JPS60172032A - Optical system switching type camera - Google Patents

Abstract

PURPOSE:To switch a finder optical system even in a narrow space, and to make it unnecessary to make a camera large-sized by inclining one of plural finder optical systems and making it escape, and displacing the other, so that they interfere with each other. CONSTITUTION:When a main optical system 3 and a sub-optical system 4 are switched to a telephoto state, a cam plate 53 rotates greatly. An oscillating lever 59 turns counterclockwise, and draws backward the second objective lens 57 and a straight running frame 58. The tip part of an engaging rod 57c contacts the second cam surface 55f of a cam part 55g of a switching driving member 55, and the second objective lens 57 is held in an angularly inclined state around an oscillating shaft 57. Following it, a driving tooth 53c is engaged with a driving tooth 55c, the switching driving member 55 is turned clockwise, and the first objective lens 56 draws an arc around an oscillating shaft 55a and turns clockwise. Subsequently, the tip part of the engaging rod 57c reaches the first cam surface 55e of the cam part 55g, and in the end, the second objective lens 57 turns to the front, the straight running frame 58 is reset in front of the front of the second objective lens 57, and a camera becomes a telephoto state.

Description

Detailed Description of the Invention "Technical Field of the Invention" The present invention includes a main optical system and a sub-optical system. relates to an optical system switching type camera that is capable of telephoto shooting.

``Background of the Invention'' In an interchangeable optical system ν camera, in order to avoid photographing errors, when the optical system is switched, the finder optical system must also be switched accordingly.

The finder optical system is generally installed in a very narrow space in a part of the camera. However, if an attempt is made to automatically switch the finder optical system when switching the camera optical system, interference is likely to occur when the members are moved. As a result, the means for switching the finder optical system becomes large, leading to an increase in the weight and size of the camera, and the problem that it becomes unsightly.

[Object of the Invention] An object of the present invention is to provide an optical system switching type camera that solves the above-mentioned problems by making it possible to switch the finder optical system even in a narrow space.

"Structure of the Invention" In order to achieve the above object, the present invention includes: a photographing optical system whose optical action can be switched; a first finder optical system; a second finder optical system that can be displaced from a circular position of the displacement locus of the first finder optical system to a position outside the displacement locus; a first finder optical system drive means for displacing the first finder optical system between the insertion position and the retracted position; while the first finder optical system is displaced in conjunction with the switching operation of the photographing optical system; and a second finder optical system drive means for displacing the first finder optical system from the circular trajectory position to a position outside the trajectory, and when displacing the first finder optical system, normally the first finder optical system is By temporarily retracting the second finder optical system located within the displacement locus to outside the displacement locus, the first finder optical system is moved and switched along a minimum path.

"Example" Hereinafter, one embodiment of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, a focal length selection member 2 is provided on the rear surface of the camera body 1, and a switch SWI and a focal length selection member that are connected to a dustproof cover (not shown) are provided inside the camera body 1. A switch SW2 interlocked with the member 2 is provided.

A main optical system 3 is provided on the front side of the camera body 1 so as to be movable in the direction of its optical axis (in the left-right direction in the figure), that is, to be retractable and extendable. Inside the camera body l, a sub optical system 4 is provided in a direction (a direction transverse to the optical axis of the main optical system 3) between a position where it is inserted into the light beam of the main optical system 3, that is, a shooting light beam, and a position where it is withdrawn from the light beam. It is provided so that it can be displaced in the vertical direction (in Fig. 1).

A plurality of finder optical systems including a first finder optical system 5 and a second finder optical system 6 are provided in the upper part of the camera body 1 and housed in a finder housing 1a.

The switch SWI is set to be OFF when the dustproof cover covers the main optical system 3, and to be ON when the front surface of the main optical system 3 is open. Further, the switch SW2 is set to be turned on when the focusing distance selection member 2 is at the telephoto position, and turned off when it is at the wide-angle position.

