JPH0836128A - Multifocus camera - Google Patents

Abstract

PURPOSE:To control a diaphragm by utilizing detected information by driving a photographing optical system according to a distance to an object and detecting a distance signal showing a photographing distance based on the position of the photographing optical system by using a detection device. CONSTITUTION:The angle measurement system distance detection device is constituted of a cam lever 45, a photodetector 48, a light projection lens L1, a light receiving lens L2 and a photodetector 49. An arm 50 is fixed to one end of a rotary shaft 42 having the other end to which a turning lever 41 is fixed and slid on a code pattern 51 formed on a substrate 53 provided at the fixed part of a camera main body 1. Besides, a sliding brush 52 is fixed to one end of the arm 50. Therefore, the brush 52 is turned and displaced integrally with the lever 41 by a linking lever for a wide angle 31 and a linking lever for a telephotograph 32. Then, the photographing optical system is driven according to the distance to the object and the distance signal showing the photographing distance is detected by the detection device based on the position of the photographing optical system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting lens position information of a camera, and more particularly, to moving a main optical system capable of taking an image independently on the optical axis of the image taking, and in accordance with the movement of the main optical system. The present invention relates to a lens position information detecting device in a multifocal camera configured so that a projection lens can be switched to at least two different focal lengths by inserting a sub optical system on the photographing optical axis.

[0002]

2. Description of the Related Art In order to switch the focal length of a photographing lens into at least two types, a main optical system capable of independently photographing is moved along a photographing optical axis, and a sub optical system is photographed in conjunction with the movement. A so-called bifocal camera configured to be inserted on the optical axis is disclosed in, for example, Japanese Patent Laid-Open No. 52-76919.
And Japanese Patent Laid-Open No. 54-33027.

Further, a bifocal camera equipped with an automatic focusing device linked to a main optical system is also disclosed in, for example, Japanese Patent Laid-Open No. 58-202.
It is disclosed by Japanese Patent Laid-Open No. 431 or the like and is already known. A device for detecting the position of the taking lens in the lens barrel by pulse counting is also disclosed in JP-A-59-59.
It is known from Japanese Patent No. 64816.

[0004]

However, in the bifocal camera equipped with the above-mentioned known automatic focus adjusting device, the lens position information transmitted from the main optical system side includes the focal length change information. Absent. Therefore, in order to correct the change in the aperture value (lower value) caused by switching the focal length, an interlocking mechanism that changes the aperture diameter in conjunction with the movement of the main optical system or the sub optical system for focal length conversion is used. More must be added. Furthermore, even when the flashmatic device is added to the above-mentioned known bifocal camera, it is necessary to additionally add a device for transmitting focal length information, which is a drawback that the structure of the lens moving device becomes complicated.

The present invention solves the above-mentioned drawbacks of the conventional camera and detects the distance to the object and the focal length information of the photographing lens by detecting the position of the photographing lens on the optical axis. An object of the present invention is to provide a camera capable of performing aperture control and the like by utilizing the detected information. Another object of the present invention is to obtain focal length information of a taking lens without increasing the number of parts and increasing the size of the camera.

[0006]

In order to achieve the above object, the present invention provides a multifocal camera which is movable to at least two focal lengths in the optical axis direction of a taking lens, and has a first focal point. A lens barrel capable of moving a first focus adjustment region in which a focus adjustment is performed at a distance and a second focus adjustment region in which a focus adjustment at a second focal length different from the first focus distance is performed. Detecting the position of the lens barrel with respect to a predetermined position in the camera, and detecting the focal length at which the lens barrel is located, and the amount of extension of the lens barrel at each of the focal lengths. And a lens barrel position detecting means for detecting automatically.

[0007]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view of an embodiment of the present invention, and FIGS. 2 and 3 are longitudinal sectional views of a variable focus camera incorporating the embodiment of FIG. 1. In FIG. 2, a sub optical system is out of the photographing optical path. A state, FIG. 3 shows a state in which the sub optical system is inserted in the photographing optical path.

In FIGS. 1 and 2, a base plate 10, which will be described in detail later, is movably provided on the front surface of the film opening 2 in the camera body 1. The base plate 10 is
A main optical system 4 having an opening 10a at substantially the center thereof and a main lens frame 3 fixed to the front surface of the opening 10a and constituting a taking lens.
Is held. The sub optical system 5 is held in the movable lens frame 6 and is placed in the retracted position outside the photographing optical path in the wide-angle state of FIG. 2 and is inserted on the photographing optical axis in the telephoto state as shown in FIG. Is configured. Further, a diaphragm / shutter 7 is provided between the main optical system 4 and the base plate 10 and moves on the optical axis integrally with the main optical system 4.

The front projection 1A of the camera body 1 is provided with an opening 1a through which the front end of the main lens frame 3 can pass, and the inside of the front projection 1A is for blocking the opening 1a. The dustproof cover 8 is provided to be openable and closable.
The dust cover 8 is opened and closed by a focal length selection lever 9 provided on the upper part of the camera body 1. As shown in FIG. 2, when the main lens frame 3 holding the main optical system 4 is in the wide-angle shooting range, the focal length selection lever 9 is an index as shown in the top view of the camera of FIG. When 9A is opposed to the wide-angle symbol “W” provided on the upper surface of the camera body 1 and the main lens frame 3 is in the extended telephoto range as shown in FIG. 3, the index 9A is changed to the telescopic symbol “T”. It is configured so that they can face each other and can be arbitrarily set. Further, when the index 9A of the focal length selection lever 9 rotates so as to indicate the symbol “OFF”, the front surface of the main optical system 4 is covered with the dust cover 8
Are configured to cover.

