JPH0248613A - Close-up photographing device - Google Patents

Abstract

PURPOSE:To change photographing magnification without moving the position of a camera and to improve operability by detecting the extension and contraction quantity of an intermediate device as the moving quantity of a photographic lens mount part obtained by taking the position of a photographic camera mount part as a starting point and moving a lens based on the detected moving quantity. CONSTITUTION:In an intermediate device B, a camera mount supporting member 52 and a photographic lens mount supporting member 51 which can relatively separate and approach in an optical axis direction are connected by a bellows 69 so that they can freely extend and contract. A focal distance variable photographic lens A is mounted and held on the lens mount part 51 and the camera C is mounted on the camera mount member 52 in the intermediate device B. In such a state, when the lens mount member 51 is made to extend and contract along a guide rail 50 in order to set the photographing magnification as desired one, the extension and contraction quantity is detected as the moving quantity obtained by taking the position of the camera mount member 52 as the starting point by a cam mechanism and the change of a focal distance is performed in lens groups L1-L4 and a diaphragm D based on the detected moving quantity. Thus, the photographing magnification is changed without changing the photographing distance from an object surface to an image-formation surface.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a close-up photographing device used for close-up or enlarged photographing of a photographic subject using a camera.

(Conventional Technique #r) Conventionally, when performing so-called close-up photography with a magnification of more than 0.2x and up to around 10x, an intermediate device has been used to widen the distance between the camera and the photographic lens. . Generally, the intermediate device used is a bellows-type feeding device that telescopically connects the camera mounting part and the photographic lens mounting part with a light-shielding bellows, or a so-called intermediate tube that is interposed between the camera and the photographic lens. has been done. The shooting magnification is determined by the amount of extension of the #i shadow lens, so
In the case of the former bellows type, the amount of extension IM of the bellows is adjusted, and in the case of the latter tube, the desired imaging magnification is obtained by changing the length of the tube.

FIGS. 4(a), 4(b), and 4(c) are diagrams showing a correlation model between the extension amount d of the photographing lens and the photographing magnification β.

L is a photographing lens with a focal length of 1f, F is a film plane as an imaging plane, Y is a subject, Y is a formed image, and a is a subject distance #
(Photographing lens LM object Y0 open circuit! 11), b! i Image distance maintenance distance * Shadow shadow L - Imaging surface F open path 1m), u is shooting distance m
<Subject Y. 4-4 distance between image planes F (Jl).

(a) In the figure, the amount of extension of the photographing lens L is d = 0, that is, the focus of the lens L is located on the imaging plane F, and the photographing magnification β = 110.
The case of o is shown. Figures (b) and (C) each show the lens L extended, and the photographic magnification β is approximately 1x in Figure (b) and 2x in Figure (C).

The photographing magnification β, the photographing distance @Il, and the subject distance a are each expressed by the following relational expressions.

β=Y/Y0 =b/a=d/f ・ ・ ・ (1)
1=f (1+β)2/β ・ ・ ・ ・ ・
(2) a=f (1+1/β) ・ ・ ・ ・
(3) From equation (1), the photographing magnification β is proportional to the lens extension id, so in order to obtain the desired 2 magnification β, the lens extension id d must be adjusted in size. Specifically, as mentioned above, a bellows-type or tube-type feeding device is interposed between the camera and the photographing lens, and by adjusting the amount of expansion and contraction of the bellows and changing the length of the tube, it is possible to take pictures with respect to the camera (focal plane of the camera). JF and shadows are performed at a desired imaging magnification β by adjusting the amount of lens extension.

(Problems to be Solved by the Invention) However, in conventional simple bellows-type or tube-type feeding devices, when the photographing magnification β is changed, the photographing distance 1u changes. Therefore, it is necessary to perform an operation to change the camera position at the same time.

That is, when the wL shadow magnification β is changed by changing the lens extension d, the photographing distance 1 changes according to equation (2). This is subject Y. This means that the distance aIt from to the film plane F, that is, the camera position, must also be changed. In close-up photography, camera shake is likely to occur during shooting due to the high shooting accuracy β, and it is also difficult to capture minute objects reliably within the shooting frame. It is common to shoot with the camera fixed. Therefore, the operation of moving the camera position and adjusting the focus in response to changes in the shooting distance 1IILL due to changes in shooting magnification means moving the position of the stabilizing device itself, such as a tripod; The total weight of the camera, photographic lens, and close-up intermediate device mounted on it must be moved, which is cumbersome, and as a result of this movement, the minute subject falls outside the photographic frame, making it necessary to recompose, focus, etc. This causes the inconvenience of having to redo the pre-shoot preparations.

