JPH0664282B2 - Switchable focal length camera - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a focal length switchable camera equipped with a triangulation type automatic focus adjustment device.

[Background of the Invention] As a conventional example of a camera whose focal length can be switched, a photographing optical system is configured with both a main optical system and a sub optical system, and the main optical system is displaced in the optical axis direction and the sub optical system is used as a photographing light beam. It is known that the focal length of the photographing optical system can be switched between wide angle and telephoto by inserting and removing it. The main optical system can reciprocate in three regions of wide angle, focal length switching, and telephoto that are narrowed by the first, second, third, and fourth points arranged from both sides of the film toward the subject side. In the wide-angle range, the photographing optical system is composed of only the main optical system, and has a wide-angle focal length. When the main optical system is extended from the first point to the second point in the wide-angle region, the in-focus object distance changes, for example, from infinity to the closest distance. When the main optical system is extended with the focal length switching area from the second point to the third point, the sub optical system is inserted into the photographing light beam, and the main and sub optical systems form the photographing optical system to focus. The distance is switched from wide angle to telephoto. When the main optical system is extended from the third point to the fourth point in the telephoto area, the in-focus subject distance changes from infinity to the closest distance.

As a conventional example of a triangulation type automatic focus adjusting device, so-called both active and passive types are known. Both have a light emitting system and a light receiving system which are separated from each other,
A light beam is emitted from a light projecting system toward a subject, and the light beam reflected by the subject is received by a light receiving system for distance measurement. The latter is equipped with image receiving systems separated from each other, and both image receiving systems are provided. The distance is measured by detecting the relationship between the subject images formed on the. Each of the systems includes a displacement member that performs a scanning operation for distance measurement. This displacement member is provided in either the light projecting system or the light receiving system in the active system, and in the passive system. It is provided in either of the two image receiving systems. There is also a system in which the scanning operation of the displacement member and the focus adjusting operation of the photographing optical system are linked. An example of linking the scanning operation and focus adjustment operation by the active method is to link the focus adjustment operation to extend the shooting optical system from the position where the subject at infinity is focused to the position where the closest subject is focused. Change the direction of the light beam emitted by the projection system from a subject at infinity to a close object, and set the distance between the subject at which the shooting optical system focuses and the distance of the subject at which the projection system emits light rays. Some are configured to always match. With this configuration, when the light receiving system receives the light emitted from the light projecting system and reflected by the subject in a predetermined state, if the feeding of the taking optical system is stopped, the taking optical system focuses on the subject. Will be there.

Therefore, considering the application of the automatic focus adjusting device in which the scanning operation of the displacement member and the focus adjusting operation of the photographing optical system are linked to the above focal length switching type camera, the following conditions must be satisfied. I found out. That is, the condition is that, when the photographic optical system is focused on a certain subject, the displacement member of the automatic focusing apparatus is different even though the position on the optical axis of the photographic optical system differs between the wide-angle region and the telephoto region. This means that the two must maintain the interlocking relationship so that the positions are the same.

[Object of the Invention] An object of the present invention is to provide a focal length switchable camera equipped with an automatic focus adjustment device which satisfies this condition and has a simple structure.

[Summary of the Invention] In order to achieve this object, a focal length switchable camera of the present invention has a photographic optical system capable of switching between at least first and second focal lengths, and a triangulation type automatic focus adjusting device. The photographing optical system includes a first focal length narrowed by first, second, third, and fourth points arranged at intervals in the optical axis direction, focal length switching, and second focal length. Is capable of reciprocating in each region of the focal length, performs the focus adjustment while moving the first focal length region from the first point toward the second point while exhibiting the first focal length, The focal length switching area is changed from the second point to the third point.
The focal length is moved toward the point to switch the focal length from the first focal length to the second focal length, and the focal length is moved from the third point toward the second point to shift the focal length from the second focal point to the first focal point. The second focal length region is moved from the third point toward the fourth point to perform the focus adjustment while exhibiting the second focal length. The control member includes a control member that is displaced according to a movement amount of the photographing optical system, and a displacement member that is driven by the control member to move forward and backward between a start point and an end point. Distance, focal length switching, second
First, second, and third cam surfaces corresponding to respective focal length regions are continuously provided, and the photographing optical system directs the first focal length region from the first point to the second point. As the lens moves forward, the displacement member follows the first cam surface and moves forward from the start point to the end point for distance measurement, and the photographing optical system moves the focal length switching area to the second point. From the end point to the start point, the displacing member follows the second cam surface and moves backward from the end point to the third point. As the third member moves forward from the third point to the fourth point, the displacement member follows the third cam surface and moves forward from the start point to the end point for distance measurement. Is.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 2 to 6, on the front surface of the camera body 1, a dustproof cover 2 is provided in the left-right direction in FIGS. 2 to 4, and a main optical system 3 forming a photographing optical system has its optical axis. Direction (Fig. 2 ~
Displaceable in the vertical direction in FIG. 4), that is to say,
It is provided so that it can be rolled in. Inside the camera body 1, a sub optical system 4 that constitutes a photographing optical system together with the main optical system 3 is provided.
Is displaceable in a direction crossing the optical axis of the main optical system 3 (a left-right direction in FIGS. 2 to 4) between a position inserted in the light beam of the main optical system 3, that is, a position where it is retracted from the light beam. It is provided in.

A focal length selection member 5 for switching the focal length of the photographing optical system is provided on the upper surface of the camera body 1 so as to be always operable.

In FIG. 2, the dustproof cover 2 is in the open position. The focal length selection member 5 is located at the telephoto position where the focal length of the main optical system 3 is in the telephoto region, and faces the letter “T” attached to the upper surface of the camera body 1. The main optical system 3 is located at a projecting position protruding from the front surface of the dustproof cover 2 and constitutes a synthetic optical system together with the sub optical system 4 located at the insertion position and has a focal length in the telephoto area.

In FIG. 3, the dust cover 2 is in the open position. The focal length selection member 5 is at a wide-angle position that sets the focal length of the main optical system 3 to a wide-angle region, and faces the letter “W” attached to the upper surface of the camera body 1. At this time, the main optical system 3 is at the retracted position where it is retracted into the camera body 1 from the retracted position, and the sub optical system 4 is at the retracted position. The main optical system 3 has a wide-angle focal length.

In FIG. 4, the dustproof cover 2 is in the closed position and covers the main optical system 3. At this time, the main optical system 3 is in the retracted position even though the focal length selection member 5 is in the telephoto position, and the sub optical system 4 is in the retracted position. When the dustproof cover 2 is in this closed position, an index 2a attached to the upper surface of the dustproof cover 2 is attached to the upper surface of the camera body 1 in order to make it possible to visually recognize from the upper part of the camera that photography is impossible. The displayed character is "OFF".

As shown in FIG. 2, a switch SW1 interlocking with the dust cover 2 and a switch SW2 interlocking with the focal length selection member 5 are provided in the camera body 1.

The switch SW1 is a sliding section 2b fixed to the dustproof cover 2.
And a conductor land 2c fixed to the camera body 1,
It turns on when the dustproof cover 2 is in the open position, and turns off when it is displaced from the open position toward the closed position. The switch SW1 controls the rotation direction of a motor 12 to be described later that displaces the main optical system 3 and also controls power supply to a shutter control circuit 31 to be described later.

The switch SW2 is composed of a slide piece 5a fixed to the focal length selection member 5 and a conductor land 5b fixed to the camera body 1. The switch SW2 is switched according to the position of the focal length selection member 5, and the main optical system 3 The direction of rotation of a motor 12 described later for displacing is controlled. The switch SW2 is turned on when the focal length selection member 5 is in the telephoto position, and turned off when it is in the wide-angle position.

An inverted Galilean type finder optical system including a first finder optical system 6 having a positive refracting power and a second finder optical system 7 having a negative refracting power is housed in the finder housing 1a above the camera body 1. It is provided.

The finder optical system as a whole is narrowed at the front and narrowed at the back, and a substantially trapezoidal space is formed in the finder storage portion 1a adjacent to the narrowed portion of the finder optical system.

Further, on both sides of the finder optical system are AF (automatic focus adjustment) optical systems 8a and 8b. A projecting element 8c is provided after the AF optical system 8a and a light receiving element is provided after the AF optical system 8b.
8d is provided.