On the other hand, on the focal length selection lever 9, conductor lands Cd ₁ and Cd provided on the fixed portion of the camera body 1 are provided.
Sliding contact pieces Br ₁ and Br ₂ respectively contacting d ₂ are provided so as to be displaced in conjunction with each other, and a long strip-shaped conductor land Cd is provided.
_The switch Sw ₁ is composed of ₁ and the sliding contact Br ₁ , and the switch Sw is composed of the short conductor land Cd ₂ and the sliding contact Br _2.
2 are configured. The switch Sw ₁ is turned on when the focal length selection lever 9 is at the wide-angle symbol W and the telephoto symbol T.
It becomes N, and it becomes OFF when it is displaced to the symbol "OFF" position. Further, the switch Sw ₂ is turned on only when the focal length selection lever 9 is at the position of the telephoto symbol T, and is turned off at the positions of other W symbols and OFF symbols. The two switches Sw ₁ and Sw ₂ are configured to control the rotation of a motor H (see FIGS. 1 and 2) for displacing the main optical system 4 and the sub optical system 5.

FIG. 5 is a perspective view of the base plate 10 as viewed from the back side in order to show a drive mechanism for driving the base plate 10 and the movable lens frame 6. The motor 11 is fixed to the upper back surface of the base plate 10, and bevel gears 12a and 12b are fixed to both ends of the rotation shaft of the motor 11 as shown in FIG. A bevel gear 13a meshes with one bevel gear 12a, and the bevel gear 13a is rotatably supported on the base plate 10 together with a spur gear 14 formed integrally. The first drive gear 15, which meshes with the spur gear 14, is rotatably supported by the base plate 10, and has a female lead screw provided at the center thereof,
A first feed screw 16 fixed to the fixed portion of the camera body 1 and extending in the optical axis direction is screwed.

The spur gear 1 integrated with the bevel gear 13a
4 is in mesh with the second drive gear 18 via the gear train 17. Like the first drive gear 15, the second drive gear 18 is also rotatably supported on the base plate 10, and is fixed to a female lead screw provided at the center of the second drive gear 18 at a fixed portion of the camera body.
Further, the second feed screw 19 extending in the optical axis direction is screwed. The first drive gear 15 and the second drive gear 18 are configured so that their rotational speeds are equal to each other, and the leads of the first feed screw 16 and the second feed screw 19 are also equal. . Therefore, when the motor 11 rotates and the first drive gear 15 and the second drive gear 16 rotate, the base plate 10 moves back and forth on the photographing optical axis along the first feed screw 16 and the second feed screw 19. It is possible.

Further, as shown in FIG. 5, an interlocking strut 20 extending in the optical axis direction is provided on the back surface of the base plate 10 so as to project therefrom, and a through hole 2 provided at the tip of this interlocking strut 20.
1 and a through hole 22 (see FIG. 1) provided in the base plate 10 are penetrated by a guide shaft 23 fixed to the fixed portion of the camera body 1 and extending in the optical axis direction. The base plate 10 is configured to be held perpendicularly to the optical axis by the interlocking support column 20 and the guide shaft 23, and to be translated back and forth along the optical axis in response to the rotation of the motor 11.

A bevel gear 13b meshes with the other bevel gear 12b provided on the rotating shaft of the motor 11, and a spur gear 24 integrally formed with the bevel gear 13b meshes with a cam gear 26 via a reduction gear train 25. A front cam 27 is formed on the surface of the cam gear 26. On the other hand, the movable lens frame 6 for holding the sub optical system 5 has a handle 6A, and one end of the handle 6A is rotatably supported together with the cam gear 26 on a fixed shaft 28 provided on the base plate 10 and compressed. The coil spring 29 urges the cam surface of the front cam 27 so as to come into pressure contact therewith.

On the base plate 10, the protruding portion 6 of the movable lens frame 6 is provided.
Locking members 30a and 30b that lock the movement of the movable lens frame 6 by engaging with B are fixed. When the projecting portion 6B comes into contact with the locking member 30a, the sub optical system 5 is placed in the retracted position as shown by the solid line in FIGS. 2 and 5, and when the projecting portion 6B comes into contact with the locking member 30b, FIG. Further, as shown by the chain line in FIG. 5, the sub optical system 5 is placed on the optical axis of the photographing.

The front cam 27 of the cam gear 26 is the cover of FIG.
The rotation angle is 0 to θ₁Head
The first flat section A where 0 does not change₁And θ₁To θ₂To
Lifting height is 0 to h₁Slope increasing linearly up to
Section B and θ₂To θ₃The lift is over h₁Do not change
2nd flat section C and θ₃To θ_FourThe lift is over h ₁
The second slope section D, which decreases linearly from 0 to 0, and θ_FourOr
The third flat section A where the head does not change from 0 to 360 °₂
Consisting of

When the handle 6A of the movable lens frame 6 is engaged with the first flat section A ₁ or the third flat section A ₂ , the sub optical system 5 is at the retracted position (FIG. 2) or on the photographing optical axis. At the position (FIG. 3), the protruding small cylinder 6C of the movable lens frame 6 is inserted and placed in the circular hole 10b or the opening 10a provided in the base plate 10. Therefore, while the handle portion 6A of the movable lens frame 6 is engaged in the flat sections A ₁ and A ₂ , even if the front cam 27 rotates, it is still placed at each position. The front cam 27 rotates normally or reversely to move the handle 6C to the first position.
When the movable lens frame 6 contacts the cam surface of the slope section B or the second slope section D and rises, the movable lens frame 6 moves in the optical axis direction, the protruding small cylinder 6C escapes from the circular hole 10b or the opening 10a, and the base plate 1
It rotates with the front cam 27 by the angle α along the back surface of 0. Further, when the handle portion 6A descends by the urging force of the spring 29 along the cam surface of the second slope section D or the first slope section B after surpassing the second flat section C, the handle member 30b or 30a 5, the movable lens frame 6 moves to the left and is stopped at the telephoto position in FIG. 3 or the wide-angle position in FIG.

