a zoom camera performs zooming so as to display an actually photographed area within a field of view.

[0003]

However, in general, the zoom of the viewfinder is driven in conjunction with the zoom of the lens barrel. However, due to the play at the time of the linkage and the error of the viewfinder itself, the range of the visual field is limited. It may shift. If the accuracy of parts and assembly is increased or an adjustment mechanism is provided to prevent this, the cost and size of the product will increase.

On the other hand, in a lens barrel in which zoom and focus are integrally formed by using a step-like cam having a zoom area and a focus area alternately, a standby position of the lens barrel before a photographing sequence (focusing) is started, that is, a camera. The position when the user decides on the composition is different from the position of the lens barrel when actually taking a picture. An object of the present invention is to provide a camera equipped with a zoom / focus integrated lens barrel and a finder associated therewith that solves the above-described problem and provides a configuration that can easily and accurately match a visual field range and a photographing range. With the goal.

[0005]

In order to achieve the above object, the present invention provides a lens barrel for performing a step zooming operation and a focusing operation by a cam mechanism having an area for zooming and an area for focusing alternately. ,
A finder that performs zooming in conjunction with the lens barrel, and adjusts a standby position of the lens barrel before the start of a shooting sequence in each step so as to be in a viewfinder viewing range corresponding to a focal length of each step of the lens barrel. Configuration. Further, the amount of the adjustment is changed between when the lens barrel is driven from the wide-angle end to the telephoto end and vice versa.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view schematically showing a basic configuration of an embodiment of the present invention. As shown in the figure, 1 is a rotary cam cylinder, 2 is a straight-moving cylinder,
Reference numeral 3 denotes a second component frame, 4 denotes a fixed barrel, 5 denotes a camera body, the rectilinear barrel 2 is bayonet-coupled into the rotary cam barrel 1, and the second component ball frame 3 is a rotary cam barrel via the rectilinear barrel 2. 1, the rotary cam barrel 1 is connected to the fixed barrel 4 by a helicoid, and the fixed barrel 4 is screwed to the camera body 5. In the present embodiment, the number of the cylinders is three in comparison with the conventional four, and each of the cylinders includes the second component frame 3 and is coaxial with the optical axis (indicated by a dashed line). Details will be described later.

[0007] A transparent lens barrier 6 for protecting the lens is attached to the front end of the rotary cam barrel 1, and an outer peripheral gear 7 is provided on the outer periphery of the rear end. Is spirally carved so that it is deeper than the gear bottom. As will be described later, the rotary cam barrel 1 is rotationally driven by the driving force received by the outer peripheral gear 7, and is also driven in the optical axis direction by the action of the outer helicoid 8 at that time.

[0008] A first component ball frame 9 is provided at the tip of the rectilinear barrel 2.
A first component lens 10 is provided therein, and a rectilinear cylindrical flange 11 is provided on the outer periphery of the rear end.
Is provided, and several places around it (3 in this embodiment).
(Where), the straight connecting portion 12 protrudes outward. Further, a bayonet flange 13 is provided at a predetermined interval in front of the flange 11, and an escape portion 14 for introducing the rotary cam cylinder 1 is cut out at several places (three places in the present embodiment) around the bayonet flange 13. Has been. And straight cylinder 2
From the front to the rear end, there are provided several straight guides 15 (three in the present embodiment) as cutouts extending to the inner periphery of each flange.

The second component lens frame 3 is provided with a second component lens 16, and cam pins 17 protrude outward at several locations (three in this embodiment). Further, an inner helicoid 18 is provided on the inner periphery of the fixed cylinder 4.
Are spirally protruded inward, and a straight guide 19 is grooved at several locations (three in this embodiment) around the inside from the front to the rear end.

A storage section 20 is provided at one location on the outer periphery of the fixed cylinder 4 along the optical axis direction, and a long driving gear 21 is stored therein. Further, a fixed cylinder flange 22 is provided so as to straddle the outer periphery of the storage part 20 and the fixed cylinder 4, and a shaft 23 attached to the camera body 5 penetrates a shaft hole 22a opened here, The fixed cylinder 4 is positioned on the camera body 5. Further, a drive gear 24 is mounted on the shaft 23, and is prevented from coming off by a gear holding plate 25.

At this time, the window 2 provided in the storage section 20
The driving long gear 21 and the driving gear 24 mesh with each other through 0 '. Finally, the fixing cylinder 4 is fixed to the camera body 5 by screwing a screw 27 that penetrates a stop hole 22b separately formed in the fixing cylinder flange 22 with a boss 26 attached to the camera body 5.

FIG. 2 is a perspective view of the rotary cam barrel 1 as viewed from the rear. As shown in the drawing, the bayonet claw 28 is provided at several places (three places in the present embodiment) on the inner periphery of the rear end of the rotary cam barrel 1.
, And a bottomed cam groove 29 is provided on the inner periphery in front of it. At the time of assembly, the rectilinear barrel 2 shown in FIG. 1 is inserted into the rotary cam barrel 1, and the bayonet claws 28 pass through the introduction escape portions 14 provided on the bayonet flange 13, respectively. Introduced in between. As a result, the rotary cam barrel 1 and the rectilinear barrel 2 are integrally connected in the optical axis direction and freely rotatable. Since the cam groove 29 of the rotary cam cylinder 1 has a bottom,
Unlike the case where a cam is formed on the straight advancing cylinder 2, there is no problem in strength.