FIG. 1 is a perspective view showing a main optical system displacement mechanism, a finder switching mechanism and other internal mechanisms of this embodiment.

An opening 10a through which a photographing light flux passes is provided in the central portion of the base plate 10, the main optical system 3 is attached to the front portion thereof, and the diaphragm / shutter device 11 shown by an imaginary line is attached thereafter. ing. An FPC (flexible printed circuit board) FPC 11a for transmitting a control signal is extended from the diaphragm / shutter device 11.

A motor 12 is fixed to the upper back surface of the base plate 10, and a bevel gear 12a is fixed to one end of its rotation shaft. A gear 13 pivotally supported by the base plate 10 is engaged with the bevel gear 12a, and a spur gear integrated with the gear 13 is engaged with a gear 14. The gear 14 is held by a holding arm provided upright on the base plate 10 so as to be rotatable but immovable in the axial direction.

A through hole is formed in the center of the gear 14, and a female screw whose center is the rotation center of the gear 14 is cut in the through hole. A male screw cut on the guide shaft 15 is screwed onto the female screw.

The guide shaft 15 extends in the optical axis direction, and as can be seen in FIG. 9, the end is inserted into the base plate 1c of the camera body 1 and set screw.
It is fixed non-rotatably at 15a, the tip side is inserted into the through hole 10b (shown in FIG. 9) of the base plate 10 so as to be slidable in the axial direction, and the tip end is inserted into the camera body 1. .

A guide shaft 16 extending in the optical axis direction is also installed on the substrate 1c. The guide shaft 16 is fitted in the notch 10c of the base plate 10 so as to be slidable in the axial direction.

Further, the base portion of the linear cam plate 17 is fixed to the base plate 10 so as to follow the moving direction of the base plate 10 (the optical axis direction of the main optical system 3), and the linear cam plate 17 has a spring property. And a sliding contact portion 17a is formed at its tip, and the sliding contact portion 17a extends from the substrate 1c to the base plate.
It is slidably pressed against a fixed wall surface (not shown) extending along the moving direction of 10.

With this structure, when the motor 12 rotates, the gear 14
The base plate 10 is moved in parallel in the optical axis direction by the screwing of the guide shaft 15 with the guide shaft 15, and the main optical system 3 and the diaphragm / shutter device 11 fixed to the base plate 10 are provided between the feeding position and the feeding position. Displace in the direction. At this time, by fitting the guide shaft 16 and the notch 10c, the base plate 1
It is prevented that 0 rotates in a plane orthogonal to the optical axis.
Further, the sliding contact portion 17a of the cam plate 17 elastically contacts the fixed wall surface so that the guide shaft 16 and the notch 10c come into contact with each other without backlash. Therefore, the base plate 10 does not decenter the optical axis of the main optical system 3 but moves parallel to the optical axis direction while keeping the optical axis vertical.

On the back surface of the base plate 10, a reduction gear train 25, a cam gear 26, and a driving member.
And 27 are pivotally supported, and the sub-optical system 4 is screwed to and held by the drive member 27 via the support tube 4e. Reduction gear train 25
Input gear 25a is meshed with a spur gear integrated with the gear 13, and the final gear 25b of the reduction gear train 25 is a cam gear 26.
Are in mesh with each other.

The cam gear 26 and the drive member 27 are coaxial with each other, and both are coupled via a front cam 26a provided on the end surface of the cam gear 26.

The reduction gear ratio of the reduction gear train 25 is set as follows.
That is, when the main optical system 3 is in the extended position, the sub optical system 4
Is placed in the insertion position (illustrated by an imaginary line in FIG. 1) inserted in the photographing light beam, and when the main optical system 3 is in the retracted position, the auxiliary optical system 4 is retracted from the photographing light beam (the retracted position). It is designed to be placed in (indicated by a solid line in FIG. 1).

7 and 8 are detailed sectional views of the sub-optical system inserting / removing mechanism.

In the figure, the main optical system 3 is attached to the base plate 10 in front of the opening 10a.
A diaphragm / shutter device 11 is fixedly provided, and a positioning means 28 for the sub optical system 4 is formed behind the opening 10a.
The positioning means 28 is composed of an inner cylindrical surface 28a having the optical axis of the main optical system 3 as its axis, a guide surface 28b in the shape of a platter, and a contact surface 28c orthogonal to the optical axis of the main optical system 3.

A holding cylinder 4a for integrally holding the sub optical system 4 can be engaged with the positioning means 28, and the sub optical system 4 is engaged at the time of the engagement.
Is aligned with the optical axis of the main optical system 3 in the extended position, and the sub optical system 4 is positioned at a predetermined position in the optical axis direction.

This optical axis alignment is performed by inserting a small cylinder 4c protruding from the front end surface 4b of the holding cylinder 4a into the inner cylinder surface 28a of the positioning means 28, and positioning in the optical axis direction is performed by positioning the end surface 4b of the holding cylinder 4a. This is done by contacting the contact surface 28c of the means 28.

The drive member 27 is axially slidably supported by a fixed shaft 10g planted in the base plate 10 via a bearing portion 27a so as to be slidable in the axial direction. The drive member 27 has a circumferential groove 27 in which the sub optical system 4 is loosely fitted.
b is formed.

A collar 4d is provided on the entire outer circumference of the holding cylinder 4a of the sub optical system 4, and a coil spring 29 is inserted between the inner circumferential groove 27b and the collar 4d. The spring 29 serves to urge the sub optical system 4 brought to the insertion position in the direction of contacting the positioning means 28.

A cam gear 26 is also axially supported by the shaft 10g, and a sliding contact portion 27c provided at one end of a drive member 27 can slidably contact a front cam 26a formed on this end surface.

Collars 10h and 10i are fixedly mounted on the shaft 10g so as to sandwich the bearing portion 27a, and a spring 30 is inserted between the collar 10h and the drive member 27. The spring 30 connects the sliding contact portion 27c of the drive member 27 to the cam 26a.
Or presses the front end surface of the bearing portion 27a against the collar 10i.

A locking member 1 for locking the free end 27d of the driving member 27 on the base plate 10
0j and 10k are planted, the locking member 10j locks the swing of the drive member 27 when the sub optical system 4 is brought to the insertion position, and the locking member 10k retracts the sub optical system 4. Locks the swing of drive member 27 when brought into position.

Further, near the end of the locking member 10k, a circular hole 10l into which the small cylinder 4c of the sub optical system 4 brought to the retracted position falls in a loosely fitted state.
Is provided.

FIG. 7 shows a state in which the sub optical system 4 is in the insertion position and is in the complete insertion position in which the auxiliary optical system 4 is engaged with the positioning means 28. The sub optical system 4 also takes the following positions.

That is, although it is in the insertion position, it is pushed up by the front cam 26a and does not engage with the positioning means 28, that is, the incomplete insertion position, which is on the circular hole 10l, but its small cylinder 4c is pushed up by the front cam 26a. It is an incomplete retracted position where it has not fallen into the circular hole 10l, and a complete retracted position where the small cylinder 4c has fallen into the circular hole 10l (shown in FIG. 8).

FIG. 10 and FIG. 11 are front views of the sub-optical system retrograde blocking mechanism that is interlocked with the sub-optical system insertion / removal mechanism.

Blocking plate 3 fixed to blocking gear 30f that meshes with cam gear 26
0a is the first small diameter portion 30b and the first contact surface 30c that are successively connected
And a second small diameter portion 30d and a second engaging surface 30e.
The first engaging surface 30c and the second engaging surface 30e can be engaged with the engaging portions 27e provided near the bearing portion 27a of the drive member 27, respectively.

FIG. 10 shows a state in which the sub optical system 4 is locked at the completely retracted position or incomplete retracted position, and FIG. 11 shows a state at which it is locked at the completely inserted position or the incompletely inserted position. .

FIG. 20 shows a cam diagram of the cam 26a. Cam 26a
Is the first flat section A where the rotation angle Θ is 0 to Θ1 and the head does not change at 0, and the head h is 0 from Θ1 to Θ2.
From the first slope section B that increases linearly from 1 to h1 and the second flat section C where the head h does not change at h1 from Θ2 to Θ3
And a second slope section D where the head h decreases linearly from h1 to 0 from Θ3 to 360 °.