The bevel gear 13a and the spur gear 14
The second feed screw 19 constitutes a main optical system displacement mechanism. Further, the bevel gear 13b and the spur gear 24 to the compression coil spring 29 constitute a sub optical system displacement mechanism. Since the optical system displacement mechanism for displacing the main optical system 4 and the sub optical system 5 is configured as described above, when the focal length selection lever 9 placed in the OFF position is rotated to the position of the wide angle symbol W, it is not shown. The dust cover 8 is opened via the interlocking mechanism, and the switch Sw ₁ is turned on as shown in FIG.
It becomes a state. At this position, only the main optical system 4 is placed on the photographing optical axis as shown in FIG. 2, and the base plate 10 is placed at the infinity position in the wide-angle photographing range which is extended rightmost. When the release button B _t (see FIG. 4) is pressed, the motor 11 rotates, the base plate 10 is extended to the left in FIG. 2, and the distance is adjusted in the wide-angle shooting range. At that time, the distance to the subject is
The motor 12 is controlled by being detected by a distance detecting device described later. Further, in this case, the cam gear 26 rotates in accordance with the rotation of the motor 11, and the front cam 27 moves the first flat section A ₁
Although it rotates within the distance adjustment range W (see FIG. 6), the movable lens frame 6 does not move relative to the base plate 10 in the optical axis direction nor in the direction perpendicular thereto.

Next, the focal length selection lever 9 is moved to the wide-angle position W.
Switch to telephoto position T, switch Sw ₂ turns on
Therefore, the motor 12 rotates, the base plate 10 is extended to the left in FIG. 2 beyond the close-up position in the wide-angle shooting range, and stops at the infinity position in the telephoto shooting range. Meanwhile, the front cam 27 rotates counterclockwise in FIG. 5 together with the cam gear 26, and the handle portion 6A of the movable lens frame 6 exceeds the first flat section A ₁ and the cam in the first slope section B in FIG. When the movable lens frame 6 is engaged with the surface, the movable lens frame 6 is displaced rightward in FIG. 5 along the fixed shaft 28 against the biasing force of the compression coil spring 29, and the movable lens frame 6 moves slightly before the lift h ₁ . The protruding small cylinder 6C escapes from the circular hole 10b. Then, the cam gear 26
The counterclockwise rotation causes the movable lens frame 6 to rotate together with the front cam 27 in the counterclockwise direction by an angle α, and the protruding locking portion 6
B comes into contact with the locking member 30b, and enters the state shown by the chain line in FIG.

When the protruding locking portion 6B comes into contact with the locking portion 30b, the movable lens frame 6 is prevented from rotating, so that the handle portion 6A is formed.
Moves over the first slope section B, slides down the second slope section D via the second flat section, and moves to the left in FIG. 5 by the biasing force of the compression coil spring 29. At this time, as shown in FIG. 3, the projecting small cylinder 6C of the moving lens frame 6 is inserted into the opening 10a, the moving lens frame 6 ends the relative displacement with respect to the base plate 10, and the sub optical system 5 and the main optical system 4 are connected. The combined focal length of is a predetermined long focal length. Further, the sub optical system 5 and the main optical system 4 move leftward together with the base plate 10, and when the base plate 10 reaches the infinity position in the telephoto shooting range, the movement is stopped.

In the above telephoto state, the release button B _t
When is pressed, the motor 11 is rotated again, the base plate 10 is extended to the left in FIG. 3, and the distance is adjusted in the telephoto shooting range. Next, the configuration of the interlocking mechanism of the distance detecting device and the distance signal generating device that interlock with the base plate 10 will be described. In FIG. 1, at one end of an interlocking support column 20 provided so as to project from the back surface of the base plate 10 in the optical axis direction, a first engaging protrusion 20A and a second engaging protrusion 20 are provided on the side surface and the upper surface, respectively.
B is projected, and one arm 31A of the wide-angle interlocking lever 31 is engaged with the first engagement protrusion 20A. The second engagement protrusion 20B is configured to engage with one arm 32A of the telescopic interlocking lever 32 while the base plate 10 is moving to the telescopic shooting area. The wide-angle interlocking lever 31 is pivotally supported by a pin shaft 33, is biased to rotate counterclockwise by a torsion coil spring 34, and its rotation is blocked by a limiting pin 35. The telescopic interlocking lever 32 is pivotally supported by a pin shaft 36 and is rotatably biased clockwise by a torsion coil spring 37, and its rotation is restricted by a restriction pin 38. Furthermore, a wide-angle interlocking lever 31 and a telephoto interlocking lever 32
A first interlocking pin 39 and a second interlocking pin 40 are implanted at the free ends of the other arms 31B and 32B.
The rotation lever 41 engaging with the interlocking pins 39 and 40 is
It is fixed to one end of the rotary shaft 42 and is biased by a torsion coil spring 43 so as to be rotatable clockwise in FIG.

As shown in FIG. 7, the first interlocking pin 39 engages with the first joint portion 41a of the pivot lever 41, and the counterclockwise pivotal movement of the wide-angle interlocking lever 31 causes the first engaging portion. 41
By pressing a, the rotating lever 41 is rotated counterclockwise against the biasing force of the torsion coil spring 43. Further, the second engaging portion 41 of the rotating lever 41 that can be engaged with the second interlocking pin 40.
b, when the other arm 31B of the wide-angle interlocking lever 31 rotates counterclockwise and contacts the limiting pin 38 in FIG.
The interlocking pin 40, which pivots around the pin shaft 36, is located on the orbit of the pivot. The interlocking column 20, the first engaging projection 20A, and the second engaging projection 20B constitute a cooperating means, and the wide-angle interlocking lever 31 and the first interlocking pin 39 form the first lever means, and The telescopic interlocking lever 32 and the second interlocking pin 40 form a second lever means.