On the other hand, the second component ball frame 3 of FIG. 1 is inserted into the rectilinear barrel 2, and the cam pins 17 of the second component ball frame 3 passing through the rectilinear guides 15 of the rectilinear barrel 2 are fitted into the cam grooves 29. , Cam coupling. Thus, the rotation of the rotary cam barrel 1 causes the second component frame 3 to be cam-driven in the optical axis direction.
These assembled units are further inserted into the fixed barrel 4, the outer helicoid 8 of the rotary cam barrel 1 is screwed with the inner helicoid 18 of the fixed barrel 4, and
2 engages with the straight guide 19 of the fixed cylinder 4. At this time,
The outer peripheral gear 7 of the rotary cam barrel 1 is brought into a state of meshing with the long drive gear 21 stored in the storage section 20 of the fixed barrel 4.

As shown in FIG. 5, a bayonet coupling groove is provided on the inner periphery of the distal end portion of the rectilinear barrel 2, and is fitted with a bayonet coupling flange provided on the outer periphery of the distal end portion of the first component ball frame 9. By the combination, the first component ball frame 9 is bayonet-coupled and fixed to the rectilinear barrel 2. Also, the first component ball frame 9
A bayonet coupling flange is provided on the outer periphery on the rear side, and is bayonet-coupled to a later-described shutter unit to hold the shutter. Details will be described later.

The driving long gear 21 rotates while being pivotally supported by the shafts shown in FIG. 6 on the fixed cylinder 4 side and the camera body 5 side, respectively.
The outer peripheral gear 7 is driven, but only one shaft is attached to the inside of the tip of the storage unit 20 on the fixed cylinder 4 side.
The so-called lens barrel unit alone assembled as described above is not supported by the shaft. Therefore, as shown in FIG. 3 as a perspective view of the fixed cylinder 4 as viewed from the rear, a temporary retaining protrusion 30 having flexibility is provided at the rear end of the storage section 20, and the long driving gear 2 is provided.
The workability at the time of assembling and the like is enhanced by retaining the 1. When the lens barrel unit is attached to the camera body 5, the temporary retaining protrusion 30 separates from the long driving gear 21 and does not function.

The operation of the assembled zoom lens barrel at the time of driving will be described. First, the driving long gear 21 is driven to rotate by the driving gear 24 which is driven to rotate by the driving force of a motor (not shown). The outer peripheral gear 7 of the cam barrel 1 is driven to rotate, and the rotary cam barrel 1 rotates. At this time, due to the helicoid coupling between the outer helicoid 8 of the rotary cam barrel 1 and the inner helicoid 18 of the fixed barrel 4, the rotary cam barrel 1 rotates forward (or retreats). Then, the straight moving cylinder 2 moves integrally with the rotary cam cylinder 1 in the optical axis direction.
Since the rectilinear connecting portion 12 is guided rectilinearly by the rectilinear guide 19, only the rectilinear traveling is performed without rotating.

Also, the first component lens frame 9 and the first component lens 1
The first component unit composed of 0 or the like moves integrally with the rectilinear barrel 2. The second component unit including the second component lens frame 3, the second component lens 16, etc.
By the cam mechanism formed by 9 and the rectilinear guide 15 of the rectilinear cylinder 2, it moves in the optical axis direction.

FIG. 4 is a diagram schematically showing a longitudinal section of another example of the zoom lens barrel. The lower half of the optical axis shown by the one-dot chain line is omitted. As shown in the figure, in this example, the rectilinear barrel 2 ′ is located outside the rotary cam barrel 1 ′, and the first component unit 51 and the second component unit 52 are arranged as in the prior art. . In this case, when an external force is applied to the straight-moving cylinder 2 ', this is transmitted to the rotary cam cylinder 1' and transmitted from the rotary cam cylinder 1 'to the fixed cylinder 4' through the helicoid coupling portion. Which is disadvantageous in strength.

On the other hand, in the present embodiment, the rotary cam barrel 1 is located on the outside, and the external force applied thereto is directly transmitted to the fixed barrel 4 through the helicoid joint, so that the strength is reduced. It is advantageous.

FIG. 5 is a side longitudinal sectional view of the zoom lens barrel of the present embodiment. As described in the above basic configuration, a lens barrier 6 is attached to the tip of the rotary cam barrel 1, and the rectilinear barrel 2 is bayonet-coupled to the rotary cam barrel 1 at the rear end. Further, the first component ball frame 9 is fixed in the rectilinear barrel 2 by a bayonet coupling at a portion indicated by an arrow a at a tip thereof, and is provided with a shutter unit 32.
Is the arrow b at the rear end around the outer periphery of the first component ball frame 9.
The portion indicated by is fixed by bayonet connection. Further, the second component ball frame 3 is cam-coupled to the rotary cam barrel 1 via the rectilinear barrel 2 by a cam pin 17.

A first component lens frame 9 has a first component lens 10
G1 and G2 are attached to the second component lens frame 3, and G3 and G4 are attached to the second component lens frame 3 as the second component lens 16. The rotary cam barrel 1 is helicoidally connected to the fixed barrel 4 by an outer helicoid 8 provided at the rear end and an inner helicoid 18 provided on the inner periphery of the fixed barrel 4. 33 is a shutter unit 3
This is a flexible board that electrically couples 2 and the fixed cylinder 4 side.

FIG. 6 is a longitudinal sectional view showing the periphery of the driving long gear 21. As shown in FIG. As shown in the figure, a driving long gear 21 for rotatingly driving the rotary cam barrel 1 is provided in a storage section 20 provided on the outer periphery of the fixed cylinder 4 (not shown), and is directed rearward from the inside of the distal end of the storage section 20. A shaft 34 protruding and a shaft 35 protruding forward from the camera body 5 are pivotally supported in the front and rear. Long drive gear 21
The drive gear 24 meshes with the shaft 23 mounted on the camera body 5 after the shaft 23 attached to the camera body 5 passes through the fixed cylindrical flange 22 provided on the storage portion 20 side, and is prevented from falling off by the gear holding plate 25. Then, it is attached rotatably around the axis.