FIG. 3 is a perspective view showing the main optical system displacement mechanism and finder system switching mechanism of this embodiment.

This figure shows the state when the main optical system 3 is in the extended position. There is an opening 1 in the center of the plywood lO through which the photographing light flux passes.
0a, and in front of it are fixedly installed an aperture/shutter device 11 and a main optical system 3, which are shown by dashed lines. A motor 12 is fixedly installed on the upper back surface of the base plate 10. Both ends of the rotating shaft penetrate through both end faces of the casing of the motor 12 and protrude, respectively. A bevel gear 12a (shown in FIG. 4) is fixed to one end of the rotating shaft. A bevel gear 13 pivotally supported by a plywood lO meshes with this bevel gear +2a, and a gear 14, which is also pivotally supported by a base plate, meshes with the spur tooth portion of this gear 13.

A through hole is formed in the center of the gear 14, and a female thread is cut in the through hole with the rotation center of the gear 14 as the axis. A male thread cut on the guide shaft 15 is screwed into this female thread. The guide shaft 15 extends in the optical axis direction, and its end is fixed to the substrate 1C of the camera body 1, and its tip is inserted into the through hole 10b of the base plate 10 so as to be slidable in the axial direction. A bevel gear 12b is fixed to the other end of the rotating shaft of the motor 12. The bevel gear 12b is engaged with the bevel gear 1B, which is pivotally supported on the base plate 10, and the spur teeth of this gear 16 are engaged with the input gear 1? of the gear train 17, which is pivotally supported on the base plate 10. a are engaged. Output gear 1 of gear train 17
A through hole is formed in the center of 7b, and a female thread is cut in this through hole with the rotation center of gear +7b as the axis. A male thread cut into the guide shaft 18 is screwed into this female thread. The guide shaft 18 extends in the optical axis direction,
The end is fixed to the circuit board IC of the camera body, and the tip is made of plywood 1.
It is inserted into the through hole 10c of No. 0 so as to be slidable in the axial direction.

The amount and direction of rotation of the gear 14° 17b with respect to a certain amount of rotation of the motor are set to be equal, and the conditions for the screwing of the gear 14 and the guide shaft 15 and the screwing of the gear 17b and the guide shaft 18 are also set. are set equal. A guide shaft 18 extending in the optical axis direction is also implanted in the substrate IC. Guide shaft 18
is inserted into a through hole 10e of an overhang 10d protruding from the back surface of the plywood 10 and a through hole 10f of the base plate 10 so as to be slidable in the axial direction.

With such a configuration, when the motor 12 rotates, the plywood lO remains perpendicular to the optical axis and rotates in the optical axis direction due to the screwing of the gear 14 and the guide shaft 15 and the screwing of the gear +7b and the guide shaft 18. a main optical system 3 that is moved parallel to and fixed to it;
The aperture/scanter device 11 is displaced in the optical axis direction between an extended position and a retracted position.

A printed circuit board 20 is fixed to the right side surface of the base plate 10. A conductive land 20 is provided on the surface of this printed circuit board 20.
a to 20c are provided, and three sliding contact pieces 21 to 23 fixed to the camera body are slidable on these, respectively. The sliding contact piece 21 and the conductor land 20a make up the switch SW3, the sliding contact piece 22 and the conductor land 20b make up the switch SW4, and the sliding contact piece 23 and the conductor land 20c make up the switch SW3.
and constitute a switch 5llI5, respectively. The switch SW3 is turned off when the main optical system 3 is in the retracted position, the switch SW4 is turned off when it is in the extended position, and the switch SW5 is turned off when it is located between the retracted position and the extended position. Switches SW3 and SW4 function as limit switches and cut off the power supply to the motor 12 when the main optical system 3 is displaced to the retracted position or the extended position. The switch SW5 is a switch that prevents the shutter release from being performed when the main optical system 3 is at a position between the above two positions and a subject image cannot be formed on the film surface, and is a switch that prevents the shutter release from being performed. This is a switch for cutting off power supply to the circuit 31 (shown in FIG. 8).