At the free end of the rotary lever 41, a sliding pin 44 that engages with the cam lever 45 is planted. The cam lever 45 has one end supported by a pin shaft 46, and is constantly urged clockwise by a torsion coil spring 47. Further, the cam lever 45 has a bent portion 45 on the free end side.
A light emitting element 48 such as an infrared light emitting diode (IRED) is provided at the tip of the bent portion 45a. Further, in the cam lever 45, a wide-angle cam 45A, a light-emitting element returning cam 45B, and a telephoto cam 45C are continuously formed on the contact surface with the sliding pin 44 as shown in FIG.

The infrared spot light from the light emitting element 48 is
On the axis of the pin shaft 46 that rotatably supports the lever 45.
Projection lens L provided in₁Projected through the subject
The infrared spot light reflected from the light receiving lens L₂Through
And then two photo-detecting diodes SPD₁, SPD₂Than
The light is received by the light receiving element 49. Cam lever 4
5, light receiving element 48, light projecting lens L₁, Light receiving lens L₂Oh
And a light receiving element 49 form a distance measuring device of an angle measuring system.
Is made. The subject to be measured is the projection lens L.₁
And light-receiving lens L₂Objective lens Fl provided between₁
And eyepiece Fl ₂The Fiander optical system consisting of
Is observed.

FIG. 8 is a principle diagram of the distance detection of the angle measuring method shown in FIG. In the light receiving element 49, the boundary line Bl between the _two photo detecting diodes SPD ₁ and SPD ₂ has a lens L ₂
Is arranged so as to intersect the optical axis of the
Is first placed at the reference position on the optical axis of the light projecting lens parallel to the optical axis of the light receiving lens L ₂ . In this case, the light emitting element 28
The spot light emitted from the light source is condensed through the light projecting lens L ₁ and forms a light spot at the position of the point b ₁ on the subject B which is substantially in the center of the viewfinder field. The reflected light of the light spot at the point b ₁ forms a light spot at the point C ₁ on _one photodetection diode SPD ₁ through the light receiving lens L ₂ . In such a state, the object distance is not detected yet, and the taking lens is placed at the infinity position in the wide-angle shooting area or the telephoto shooting area.

Next, when the taking lens is extended from the infinity position, the light emitting element 48 rotates clockwise around the center 0 of the light projecting lens L ₁ in accordance with the amount of extension. As a result, the light spot at the point b ₁ on the subject B becomes a point b 1.
Move toward ₂ . When the light spot on the subject B reaches the point b ₂ on the optical axis of the light receiving lens L ₂ , the reflected light of the light spot is received through the light receiving lens L ₂ and two light detection diodes SPD ₁ and SPD ₂ A reflection spot is formed at a point C ₂ on the boundary line Bl of the. Therefore, one S
The output of PD _{1 and} the output of the other SPD ₂ become equal,
The focus position is detected. A motor control circuit (not shown) is activated by the detection signal of the light receiving element 49, and the motor 11
Will stop and the distance will be adjusted automatically.

Now, the distance from the light projecting lens L ₁ to the object is R, the distance (baseline length) between the light projecting lens L ₁ and the light receiving lens L ₂ is D, the turning angle of the light emitting element 28 (that is, the rotation of the cam lever 45). If the angle is θ ₁ , the distance to the subject B can be calculated by the following equation.

[0028]

[Formula 1] R = D / tan θ ₁ On the other hand, f is the focal length of the taking lens, R _{0 is} the taking distance, and Δ is the amount of extension of the taking lens from the infinity position, and f is sufficiently smaller than R. Assuming that

[0029]

[Formula 2] There is a relation of Δ = f ² / R ₀ . Here, if R≈R ₀ , then Equation 1 and Equation 2
The following equation is obtained from

[0030]

[Formula 3] Δ = f ² · tan θ ₁ / D That is, the extension amount Δ of the taking lens is proportional to the square of the focal length of the taking lens and the moving amount tan θ ₁ of the light emitting element. However, tan θ ₁ is determined by the distance R to the subject, irrespective of the focal length f of the taking lens, as is clear from Equation 1. Therefore, although it is necessary to change the amount of extension of the base plate 10 for adjusting the distance according to the change of the focal length of the photographing lens, the light emitting element 48 for the same photographing distance.
The amount of displacement of must be equal regardless of the change in focal length.

On the other hand, the extension amount Δ of the photographic lens includes information on the photographic distance R ₀ and the focal length f of the photographic lens, as can be seen from equation (2). Therefore, in the case where a flashmatic device is provided in a bifocal camera capable of switching the focal length of the taking lens, for example, the aperture diameter is further narrowed according to the photographing distance with the aperture value corresponding to two different focal lengths as a reference. As described above, it is necessary to control the diaphragm according to the movement of the taking lens.

In FIG. 1, an arm 50 is fixed to the other end of a rotary shaft 42 having a rotary lever 41 fixed to one end thereof, and a code pattern 51 on a substrate 53 provided on a fixed portion of the camera body 1. A sliding brush 52 that slides on is fixed to one end of the arm 50. Therefore, the sliding brush 52 is rotated and displaced integrally with the rotary lever 41 by the wide-angle interlocking lever 31 and the telephoto interlocking lever 32.

FIG. 9 is an enlarged plan view of an encoder 54 including a code pattern 51 and a sliding brush 52, which outputs a focal length signal and a photographing distance signal. In FIG. 9, ON / OFF is performed by a sliding brush between the code patterns 51A, 51B, 51C and the common pattern 51D.
By doing so, this code pattern forms a 3-bit code. The symbols W1 to W8 indicate the steps of the sliding brush 52 in the wide-angle state, and the symbols T4 to T8 indicate the positions of the steps of the sliding brush 52 in the telephoto state. Pattern 51E
Is a wide-angle / telephoto identification pattern. Table 1 shows the code corresponding to the shooting distance indicated by the code pattern 51 due to the displacement of the sliding brush 52.