Further, vibrations generated when a stabilizing device such as a tripod is moved may cause the minute object to move, which tends to cause problems that disturb the set state for photographing.

In other words, conventionally, when operating the intermediate device with a variable focal length photographing lens attached to the intermediate device for close-up photography, the amount of extension d was detected each time using a scale attached to the intermediate device. However, based on this, the variable focal length photographing lens must be operated to adjust its focal length to a predetermined position, which is a very inconvenient operation. Additionally, operational errors were likely to occur during this time.

An object of the present invention is to provide a close-up photographing device that solves the above-mentioned problems.

(Means for Solving the Problems) The present invention provides a camera, a photographing lens, and a camera, a photographic lens, and a camera, a photographing lens, and a camera, a camera, a photographic lens, and the like, in which both are held with their optical axes substantially coincident with each other, and the distance between the two in the optical axis direction is adjusted to a desired photographing distance. It has an intermediate device that changes the size depending on the magnification. The telescopic device has a telescopically configured dark housing that is in continuous communication, and the photographing lens is a variable focal length photographing lens, and the variable focal length photographing lens is mounted and held in the photographing lens mounting portion of the intermediate device. means for detecting the amount of expansion and contraction of the intermediate device as the amount of movement of the navigation photographing lens attachment portion from the position of the photography camera attachment portion when the intermediate device is operated to extend and retract in order to set a desired photographic magnification. A close-up photographing device is characterized in that it has a moving means for moving a lens related to changing the focal length of the photographic lens to an appropriate position in the optical axis direction based on the detected movement amount.

(Operation) FIG. 1 is a graph qualitatively explaining the principle and operation of the device of the present invention. The graph in Figure 1 is a result of solving the optical formula % with the photographing distance @It as a constant value, and the distance between the photographing lens and the film (focal plane) when the lens is extended Ld (photographing magnification 1/ω If the focal length f of the photographing lens is changed from increase to decrease in conjunction with the increase in (increase in), the photographing magnification β can be monotonically increased without changing the photographing distance 2.

Since the above optical system (2) is an image forming system, the feeding ff1d
Therefore, if f is changed in conjunction with the change in d along the graph in Figure 1, the photographic focus will not shift due to a change in . It is possible to eliminate all the disadvantages, that is, the various inconveniences associated with moving the tripod to change the photographing magnification.

Figure 2 shows variable focal length photographic lens A as a photographic lens.
It is an optical system model diagram of an example, and it is LIL2, L3, L4.
are lens groups each composed of one or more lenses, and D is an aperture. Luns group L1
- Second lens group L2 - Third lens group L3 - Fourth lens group L4 and diaphragm D are moved to change the focal length, that is, to change the magnification.

Each lens position state in (a), (b), and (C) in Figure 2 is the focal length IIIflf2 f on the graph in Figure 1, respectively.
This shows the position state when the position is l.

(a) and (c) have an optically conjugate arrangement, and f
,=f3. Due to the relationship t/β,=β3, β2=x1. In other words, the second lens group L2, the third lens group L3, and the diaphragm D move linearly together. The lens group and the fourth lens group L4 move completely symmetrically with respect to the second lens group L2, the third lens group L3, and the aperture D, so that the distance between the lenses is equal in the same magnification state (b). Become the closest. Furthermore, the second lens group L of the lens group and the fourth lens group
2 - The movement on the optical axis relative to the third lens group L3 and the aperture p is configured so that the movement from shooting magnification β1 to β2 (equal magnification) is equal to the movement from β3 to β2 (equal magnification). has been done. That is, the positions of the second lens group L2, the third lens group L3, and the aperture D with respect to each magnification of the second lens group L1 and the fourth lens group L4 are as shown in FIG. Furthermore, at each magnification and at any imaging magnification between them, the distance between the subject and the intended imaging plane is always constant, and once focused, there is no need to focus again even if the magnification is changed.

Thus, from the subject plane to the imaging plane (camera film plane)
By automatically changing the focal length of the photographing lens, that is, changing the photographing magnification, in conjunction with the expansion and contraction operations of the intermediate device, without changing the photographing distance, that is, while keeping the camera position constant. It is possible to improve the operability during photographing and when attaching and detaching the photographing lens, and the external shape is not damaged.