Conventionally, the force between the driving long gear 21 and the driving gear 24 causes the shaft to open, causing gear tooth jumps and insufficient driving force. In order to prevent this, there is an example in which the gap is not opened by a separate reinforcing member. However, in the present embodiment, the fixed cylindrical flange 22 and the shaft 23 of the drive gear 24 are fitted and firmly connected. Because of the coupling, the gap between the shafts does not open without using a reinforcing member. Further, by fixing the vicinity thereof with a screw or the like shown in FIG. 1, a stronger connection can be obtained.

FIG. 7 is a view showing a part of the zoom lens barrel according to the present embodiment in more detail from the rear, and shows a state where the zoom lens barrel is located at the temporarily retracted end. As shown in the figure, three bayonet claws 28a, 28b, and 28c are provided on the inner periphery of the rotary cam barrel 1 at substantially equal heights, and the bayonet flanges 13 of the rectilinear barrel 2 are indicated by broken lines. It corresponds to the introductory escape portions 14a, 14b, 14c cut out at three places around. Further, an outer peripheral gear 7 is provided on the outer periphery of the rotary cam barrel 1, and as shown in the upper left of FIG.
Are engaged.

The bayonet claws 28a, 28b, and 28c and the introduction escape portions 14a, 14b, and 14c have different widths and heights at their respective locations. Therefore, the bayonet claws except when they match the corresponding portions. Will engage with any position around the introduction escape portion, and each claw will not come off the bayonet flange of the rectilinear barrel 2. Therefore, even when the rotary cam barrel 1 rotates nearly one rotation, the respective barrels are kept integrally in the optical axis direction and do not tilt with each other.

After assembling the fixed barrel 4 (not shown), the rotary cam barrel 1 and the rectilinear barrel 2, the rotary cam barrel 1 is rotated by a rotation amount indicated by an arrow c, and in this state, the drive long gear 21 is rotated.
When the camera is inserted from behind, the drive long gear 21 interferes with the non-gear part of the outer peripheral gear 7 of the rotary cam barrel 1, that is, the unnecessary part as a gear part when using the camera, as shown by the arrow d. Cannot rotate to the wide (wide-angle end) side indicated by the arrow W, so that it becomes a temporary retracting stopper, and the rotating cam barrel 1 and the rectilinear barrel 2 do not come off from the fixed barrel 4, so that the workability at the time of camera assembly is improved. Will be better.

The retracted position when the camera is used is located on the tele (telephoto end) side indicated by an arrow T in the figure from the above state, and is regulated by a stopper provided on the camera body 5 (not shown). Since the drive long gear 21 is also temporarily fixed as described above in a single unit state of the zoom lens barrel, the unit cannot be disassembled carelessly, which is more convenient.

FIG. 8 is a view showing a case where the bayonet claw and the escape portion for its introduction are formed in a shape different from that of FIG. As shown in the figure, the bayonet claws 28'a, 2 of the rotary cam barrel 1
8'b, 28'c and the escape recesses 14'a, 14'b, 14'c of the flange 13 of the rectilinear barrel 2 are formed in a U-shape or have a smaller width. This is advantageous in terms of radial space. In addition, as in FIG. 7, the shapes of the claws and the introduction escape portions are not separated except when the corresponding portions match, and the same effect can be obtained.

FIG. 9 and FIG. 10 are diagrams schematically showing the main part of the bayonet connection at the front of the rectilinear barrel 2 and the first component frame 9, respectively. FIG. 9A shows a state in which the rectilinear barrel 2 is viewed from the front, and object-side ribs A and film-side ribs B are alternately arranged at three locations on the inner periphery thereof. This is seen from the side vertical section, as shown in FIG. 2B, in which the bayonet flange 38 of the first component frame 9 is fixed by being press-fitted between the ribs A and B. It is to be noted that the lower half from the optical axis shown by the one-dot chain line in this figure is omitted.

When mounting, the first component frame 9 is fitted into the rectilinear barrel 2 at the rotational position as shown in FIG. 10A, and the bayonet flange 38 is brought into contact with the film side rib B.
Furthermore, a shutter outer peripheral convex portion 39 of the shutter unit 32 described later attached to the first component ball frame 9 is inserted into the escape portion 37 of the rectilinear barrel 2, and the first component ball frame 9 is moved rightward as shown in FIG. When rotated, the tip of each bayonet flange 38 indicated by the arrow abuts on the positioning contact of the subject side rib A indicated by the broken line in FIG.
Is fixed to the rectilinear cylinder 2.

Further, the shutter outer peripheral convex portion 39 is located at a position adjacent to the rotation regulating convex portion 36 provided on the inner periphery of the rectilinear barrel 2 on the counterclockwise side, so that the first component ball frame 9 is formed.
Shutter unit 32 (not shown) attached to
Is restricted from rotating clockwise.

FIG. 11 and FIG. 12 are views schematically showing main parts of the bayonet connection at the rear of the shutter unit 32 and the first component frame 9, respectively. FIG. 11A shows a state in which the shutter unit 32 is viewed from the front, and it can be seen that the subject side ribs A ′ and the film side ribs B ′ are alternately arranged at three locations on the inner periphery thereof. This is as shown in FIG. 2B when viewed from the side longitudinal section, in which the bayonet flange 41 of the first component frame 9 is inserted between the ribs A ′ and B ′. It is to be noted that the lower half from the optical axis shown by the one-dot chain line in this figure is omitted.