[0034]

[Table 1]

The arm 54, the pattern 51, the sliding brush 52 and the substrate 53 constitute an encoder 54. The rotation of the rotary shaft 42 is coded by the encoder 54, and the codes a, b, c and e shown in the above-mentioned attached table are read by the recorder 55 shown in FIG. 10, and the analog output corresponding to this is controlled from the decoder 55. It is output to the circuit 56 and the photographing distance at that time is displayed on the display device 57 via the control circuit 56. Further, the control circuit 56 converts the analog output into a current, and when the flash switch B _SW is turned on when the flash device is used, a control signal is sent to the diaphragm device 7, and the shooting distance based on the output signal of the encoder 54 and the A proper aperture opening is set according to the focal length of the taking lens of. In addition, after the photographing is completed, the base plate 10, the light emitting element 48, and the sliding brush 52 are returned to the infinite positions in accordance with the film winding.

Next, regarding the operation of the interlocking mechanism for moving the light emitting element 48 and the sliding brush 52 in the above embodiment,
The three cases of distance adjustment in the wide-angle shooting range, focal length conversion, and distance adjustment in the wide-angle shooting range will be roughly described in detail. 11 to 14 are operation explanatory views of the interlocking mechanism.
1 is when the base plate 10 is at the infinity position in the wide-angle shooting range,
12 is a plan view when the base plate 10 is extended to a close-up position in the wide-angle shooting range, FIG. 13 is a plan view when the base plate 10 is at an infinite position in the telephoto shooting range, and FIG. Board 10
FIG. 4 is a plan view when is extended to a close-up position in a telephoto shooting area.

First, the distance adjusting operation in the wide-angle state by only the main optical system 4 will be described. When turned from OFF position to the wide angle position W the focal length selection lever 9 in FIG. 4, next to the switch S _W1 is ON, the power supply circuit is turned ON, the dust cover 8 is opened simultaneously. At this time, the base plate 10 is at the infinity position in the wide-angle shooting area as shown in FIGS. 1 and 2, and the tip of one arm 31A of the wide-angle interlocking lever 31 is the first of the interlocking columns 20 as shown in FIG. Engagement protrusion 2
It is pressed against 0A by the biasing force of the torsion coil spring 34. In addition, the first interlocking pin 39 planted in the wide-angle lever 31 engages with the first engaging portion 41a of the rotary lever 41, and the sliding pin 44 planted in the rotary lever 41 is connected to the cam lever. As shown in FIG. 11, the wide angle cam 45A is in contact with the base of the wide angle cam 45A at the infinite position. In this state, the light emitting element 48 is placed on the optical axis of the light projecting lens L ₁ as shown by the solid line in FIG. 8, and the sliding brush 52 of the encoder 54 is at the position of step W8 in FIG. It has been placed.

In the above-mentioned wide-angle shooting preparation completed state, when a subject at a middle distance is captured in the center of the finder field and the release button Bt is pressed, the motor 11 starts rotating and the base plate 10 moves to the left in FIG. Be paid out. By this movement of the base plate 10, the interlocking column 20 also moves to the left, and the wide-angle interlocking lever 31 engaged with the first engaging protrusion 20A is moved by the urging force of the torsion coil spring 34 to move the first engaging protrusion 20A. Figure 1
Following the movement to the left in 1, the pin shaft 33 is rotated counterclockwise.

By rotating the wide-angle interlocking lever 31 in the counterclockwise direction, the first interlocking pin 39 pushes the first engaging portion 41a of the pivoting lever 41 to the right in FIG. 41 against the urging force of the torsion coil spring 43.
Rotate counterclockwise about 2. This rotation lever 4
By the counterclockwise rotation of 1, the sliding pin 44 moves the rotation shaft 4
Turn counterclockwise around 2.

When the sliding pin 44 turns counterclockwise in FIG. 11, the cam lever 45 follows the movement of the sliding pin 44 in accordance with the cam shape of the wide-angle cam 45 by the urging force of the torsion coil spring 47. It rotates clockwise about the shaft 46, and displaces the light emitting element 48 clockwise as shown by the dotted line in FIG. Therefore, the subject is scanned by the light spot emitted from the light emitting element 48. When the reflected spot from the subject at the closest distance position reaches a point C ₂ on the central boundary line Bl of the light receiving element 49, a distance adjusting control circuit (not shown) operates based on the output signal from the light receiving element 49. Power to the motor 11 is cut off,
To stop the rotation of. At this time, the main optical system 4 includes the base plate 1 until the position where the subject illuminated by the light spot is focused.
It rolls out with 0, stops at that position, and completes automatic distance adjustment.

In this case, the rotation of the rotating lever 41 is transmitted to the sliding brush 52 of the encoder 54 via the rotating shaft 42, and the sliding brush 52 is rotated together with the rotating lever 41, so that the sliding brush 52 shown in FIG. Among them, it is rotationally displaced from the position of step W8 toward the position of step W1. Since the rotation angle of the sliding brush 52 corresponds to the amount of extension of the base plate 10 from the infinity position, a distance signal to the object corresponding to the position where the base plate 10 is extended is digitally output from the encoder 54. To be done. The output signal is displayed on the display device 57 in the form of a subject distance or a zone mark via the recorder 55 and the control circuit 56 as shown in FIG. Also,
If using a flash, use flash switch B
_{When the SW} is turned on, the control circuit controls the diaphragm device 7 based on the output signal (distance signal and store distance signal) of the encoder 54, and an appropriate diaphragm diameter is automatically set.