(Example) Fig. 5 is a longitudinal sectional side view of the device, and A is a variable focal length ff1) as a photographing lens. 2 lenses (hereinafter abbreviated as photographic lenses), B is the intermediate device (bellows)
The generic code C is a camera.

Regarding camera C, its outline is indicated by a two-dot chain line and the detailed structure is omitted.

1. Configuration of photographic lens A (Figs. 5-8) A vertical side view in Fig. 5, a developed plan view of the main parts in Fig. 6, a plan view in Fig. 7,
In the side view of Fig. 8, 1 is an exterior ring, 2 is a guide tube that is fitted concentrically into this exterior ring with an annular gap and is integrally screwed together with the exterior ring, and 3 is a guide tube that is screwed together with the exterior ring. The front group cam cylinder 64, which is fitted concentrically and is rotatable forward and backward around the optical axis inside the guide cylinder, is integrally screwed to the rear end of the guide cylinder 2 and concentrically with the guide cylinder. , exterior ring! A fixed lens barrel is provided to protrude rearward from the rear end, and reference numeral 5 is a rear group cam barrel that is fitted concentrically to the fixed lens barrel, and is rotatable forward and backward around the optical axis on the outside of the fixed lens barrel. . 6 is exterior ring 1
At the rear end position, it is an annular mount that is integrally fixed to the distal end flange portion of the fixed lens barrel 4 and is used for mounting an intermediate device B, which will be described later. Therefore, the four members, the outer ring 1, the guide tube 2, the fixed ia tube 4, and the mount 6, are integral with each other.

Reference numeral 7 denotes a lens barrel holding the lens group L1, which is fitted inside the front group cam barrel 3 at the tip end side thereof and concentrically with the cam barrel. Reference numeral 8 denotes a second lens group barrel holding the second lens group L2, which is integrally mounted and supported at the tip of the fixed lens barrel 4, and is mounted inside the cam barrel 3 on the rear end side of the front group cam barrel 3. It is located concentrically with the cam cylinder.

Reference numeral 9 denotes a third lens group barrel that is integrally molded within the fixed lens barrel on the distal end side of the fixed lens barrel 4, concentrically with the lens barrel, and holds the third lens group L3. ing. lO
A fourth lens group lens barrel is fitted inside the rear end side of the fixed lens barrel 4, and holds the fourth lens group L4. 11 is the second
and a diaphragm unit that is integrally mounted and supported on the fixed lens barrel 4 side in the open position with the third lens group barrels 8 and 9, and includes a Stellar Dong motor lla, and the motor I
The aperture D is driven by la.

Inside the guide tube 2, as shown in the developed plan view of the main part in Fig. 6, there are two stripes parallel to the optical axis (in the direction of the cylinder's generatrix) at two positions approximately 180" opposite to each other on the circumference of the cylinder. The guide tube 2 is provided with straight groove holes 12 and 12, and first and second two parallel circumferential groove holes 13 and 14 in the circumferential direction of the cylinder, which are perpendicular to the straight grooves. Inside the front group cam cylinder 3, there is approximately 180° of the cylinder circumference.
Edge calcam grooves 15 are provided at two opposing positions. The second lens group lens barrel 7 fitted inside the surface group cam barrel 3 is provided with pin shafts 16 at two positions approximately 180° opposed to each other around the barrel circumference.
16, and their pin shafts are connected to the front group cam cylinder 3, respectively.
The edge calcam slot 15 and the straight slot 12 of the guide tube 2
The intersecting portions of both are penetrated and engaged. Therefore, the lens group lens barrel 7, that is, the lens group L1 moves forward in the optical axis direction within the front group cam tube 3 by rotating the front group cam tube 3 forward and backward around the optical axis with respect to the guide tube 2. Move backwards. 1
Reference numeral 7 denotes a front group biasing spring that is stretched between the tip of the exterior ring l and the lens group m cylinder 7, and constantly pulls the lens group lens barrel 7 in the forward direction within the front group cam cylinder 3. It is energizing.

Reference numeral 18 denotes a protruding member integrally provided on the outer surface of the front group cam R3, the tip of which is connected to the first circumferential groove hole 13 of the guide tube 2.
is made to penetrate and protrude to the outer surface side of the guide tube 2. 19
is a bottle installed on the outer surface of the guide tube 2, and this bottle 19
A cam cylinder drive spring 20 is stretched between the cam cylinder and the direct projection member 18. This cam barrel drive spring 20 constantly rotates the front group cam barrel 3 clockwise (forward rotation direction) around the optical axis within the guide barrel 2 when viewing the photographic lens A from the front (first lens group, side). It is strong.