When mounting, the shutter unit 32 is rotated at the rotational position of the first component frame 9 as shown in FIG.
When the first component frame 9 is rotated clockwise as shown in FIG. 11 (b), the tip of each bayonet flange 41 indicated by an arrow is moved to the position shown in FIG. In (a), the first component frame 9 is positioned in the shutter unit 32 by abutting the positioning rib of the subject side rib A 'shown by the broken line. FIG.
The function of the shutter outer peripheral projection 39 shown in FIG. 1 is as described above. Incidentally, reference numeral 40 shown in FIG. 11B denotes shutter blades.

In this state, when the first component frame 9 is fixed to the rectilinear barrel 2 by press fitting as described with reference to FIGS. 9 and 10, the shutter unit 32 rotates counterclockwise. Can not be done. On the other hand, on the clockwise side of the shutter outer peripheral convex portion 39, the rotation restricting convex portion 36 of the rectilinear barrel 2 is provided.
Are adjacent to each other, so that the shutter unit 32 can rotate clockwise only by the gap. This restricts the rotation of the shutter unit 32,
The bayonet connection is not lost and the component frame 9 does not fall off.

Incidentally, it is conceivable to fix the first component ball frame 9 by pressing it into the shutter unit 32,
In general, a shutter has a configuration in which shutter blades having low rigidity are driven by a weak force. Therefore, if distortion or deformation is caused by press-fitting or the like, a shutter failure may occur. Also, it is conceivable to fix it by bonding,
In this case, the adhesive flows into the vicinity of the shutter blade, and there is a possibility that the shutter may fail to open and close. Therefore, with the above configuration, the shutter itself is positioned and fixed without applying any extra force.

FIGS. 13A and 13B schematically show a helicoid coupling portion. FIG. 13A is an enlarged view of a longitudinal section, and FIG. 13B is a developed view of the inner surface of a fixed cylinder. As shown in (a), the inner helicoid 18 provided on the inner periphery of the fixed barrel 4 and the outer helicoid 8 engraved at several places around the outer peripheral gear 7 provided on the outer periphery of the rear end of the rotary cam barrel 1. Screwed and helicoidally connected. At this time, since the rotary cam cylinder 1 is generally a resin molded product, the bottom of the outer helicoid 8 is made deeper as shown by a two-dot chain line at the beginning of the mold manufacturing, and later the tip of the inner helicoid 18 is later formed. The thickness is increased by shaving the mold so as to reduce the gap between them and the rattling is prevented. The dashed line is the pitch diameter of the outer peripheral gear 7.

However, if the bottom of the outer helicoid 8 is shallower than the bottom of the outer peripheral gear 7 indicated by the broken line in FIG.
They need to be the same depth or even deeper. In this case, the bottom of the outer helicoid 8 after the merging substantially coincides with the tip of the inner helicoid 18, but the merging is performed on the side of the outer helicoid 8, so the final position is determined by the tip of the inner helicoid 18. .

The fixed cylinder 4 and the rotary cam cylinder 1 are separate parts.
However, since it is difficult to match the tip of the inner helicoid 18 with the bottom of the outer peripheral gear 7, it is better to set the tip of the inner helicoid 18 on the fixed cylinder 4 side as inside as possible. If the bottom of the outer helicoid 8 is set to be deeper than the bottom of the outer peripheral gear 7 in accordance with this concept, an effect of stopping external light passing through the bottom of the gear can be obtained.

The light-shielding line 42 provided on the inner periphery of the fixed cylinder 4 is usually perpendicular to the optical axis direction indicated by an arrow as shown in a developed view of the inner surface of the fixed cylinder 4 in FIG. Therefore, a clearance with the front end of the outer peripheral gear 7 is absolutely necessary. However, as shown in FIG. 14A, a light shielding line escape portion 43 is provided at the front end of the outer peripheral gear 7, and FIGS. As shown in the development view of c), the light shielding line 42 is made parallel to the inner helicoid 18 and the light shielding line escape portion 43 is made parallel to the outer helicoid 8 without using the optical axis direction indicated by the arrow as a reference. With such a shape, the clearance can be reduced and the lens barrel diameter can be reduced.
Since the strength of the gear is determined by the root of the gear, there is no problem in the strength even if the gear width at the tip of the outer peripheral gear is reduced.

FIG. 15 is a developed view of the inner peripheral surface of the rotary cam barrel 1. FIG. As shown in the figure, a cam groove 29 is provided on the inner peripheral surface of the rotary cam barrel 1, and the cam pins 17 of the second component frame 3 are fitted and cam-coupled as described above. . Thereby, the second component frame 3 is cam-driven in the optical axis direction by the rotation of the rotary cam barrel 1. In this case, paying attention to the cam grooves in the figure, the range indicated by the parentheses is the portion that is responsible for the focus operation, and the rest is the portion that is responsible for the zoom operation. That is, the cam mechanism has a zoom region and a focus region alternately.

The portion responsible for this focus operation has the same inclination as the inner helicoid 18 on the inner peripheral surface of the fixed cylinder 4 and is in the opposite direction. Therefore, the second component ball frame 3 is
Move in the opposite direction by the same amount as the movement amount in the optical axis direction. That is, it is stationary with respect to the fixed cylinder 4. At that time, the first component frame 9 moves integrally with the rotary cam barrel 1, so that focusing is performed.

Using such a step-like cam, zoom,
In a lens barrel having an integrated focus, zoom and focus are driven by the same mechanism. In such a lens barrel, compared to a conventional lens barrel in which only a focusing lens is moved by another driving source to focus.
Since a large member is driven at the time of focusing, there is a problem that the release time lag tends to increase due to inertia or the like. If a drive system capable of driving at high speed is provided to improve this, the zoom operation becomes too fast, and it becomes difficult to set an appropriate angle of view when using the camera.