The cam 26a has three functions with respect to the sub optical system 4. The first is the action of displacing the sub optical system 4 in the optical axis direction of the main optical system 3 between the completely inserted position and the incompletely inserted position. The second is the action of displacing the sub optical system 4 in a direction crossing the optical axis of the main optical system 3 between the incompletely inserted position and the incompletely retracted position. The third is the action of displacing the sub optical system 4 in the optical axis direction of the main optical system 3 between the incomplete retracted position and the complete retracted position. Details will be described later.

As shown in FIG. 1, a rack 51 is erected on the back surface of the base plate 10. The rack 51 is guided by a guide shaft 51a in which the base end is planted in the base plate 1c and the front part is loosely fitted to the base plate 10.

The rack teeth 51b engraved on the rack 51 are meshed with a pinion 52a fixed to the lower end of the transmission shaft 52, so that the transmission shaft 52
Passes through a partition plate (not shown) that partitions off the photographing optical system from the finder optical system, the AF optical system, and the like.

The spur gear 52b fixed to the upper end of the transmission shaft 52 is a reduction gear 53a.
A cam member 53 as a control member is pivotally supported on the upper end of the shaft 50 of the gear 53a.

A cam plate 71 is fixed to the cam member 53 (see FIG. 12,
(See FIG. 13). This cam plate 71 is a cam lever described later.
The automatic focus adjustment (hereinafter referred to as AF) device of the active triangulation type 73 or later and the photographing optical systems 3 and 4 are linked. Further, on the upper surface of the cam plate 71, a detection brush plate 61 which is in sliding contact with a printed circuit board 62 described later is planted. The brush plate 61
Is four brushes that are made of the same conductor and that are conductive with each other.
It has 61a, 61b, 61c, 61d.

The reduction gear 53a is provided with a fixing strut 50a standing upright, and a screw 71b inserted into an adjustment long hole 71a formed in a cam plate 71 is screwed onto the upper end of the fixing strut 50a to thereby form a cam plate 71 and a cam. The member 53 is integrally combined with the reduction gear 53a.

The reduction gear 53a has a gear 50b for suppressing backlash.
Are engaged with each other, and the gear 50b is biased in the clockwise direction (arrow direction) by the spring 50c.
A is also urged to suppress backlash between the gears 53a and 52b and between the gear 52a and the rack 51b.

An encoder printed circuit board 62 is arranged above the cam plate 71. The printed circuit board 62 has its central portion locked to the pivot shaft 50 of the cam member 53, and the elongated slot 62a for adjustment is provided in the peripheral portion,
The position is adjusted and fixed by a set screw 62b that is screwed into a screwing emboss formed on the camera body 1.

A plurality of sliding contact patterns (not shown) arranged concentrically around the pivot 50 are provided on the lower surface of the printed circuit board 62, and each pattern has brushes 61a, 61 of the detection brush plate 61.
The tips of b, 61c and 61d are in contact with each other. The brushes rotate around the pivot 50 at an angle of 360 degrees or less in conjunction with the movement of the photographing optical systems 3 and 4 from the infinity position in the wide-angle range to the closest position in the telephoto range. . Each electric signal output from each of the sliding contact patterns digitally changes according to the position where the brushes 61a, 61b, 61c, 61d contact, that is, the position of the photographing optical system. By decoding each of these electric signals, a photographing optical system position signal indicating the positions of the photographing optical systems 3 and 4 can be obtained. In addition, ON / OFF of the switches SW3, SW4, and SW5, which will be described later, are performed by this photographing optical system position signal.
Is controlled.

The switch SW3 is OFF when the main optical system 3 is at the feeding position, the switch SW4 is at the feeding position, and the switch SW5 is OFF when it is between the feeding position and the feeding position. Switch SW
3, SW4 acts as a limit switch, and when the main optical system 3 is displaced to the retracted position or the retracted position, power supply to the motor 12 is cut off.

The switch SW5 is used when the main optical system 3 is at an intermediate position between the above two positions and a subject image cannot be formed on the film surface.
It is a switch for disabling shutter release, and is a switch for cutting off power supply to a shutter control circuit 31 (shown in FIG. 8) described later.

In FIGS. 14 and 15, the cam member 53 serves as a control member of the finder switching mechanism, and the cam groove 54 is formed in the lower portion.
Are engraved, and a drive tooth 53b, a drive tooth 53c and a sliding contact edge 53d that are continuous from the start tooth 53b with one tooth missing are formed on the periphery.

A switching drive member 55 is provided in the vicinity of the cam member 53 so as to be pivotally supported by the finder housing portion 1a via a swing shaft 55a.
The switching drive member 55 includes a start tooth 53b and a drive tooth 53c of the cam member 53.
Fan-shaped part 55d having starting teeth 53b and driving teeth 55c corresponding to
A cam portion 55g composed of a first radial cam surface 55e formed around the swing shaft 55a and a second cam surface 55f which is a circumferential surface, and a cam portion 55g extending radially from the swing shaft 55a. And a swing arm 55h.

A first objective lens 56 having a positive refracting power is fixed to the tip of a support arm 55i extending upward from the tip of the swing arm 55h, and the first objective lens 56 forms a first finder optical system. There is.

The switching drive member 55 is biased clockwise in FIG. 14 by a spring 55j stretched between the switching drive member 55 and a pin projecting from the finder housing 1a.

Second objective lens with negative refracting power forming second finder optical system
57 is swingably supported by a straight holder 58 via a swing shaft 57a, and the straight holder 58 is supported in the finder accommodating portion 1a so as to be straightly movable in the optical axis direction of the finder optical path.

Engaging rod 57 extending downward to the lower end surface of the second objective lens 57
c is projected, and the tip thereof is engaged with the cam portion 55g of the switching drive member 55. The rack 51, the transmission shaft 52, the cam member 53,
The switching drive member 55, the engagement rod 57c, and the like constitute the second finder optical system drive means.

On the other hand, the rack 51, the transmission shaft 52, the cam member 53, the switching drive member
55 and the like constitute the first finder optical system driving means.

The cam groove 54 of the cam member 53 is engaged with a driven pin 59a protruding from the variable-power swing lever 59. The variable-power swing lever 59 has a base end pivotally supported by the main body 1 via a pivot 59b, and is provided between a pin 59c projecting from an end extending from the pivot 59b and a pin 1b fixedly mounted on the main body 1. Further, a toggle spring 59d for holding the variable power swing lever 59 at the telephoto position and the wide-angle position is stretched.

The cam groove 54 of the cam member 53 operates the first circumferential groove 54a that does not move the driven pin 59a, the drive groove 54b that moves the driven pin 59a and swings the variable power rocking lever 59, and the driven pin 59a. It is constituted by a second circumferential groove 54c that does not allow it.

A substantially U-shaped split groove 59e is formed at the tip of the variable power rocking lever 59, and the split groove 59e is extended downward from a direct-acting connecting arm 58d protruding rearward from the straight holder 58. The tip of the vertical movement rod 58e is engaged.

An AF switching device is shown in FIGS. 1, 12, 13, 16, and 17.

That is, a cam surface is formed on the outer periphery of the cam plate 71 by integral molding with synthetic resin, and this cam surface is shown in FIG.
As shown in FIG. 17, a wide-angle area c from the wide-angle infinity point a to the wide-angle close-point b, a transition area d, a standby area e, and a telephoto area h from the telephoto infinity point f to the telephoto close-point g. And are continuously formed. The directions of the light projecting elements 8c corresponding to the wide-angle infinity point a which is the focusing operation start point of the wide-angle area c and the telephoto infinity point f which is the focusing operation start point of the telephoto area h are set to be the same. However, the wide-angle closest point b and the telephoto closest point g are not the same due to the difference in the photographing limit distance. Further, in the present embodiment, since the sub optical system 4 moves integrally with the main optical system 3 in the optical axis direction at the time of insertion, the cam shapes of the wide-angle region c and the telephoto region h are not the same, but the sub optical system 4
In the photographic optical system in which only the main optical system 3 is displaced in the optical axis direction without being displaced in the optical axis direction only by inserting / removing, the cam shape is the same except near the near point.