It should be noted that the film 24 is attached to the photographing aperture 1d made in the substrate 1c.
located behind the

FIG. 4 is a perspective view of a sub-optical system attachment/detachment mechanism provided on the back surface of the base plate 10.

In the figure, a reduction gear train 25, a cam gear 26, and a drive member 27 are pivotally supported on the back surface of one plywood lO, and the drive member 27 holds the sub optical system 4. Reduction gear train 2
The input gear 25a of No. 5 is meshed with the spur tooth portion of the bevel gear 13, and the final gear 25b of the reduction gear train 25 is meshed with the cam gear 2B. The cam gear 26 and the drive member 27 are coaxial, and are coupled via a front cam 28a provided on the end surface of the cam gear 26.

The reduction 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 (shown by a solid line) inserted into the photographing light beam, and when the main optical system 3 is in the extended position, the sub optical system 4 is placed in the inserted position (shown by a solid line). 4 is placed at a retracted position (indicated by a two-dot chain line) where it is retracted from the photographing light beam.

FIG. 5 shows a sectional view of the sub-optical system mounting/detaching mechanism.

In each figure, a main optical system 3 and an aperture/shutter device 11 are fixedly installed on a base plate 10 in front of an aperture 10a.

Positioning means 28 for the sub optical system 4 is located behind the opening 10a.
is formed. The positioning means 28 includes an inner cylindrical surface 28a centered on the optical axis of the main optical system 3, and a cone-shaped guide surface 2.
8b, and an abutting surface 2ac perpendicular to the optical axis of the main optical system 3. A holding cylinder 4a that integrally holds the sub-optical system 4 is engageable with the positioning means 28, and when the sub-optical system 4 is engaged, the optical axis of the sub-optical system 4 is aligned with the optical axis of the main optical system 3 in the extended position. The sub optical system 4 is aligned with the optical axis, and the sub optical system 4 is positioned at a predetermined position in the direction of the optical axis. This optical axis alignment is achieved 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. This is accomplished by contacting the contact surface 28c of the positioning means 28.

The driving member 27 is fixed @hlOg planted on the plywood 10.
is pivotally supported to be slidable in the axial direction via a bearing portion 27a. The drive member 27 is formed with an inner circumferential groove 27b that accommodates the sub optical system 4 in a loosely fitted state. A collar 4d is provided on the outer circumference of the holding cylinder 4a of the sub optical system 4, and a coil spring 28 is provided between the inner circumferential groove 27b and the collar 4d.
is inserted. This spring 28 functions to bias the sub-optical system 4 brought to the insertion position in a direction in which it comes into contact with the positioning means 28 . A cam gear 26 is also pivotally supported on @l+lOg, and a front cam 28a formed on this end face
A sliding contact portion 27c provided at one end of the drive member 27 can be slidably contacted. A collar 10h, ]Oi is fixed to the shaft log so as to sandwich the bearing portion 27a, and a spring 30 is inserted between the collar 10h and the driving member 27. Spring 3
0 is the sliding contact portion 2 of the drive member 27? c to the cam 28a or the bearing part 2? It functions to press the front end surface of a against the tsuba IQi. Locking members 10j and 10k are implanted in the plywood 10 to lock the drive member 27 free @27d, and the locking members 10j lock the drive member 27 when the sub optical system 4 is brought to the insertion position. The locking member 10 locks the swinging of the drive member 27 when the sub optical system 4 is brought to the retracted position. Further, near the end of the locking member 10, a circular hole 10Q is provided into which the small cylinder 4c of the sub-optical system 4 brought to the retracted position is loosely fitted.