Therefore, in the present embodiment, after providing a driving system capable of driving at the high speed, control based on the flowchart shown in FIG. 16 is performed so that driving during zooming is slower than driving during focusing. doing. As shown in the drawing, when the photographing operation is started, first, in step # 5, it is determined whether or not the user has pressed the tele (telephoto side) zoom switch. Move to 10. Next, step # 10
, It is determined whether or not the wide (wide-angle side) zoom switch is pressed, and if not, step # 1 is performed.
Move to 5. Then, in step # 15, it is determined whether or not the release switch has been pressed, and if not, the process returns to the beginning.

If it is determined in step # 5 that the telezoom switch has been pressed, the process proceeds to step # 20, and the lens barrel is slowly driven in the telephoto direction. Continue with step # 25
In, it is determined whether or not the telezoom switch has been turned off. If not, the flow returns to step # 20 to continue driving. When the telezoom switch is turned off in step # 25, the process returns to the beginning.

In step # 10, if the wide zoom switch is depressed, the process proceeds to step # 30, and the lens barrel is slowly driven in the wide direction. Subsequently, in step # 35, it is determined whether or not the wide zoom switch has been turned off. If not, the process returns to step # 30 to continue driving. If the wide zoom switch is turned off in step # 35, the process returns to the beginning.

In step # 15, if the release switch is depressed, the flow proceeds to step # 40 to perform distance measurement and photometry. Subsequently, in step # 45, the lens barrel is driven at full speed based on the distance measurement data. After the focus operation is performed, the operation is stopped, and the photographing is performed in step # 50. Finally, in step # 55, the lens barrel is moved at full speed, stopped at the standby position, and the processing ends. The control of the driving speed and the stop is performed by PWM control. Further, when the power supply voltage is lowered, the zoom speed is made relatively faster than the focus speed as compared with the normal time.

However, in practice, each of the above zoom switches is turned off.
When it becomes F, it does not stop driving immediately and return to the beginning,
The driving is continued until a predetermined position of a step zoom described later is reached. This flowchart also includes those operations not specifically shown.

FIG. 17 is an exploded perspective view showing the structure of the zoom finder used in the present embodiment. As shown in the figure, finder zoom lenses FG1 and FG2 are arranged in the optical axis direction on a long portion of a substantially L-shaped box-shaped base plate 61, and slide in the optical axis direction by a guide shaft 62. It is movably mounted. Each finder zoom lens is always given a force to attract each other by a biasing spring 63. A rotating cam plate 64 is rotatably attached to the lower surface of the base plate 61 by a stop pin 65, and a G1 cam groove 64a and a G2 cam groove 64b provided around the rotation center on the upper surface thereof.
The cams are coupled by fitting the projections extending downward from the finder zoom lenses FG1 and FG2, respectively.

The mirror 66, the eyepiece 67, and the condenser lens 68 are mounted at predetermined positions on the base plate 1, respectively. Further, on the side surface of the base plate 61, a C, H, P (classical, high-vision, panoramic size) switching mechanism 69 for changing the shape of the finder screen is provided.
Is attached, and the reversing prism 70 is
Is mounted.
Finally, the lid 72 is attached to the upper surface of the base plate 61.

In this state, the rotary cam plate 64 rotates in the direction of the arrow T (telephoto end) or the direction of W (wide angle end) in conjunction with the drive gear 24 on the zoom lens barrel side, so that the finder zoom lenses FG1 and FG2 are rotated. It is driven in the direction of the optical axis so as to approach and move away from each other, and the angle of view of the finder changes in accordance with zooming. Light from the subject incident on the finder passes through the finder zoom lenses FG1 and FG2, is reflected by the mirror 66, passes through the condenser lens 68, passes through the C, H, P switching mechanism 69, and is turned over by the reversing prism 70. And finally reach the user's eye through the eyepiece 67.

Further, a finder zoom lens FG
1 and FG2, the guide pieces Fa, which protrude from the corners,
The configuration in which Fb slides while being pressed against the rotation stop rail surface 73 provided on the base plate 61 by an elastic member (not shown) prevents rotation of the finder zoom lenses FG1 and FG2. Further, by using this mechanism, it is possible to correct parallax, which will be described later.

FIG. 18 is a perspective view schematically showing the appearance of the lens shutter camera according to the present embodiment. In the figure, reference numeral 74 denotes a zoom lens barrel, 75 denotes a finder window, 76 denotes the above-described release switch, and T and W.
Denotes a tele-zoom switch and a wide-zoom switch, respectively. Reference numeral 77 denotes a mode switch, which will be described later, and has a function of switching between a normal mode, a macro mode, and a landscape mode.

FIG. 19 is a block diagram showing a control system of the lens shutter camera according to the present embodiment. In the figure, a CPU is a control unit composed of, for example, a microcomputer, in which a release switch 76,
A tele-zoom switch T, a wide-zoom switch W, and a mode switch 77 are connected. The release switch 76 is set to S in accordance with the state of half-press and full-press, respectively.
It switches to two stages, 1 and S2. Further, the motor M
Rotate to drive the zoom lens barrel and the finder.

For example, the frequency at which a rotating blade (not shown) interlocked with the rotation of the motor M blocks the light flux of the photo interrupter (not shown) is determined by a motor rotation amount detector 79.
, And the information is transmitted to the CPU. Further, the position of the zoom lens barrel is detected by a position detection switch 80 described later, and information is transmitted to the CPU. With these configurations, control of a finder and a zoom lens barrel, which will be described later, is performed.

FIG. 20 is a view showing a state in which the position detection switch 80 is provided on the zoom lens barrel of the present embodiment.
(A) is a plan view, (b) is a side vertical sectional view. The configuration of the zoom lens barrel is substantially the same as that shown in FIG. In the case of FIG. 20, the upper part of the fixed cylinder 4 is cut out in the axial direction so that the position detection switch 80 is attached.