When shooting a subject at a close range, when the camera is pointed at the subject and the release button B _t is pressed, the base plate 10 and the interlocking support column 20 are moved to the position of the chain double-dashed line in FIG. (Position) and is extended by Δ ₁ to reach the closest position shown by the solid line. In this case, the wide-angle interlocking lever 31 rotates counterclockwise by following the first engaging projection 20A by the urging force of the torsion coil spring 34, and the base plate 10
When reaches the shortest distance position, it contacts the control pin 38 and stops as shown in FIG. Further, when the wide-angle interlocking lever 31 is rotated counterclockwise, the first interlocking pin 39 implanted in the wide-angle interlocking lever 31 is rotated by the rotary lever 41.
Is rotated counterclockwise against the urging force of the torsion coil spring 43, and the sliding pin 44 implanted in the rotation lever 41 is angled to the right end in FIG. 12 of the wide-angle cam 45A of the cam lever 45. Rotate by ω ₁ . In response to the movement of the sliding pin 44, the cam lever 45 is rotated clockwise by the urging force of the torsion coil spring 47, and the light emitting element 48 is moved relative to the optical axis of the light projecting lens L ₁ as shown in FIG. Displace clockwise by θ _WN .

Due to the rotational displacement of the light emitting element 48, the reflection spot projected from the light emitting element 48 and reflected by the object at the closest distance is the boundary line Bl of the light receiving element 49 in FIG.
To reach. Then, the light receiving element 49 outputs a reflected spot detection signal, so that the motor 11 stops rotating in response to the output signal, and at that time, the main optical system 4 is placed at the close-range focusing position. Further, at this time, the sliding brush 52 of the encoder 54 that rotates integrally with the rotating lever 41 slides on the code pattern from the position of step W8 to the position of step W1, and the close distance (for example, 0 ．
4m) corresponding code signal is output.

As described above, the distance adjustment in the wide-angle state is performed within the range from infinity to the closest distance. Next, the operation of the interlocking mechanism when switching the focal length will be described. In FIG. 4, the focal length selection lever 9 is switched from the wide-angle position (W) to the telephoto position (T), or
When switching from FF located directly telephoto position beyond the wide angle position (W) (T), the motor 11 is rotated without a switch S _W1 and S _W2 presses turned ON, the release button B _t, base plate 10 Is extended from the infinity position in the wide-angle shooting area to a position close to the close range. Interlocking column 2 with base plate 10
When 0 reaches a close-up position in the wide-angle shooting range, the wide-angle interlocking lever 31 comes into contact with the limiting pin 38 to stop the counterclockwise pivoting, and the pivoting lever 41 engages with the first interlocking pin 39.
12 temporarily stops the rotation at the position shown in FIG. 12 in a state where the sliding pin 44 is in contact with the close-range position of the wide-angle cam 45A.
By this rotation of the rotation lever 41, the second engaging portion 41b of the rotation lever 41 is inserted on the turning path of the second interlocking pin 40 that is planted in the telephoto interlocking lever 32.

When the interlocking strut 20 together with the base plate 10 is extended to the left in FIG. 12 beyond the close-up position in the wide-angle shooting area, the first engaging protrusion 20A of the interlocking strut 20 causes one of the wide-angle interlocking levers 31 to move. Away from the tip of the arm 31A. Base plate 1
When the interlocking strut 20 is extended to the left by d ₁ together with 0, the second engaging projection 20B comes into contact with the tip end portion of one arm 32A of the telephoto interlocking lever 32 to move the telephoto interlocking lever 32 counterclockwise. Rotate. When the base plate 10 is further extended by d _{2 in} FIG. 13, the second interlocking pin 40 planted in the telephoto interlocking lever 32 comes into contact with the second engaging portion 41b of the rotating lever 41. After the base plate 10 has passed the close-up position in the wide-angle shooting range, the second interlocking pin 4 of the telescopic interlocking lever 32
Until 0 comes into contact with the second engaging portion 41b, Δ ₂ (= d ₁ + d
_The movement of the base plate 10 is not transmitted to the rotation lever 41 in the section that moves by ₂ ). After the second interlocking pin 40 contacts the second engaging portion 41b, when the base plate 10 is continuously extended by Δ ₃ , the rotation lever 41 is pushed by the second interlocking pin 40 and moves counterclockwise again. To do. By this re-rotation of the turning lever 41, the sliding pin 44 is turned counterclockwise by an angle ω ₂ from the position of FIG. 12 (the position indicated by the chain double-dashed line in FIG. 13) to the return cam 45B. The cam lever 45 is engaged to rotate the cam lever 45 counterclockwise against the biasing force of the torsion coil spring 47.

As shown in FIG. 13, the sliding pin 44 is for returning.
Overcame the cam 45B and the infinity position of the telephoto cam 45C.
Is reached, that is, the base plate 10 is integrated with the interlocking column 20.
To Δ ₃Just moved and reached the infinity position of the telephoto shooting range
Switch (not shown) that is interlocked with the movement of the base plate 10.
The power supply to the motor 11 is cut off by the
Stops rotating and the base plate 10 also stops at that position at the same time.

Until the base plate 10 reaches the infinity position in the telephoto shooting range beyond the close-up position in the wide-angle shooting range, the sub-optical system 5 is connected to the main optical system via the gear interlocking mechanism as described above. It is inserted on the photographing optical axis behind 4 and is switched to a combined focal length longer than the focal length of the main optical system 4 alone. Further, while the base plate 10 is moving a long distance (Δ ₂ + Δ ₃ ) in the optical axis direction for switching the focal length, the rotation lever 41 moves slightly at an angle ω _{2 as} shown in FIG. Only by rotating the light emitting element 48 to the original position on the optical axis of the light projecting lens L ₁ .