Figure ff15 shows the state when the sub optical system 4 is in the insertion position and in the fully inserted position where it is engaged with the positioning means 28. The sub optical system 4 also takes the following positions. That is, there is an incomplete insertion position where the small cylinder 4c is pushed up by the front cam 2fla and does not engage the positioning means 28, although it is in the insertion position, and the small cylinder 4c is pushed up by the front cam 26a and is not engaged with the positioning means 28, although it is above the circular hole 10Q. In the incompletely retracted position where the small cylinder 4c has not fallen into the circular hole 10Q, the small cylinder 4c is in the circular hole 10. It is in a completely retreated position.

FIG. 6 shows a cam diagram of the cam 28a.

The cam 26a has a lifting height of 0 as the rotation angle O ranges from 0 to 01.
A first flat section A where the lift does not change at , the lifting height is h from e3 to 3606
and a second slope section decreasing linearly from l to 0.

The cam 28a has three effects on the sub-optical system 4.

The first effect is to displace the sub optical system 4 in the optical axis direction of the main optical system 3 between the complete insertion position and the incomplete insertion position.

The second effect is to displace the sub optical system 4 between the incomplete insertion position and the incomplete retraction position in a direction transverse to the optical axis of the main optical system 3. The third effect is to displace the sub optical system 4 in the optical axis direction of the main optical system 3 between the incompletely retracted position and the completely retracted position. The details will be described later.

FIG. 3 shows a finder optical system switching mechanism. The first finder optical system 5 is in the insertion position.

As shown in the figure, a rack 51 is erected on the back side of the plywood 10, and the rack 51 is guided by a guide shaft 51a whose base end is implanted in the substrate 1c and whose front part is loosely fitted into the plywood 10. ing.

A pinion 52a fixed to the lower end of the transmission member 52 is engaged with rack teeth 51b carved on the rack 51, and a spur gear 52b at the upper end of the transmission member 52 is engaged with the cam plate 5.
It is meshed with a reduction gear 53a fixed to No. 3.

A cam groove 54 is carved on the top surface of the cam plate 53.
A starting tooth 53b, a continuous driving tooth 53c with one tooth missing from the starting tooth 53b, and a sliding contact edge 53d are formed on the peripheral edge.

A switching drive member 55 is provided adjacent to the cam plate 53 and is pivotally supported by the finer storage portion 1a via a swing shaft 55a. The switching drive member 55 includes activation teeth 55b corresponding to the activation teeth 53b and drive teeth 53c of the cam plate 53,
A cam 6ti consisting of a fan-shaped portion 55d having driving teeth 55c, a first cam surface 55e extending in a substantially radial direction formed around the swing shaft 55a, and a second cam surface 55f being a circumferential surface.
55g, and a swinging arm 55h extending radially from the swinging shaft 55a.

A first objective lens 56 is fixed to the tip of a support arm 55i extending upward from the tip of the first moving arm 55h, and this first objective lens 56 forms a first finder optical system. The switching drive member 55 is biased clockwise when viewed from above in FIG. 3 by a spring 55j stretched between it and a pin protruding from the finder housing 1a.

A second objective lens 57 constituting a second finder optical system is swingably supported on a rectilinear frame 58 via a swing shaft 57a.
The rectilinear frame 58 is supported within the finder housing la so as to be movable rectilinearly in the optical axis direction of the finder optical path. A spring 58b is tensioned between a locking pin 57b projecting downward from the second objective lens 57 and a locking pin 58a projecting downward from the rectilinear frame 58. The locking pin 57b is biased clockwise when viewed from above in FIG. 3, and is held in contact with the lower side 58c of the rectilinear frame 58 so as to face the front. Furthermore, the engagement rod 5 ? which is provided protrudingly from the lower end surface of the second objective lens 57 ? c extends downward, and its tip engages with the cam portion 55g of the switching drive member 55. Said rack 5
1. Transmission member 52. Come play 1=53. Switching drive member 55. The lower engagement member 1S'57c and the like constitute a second finder optical system switching means.