On the other hand, inside the fixed lens barrel 4, as shown in the developed plan view of the main part in FIG. 2 straight grooves 21.2
1. Further, the inside of the rear group cam cylinder 5 which is externally fitted onto the fixed lens barrel 4 is provided with edge cam slots 22 at two positions approximately 180° opposed to each other around the cylinder periphery. And fixed jJ! Pin shafts 23, 23 are implanted in the fourth lens group barrel 10 fitted inside the barrel 4 at two positions approximately 180 inches opposite to each other around the barrel circumference.
These pin shafts are respectively penetrated and engaged with the intersection portions of the linear groove 21 of the fixed lens barrel 4 and the edge cam groove 22 of the rear group cam barrel 5.

Therefore, the fourth lens group barrel 10, that is, the fourth lens group L4,
By rotating the rear group cam barrel 5 forward and backward around the optical axis with respect to the fixed lens barrel 4, it moves backward and forward in the optical axis direction within the fixed lens barrel 4. 24 is a rear group biasing spring stretched between the rear end of the fixed lens barrel 4 and the fourth lens group barrel 10; is constantly under tension.

A key member 25 has one end fixed to the outer surface of the front end side of the rear group cam cylinder 5 and the other end fitted into a notch groove 26 formed in the rear end flange of the front group cam cylinder 3. Therefore, rotational force is transmitted between the rear group cam cylinder 5 and the front group cam cylinder 3 through the key member 25, and when one rotates in the forward and reverse directions, the other also rotates in the forward and reverse directions.

Reference numeral 27 denotes an interlocking pawl that is integrally provided on the outer surface of the rear group cam cylinder 5 and is interlocked with an intermediate device B, which will be described later.

Reference numeral 28 denotes an electric signal bottle assembly provided on the head mounting mount 6.

Reference numeral 29 denotes a circuit unit fixed to the outer surface of the guide tube in the gap space between the outer ring 1 and the guide tube 2, and is connected to the aperture unit 11 and the electric signal pin assembly 28 via lead wires (not shown). are connected to each other.

30 is housed in the gap space between the outer ring 1 and the guide tube 2,
It is a magnification display plate in the shape of an arc plate concentric with the optical axis, and an F-direction bent leg portion 30a integrated with the display plate is passed through the second circumferential groove hole 14 of the guide tube 2 and fitted into the guide tube 2. It is supported by the front group cam cylinder 3 by fixing it to the outer surface of the n1 group cam cylinder 3. Therefore, when the front group cam barrel 3 is rotated in the forward and reverse directions, the magnification display plate 30 rotates in the forward and reverse directions around the optical axis together with the cam barrel.

31 is a window hole provided on the outer surface of the exterior ring l; 31a is a transparent cover member for dustproofing that covers this window hole; is visible.

32 (FIGS. 7 and 8) is a fixed index attached to the outer surface of the rear end side of the exterior ring l, and is an alignment mark when attaching the photographing lens A to an intermediate device B, which will be described later.

The first to fourth lens groups, ~L4, and the aperture D are the second lens groups mentioned above.
It corresponds to the first to fourth lens groups L1 to L4 and diaphragm D in Fig. and the second lens group L2 and the third lens group L3, in which the lens group barrel 7, that is, the lens group 3, and the fourth lens group lens barrel 1o, that is, the fourth lens group L4 are fixed along the optical axis. move away from (the 4th lun group moves forward along the optical axis,
On the contrary, the lens group L4 moves backward), or the second lens group L2.
The lens group moves in the direction approaching the third lens group L3 (the third lens group moves backward along the optical axis, and the fourth lens group L4 moves forward), and the lens group arrangement is as shown in Figure 2 (a). (C),
Arrangement in the short focus state of Fig. 3 (a) and (C) (arrangement state with magnification β1 or β3), or Fig. 2 (b) and Fig. 3 (b)
array in long focus state (array state with magnification β2 (same magnification))
It changes steplessly.

In the longitudinal sectional side view of the device in FIG.
The upper half from the optical axis with -0 as the border shows the mutual arrangement in the short focus state with magnification β1 or β3, and the lower half shows the magnification β2 (equal magnification)
The mutual arrangement of the two images in the long focus state is shown.