The position detection switch 80 includes a first contact piece 82 and a second contact piece 84 arranged along the fixed cylinder 4.
The first contact piece 82 has a substantially ladder-like shape as shown in FIG. 3A, and a plurality of through holes 87 and transverse portions 86 are alternately arranged in the axial direction. The through hole 87 and the crossing portion 8
6, a switch projection 8 of the rectilinear barrel 2 shown in FIG.
1 moves with the driving of the zoom lens barrel. When the switch projection 81 comes into contact with the cross section 86, the first contact piece 82 is pushed up, and the rear end 83 is separated from the rear end 85 of the second contact piece 84 to be in a non-conductive state.

On the other hand, when the switch projection 81 is located in the through hole 87, the first contact piece 82 returns to the original position and becomes conductive with the second contact piece 84. Cross section 86 and through hole 87
Are arranged corresponding to each of the zoom region and the focus region of the zoom lens barrel shown in FIG.

FIG. 21 shows a finder cam curve of the zoom finder shown in FIG. 17, in which the first component lens 10 of the photographing optical system (zoom barrel) is linear, that is, the movement amount with respect to the rotation amount is constant. It corresponds to the focal length of the case. Here, the horizontal axis indicates the cam rotation amount of the rotary cam plate 64, and the vertical axis indicates the viewfinder zoom lens (FG1, F2).
The movement amount of G2) is taken. The numbers 1 to 5 shown on the horizontal axis indicate the respective positions of the step zoom.
Each stage is from IDE (wide-angle end) to TELE (telephoto end). Since it does not stop between the positions, it is not used for checking the composition.

In the zoom of the photographing optical system, a zoom curve is set so as to be convenient for the zoom lens barrel. As shown in FIG. With this configuration, when shifting from the position 1 to the position 2, the pressure angle of the cam driving the FG1 indicated by the circle in the figure becomes too large, the driving torque of the finder zoom lens is increased, the driving is poor, and the finder image shakes. Etc. Therefore, as shown in parentheses in FIG.
By making the finder cam curve 1 substantially straight, it is effective to smooth the pressure angle, and particularly to eliminate the portion where the pressure angle is large.

Since the positions between the respective positions are not used for confirming the composition, the zoom operation of the finder between the steps can be constituted independently of the zoom operation of the zoom lens barrel. Even with such a configuration, there is no practical problem. Note that the FG2 is configured to operate in accordance with the movement of the FG1 so that the diopter of the finder becomes constant.

FIG. 23 shows the FG at each zoom position.
FIG. 7 is a diagram illustrating a zoom stop position adjustment range in a finder cam curve indicating a normal position of FG2. In the lens barrel of the type in which zooming and focusing are performed by the lens barrel cam as shown in this embodiment, the position detection switch 8
To perform focusing by driving the lens barrel based on 0,
The stop position of the lens barrel before the start of the imaging sequence does not affect the imaging result. Therefore, regarding the imaging system, the zoom stop position is free as long as the reference switch 80 can be detected.

Therefore, in each of the zoom positions 1 to 5, a zoom stop position adjustment range as shown by an arrow is provided, and the range of the visual field range due to play in the assembly between the zoom lens barrel and the finder and the accuracy error of the parts is determined. The gap can be corrected. Therefore, by adjusting the standby position before the start of the photographing sequence (focusing), the field of view of the viewfinder can be optimized. In addition, when zooming from the wide-angle end to the telephoto end, and vice versa, the stop position is shifted by the amount of play such as gear backlash, so adjust the stop position so that the field of view is the same, and stop zooming. Let it.

FIG. 24 is a block diagram showing how the zoom stop position is adjusted. As shown in the figure, the chart 93 is observed by the adjusting camera 92 from the finder eyepiece 75 'through the finder window 75 of the camera body 91, and the obtained data is sent to the adjuster 94, where the correction amount is calculated. Then, the stop position of the zoom lens barrel 74 is adjusted by writing the data in the ROM in the camera body 91. As a specific procedure, as shown in a flowchart of FIG.
The finder magnification is measured, and the correction amount of the zoom stop position based on the finder magnification is calculated and written to the ROM.
In this case, adjustment may be performed one by one at the time of camera production, or products assembled with parts using the same mold may be regarded as equivalent, and the same data may be written in all the products.

FIG. 26 shows the FG at each zoom position.
FIG. 3 is a view showing a zoom standby position in each mode on a finder cam curve indicating a normal position of FG2. When taking close-ups in macro shooting, the shooting range is smaller than in normal shooting, so the actual shooting range is displayed in the viewfinder frame. Wait on the telephoto side than usual, as indicated by the long arrow. Conversely, when shooting at infinity in landscape shooting, the shooting range is wider than in normal shooting, so the actual shooting range is displayed in the viewfinder field frame. Stand by on the wider angle side than usual, as indicated by the short arrow in the figure with respect to the position.

That is, a photographing sequence (focusing)
In the macro mode, the stand-by position before the start is set to the telephoto side to adjust the field of view, and in the landscape mode, the field of view is set to the wide-angle side to adjust the field of view. FIG. 27 is a flowchart showing the procedure of zoom standby. When the photographing operation is started, first, in step S5 of the figure, it is checked whether any of various switches such as the release switch 76, the zoom switches T and W shown in FIG. If it is not ON, the process proceeds to step S10. In step S10, it is determined whether or not the mode is the macro mode by the mode changeover switch 77 shown in FIG. 18, and if the mode is the macro mode, the process proceeds to step S15.