A driven pin 59 a protruding from the swing lever 59 is engaged with the cam groove 54 of the cam plate 53 . The rocking lever 58 has a proximal end pivoted to the finder housing 1a via a pivot 59b, and has a pin 59c projecting further from the pivot 58b to the end and a pin 1 fixed to the finder housing 1a.
A turn-off spring 59d is tensioned between the pivot lever 58 and the pivot lever 59d for holding the swing lever 58 in the telephoto position and the wide-angle position. The cam groove 54 of the cam plate 53 includes a first circumferential groove 54a that does not move the driven pin 59a, and a drive 54b that moves the driven pin 59a and swings the swinging lever 58.
and a second circumferential groove 54c that does not operate the driven pin 59a.

A substantially U-shaped groove 59e is formed at the tip of the swinging lever 58, and a driven rod extending downward from a linear coupling arm 58d that projects rearward from the linear frame 58 is formed in the groove 59e. The tip of 58e is engaged.

FIG. 8 shows a mode control circuit for driving the optical system 3.4 of this embodiment.

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

The first path is the positive electrode of power supply E - switch SW3 - switch SW? a-Motor 12-Switch SW? b - This is the path of the negative electrode of the power source E. By supplying power through this path, the motor 12 rotates, displacing the main optical system 3 to the retracted position and displacing the sub optical system 4 to the retracted position.

The second path is a path from the positive electrode of the power source E to the switch SW4 to the switch 5W8a to the motor 12 to the switch 5W8b to the negative electrode of the power source E. By supplying power through this path, the motor 12 rotates in the opposite direction to that in the first path, displacing the main optical system 3 to the feeding position and displacing the sub optical system 4.
to the insertion position.

Here switches 5W7a, 5W7b, 5W8a, 5W8
b is a semiconductor switch whose opening/closing is controlled by a logic circuit 40 (shown in FIG. 9), which will be described later.

The third path is the automatic focus adjustment/shutter control circuit 31
and the motor 12, and this control circuit 31
The output of the motor 12 causes the motor 12 to reverse rotation, move the optical system back and forth in the optical axis direction, and bring the optical system into focus.

In the power supply path of this control circuit 31, switches 5W1a and SW5 connected in series are inserted. switch 5W
A semiconductor switch 1a is controlled by the Hokki switch 5till and is opened and closed in the same phase as this, and is turned ON only when a dustproof cover (not shown) is in the open position. The switch SW5 is turned ON only when the main optical system 3 is at the extended position and the retracted position (when the sub optical system 4 is at the fully inserted position and the fully retracted position). These prevent automatic focus adjustment and shutter operation when the dustproof cover and optical system 3.4 are in positions inappropriate for photographing.

FIG. 9 shows a logic circuit 40 that controls the operation of the motor control circuit of FIG. This logic circuit 40 includes a pair of input terminals 40a, 40b and a pair of output terminals 40c, 40.
d. The input terminal 40a is connected to the above switch SW.
The input terminal 40b is between the switch SW2 and the grounding resistor, the output terminal 40c is the control terminal of the switches 5W7a and 5W7b, and the output terminal 40d is between the switch SW2 and the grounding resistor.
are connected to the control terminals of the switches 5W8a and 8b, respectively. The input terminal 40a is connected to the old G when the switch SWI is ON, that is, when the dustproof cover is in the open position.
h level, and becomes low level when the switch SWI is OFF, that is, when the dustproof cover is in the closed position.

The input terminal 40b is at the old gh level when the switch SW2 is ON, that is, when the focal length selection member 2 is at the telephoto position, and is at the low level when the switch 5tl12 is OFF, that is, when the focal length selection member 2 is at the wide-angle position. becomes. Output terminal 40c L±, the above switch SW when at High level? Turn on both a and 5W7b, Lo
Both are turned off when the level is w. The output terminal 40d is H
When the level is high, turn on the switches 5W8a and 5W8b, and when the level is low, turn them off.