■, Configuration of intermediate device B (Figs. 5, 9 to 13) In the vertical sectional side view in Fig. 5, the side view in Fig. 9, and the partially cutaway front view in Fig. 10, 50 is a long guide in the front and rear direction. Rail member, 5
0a is a rack fixedly provided along the length of the upper surface; 5
Reference numeral 1 denotes a support member (hereinafter referred to as the first support member) on which the photographing lens is attached, and is mounted on the guide rail member 50 so that the base side engages with the rail member in a dovetail groove and smoothly moves along the length of the rail member. It can be mounted freely and stably in forward and backward sliding movement. Reference numeral 52 denotes a support member (hereinafter referred to as a second support member) for mounting the camera, and on the rear side of the first support member 51, a dovetail groove is provided on the guide rail member 50 with the base side facing the rail member. In addition, the rail member can be smoothly and stably moved forward and backward along the length of the rail member.

Reference numeral 53 denotes a drive knob shaft disposed on the base side of the first support member 51 so as to pass through the member in the left direction and be freely rotatably supported;
54, 54 are knobs fixed to both left and right ends of the knob shaft;
Reference numerals 5 and 56 denote a pinion gear and a drive gear respectively fixed to the middle of the knob shaft. Therefore, when the knob 54 is rotated in the forward and reverse directions, the second gear 55 and the rack 50a on the guide rail member 50 side are engaged with each other, so that the first member 51
moves forward and backward along the rail member 50.

Similarly, for the second support member 52, a drive knob shaft 57 is disposed by penetrating the base side of the second support member 52 so as to freely rotate the shaft, and a drive knob shaft 57 is disposed in the middle thereof to be engaged with the rack 50a on the guide rail member 50 side. A matching pinion gear 59 is provided, and by rotating knobs 58 fixed to both left and right ends of a knob shaft 57 in forward and reverse directions, the second member 52 is slidably moved forward and backward along the rail member 50.

On the right side of the first member 51, 60 (Fig. 10) is an opening for inserting a photographic lens, 61 is an annular mount fixed concentrically with the opening 60 on the front side of the member 51, and 62 and 63 (Fig. 5) are A pair of front and rear interlocking rings 64 are rotatably assembled concentrically with the opening 60 on the back side of the member 51, and 64 are the first and second interlocking ring receivers, which are fixed to the member 51. and the first and second interlocking rings 62 and 6
3 is rotatably held. 62a and 63a are first and second interlocking claws provided inwardly on a part of the inner periphery of the first and second interlocking rings 62 and 63, and 62b and 63b are the first and second interlocking claws, respectively. These are first and second annular interlocking gears that are integrally provided on each side of the interlocking rings 62 and 63 so as to be concentric with the rings. A drive gear 5 integrated with the drive knob shaft 53
6 and the second interlocking gear 63b are connected to the interlocking gear train 6.
We will contact you via 1-G7. Gears G1 and G2, G3 and G4, and G5 and G6 are coaxial, integrally rotating two-stage gears. Also, the final gear G7 of the above gear train (
The second interlocking gear 63b and the first interlocking gear 62b are engaged with each other via a differential gear G8 (FIG. 10).

Therefore, as described above, when the first support member 51, which is a support member, is moved along the guide rail member 50 by forward and reverse rotation of the knob 54, the photographing lens is attached in conjunction with the movement. The forward or reverse rotational force of the drive gear 56 is transmitted to the second interlocking gear 63b via the gear trains 01 to G7, and further transmitted to the first interlocking gear 62b via the differential gear G8. As a result, the first and second interlocking rings 62 and 63 are driven in forward and reverse directions with the same rotation angle but opposite rotation directions.

Reference numeral 65 (FIG. 5) is an electric signal bin assembly in which a pin tip is always urged to protrude by an elastic spring plate member 65a on a part of the outer surface of the annular mount 61, and the first member 5
When the photographing lens A is properly attached to the photographing lens mounting opening 60 of No. 1, the electric signal assembly 28 on the photographing lens A side faces the electric signal assembly 65, and both assemblies 65 and 28 The corresponding bottles are pressed into contact with each other, and both assemblies 65 and 28 are in electrical communication with each other.

Reference numeral 66 (FIG. 10) is a fixed index attached to the outer surface of the uppermost part of the annular mount 61, and the alignment with the fixed index 32 (FIGS. 7 and 8) attached to the photographing lens A side is the mark [1].

The camera is mounted on the second support member 52 as a support member, 67 is a camera mounting capacity [1], and 68 is an annular mount for mounting a camera fixed concentrically with the opening 67 on the back side of the member '52.