As shown in FIGS. 1 and 12, a driven end 73a of a cam lever 73 pivotally supported by the camera body 1 via a pivot 72 is in sliding contact with this cam surface, and the driven end 73a biases the cam lever 73. The spring 73b constantly presses against the cam surface.

An engagement pin 73c is fixed to the other end of the cam lever 73, and the engagement pin 73c is engaged with an engagement arm 75a of an interlocking lever 75 pivotally supported by the camera body 1 via a pivot 74. A light projecting element holding lever 76 is pivotally supported via a pivot 74 concentrically with the interlocking lever 75.

The interlocking lever 75 is biased counterclockwise when viewed from above by a spring 75b wound around the pivot 74, whereby the engaging arm 75
The a is in contact with the engagement pin 73c of the cam lever 73. Spring
Since the biasing force of 75b is considerably smaller than the biasing force of the spring 73b, the driven end 73a does not separate from the cam surface of the cam plate 71.

An adjusting eccentric pin 75c is erected at the end of the interlocking lever 75, and the top 75d of the adjusting eccentric pin 75c is a light emitting element holding lever.
It is inserted into the long hole 76a at the end of 76. A tension spring 76b is stretched between the engagement arm 75a of the interlocking lever 75 and the end of the light emitting element holding lever 76.

The interlocking lever 75 and the light emitting element holding lever 76 generally operate integrally.
8c is retained and spring 76c as a whole as shown in FIG.
Is urged downward in the figure so as to come into contact with the end surface of the bearing portion of the camera body 1 and is axially supported by the bearing portion.

FIG. 1 further shows a viewfinder distance display switching mechanism.

That is, the driven lever 82 is connected to the camera body 1 via the pivot 81.
A driven pin that is pivotally supported by and is fixed to one end of the driven lever 82.
82a is engaged with a cam groove 17b formed in the direct acting cam plate 17.

A slide lever 83 is connected to the driven lever 82, and includes a pin 84a, 84b provided upright on the camera body 1 and a slide lever 83.
It is slidably supported in the lateral direction via guide holes 83a and 83b formed in the.

An engagement pin 83c is fixedly installed at one end of the slide lever 83,
The engagement pin 83c is engaged with a fork portion 82b formed at the other end of the driven lever 82.

The slide lever 83 has a fixed lens of the viewfinder optical system.
It is located in front of 7a and has pointers 83d and 83e that selectively appear in the field of view of the finder.

FIG. 18 shows a motor control circuit for driving the optical systems 3 and 4 of this embodiment.

In the figure, the motor 12 is driven by three power supply circuits.

The first path is the positive pole of the power supply E-the switch SW3-the switch S.
W7a-motor 12-switch SW7b-negative electrode path of the power supply E. By supplying power through this path, the motor 12
Rotates to displace the main optical system 3 to the retracted position and the sub optical system 4 to the retracted position.

The second path is the positive pole of the power source E-the switch SW4-the switch S.
W8a-motor 12-switch SW8b-negative electrode path of the power supply E. By supplying power through this path, the motor 12
Rotates in the direction opposite to that of the first path to displace the main optical system 3 to the feeding position and the sub optical system 4 to the insertion position.

Here, the switches SW7a, SW7b, SW8a, and SW8b are semiconductor switches whose opening and closing are controlled by a logic circuit 40 (shown in FIG. 19) described later.

The third path is a path connecting the automatic focus adjustment / shutter control circuit 31 and the motor 12, and the output of the control circuit 31 causes the motor 12 to rotate in the forward / reverse direction to move the optical system back and forth in the optical axis direction. Focus on.

The power supply path of this control circuit 31 has switches connected in series.
SW1a and SW5 are inserted. The switch SW1a is a semiconductor switch controlled by the switch SW1 and opened / closed in the same phase as the switch SW1. The switch SW1a is turned on only when the dust cover 2 is in the open position. The switch SW5 is turned on only when the main optical system 3 is in the extended position and the retracted position (when the sub optical system 4 is in the completely inserted position and the completely retracted position). These prevent the automatic focus adjustment and the shutter from operating when the dust-proof cover 2 and the optical systems 3 and 4 are in positions unsuitable for photographing.

FIG. 19 shows a logic circuit 40 that controls the operation of the motor control circuit of FIG. The logic circuit 40 includes a pair of input terminals 40a and 40b and a pair of output terminals 40c and 40d. The input terminal 40a is between the switch SW1 and the ground resistance,
The input terminal 40b is connected between the switch SW2 and the ground resistance, the output terminal 40c is connected to the control terminals of the switches SW7a and SW7b, and the output terminal 40d is connected to the control terminals of the switches SW8a and 8b.

The input terminal 40a becomes High level when the switch SW1 is ON, that is, when the dust cover 2 is in the open position,
When SW1 is OFF, that is, when the dustproof cover 2 is in the closed position, it becomes Low level.

The input terminal 40b becomes High level when the switch SW2 is ON, that is, when the focal length selection member 5 is in the telephoto position,
When the switch SW2 is OFF, that is, when the focal length selection member 5 is in the wide-angle position, the level becomes Low.

When the output terminal 40c is at a high level, both the switches SW7a and SW7b are turned on, and when at a low level, both are turned off. Output terminal 40
When d is high level, both switches SW8a and SW8b are turned on, and when low level, both switches are turned off.

The input terminal 40a of the logic circuit 40 is connected to one input terminal of the exclusive OR circuit 40e and one input terminal of the NOR circuit 40f. The input terminal 40b is connected to the other input terminal of the exclusive OR circuit 40e and the other input terminal of the NOR circuit 40f.

The output terminals of both circuits 40e and 40f are connected to both input terminals of the OR circuit 40g, respectively. The output terminal of the OR circuit 40g is connected to the output terminal 40c of the logic circuit 40 and the input terminal of the inverter 40h, and the output terminal of the inverter 40h is connected to the output terminal 40d of the logic circuit 40.

The table below shows the positions of the dustproof cover 2, the focal length selection member 5, and the switches SW1, which switch depending on these positions.
SW2 status, logic circuit 40 input terminals 40a, 40b, output terminal 40
c, 40d level, switch SW7a, SW7b, SW8a, SW8b state,
The relationship of the positions of the main optical system 3 and the sub optical system 4 is summarized.

The adjustment performed when assembling the focal length switchable camera having the above configuration will be described.

This adjustment can be roughly divided into the following three.

Adjusting the amount of feeding required for switching the photographing optical systems 3 and 4 from the wide-angle region to the telephoto region to a predetermined value Adjusting the distance between the photographing optical systems 3 and 4 and the film surface to a predetermined value Photographing optical systems 3 and 4 The following is an example of a specific procedure of adjustment for adjusting the phases of the cam member 53 and the like that follow it.

I. The base plate 10 and the main optical system 3, the sub optical system 4, and the sub optical system insertion / removal mechanism attached to the base plate 10 are regarded as one unit,
Attach it to the specified jig. This jig includes a guide member that supports the base plate 10 so that it can be guided in the optical axis direction of the main optical system 3, and a collimator for inspecting the focal lengths of the main optical system 3 itself and the combined optical systems 3 and 4. I have it.

II. The main optical system 3 is used alone to form a photographing optical system in a wide-angle state, and a main optical system is used while using a collimator so that a subject at a first predetermined distance (for example, infinity) forms an image on a surface corresponding to a film surface. 3. Adjust the position of the base plate 10.

III. II. The base plate 10 is extended by a predetermined amount from the adjustment position of 1 and the sub optical system 4 is inserted behind the main optical system 3 to bring the telephoto state. The base plate 10 is fed out by a predetermined amount. Then, the air distance between the main optical system 3 and the sub optical system 4 is adjusted while using the collimator so that the subject at the second predetermined distance (for example, infinity) forms an image on the surface corresponding to the film surface. . Since the sub-optical system 4 is held by the support cylinder 4e screwed to the drive member 27, the sub-optical system 4 is rotated by rotating the support cylinder 4e.
Can be moved in the optical axis direction, and the air gap with the main optical system 3 can be adjusted.

An example of a specific procedure for the adjustment of is as follows.

IV. The unit in which the adjustments I to III have been completed is incorporated into the camera and inserted into the optical path of the collimator.