In step S15, it is determined whether or not the current zoom lens barrel standby position is the macro standby position. If not, the process proceeds to step S20, in which the zoom lens barrel is moved to the macro standby position. Return. Step S
If it is a macro standby position at 15, the process returns to the beginning. In step S5, if any of the various switches is ON, the process proceeds to step S25, and returns to the beginning after performing each sequence operation. If the sequence is zoom, the camera stops at a position corresponding to the mode. In step S10,
If not in the macro mode, the process moves to step S30.

In step S30, it is determined whether or not the mode is the landscape mode by the mode changeover switch 77. If the mode is the landscape mode, the process proceeds to step S35. In step S35, it is determined whether or not the current zoom lens barrel standby position is the landscape standby position. If not, the process proceeds to step S40, where the zoom lens barrel is moved to the landscape standby position and the process returns to the beginning. If it is a landscape standby position in step S35, the process returns to the beginning. Step S30 above
In step S45, the process proceeds to step S45.

In step S45, it is determined whether or not the current zoom lens barrel standby position is the normal standby position. If not, the process proceeds to step S50, in which the zoom lens barrel is moved to the normal standby position, and firstly, Return. If it is the normal standby position in step S45, the process returns to the beginning.

In the case of a so-called tele macro configuration in which the mode can be switched to the macro mode only at the telephoto end instead of performing the mode switching in the entire range as described above, the finder cam curve becomes as shown in FIG. In the tele macro state indicated by an arrow from the end, a viewfinder cam can be used to narrow the field of view and the diopter can be adapted to a short distance.

FIG. 29A is a view showing a viewfinder cam curve when the field of view with respect to the photographing range and / or the diopter with respect to the photographing distance are adjusted in conjunction with the focusing operation of the zoom lens barrel. In the figure, the broken line indicates the original zoom curve, and the solid line indicates the finder cam curve of the present embodiment. Generally, the angle of view of a photographing lens changes depending on the photographing distance (focus position). On the other hand, in the lens barrel-finder system of the present embodiment, the finder cam is also driven when focusing is performed. Therefore, by setting the finder cam to an angle of view and / or a diopter corresponding to the shooting distance, it is possible to further improve the finder cam. It is possible to show a finder image with an accurate angle of view and / or diopter.

As shown in FIG. 19, the release switch 76 has two stages, S1 and S2. By performing the focus operation in the half-pressed state of S1, the composition is improved in a more correct visual field range and diopter. You can make a decision. However, during normal zooming, if zoom drive is performed at a constant speed as it is,
The viewfinder magnification fluctuates discontinuously, giving the user discomfort. Therefore, as shown in FIG. 3B, it is possible to control the driving speed of the finder zoom so that the change in magnification becomes smooth.

Further, during the focusing operation, the finder lens may be decentered to correct the parallax (parallax). This is because the rotation stop rail surface 73 shown in FIG. 17 is processed into a waveform as shown in FIG.
A finder zoom lens FG1 (or F
By sliding the guide piece Fa (or Fb) of G2), the finder zoom lens FG1 (or FG2) is centered on the guide axis corresponding to focusing from infinity to proximity at each of the positions 1, 2, 3,. It is intended to correct the parallax between the zoom lens barrel and the finder according to the photographing distance by rotating the lens barrel to decenter it.

By the way, the lens barrier 6 may have a function of a conventional aperture plate or decorative sheet. FIG. 31 is an enlarged side vertical sectional view of the front portion of the lens barrel shown in FIG. 5 and shows a configuration in which another function is added to the lens barrier 6. That is, on the film side of the lens barrier 6 attached to the tip of the rotary cam barrel 1, in other words, on the surface on the lens side (so-called back surface), the inner surface of the mounting part of each component in the lens barrel is covered and the appearance quality is reduced. A backside printing 6 ′ for heightening is provided in a ring shape, and an optical opening indicated by an aperture diameter S is provided around the optical axis at the center thereof.
It also has the function of the conventional diaphragm plate and decorative sheet.

Further, an adhesive 6 ″ is applied to the film-side surface of the back side printing 6 ′, so that the lens barrier 6 can be attached to the rotary cam barrel 1 with one touch. 32 (a) is a front perspective view, FIG.32 (b) is a rear perspective view, and FIG.32 (c) is a front view. As described above, "ZOOM LENS"
The appearance quality can be further improved by giving a description of the lens such as "38-115 mm" or a mark such as a manufacturer name or a camera name. With the configuration described above, the number of parts and the number of assembling steps in the lens barrel can be reduced, and the size can be reduced mainly in the optical axis direction. Instead of printing on the lens barrier 6, a conventional decorative sheet may be printed to serve as an aperture.

The configuration relating to the claims in the present embodiment is shown in FIG. 23 showing a zoom stop position adjustment range. In the lens barrel of the type in which zooming and focusing are performed by the lens barrel cam as shown in the present embodiment, at the time of photographing, focusing is performed by driving the lens barrel based on the position detection switch 80. The stop position of the lens barrel does not affect the imaging result. Therefore, regarding the imaging system, the zoom stop position is free as long as the reference switch 80 can be detected.

Therefore, in each of the zoom positions 1 to 5, a zoom stop position adjustment range as shown by an arrow is provided, and the range of the visual field range due to play in the assembly between the zoom lens barrel and the finder and the accuracy error of the parts is determined. The gap can be corrected. Therefore, the configuration is such that the field of view of the finder is optimized by adjusting the standby position before the start of the shooting sequence (focusing). In addition, when zooming from the wide-angle end to the telephoto end, and vice versa, the stop position is shifted by the amount of play such as gear backlash, so adjust the stop position so that the field of view is the same, and stop zooming. Let it.

The state of the zoom stop position adjustment is as follows.
24 is shown in the block diagram of FIG.
Then, the chart 93 is observed by the adjustment camera 92, and the obtained data is sent to the adjuster 94, where the correction amount is calculated and written into the ROM in the camera body 91, so that the stop position of the zoom lens barrel 74 can be determined. It is a configuration for adjusting.