69 is interposed between the first support member 51 and the second member 52, with the front end fixed to the first support member 51 and the rear end fixed to the second support member 52. It is a bellows serving as a dark casing with a freely expandable structure in which the opening 60 for fitting a photographing lens on the side and the opening 67 for attaching a camera on the side of the second support member 52 are communicated in the optical axis direction.

Reference numeral 70 denotes an electrical signal bin assembly mounted on the annular mount 68 for mounting the camera.

By engaging a facing mount (not shown) on the camera C side with the mount 68, the camera C is firmly mounted and supported on the second support member 52.

When the camera C is properly mounted and supported on the second support member 52 via the mount 68, the mount 68
An electrical signal bin assembly (not shown) on the camera C side comes into corresponding contact with the electrical signal bin assembly 70 on the side, and the two assemblies are in electrical communication with each other.

Electrical signal bin assembly 70 on the second support member 52 side
The assembly 65 on the first support member 51 side is electrically connected to each other by a lead wire (not shown). Therefore, when the photographic lens A is properly mounted and supported on the first support member 51 of the intermediate device B, and the camera C is properly mounted and supported on the second support member 52, the electric circuit on the camera C side and the electric circuit on the photographic lens A side are connected. They are in contact with each other.

The bellows 69 moves the first support member 51 and/or the second support member 52 forward and backward along the guide rail member 50 by forward and reverse rotation operations of the knobs 54 and 58, thereby increasing and decreasing the mutual spacing between the members 51 and 52. When changed, the aperture 60 for fitting the photographing lens on the first support member 51 side and the aperture 67 for attaching the camera on the second support member 52 side expand and contract depending on the size of the mutual spacing, and the aperture 67 for attaching the camera on the second support member 52 side extends and contracts in accordance with the size of the mutual interval. We are always in contact with each other on the road.

(2) Interlocking of intermediate device B and photographic lens A The photographing lens of intermediate device B (hereinafter referred to as bellows) is attached to the first support member 51 which is a support member. Insert the rear group cam barrel 5 portion of the photographic lens A into the mounting opening 60, and align the photographic lens A so that the fixed index 32 on the photographing lens A side corresponds to the fixed index 66 on the first support member 51 side. Adjust the rotation angle posture to bring the mount 6 on the photographing lens A side into contact with the mount 61 on the first support member 51 side, and then
is sufficiently rotated clockwise until a stopper (not shown) prevents further rotation of -F (approximately 6
0° rotation operation). As a result, the photographing lens A is stably mounted and supported on the first support member 51 by the mutual engagement of the mounts 6 and 61. In the normal mounting state, the photographing lens A is in a rotating angle position in which the magnification display window 31 portion of the outer ring l faces upward, and the electric signal bin assembly 28 is normally attached to the same assembly 65 on the first support member 51 side. They face each other face-to-face and are electrically connected to each other.

When the photographing lens A is inserted into the opening 60 of the first support member 51 and rotated in the manner described above in order to attach the photographing lens to the first support member 51, the rear group cam barrel 5 of the photographic lens A is rotated. An interlocking pawl 27 protruding from the outer surface of the support member 51 contacts and is locked with the second interlocking pawl 63a on the first support member 51 side. For this purpose, the rear group cam cylinder 5, this cam cylinder and the key member 2
At that point, the rotation of the integral moe group cam cylinder 3 is stopped via the outer ring 1, the guide cylinder 2 which is integrally screwed to the outer ring 1, and the guide cylinder 2 which is integrally screwed to this guide cylinder. The fixed lens barrel 4, which is attached to the tip flange of the fixed lens barrel -
The mount 6, which is fixedly attached to the body, rotates further until further rotation is prevented by a stopper portion (not shown). As a result, the cam cylinder drive spring 20 stretched between the protruding member 18 of the front group cam cylinder 3 and the implanted dowel 19 of the guide cylinder 2 is in a stretched state. The developed plan view of the main part of FIG. 6 shows the spring 20 in a stretched state.

In other words, the photographing lens A is connected to the bellows B (7) and the first support member 5.
After attaching it to 1, the spring 20 is stretched as shown above.
Due to the reaction force, the interlocking claw 27 of the rear group cam barrel 5 of the photographing lens A
is always pressed and kept in contact with the second interlocking pawl 63a on the first support member 51 side without play.