V. As shown by the solid line in FIG. 2, the main optical system 3 alone constitutes a wide-angle photographing optical system, and the spur gear 52b and the reduction gear 53a are disengaged from each other, that is, the cam member 53 and the photographing optical system 3 are in a disengaged state. The state where the interlocking with 4 is turned off.

VI. After roughly adjusting the base plate 10 that has supplied power to the motor 12 to an approximate position, supply of power to the motor 12 is stopped. And the main optical system 3
However, using a collimator so that a subject at a third predetermined distance (for example, 2.4 m) is imaged on the film surface, the base plate is used.
Make fine adjustments to the 10 position. This is done by loosening the setscrew 15a shown in FIGS. 1 and 9 and fitting the tip of the driver into the slot 15c of the guide shaft 15 to rotate the guide shaft 15. As is clear from FIG. 9, since the guide shaft 15 itself cannot move in the axial direction, it rotates relative to the gear 14,
Since 12 is stopped, gear 14 also does not rotate. Therefore, the base plate 10 moves back and forth in the optical axis direction. When the adjustment is completed, the set screw 15a is fastened to fix the guide shaft 15.

An example of the specific procedure of the adjustment is described below.

VII. Next, adjustment is made to determine the positional relationship of the cam member 53 (cam plate 71) with respect to the photographing optical systems 3 and 4 and the cam lever 73. The state where the adjustment of VI above is completed, that is, the main optical system 3
Is in a position where the subject at a third predetermined distance is imaged on the film surface, the spur gear 52b and the reduction gear 53a are meshed with each other, and the cam member 53 and the photographing optical systems 3 and 4 can be interlocked. To Screw 71 shown in FIGS. 1, 12, and 13
b is loosened so that the cam member 53 (cam plate 71) can rotate within the range of the long hole 71a. Then, as shown in FIG. 12, the indicator attached to the driven end 73a of the cam lever 73 and the cam plate 7
Face the index attached to 1 and fasten the screw 71b. The index of the cam plate 71 indicates the position that the cam plate 71 should take with respect to the driven end 73a when the automatic focus adjusting device detects that the subject is present at the third predetermined distance, and therefore this adjustment is performed. When completed, the position of the cam member 53 (cam plate 71) with respect to the photographing optical systems 3 and 4 and the cam lever 73 is set.

VIII. Next, the position of the encoder printed circuit board 62 with respect to the photographing optical systems 3 and 4 is adjusted. First, the screw 62b is loosened so that the encoder printed board 62 can rotate around the shaft 50 within the range of the long hole 62a. Then, when the photographing optical systems 3 and 4 are focused on the subject at the third predetermined distance, the board 62 is positioned at a position to be taken by the encoder printed board 62, and the screw 62b is fastened. The position to be taken by the substrate 62 means that the photographing optical system position signal indicating that the photographing optical system is focused on the object at the third predetermined distance is provided on the lower surface of the substrate 62 for each sliding contact. It is the position obtained from the pattern.

As described above, the driven end of the cam lever 73 is attached to each of the wide-angle infinity point a, the closest point b, the telephoto infinite point f, and the closest point g of the cam plate 71.
When 73a is facing, the shooting optical system accurately focuses on the objects at infinity in the wide-angle state, close-up in the same state, infinity in the telephoto state, and close-up in the same state. An accurate photographic optical system position signal can be obtained from the contact pattern.

Next, the AF optical system is adjusted. A reference plate is placed on the optical axis of the main optical system 3 at a predetermined object distance (for example, 2.4 m), and the light projecting element 8c is energized to enter the light receiving element 8d. Then, the eccentric pin 75c is rotated to adjust the direction of the light projecting element 8c so that the output of the light receiving element 8d is in a predetermined focus detection state.

The wide-angle region c and the telephoto region h on the cam plate 71 are the first
Since they are separated by a rotation angle corresponding to the predetermined amount of feeding, the entire area of the cam surface of the cam plate 71 can be adjusted only by the above adjustment.

This completes each adjustment.

Next, the operation will be described.

(1) As shown in FIG. 2, the dustproof cover 2 is at the open position,
When the focal length selection member 5 is in the telephoto position and the main optical system 3 is already in the extended position, both switches SW1 and SW2 are in the ON state, so both input terminals 40a and 40b of the logic circuit 40 are at H level.
It becomes the igh level. The output terminals of the exclusive OR circuit 40e and the NOR circuit 40f are at low level, and the output terminal of the OR circuit 40g is also at low level. Output terminal 40 of logic circuit 40
c and 40d are Low and High level, respectively.

As a result, the switches SW7a and SW7b shown in FIG. 18 are turned off and the switches SW8a and SW8b are turned on. Since the main optical system 3 is in the extended position, the switches SW3, SW4, SW5 are turned on,
It is in the OFF, ON state. Since the switches SW7a and SW7b are OFF, the first path is not formed, and since the switch SW4 is OFF, the second path is not formed.

In this case, the main optical system 3 is at the feeding position, and the sub optical system 4 is at the 7th position.
As shown in the figure, they are stationary at the fully inserted position where they are completely engaged with the positioning means 28, and both optical systems form a synthetic optical system, and the focal length thereof is in the telephoto range. Since the switches SW1a and SW5 are both ON, the automatic focus adjustment / shutter control circuit 31 is in an operable state, and shooting with the telephoto optical system is possible.

The finder optical system is also in the telephoto state as shown in FIG. 14 in which the first objective lens 56 is located in front of the second objective lens 57.

With the shooting start operation by pressing the release button (not shown), the motor 12 receives power from the third path and rotates,
The optical systems 3 and 4 are displaced in the optical axis direction between infinity and a close-up position in the telephoto area to perform focus adjustment. The base plate 10 is displaced back and forth together with the main optical system 3 and the sub optical system 4 for focus adjustment in telephoto shooting.

Shooting in the telephoto state and shooting in the wide-angle state are almost the same, and the shooting method will be described later in the wide-angle state.

As shown in FIG. 14, when the cam member 53 rotates in accordance with the rotation of the motor 12 for adjusting the focus in the telephoto area, the vertical movement rod 58e of the rectilinear holder 58 moves the variable magnification swing lever 59.
It is sandwiched between one inner wall of the split groove 59e and the rear end of the guide groove 1f provided in the finder storage portion 1a, and the starting tooth 53b of the cam member 53 and the starting tooth 55b of the switching drive member 55 are separated from each other. , The driven pin 59a of the variable-magnification swing lever 59 is connected to the cam groove 54 of the cam member 53.
Of the first circumferential groove 54a.
Since the driven pin 59a is prevented from coming into contact with the side wall of the 4a, the finder optical system does not operate to be switched or vibrate.

(2) When the focal length selection member 5 is switched from the telephoto state shown in FIG. 2 to the wide-angle state, the switch SW2 is turned off, and the input terminal 40b of the logic circuit 40 shown in FIG. 19 becomes low level. The output terminal of the exclusive OR circuit 40e is H
Since it becomes the igh level, the output terminal of the OR circuit 40g is inverted to the High level, and the output terminals 40c and 40d of the logic circuit 40 are inverted to the High and Low levels, respectively.

As a result, the switches SW7a and SW7b shown in FIG. 18 are turned on and the switches SW8a and SW8b are turned off. The main optical system 3 is in the extended position, and the switches SW3, SW4, and SW5 are ON and OF, respectively.
Since the switches SW7a and SW7b are in the ON state and the switches SW7a and SW7b are in the ON state, the first path is formed and the motor 12 is started. Therefore, the main optical system 3 starts to be displaced from the feeding position toward the feeding position.

The sub-optical system 4 is displaced in the optical axis direction from the complete insertion position (shown in FIG. 7) in which the positioning means 28 is engaged by the initial rotation of the motor 12 to the incomplete insertion position in which it is not engaged. Displace. The displacement in the optical axis direction is due to the cam 26a rotating counterclockwise from the state shown in FIG. 11 and pushing up the sliding contact portion 27c of the drive member 27 in the first slope section B.