In addition, the sliding brush 52 of the encoder 54 is linked with the rotary lever 41 that slightly rotates according to the movement of the base plate 10 at the end of the focal length switching, and the sliding brush 52 of the encoder 54 corresponds to step W1 in FIG. Slide from the position to the position of step T8. In step T8, since the sliding brush 52 also contacts the pattern 51E, the encoder 54 outputs a focal length identification signal to the control circuit 56 (see FIG. 10) in addition to the infinity signal. The control circuit which receives the focal length identification signal controls the aperture opening so that the same F value is obtained for the two types of focal lengths to be switched. However, when a flash unit is used, the aperture is controlled to be an open aperture by the infinite position signal.

Next, the distance adjusting operation in the telephoto shooting range will be described. Move the focal length selection lever 9 to the telephoto position T
(See FIG. 4), the photographing lens is switched to the combined focal length of the main optical system 4 and the sub optical system 5 as shown in FIG. 3, and the base plate 10 is stopped at the infinity position in the telephoto photographing range. rear,
Pressing the release button B _t, further fed to the distance adjusted by rotating the motor 11 again. In this case, when the interlocking column 20 moves to the left from the infinity position shown by the solid line in FIG. 13, the telescopic interlocking lever 32 rotates counterclockwise. Therefore, the second interlocking pin 40 presses the second engaging portion 41 b of the rotating lever 41 to the right, and resists the biasing force of the torsion coil spring 43 to move the sliding pin 44 together with the rotating lever 41 into the rotating shaft 42. Rotate counterclockwise around. In response to the rotation of the sliding pin 44, the cam lever 45 moves the telephoto cam 4
A torsion coil spring 4 clockwise according to the cam shape of 5C.
It is rotated by the urging force of 7 to displace the light emitting element 48 clockwise about the pin shaft 46.

The light spot scanning is performed by the rotational displacement of the light emitting element 48, and the distance detection in the telephoto state is performed similarly to the distance detection in the wide angle state. If the subject is at the closest position, the interlocking column 20 is extended by Δ ₄ as shown in FIG. 14, and the sliding pin 44 is rotated by the angle ω ₃ together with the rotation lever 41 and is shown by a solid line. Displace to the position. At that time, the light emitting element 48 is configured so that the light projecting lens L ₁
Of inclination by an angle theta _TN with respect to the optical axis, the motor 11 stops rotating when the detection of close range is made, the distance regulation is completed.

On the other hand, the rotation of the rotary lever 41 at the time of adjusting the distance in the above telephoto state is transmitted to the encoder 54 via the rotary shaft 42, and the sliding brush 52 moves over the code pattern 51 in FIG. At step S8, the sliding operation is performed from step T8 to step T4, and a code signal corresponding to the subject distance from infinity (∞) to the closest distance (1.6 m) shown in the above-mentioned appendix is output.

FIG. 15 shows the amount of movement of the base plate 10 (that is, the amount of movement of the interlocking column 20) Δ, the displacement angle of the light emitting element 48 (that is, the rotation angle of the cam lever 45) θ ₁ and the encoder sliding brush 52. FIG. 6 is a diagram showing a relationship with a displacement angle (that is, a rotation angle of a rotating lever 41). The most retracted position of the base plate 10 is the infinity position in the wide-angle state, and with this infinity position as 0, the horizontal axis of FIG. 15 indicates the movement amount of the base plate 10 that moves along the photographing optical axis. Δ is taken. When the base plate 10 is extended by Δ ₁ and reaches the close-up position a point of the wide-angle shooting area A, the rotation lever 41 is pushed by ω _{1 in the} counterclockwise direction by being pushed by the first interlocking pin 39 of the wide-angle interlocking lever 31. Turn to. In the wide-angle shooting area A, both the displacement angle θ of the light emitting element 48 and the displacement angle ω of the encoder sliding brush 52 increase in accordance with the base plate feeding amount Δ.

When the base plate 10 is extended beyond the close-up distance a of the wide-angle shooting area, the rotation of the wide-angle interlocking lever 31 is blocked by the limiting pin 38, so that the rotation lever 41 is placed in a stationary state. The stationary state continues until the base plate 10 is extended by Δ ₂ and the second interlocking pin 40 of the telephoto interlocking lever 32 comes into contact with the second engaging portion 41b of the rotating lever 41 until point b. In the stationary area B, the light emitting element 48 is placed at the displacement angle θ _WN corresponding to the closest distance in the wide-angle shooting area, and the encoder sliding brush 52 is also placed at the position of step W1 rotated by ω _1. .

When the base plate 10 is further extended, it is pushed by the second interlocking pin 40 of the telephoto interlocking lever 32 and the pivot lever 41 pivots counterclockwise again to return the light emitting element 48 to its original position. When the base plate 10 is extended by Δ ₃ , the base plate 10 reaches the infinity position C point in the telephoto shooting area D. In the return region C, the rotating lever 41 rotates by ω ₂ , and the encoder sliding brush 52 reaches the position of step T8.

When the base plate 10 is further extended from the infinity position C point in the telephoto shooting area to the close-up distance position d point, the rotating lever 41 moves the second interlocking pin 4 of the telescopic interlocking lever 32.
The encoder sliding brush 52 is pushed by 0 to rotate by ω _3, and slides to the position of step T4. Further, the light emitting element 48 is displaced by θ _TN . Even in the telephoto shooting area D, the light emitting element 48 and the encoder sliding brush 52 are displaced according to the amount of extension from the point C of the base plate 10.

In the above embodiment, the bifocal camera in which the distance detecting device (48, 49) is equipped with the automatic focusing device for controlling the motor 11 has been described, but the reflection spot reaches the boundary line Bl of the light receiving element 49. At this time, if the lamp for indicating the focus is turned on in the finder, the focal length of the taking lens may be switched and the distance may be adjusted manually. Further, in a bifocal camera not equipped with an automatic focusing device, the turning lever 45
An index may be provided at the free end of the cam lever 45 that follows, and the index may indicate a zone mark in the field of view of the finder, which indicates the shooting distance.