With the photographic lens A attached to the first support member 51 of the bellows B as described above, and the camera C attached to the second support member 52, the first support member 51 and the knob 54 are rotated in the forward and reverse directions. When the guide rail member 50 is moved forward and backward, the forward and reverse rotation forces of the drive gear 56 are transmitted to the second interlocking gear 6 via gear trains 01 to G7.
3b and has a second interlocking pawl 63a.
The interlocking ring 63 is rotated forward and backward. The interlocking gear 62b of the writer 1 rotates in the normal direction via the gear G7 and the differential gear G8.
The first interlocking ring 62 receives a reversing force and is rotated forward and reverse in a relationship such that the rotation angle is equal to that of the second interlocking gear 63b but the rotation direction is opposite, and the first interlocking ring 62 has a first interlocking pawl 62a.
is rotated forward and reverse. That is, a second interlocking ring 63 having a second interlocking pawl 63a, and a first interlocking pawl 62a.
The first interlocking ring 62 having a
In conjunction with the forward and backward movement operations along the guide rail member 50, the motor rotates forward and backward in the above relationship.

And the second interlocking claw 63a of the second interlocking ring 63
, or the first interlocking pawl 62a of the first interlocking ring 62, the interlocking pawl 27 on the photographing lens section is always in engagement contact with the reaction force of the spring 20 in the above-mentioned stretched state,
Therefore, the second or first interlocking ring 6 is interlocked with the forward/backward movement operation of the first support member 51 along the guide rail member 50.
In conjunction with the forward and reverse rotations of lenses 3 and 62, the rear group cam barrel 5 of the photographing lens A is rotated in the forward and reverse directions around the outside of the fixed lens barrel 4. Also, the front group cam cylinder 3, which is integrated with the rear group cam cylinder 5 via the key member 25, is connected to the guide cylinder 2 together with the rear group cam cylinder 5.
Rotates forward and reverse inwardly. In conjunction with the forward and reverse rotation of the front group and rear group cam barrels 3 and 5, as described above, the lens group barrel 7, that is, the lens group LL, and the fourth lens group barrel 10, that is, the fourth lens. The lens group L4 is driven to move away from or toward the second lens group L2, diaphragm D, and third lens group L3, which are stationary, respectively, along the optical axis;
The lens arrangement in the short focus state (magnification β or β3) in Fig. 2 (a) and (C), Fig. 3 (a) and (e), or the lens arrangement in Fig. 2 (b) and Fig. 3 ( b) The lens arrangement changes steplessly to the long focus state (magnification β2 (same magnification)).

■Specifically, when changing the magnification from the low magnification side (photographing magnification β) to the high magnification side β1 → β2 → β3 in FIG. It is rotated in the normal direction to move forward along the guide rail member 50.

In the low magnification state where the first support member 51 is closest to the second support member 52 located on the rear end side of the guide rail member 50 as shown in FIG.
The interlocking mechanism is the interlocking claw 2 on the lens side as shown in Fig. 11.
7 and the second interlocking pawl 63a on the bellows portion side are in contact with each other.

■ From this state, if you rotate the knob 54 in the normal direction and move the first support member 51 of the bellows B to the approximately midpoint position of the rail member 50 as shown by the line 2 points 31 in FIG. 5, the photographing magnification will be It is designed to be the same size β2. At this time, lens A
The interlocking mechanism of the bellows B and the bellows B is as shown in FIG. ) are in contact with each other.

■Furthermore, rotate the knob 54 in the normal direction to move the first support member 51 of the bellows B to the rail member 5 as shown by the three-dot chain line in FIG.
If you move it forward to a position closer to the tip of 0, the imaging magnification will be
From the same magnification β2 to the higher magnification β3, at this time the interlocking mechanism between lens A and bellows B becomes as shown in Fig. 13.
The interlocking claw 27 on the lens section side is in contact with the first interlocking claw 62a on the bellows section side.

By the above operation ■→■→■, the rear group cam 'r of photographic lens A is
:115 and front group cam cylinder 3 are interlocking ring 6 of bellows B
With the movement of 3.62, the rotation direction is reversed from low magnification β1 to equal magnification β2 and from equal magnification β2 to high magnification β3. The movements of each lens group ~L4 and diaphragm D are shown in FIG. Further, the movements of each lens group 1 to L4 and the aperture D with respect to the planned image forming plane F (the film plane in the camera C) are as shown in FIG.