Before the cam 26a pushes up the sliding contact portion 27c of the drive member 27 in the first slope section B, the engagement portion 27e of the drive member 27 is located at the first position from the position facing the first small diameter portion 30b of the blocking plate 30a. It comes into contact with the engaging portion 30c. Then, before the sub optical system 4 reaches the incompletely inserted position, the engagement portion 27e releases the engagement with the first engagement portion 30c and reaches the state of facing the second small diameter portion 30d. First
FIG. 1 shows the state immediately before that.

When the sub optical system 4 reaches the incompletely inserted position to release the engagement with the positioning means 28 and the engagement portion 27e faces the small diameter portion 30d, the drive member 27 can swing in the direction crossing the optical axis. As the motor 12 continues to rotate, the sliding contact portion 27c moves to the first slope section B.
It is pushed by and oscillates counterclockwise in the plane crossing the optical axis of the main optical system 3.

At this time, as shown in FIGS. 7 and 8, the end surface of the small cylinder 4c of the sub optical system 4 is a back surface of the base plate 10 which is perpendicular to the optical axis of the main optical system 3.
Swing in the same direction while sliding over 10m. When the main optical system 3 approaches the retracted position, the free end 27d of the drive member 27 comes into contact with the locking member 10k and its swing is prevented, and the sub optical system 4 does not insert into the circular hole 10l. To reach.

Since the motor 12 continues to rotate thereafter, the sliding contact portion 27c of the drive member 27 climbs up the first slope section B of the cam 26a and reaches the second flat section C. At this time, the second engaging portion 30c of the blocking plate 30a engages with the engaging portion 27e of the driving member 27.

Subsequently, the sliding contact portion 27c slides down the second slope section D.
At this time, the action of the spring 30 may cause the sliding contact portion 27c to slide down along the second slope section D and rotate in the clockwise direction to move the sub optical system 4 back toward the insertion position. The movement is blocked by the engagement between the second engagement portion 30e and the engagement portion 27e.

While the sliding contact portion 27c slides down along the second slope section D, the front end surface of the bearing portion 27a contacts the collar 10i as shown in FIG. 8, so that the sliding contact portion 27c moves away from the cam 26a, Although it faces the first flat section A, it reaches a state where it does not contact.

Due to this displacement of the drive member 27 in the optical axis direction, the small cylinder 4c of the sub optical system 4 is inserted into the circular hole 10l of the base plate 10, and the holding cylinder 4
The end surface 4b of a comes into contact with the edge of the circular hole 10l to reach the completely retracted position. At this time, the main optical system 3 has reached the retracted position.
At this time, the engagement portion 27e is disengaged from the second engagement portion 30e and faces the first small diameter portion 30b.

The spring 29 supplies the biasing force for inserting the sub optical system 4 into the circular hole 10l after the drive member 27 stops the displacement in the optical axis direction by the front end surface of the bearing portion 27a contacting the collar 10i. .

When the main optical system 3 reaches the retracted position, the switches SW3, SW4, SW5 shown in FIG. 18 are turned off, on, and on, respectively. When the switch SW3 is turned off, the first path is cut off and the power supply to the motor 12 is stopped. Therefore, the main optical system 3
Is the retracted position, and the sub optical system 4 is stationary at the completely retracted position. Therefore, the optical system includes only the main optical system 3,
Its focal length is in the wide-angle range. Also switches SW1, SW
Since both 5 are ON, the automatic focus adjustment / shutter control circuit 31 is in an operable state, and it becomes possible to shoot in a wide-angle range.

Further, the finder optical system is switched by the finder switching mechanism in the following manner in response to the change of the above state. That is, the first finder optical system 6 is moved from the insertion position to the retracted position.

Since the base plate 10 is largely retracted because the telephoto state is switched to the wide-angle state, the rack 51 is largely retracted and the rack teeth are moved.
51b, pinion 52a, transmission shaft 52, spur gear 52b, reduction gear 53a
The cam member 53 is largely rotated by the path of.

The rotation of the cam member 53 causes the activation tooth 53b to push the activation tooth 55b of the fan-shaped portion 55d of the switching drive member 55, and the drive tooth 53c and the drive tooth 55c mesh with each other, between the activation tooth 53b and the drive tooth 53c, and the activation. Since one tooth is missing between the tooth 55b and the driving tooth 55c, smooth meshing is started without interference.

Then, as shown in FIG. 15, since the switching drive member 55 is rotated, the tip end portion of the engaging rod 57c is pushed by the first cam surface 55e, and the second objective lens 57 is centered on the swing shaft 57a. When the tip end of the engaging rod 57c reaches the second cam surface 55f, the second objective lens 57 is held at a constant angle.

Synchronizing with the angular displacement of the second objective lens 57, the first objective lens 56 draws an arc around the cam portion 55g together with the switching drive member 55, and the end when the second objective lens 57 faces the front is blurred. To move.

At this time, the second objective lens 57 is housed in a substantially trapezoidal space formed adjacent to the constricted part of the finder optical system.

Thereafter, the driven pin 59a of the variable-power swing lever 59 reaches the area of the drive groove 54b from the first circumferential groove 54a of the cam groove 54. Then, the variable power rocking lever 59 pivots clockwise about the pivot 59b, whereby the linear holder 58 is pushed forward through the split groove 59e, the driven rod 58e, and the linear motion connecting arm 58d.

When the straight holder 58 is pushed forward, the tip end of the engaging rod 57c is disengaged from the second cam surface 55f of the switching drive member 55, so that the second objective lens 57 faces the front as it was originally.
The rectilinear holder 58 and the second objective lens 57 are pushed out to the original position of the first objective lens 56 without interfering with g, and the variable magnification swing lever 59 is wide angled by the toggle spring 59d. The lens is reversed and held at the position, and the state shown in FIG.

Simultaneously with the switching of the respective systems, the AF system and the display within the finder are switched.

That is, as shown in FIG. 17, in the telephoto state, the driven end 73a of the cam lever 73 is in the telephoto region h of the cam surface of the cam plate 71, but when the cam member 53 rotates, the driven end 73a is
In the telephoto area h, the point passes the telephoto infinity point f, which is the focusing operation start position, and passes through the standby area e, which is the circumferential surface, to the transition area d, enters the wide-angle area c, and switches to the wide-angle state. As shown in FIG. 16, the driven end 73a is located at the wide-angle infinity point a which is the focusing operation start position in the wide-angle area c.

As a result, the light projecting direction of the light projecting element 8c becomes an infinity direction substantially parallel to the optical axis of the main optical system 3.

Further, when the base plate 10 is retracted at the time of switching from the telephoto to the wide angle, the linear cam plate 17 is also integrally retracted to the state shown in FIG. 1, and the driven pin 82a engaged with the cam groove 17b is displaced. ,
The pointer 83e that was visible in the viewfinder in the telephoto state leaves the field of view, and the pointer 83d comes into the field of view.

The motor 12 is supplied with power through the third path and rotates in response to a shooting start operation by a release button (not shown), and the main optical system 3 is extended from the infinity position in the wide-angle range shown in FIG. , Adjust the focus.

As the motor 12 rotates, the gear 14 rotates via the gear 13, and since the gear 14 cannot move back and forth with respect to the base plate 10, the gear 14 moves along the guide shaft 15 together with the base plate 10.

The movement of the base plate 10 is transmitted to the pinion 52a via the rack teeth 51b of the rack 51, and the transmission shaft 52 causes the spur gear 52b and the reduction gear 53 to move.
It is converted into rotational motion and transmitted to the cam member 53 via a.

Since the gear 50b biased by the spring 50c is meshed with the reduction gear 53a, backlash during meshing is suppressed,
Accurately transmitted.

When the reduction gear 53a rotates, the cam member 53 also rotates integrally, the driven end 73a follows the cam surface of the cam plate 71, and the cam lever 73 is rotationally displaced according to the shooting distance. Since the wide-angle shooting is performed, the driven end 73a moves from the infinite point a of the wide-angle area c toward the closest point b. In the case of telephoto shooting, the point moves from the infinity point f in the telephoto area h toward the closest point g.

The displacement of the cam lever 73 appears as a tilt of the light projecting element 8c, and the light beam from the light projecting element 8c is swung from infinity toward the closest direction. When this ray hits the subject, it is reflected there and returns to the light receiving element 8d. The change of the output state of the light receiving element 8d at this time is calculated by the distance measuring device, and the motor 12 is stopped when the focus detection output assumed in advance is reached. At this time, the photographing optical system (main optical system 3) is focused on the subject. When the focusing is completed, the projection of the projection element 8c is also stopped, and shooting is continued.