In the above embodiment, the sub optical system is configured to move together with the main optical system to adjust the distance in the telephoto shooting range, but the sub optical system is inserted on the shooting optical axis. Of course, the present invention can be applied to a conventionally known bifocal camera in which only the main optical system is extended to adjust the distance.

[0058]

As described above, according to the present invention, by detecting the position of the lens barrel on the optical axis, the amount of extension of the lens barrel (corresponding to the distance to the subject) and the focus of the taking lens are determined. Since the lens barrel position detecting means capable of electrically detecting the distance information is configured, the detected information can be used for flashmatic control or the like.

Further, since the focal length information and the distance information are constituted by one detecting means, the number of parts is increased (the size of the camera is increased and the cost is increased).
Nor.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a bifocal camera incorporating the embodiment of FIG. 1, showing a first state (wide angle) in which imaging is performed only by a main optical system.

FIG. 3 is a longitudinal sectional view of a bifocal camera incorporating the embodiment of FIG. 1, showing a second state (telephoto) in which an image is taken by adding a sub optical system.

FIG. 4 shows a partially cutaway top view of the camera of FIG.

5 is a perspective view of the base plate in FIG. 1 viewed from the back side.

6 shows a cam curve diagram of the front cam in FIG.

7 is an enlarged plan view of the lever interlocking mechanism portion of the embodiment of FIG.

FIG. 8 is a diagram illustrating the principle of the distance detection device in FIG.

FIG. 9 is an enlarged plan view of the encoder section in FIG.

FIG. 10 shows a diaphragm determination circuit when the embodiment of FIG. 1 is applied to a flashmatic diaphragm device.

11 is an operation explanatory view of the lever interlocking mechanism portion in the embodiment of FIG. 1, showing a plan view when the base plate is at the infinite position in the wide-angle shooting area.

FIG. 12 is an operation explanatory view of the lever interlocking mechanism section in the embodiment of FIG. 1, and shows a plan view when the base plate is at a close-up position in a wide-angle shooting area.

13 is an operation explanatory view of the lever interlocking mechanism portion in the embodiment of FIG. 1, showing a plan view when the base plate is at the infinite position in the telephoto shooting area.

FIG. 14 is an operation explanatory view of the lever interlocking mechanism portion in the embodiment of FIG. 1, and shows a plan view when the base plate is at a close range position in the telephoto shooting area.

FIG. 15 is a diagram showing the relationship between the feed amount of the base plate and the displacement angle of the light emitting element and the encoder sliding brush in the embodiment of FIG.

[Explanation of symbols]

1 Camera Main Body 4 Main Optical System (Shooting Lens) 5 Sub Optical System (Shooting Lens) 20 Interlocking Column (Cooperating Means) 20A First Engaging Protrusion (Cooperating Means) 20B Second Engaging Protrusion (Cooperating Means) 31 Wide Angle Interlocking Lever (first lever means) 39 First interlocking pin (first lever means) 32 Telescopic interlocking lever (second lever means) 40 Second interlocking pin (second lever means) 41 Rotating lever (rotating member) 45 Cam lever (Distance detection device, shooting distance related device) 48 Light emitting element (distance detection device, shooting distance related device) 49 Light receiving element (distance detection device, shooting distance related device) 54 Encoder (shooting distance related device)

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[Procedure amendment]

[Submission date] April 19, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

In order to achieve the above object, the present invention provides a photographing optical system which can be set to a plurality of focal lengths and which is displaced in the optical axis direction to change the photographing distance, and at the time of photographing. In a camera capable of stroboscopic photography having a strobe device for irradiating a subject with illumination light and a diaphragm whose open F value changes according to each focal length, the photographing optical system is displaced according to the distance to the subject. A photographing optical system driving device, a detecting device for detecting a distance signal indicating a photographing distance and an aperture F value of the aperture according to a set focal length based on a position of the photographing optical system, and stroboscopic photographing At the same time, a diaphragm control device for automatically setting the aperture diameter of the diaphragm according to the distance signal detected by the detection device and the open F value is provided.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0058

[Correction method] Change

[Correction content]

[0058]

As described above, in the camera capable of stroboscopic photography according to the present invention, the photographing optical system is driven according to the distance to the subject, and the detection device detects the photographing distance based on the position of the photographing optical system. The distance signal representing is detected. That is, the shooting distance can be set accurately and the shooting distance can be detected accurately. Therefore, it is particularly suitable at the time of stroboscopic photography in which the setting of the shooting distance and the detection of the shooting distance have a great influence on the shooting result. Further, in the camera capable of stroboscopic photography according to the present invention, at the time of stroboscopic photography, the aperture diameter of the aperture is automatically determined based on the distance signal detected by the distance signal detection device and the aperture open F value according to the focal length. Is set to. Therefore, it is possible to set the aperture diameter suitable for the shooting distance in consideration of the open F value that changes according to the set focal length, and it is necessary to set the aperture diameter appropriately according to the shooting distance. It is particularly suitable for stroboscopic photography.

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Claims (1)

[Claims] 1. At least 2 in the optical axis direction of the taking lens.
A first focus adjustment region that is movable to one focal length and that performs focus adjustment at a first focal length; and a second focus adjustment region that performs focus adjustment at a second focal length different from the first focal length. A lens barrel that is movable in each of the focal length regions and a position of the entire lens barrel with respect to a predetermined position in the camera are detected, and the focal length at which the lens barrel is located by the detection, and A multi-focal camera, comprising: a lens barrel position detecting means for electrically detecting an amount of extension of the lens barrel at a focal length.