Furthermore, a front group biasing spring 17 is installed between the first lens group lens barrel 7 and the tip of the exterior ring 1, and a front group biasing spring 17 is installed between the first lens group lens barrel 7 and the tip of the outer ring 1.
The urging force assists the movement of the pin shaft 16 passing through the edge cam slot 15 of the front group cam cylinder 3 in the direction of extension of the spring 17. At the same time, since the position of the bottle shaft 16 relative to the hemlock cam slot 15 is pressed in one direction by the urging force, the positional accuracy of the bottle shaft 16 can be determined with high precision.

Further, a rear group biasing spring 24 is installed between the end of the fourth lens group vA barrel 10 and the fixed m barrel 4, and biases the fourth lens group barrel 10 in the extension direction. The spring 2 of the pin shaft 23 fitted into the edge cam slot 22 of the rear group cam cylinder 5
It helps the movement of 4 in the direction of extension. At the same time, since the position of the pin shaft 23 relative to the hemline cam slot 22 is pressed in the direction by the biasing force, the positional degree of the pin shaft 23 can be determined with high accuracy.

The magnification display plate 30 rotates together with the cam 7i43 as the front group cam cylinder 3 rotates in the forward and reverse directions as the magnification is changed by forward and reverse rotation of the knob 54, and is moved by the rotation of the knob 54. The magnification value display portion corresponding to the current position on the guide rail member 50 of the first support member 51 on the bellows 8 side is located in the upward window hole 31 provided on the outer surface of the exterior ring 1, The magnification value is displayed accurately in correspondence with the indicator 31b (FIG. 7).

That is, the photographing lens A itself is provided with means for displaying the photographing magnification in conjunction with the interlocking mechanism between the bellows B and the photographing lens A. This makes the magnification display very easy to see, and a new mechanism for displaying the magnification is also provided. It is not necessary to provide a magnification, and inexpensive magnification display is possible.

(Effects of the Invention) As described above, the device of the present invention can take pictures in conjunction with the telescoping operation of the intermediate device without changing the photographing distance from the subject plane to the imaging plane, that is, without changing the position of the camera. Since the focal length of the lens (variable focal length photographic lens) is automatically changed, that is, the photographic magnification is changed, the above-mentioned conventional problems are resolved and operability during photographing and when attaching and detaching the photographic lens is improved. It is possible to do this without damaging the external shape.

[Brief explanation of the drawing]

Figure 1 is a principle mode graph for close-up photography, Figures 2 and 3 are focal length ll! Optical system model diagrams of the I-variable photographic lens, Figures 4 (a), (b) and (C) are correlation model diagrams between the lens extension amount and photographic magnification, and Figures 5 to 13 show the example device. , FIG. 5 is a vertical side view of the device, FIG. 6 is a developed plan view of the main part of the photographic lens (cam mechanism), FIGS. 7 and 8 are a plan view and side view of the photographic lens, and FIG.
The figure is a side view of the intermediate device (bellows), Figure 10 is a partially cutaway front view, and Figures 11, 12, and 13 are the interlocking claws on the photographing lens side and the interlocking claw on the intermediate device side, respectively. FIG. A is the photographic lens (focal length variable photographic lens), B is the intermediate device (bellows), C is the camera, ~L4 is the first to fourth lens group, D is the diaphragm, and 51 and 52 are the intermediate devices for photographing, respectively. A supporting member (first supporting member) is used for lens mounting, a supporting member (second supporting member) is used for camera mounting, 50 is a guide rail member,
54 and 58 are support member movement operation knobs.

Claims (1)

[Claims] (1) It has a camera, a photographing lens, and an intermediate device that holds the two front and back with their optical axes substantially aligned, and that changes the distance between them in the optical axis direction depending on the desired photographic magnification. The intermediate device includes a camera mounting section and a photographic lens mounting section that can be moved relatively apart and toward each other in the optical axis direction, and a dark housing section that is freely extendable and retractable and that communicates between the two mounting sections. The intermediate device is a telescoping device having a telescopic device, wherein the photographing lens is a variable focal length photographing lens, and the variable focal length photographing lens is attached and held to the photographing lens mounting portion of the intermediate device, and the intermediate device is configured to set a desired photographing magnification. means for detecting the amount of expansion/contraction of the intermediate device as the amount of movement of the photographic lens attachment section starting from the position of the photographic camera attachment section when the intermediate device is operated to extend or contract; 1. A close-up photographing device, comprising a moving means for moving a lens involved in changing the focal length of the lens to an appropriate position in the optical axis direction.