Since there is inertia in the cam member 53 and others, and there is a deviation between the signal and the stop distance, the cam surface of the cam plate 71 is taken into consideration in consideration of this.

When the base plate 10 moves back and forth, the cam groove 17b of the linear cam plate 17
Causes the slide lever 83 to move laterally via the driven pin 82a, and the pointer 83d moves within the field of view of the finder.Therefore, while looking into the finder, the mark in the field of view indicated by the pointer can be used to know the approximate distance to the subject. it can. In telephoto shooting, the pointer 83e functions similarly.

When the release button is released, the motor 12 is rotated in the reverse direction, the main optical system 3 is moved to the infinity position in the wide angle range, and the driven end 73a of the cam lever 73 faces the infinity point a to prepare for the next photographing. The position is detected by switches SW3, SW4 and SW5.

During rotation of the motor 12 for focus adjustment in the wide-angle region, the sliding contact portion 27c of the drive member 27 only faces the first flat section A and does not contact, so the drive member 27 does not move, and the sub optical system. 4 remains in the fully retracted position.

In the wide-angle state, even if the cam member 53 is rotated for focus adjustment, the vertical movement rod 58e of the straight advance holder 58 is urged by the urging force.
It is sandwiched and held between the inner wall of the split groove 59e of the variable power rocking lever 59 and the front end of the guide groove 1f provided in the finder storage portion 1a.

The driven pin 59a of the variable-power swing lever 59 is connected to the cam groove 5 of the cam member 53.
The second circumferential groove 54c moves within the range of the second circumferential groove 54c.
Since the driven pin 59a does not come into contact with the side wall of the 54c and the driven pin 59a moves within the area of the second circumferential groove 54c of the cam groove 54, the zoom lever 59 does not rock. ,
The ends of the drive teeth 55c of the fan-shaped portion 55d of the switching drive member 55 are cam members.
Since it is in sliding contact with the sliding contact edge 53d of 53, the second objective lens 57
It does not displace and is held stably.

(3) When the dust cover 2 is displaced from the open position to the closed position from the telephoto state, the switch SW1 turns off, the input terminal 40a of the logic circuit 40 becomes Low level, and the output terminal of the exclusive OR circuit 40e. Becomes High level. The following operation is the same as in (2). Even though the focal length selection member 2 is at the telephoto position, the main optical system 3 is displaced from the extended position toward the retracted position, and the sub optical system 4 is at the fully inserted position. To the complete retracted position.

When the main optical system 3 is displaced to the retracted position, the dustproof cover 2 can be displaced to the closed position. When dust cover 2 reaches the closed position, switch SW1a in phase with switch SW1
Is turned off, the power supply to the automatic focus adjustment / shutter control circuit 31 is cut off, and shooting is impossible.

Similarly, in the finder optical system, the AF system, etc., the telephoto position is switched to the wide-angle position.

(4) When the dustproof cover 2 is displaced from the wide-angle state to the closed position, the switch SW1a, which is in phase with the switch SW1, is turned off, so the power supply to the automatic focus adjustment / shutter control circuit 31 is cut off and photography is impossible. Becomes

(5) When the focal length selection member 5 is switched from the wide-angle state shown in FIG. 3 to the telephoto position, the switch SW2 is turned on, and the input terminals 40a and 40b of the logic circuit 40 shown in FIG. 19 are both at the high level. Becomes Exclusive OR circuit 40e,
Since the output terminals of the NOR circuit 40f are both at the Low level, the output terminals of the OR circuit 40g are inverted to the Low level and the logic circuit 40f
Output terminals 40c and 40d are inverted to low and high levels, respectively.

As a result, the switches SW7a and SW7b shown in FIG. 18 are turned off and the switches SW8a and SW8b are turned on. Since the main optical system 3 is in the retracted position, the switches SW3, SW4 and SW5 are respectively OF
F, ON, ON status. Switches SW8a and SW8b are ON,
Since the switch SW4 is ON, the second path is formed, and the motor 12 starts rotating in the direction opposite to that in the case of (2).
Therefore, the main optical system 3 starts to be displaced from the feeding position toward the feeding position.

By the initial rotation of the motor 12, the sub optical system 4 is displaced from the complete retracted position shown in FIG. 8 in the optical axis direction, comes out of the circular hole 10l, and is displaced to the incomplete retracted position. The displacement in the optical axis direction is due to the cam 26a rotating and pushing up the sliding contact portion 27c of the drive member 27 in the second slope section D.

Before the cam 26a pushes up the sliding contact portion 27c of the drive member 27 in the second slope section D, the engagement portion 27e of the drive member 27 is moved from the position facing the first small diameter portion 30b of the blocking plate 30a to the second position. It comes into contact with the engagement portion 30e. Then, before the sub optical system 4 reaches the incomplete retracted position, the engagement portion 27e releases the engagement with the second engagement portion 30e and reaches the state of facing the second small diameter portion 30d. Tenth
The figure shows the state immediately before this.

After that, the secondary optical system 4 reaches the incomplete retracted position and reaches the circular hole 10l.
When the drive member 27 is released from the position, the drive member 27 can swing in the direction crossing the optical axis of the main optical system 3.

As the motor 12 continues to rotate, the sliding contact portion 27c is pushed in the direction crossing the optical axis by the second slope section D, so that the driving member is driven.
27 swings in the same direction, and the end surface of the small cylinder 4c of the sub optical system 4 is the base plate.
While sliding on the backside 10m of 10, go from the incomplete retracted position to the incompletely inserted position.

When the main optical system 3 approaches the extended position, the free end of the drive member 27
27d abuts on the locking member 10j and is prevented from swinging, and the sub optical system 4 stops at the incompletely inserted position. After that, the motor 12
Continues rotating, the sliding contact portion 27c of the drive member 27 moves up the second slope section D of the cam 26a and reaches the second flat section C. At this time, the first engagement portion 30c of the blocking plate 30a engages with the engagement portion 27e of the drive member 27.

Subsequently, the sliding contact portion 27c slides down the first slope section B as shown in FIG. At this time, the action of the spring 30 causes the drive member 27 to rotate counterclockwise along the first slope section B,
Although the sub optical system 4 may move back in the retracted position direction, the engagement portion 27e is engaged with the first engagement portion 30c and blocked.

While the sliding contact portion 27c slides down the second slope section D, the front end surface of the bearing portion 27a contacts the collar 10i, so the sliding contact portion 27c separates from the cam 26a and faces the first flat section A, but contacts. It reaches a state not to do.

Due to the displacement of the drive member 27 in the optical axis direction accompanying this, the small cylinder 4c of the holding cylinder 4a of the sub optical system 4 is guided by the guide surface 28 of the positioning means 28.
After abutting against b, it is guided and inserted into the guide surface 28a, and the end surface 4b of the holding cylinder 4a abuts against the abutting surface 28c of the positioning means 28 to reach the complete insertion position shown in FIG. System 4
The positioning is completed. At this time, the main optical system 3 has reached the delivery position. At this time, the engagement portion 27e is disengaged from the first engagement portion 30c and faces the first small diameter portion 30b.

The bearing member 27a comes into contact with the collar 10i, so that the driving member 27
The spring 29 supplies a biasing force for engaging the sub optical system 4 with the positioning means 28 after the stop of the displacement in the optical axis direction.

When the main optical system 3 reaches the extended position, the switches SW3, SW4, and SW5 are turned on, off, and on, respectively, as described in (1). When the switch SW4 is turned off, the second path is cut off and the power supply to the motor 12 is stopped. Therefore the first
As shown in the figure, the main optical system 3 is at the extended position and the sub optical system 4
Are stationary at the full insertion position, and a synthetic optical system is formed, and the focal length thereof is in the telephoto range. Also switch SW
Since both 1a and Sw5 are ON, the automatic focus adjustment / shutter control circuit 31 is in an operable state, and shooting with the telephoto optical system is possible.

The finder optical system is switched from the wide-angle state to the telephoto state according to the switching operation.