[0078]

As described above, according to the present invention,
In a camera having a zoom / focus integrated lens barrel and a finder linked thereto, it is possible to provide a configuration that can easily and accurately match the visual field range and the photographing range.

In particular, according to the first aspect, the deviation of the visual field range due to the play in assembly between the zoom lens barrel and the finder or the accuracy error of the parts is corrected by the zoom position stop adjustment range in each zoom position. Can do things.
According to the second aspect, the field of view is the same even when the stop position is shifted by backlash such as gear backlash when driving from the wide-angle end to the telephoto end and vice versa. Can be adjusted.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view schematically showing a basic configuration of an embodiment of the present invention.

FIG. 2 is a perspective view of the rotary cam barrel as viewed from the rear.

FIG. 3 is a perspective view of the fixed cylinder as viewed from the rear.

FIG. 4 is a diagram schematically showing a longitudinal section of another example of a zoom lens barrel.

FIG. 5 is a side longitudinal sectional view of the zoom lens barrel of the embodiment.

FIG. 6 is a longitudinal sectional view showing the vicinity of a long driving gear.

FIG. 7 is a view of a part of the zoom lens barrel according to the present embodiment viewed in more detail from behind.

FIG. 8 is a diagram showing a case in which the bayonet claw and the escape portion for introducing the same are formed in different shapes.

FIG. 9 is a view schematically showing a main part of a straight-moving cylinder connected to a bayonet.

FIG. 10 is a view schematically showing a main part of a bayonet connection at a front part of a first component ball frame.

FIG. 11 is a view schematically showing a main part of a bayonet connection of the shutter unit.

FIG. 12 is a view schematically showing a main part of a bayonet connection at a rear part of the first component ball frame.

FIG. 13 is a diagram schematically showing a helicoid joint.

FIG. 14 is a diagram schematically showing a helicoid coupling portion when a light-shielding line escape portion is provided.

FIG. 15 is a development view of the inner peripheral surface of the rotary cam barrel.

FIG. 16 is a flowchart illustrating drive control during zooming and during focusing.

FIG. 17 is an exploded perspective view showing the configuration of a zoom finder.

FIG. 18 is a perspective view schematically showing the appearance of a lens shutter camera.

FIG. 19 is a block diagram showing a control system of the lens shutter camera.

FIG. 20 is a diagram showing a state where a position detection switch is provided on the zoom lens barrel.

FIG. 21 is a diagram illustrating a finder cam curve of a zoom finder.

FIG. 22 is a diagram illustrating a state in which a pressure angle of a finder cam curve is smoothed.

FIG. 23 is a diagram illustrating a zoom stop position adjustment range of a finder cam curve.

FIG. 24 is a block diagram showing how a zoom stop position is adjusted.

FIG. 25 is a flowchart showing a zoom stop position adjustment procedure.

FIG. 26 is a diagram illustrating a zoom standby position of a finder cam curve.

FIG. 27 is a flowchart showing the procedure of zoom standby.

FIG. 28 is a view showing a finder cam curve in a configuration of a tele macro.

FIG. 29 is a diagram illustrating an example that is linked to the focusing operation of the zoom lens barrel.

FIG. 30 is a diagram showing a state in which a rotation stopping rail surface is processed into a waveform.

FIG. 31 is a side longitudinal sectional view showing a configuration in which another function is added to a lens barrier.

FIG. 32 is a diagram illustrating an appearance of a lens barrier to which a function is added.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating cam cylinder 2 Straight barrel 3 Second component ball frame 4 Fixed barrel 5 Camera body 6 Lens barrier 7 Outer gear 8 Outer helicoid 9 First component ball frame 10 First component lens 11 Straight barrel flange 12 Straight coupling part 13 For bayonet Flange 14 Introductory escape portion 15 Straight guide 16 Second component lens 17 Cam pin 18 Inner helicoid 19 Straight guide 20 Storage section 21 Long drive gear 22 Fixed cylinder flange 23 Shaft 24 Drive gear 25 Gear holding plate 26 Boss 27 Screw 28 Bayonet Claw 29 Cam groove 30 Temporary retaining protrusion 32 Shutter unit 33 Flexible substrate 34, 35 Shaft 36 Rotation restricting protrusion 37 Relief portion 38, 41 Bayonet flange 39 Shutter outer peripheral protrusion 42 Light-shielding line 43 Light-shielding line relief 61 Base plate 62 Guide shaft 63 biasing spring 4 Rotating Cam Plate 65 Stop Pin 66 Mirror 67 Eyepiece Lens 68 Condenser Lens 69 C, H, P Switching Mechanism 70 Inverting Prism 71 Prism Holder Plate 72 Cover 73 Rotation Stop Rail Surface 74 Zoom Lens Bar 75 Finder Window 76 Release Switch 77 Mode Changeover switch 78 Motor driver 79 Motor rotation amount detector 80 Position detection switch 81 Switch protrusion 86 Crossing part 87 Through hole 91 Camera body FG1, FG2 Finder zoom lens T Telezoom switch W Wide zoom switch M Motor CPU controller

Claims (2)

[Claims] 1. A lens barrel for performing a step zoom operation and a focusing operation by a cam mechanism having an area for zooming and an area for focusing alternately, and a finder for zooming in conjunction with the lens barrel,
A camera, wherein a standby position of the lens barrel before the start of a shooting sequence in each step is adjusted so as to be within a viewfinder viewing range corresponding to a focal length of each step of the lens barrel. 2. The amount of the adjustment is changed between when the lens barrel is driven from the wide-angle end to the telephoto end and when the lens barrel is driven from the telephoto end to the wide-angle end. 2. The camera according to 1.