That is, when the main optical system 3 and the sub optical system 4 are switched to the telephoto state, the base plate 10 greatly moves forward, so that the cam member 53 largely rotates contrary to the above.

As a result, the driven pin 59a of the variable-power swing lever 59 is engaged with the cam groove 54.
From the second circumferential groove 54c to the drive groove 54b,
59 rotates counterclockwise to pull back the second objective lens 57 and the rectilinear holder 58 backward.

When the second objective lens 57 and the rectilinear holder 58 retreat, the tip of the engaging rod 57c moves to the second position of the cam portion 55g of the switching drive member 55.
It comes into contact with the cam surface 55f, and the second objective lens 57 is held in a state of being angularly inclined about the swing shaft 57a.

In synchronism with this, the drive tooth 53c meshes with the drive tooth 55c, the switching drive member 55 is rotated clockwise, and the stored first objective lens 56 draws an arc around the swing shaft 55a and rotates clockwise. Turn to.

Next, the tip of the engaging rod 57c is the first cam surface 55 of the cam 55g.
Finally, the second objective lens 57 faces the front, and the straight holder 58 returns to the front of the second objective lens 57 in front of the first objective lens 57.
The telephoto state shown in FIG.

Similarly, the AF system and the viewfinder distance display are also as described in (2) above.
By the operation opposite to the above, the wide-angle state is switched to the telephoto state.

(6) When the dust cover 2 is displaced toward the open position from the state where the dust cover 2 is covered in the telephoto state, the switch SW1
Is turned on, and the input terminals 40a and 40b of the logic circuit 40 are both at the High level. The following is the same operation as described in (5) above.

According to this embodiment, the wide-angle area a, the transition area d, the standby area e,
Since each cam surface of the telephoto area h is formed integrally with the cam plate 71 made of synthetic resin, manufacturing and assembling are simplified.

Further, since the relative position between the cam plate 71 and the photographing optical system can be adjusted by the adjusting mechanisms 71a and 71b, high focus adjustment accuracy can be obtained.

Since the wide-angle area a and the telephoto area h of the cam plate 71 are integrally molded, the relative positions of the two areas cannot be changed. Therefore, the back projection adjustment of the telephoto area is performed by the air gap between the main optical system 3 and the sub optical system 4. It can be done by adjusting.

Incidentally, in the above-described embodiment, the photographing optical system is extended in the direction from the position where the subject at infinity is focused to the position where the closest subject is focused at the time of automatic focus adjustment prior to photographing, but the present invention is not limited to this. Instead, it can also be applied to a structure that is retracted in the opposite direction.

Further, in the above embodiment, the focal lengths of the photographing optical system that can be switched are two types, wide angle and telephoto, but the present invention is not limited to this, and can be applied to a configuration in which three or more types can be switched. .

In the above-mentioned embodiment, the focal lengths of the main optical system and the sub optical system are switched by the electric mechanism, but the present invention is not limited to this. For example, the operating force applied to the focal length selection member 5 or the dustproof cover is applied. Both optical systems may be driven by operating force as a driving force.

"Effects of the Invention" The focal length switchable camera of the present invention has the following effects.

(1) Automatically as the photographing optical system moves forward in the focus switching area and switches the focal length from the first focal length (wide angle in the above embodiment) to the second focal length (telephoto in the above embodiment). Displacement member of the focus adjustment device (members 73, 75, 7 in the above embodiment)
6) from the end point (in the above-mentioned embodiment, the position where the light emitting element 8c is directed to the closest subject at the time of wide angle) (in the above-mentioned embodiment,
Since the light-emitting element 8c is moved back toward the subject at infinity and used for distance measurement not only at the first focal length but also at the second focal length, the configuration becomes simple.

(2) The control member for displacing the displacing member according to the movement amount of the photographing optical system to control the displacing member includes the first (wide-angle region c in the above embodiment), the second (transition region d in the above embodiment), and the third. Each cam surface of the telephoto area h in the above embodiment is continuously provided, and the photographing optical system sets the first focal length area from the first point (the wide-angle infinity position in the above embodiment) to the second point (the above embodiment). In the example, the displacing member is driven by the first cam surface as it moves forward toward the wide-angle close position), and from the starting point (the position in which the light emitting element 8c is directed to the subject at infinity in the above embodiment) to the end point (the above-mentioned example). In the example,
It moves forward for distance measurement toward the closest object in the wide-angle direction (the position where the light emitting element 8c is directed), and the photographing optical system moves the focal length switching region from the second point to the third point (in the above embodiment, the telephoto infinity). As the moving member moves forward toward the position), the displacement member follows the second cam surface and returns from the end point to the start point, and the photographing optical system moves the second focal length region from the third point to the third point. With the forward movement toward four points (in the above-described embodiment, the position closest to the telephoto position), the displacement member follows the third cam surface to move from the starting point to the end point (in the above-described embodiment, the subject at the closest distance in the telephoto position). Light emitting element
Since it is designed to move forward for distance measurement (to the position where 8c is pointed), the shooting optical system and the displacement member in each area can be linked by a single linking mechanism, making the configuration extremely simple and autofocusing. Adjustment can be performed with high precision.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a perspective view schematically showing an internal mechanism of a camera, FIG. 2 is a plan view showing a partially cutaway view of the camera, FIG. 4 is a plan view of the camera, FIG. 5 is a vertical cross-sectional view of the camera, FIG. 6 is a horizontal cross-sectional view of the camera, and FIGS. 7 and 8 are detailed cross-sectional views of the main parts of the auxiliary optical system inserting / removing mechanism. Similarly, FIG. 9 is a schematic cross-sectional view of the main part,
FIGS. 0 and 11 are front views of a blocking mechanism that is interlocked with the auxiliary optical system insertion / removal mechanism, and FIG. 12 is a plan view of the automatic focusing mechanism.
13 is a vertical sectional view of the same, FIGS. 14 and 15 are plan views of the finder optical system switching mechanism, FIGS. 16 and 17 are plan views near the cam plate, and FIG. 18 is an optical system drive motor. FIG. 19 is a control circuit diagram, FIG. 19 is a logic circuit diagram for controlling the operation of the motor control circuit, and FIG. 20 is a cam diagram. DESCRIPTION OF SYMBOLS 1 ... Camera main body, 1a ... Finder storage part 3 ... Main optical system, 4 ... Sub optical system 10 ... Base plate, 12 ... Motor 26 ... Cam gear, 27 ... Drive member 51 ... Rack, 53 ... Cam member 55 ... Switching drive member , 56 ... First objective lens 57 ... Second objective lens, 61 ... Detection brush plate 62 ... Encoder printed circuit board 71 ... Cam plate, 73 ... Cam lever

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location 9119-2K G02B 7/11 P

Claims (1)

[Claims] 1. A focal length switching type camera having a photographic optical system capable of switching between at least first and second focal lengths and having a triangulation type automatic focus adjusting device, wherein the photographic optical system comprises: It is possible to reciprocate in each region of the first focal length, the focal length switching, and the second focal length narrowed by the first, second, third, and fourth points arranged at intervals in the axial direction, The first focal length region is moved from the first point toward the second point to perform focus adjustment while exhibiting the first focal length, and the focal length switching region is moved from the second point to the second point. Three
Moving forward toward a point and switching from the first to the second focal length, returning from the third point toward the second point and switching from the second to the first focal length, The second focal length region is moved from the third point toward the fourth point to perform focus adjustment while exhibiting the second focal length, and the automatic focus adjustment device adjusts the movement amount of the photographing optical system. And a displacement member that reciprocates between a start point and an end point in response to the control member. The control member includes the first focal length, focal length switching, and second
First, second, and third cam surfaces corresponding to respective focal length regions are continuously provided, and the photographing optical system directs the first focal length region from the first point to the second point. As the lens moves forward, the displacement member follows the first cam surface and moves forward from the start point to the end point for distance measurement, and the photographing optical system moves the focal length switching area to the second point. From the end point to the start point, the displacing member follows the second cam surface and moves backward from the end point to the third point. As the third member moves forward from the third point toward the fourth point, the displacement member follows the third cam surface and moves forward from the start point to the end point for distance measurement. A focal length switchable camera equipped with a focus adjustment device.