An input terminal 40a of the logic circuit 40 is connected to one input terminal of an exclusive OR circuit 40e and one input terminal of a 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 the 6-way circuits 40e and 4Of are connected to the re-input terminal of the OR circuit 40g. They are connected to L and X respectively. OR circuit 40g
The output terminal of the inverter 4. is connected to the output terminal 40c of the logic circuit 40 and the input terminal of the inverter 40h. O
The output terminal of h is connected to the output terminal 40d of the logic circuit 40.

The table below shows the position of the dustproof cover, the position of the focal length selection member 2, and the switch SW' that changes depending on these positions.
l,! 3W2 state, input terminal 40a of logic circuit 40,
40b, level of output terminals 40c and 40d, switch 5
The relationship between the states of W7a, 5W7b, 5W8a, and 5W8b, and the positions of the main optical system 3 and the sub optical system 4 is summarized.

(1) As shown in Fig. 1, when the dustproof cover is in the open position, the focal length selection member 2 is in the telephoto position, and the main optical system 3 is already in the extended position, both switches SW1 and SW2 are turned ON. Therefore, the input terminal 40a of the logic circuit 40
, 40b are both at High level. The output terminals of exclusive OR circuit 40e and NOR circuit 40f are L
It becomes ow level, and the output terminal of OR circuit 40g also goes low.
level. Output terminal 40C140d of logic circuit 40
are at Low and High levels, respectively. As a result, the switches 5W7a and 5W7b shown in FIG. 8 are turned off, and the switches 5W8a and 5W8b are turned on. Since the main optical system 3 is in the extended position, as shown in FIG. S oath 4 and SW5 are ON and OF, respectively.
F, is in ON state. Switch SW? Since the switches a and 5W7b are OFF, the first path is not formed, and since the switch 5l1114 is OFF, the second path is not formed either.

In this case, the main optical system 3 is at the feeding position, and the sub optical system 4 is at the fifth position.
As shown in the figure, they each stand still at the fully inserted position where they are fully engaged with the positioning means 28, and both optical systems constitute a composite optical system, whose focal length is in the telephoto range.

Since the switches 5W1a and SW5 are both ON, the automatic focus adjustment φ shutter control circuit 31 is in an operable state, and photography with the telephoto optical system is possible. FIG. 1 shows the state at this time.

In response to the photographing start operation, the motor 12 receives power through the third path and rotates, displacing the optical system 3.4 in the optical axis direction between close range and infinity in the telephoto range, thereby adjusting the focus. During the rotation of the motor 12 for focus adjustment in this telephoto range, the front end surface of the bearing portion 27a of the drive member 27 is rotated by the spring 30.
Since the sliding portion 27c of the driving member 27 is in contact with the collar 10i due to the urging force of the first flat section A of the cam 2[ia]
They are only facing each other, but not in contact with each other. Therefore, the sliding contact portion 27
c does not become a load on the motor 12.

Further, in the finder optical system, the first objective lens 58 is located in front of the second objective lens 57, and as shown in FIGS.
The camera is in a telephoto state as shown in Figure 4 (A).

Main optical system for focus adjustment for telephoto shooting 3. Both the sub-optical system 4 and the plywood lO are displaced back and forth, which causes the cam plate 5 to
3 rotates, the vertically moving rod 58e of the rectilinear frame 58 is held between one inner wall of the split groove 59e of the swing lever 59 and the rear end of the guide groove 1f provided in the finder housing 1a. The starting tooth 53b of the cam plate 53 and the starting tooth 55b of the switching drive member 55 are separated from each other, and the driven pin 59a of the swing lever 58 is connected to the cam groove 54 of the upper cam plate 53.
The movement is within the range of the first circumferential groove 54a, and the driven pin 59a does not come into contact with the side wall of the first circumferential groove 54a. There's nothing to do.

(2) When the focal length selection member 2 is switched to the wide-angle position from the state shown in FIG. 1, the switch SW2 is turned off and the input terminal 40b of the logic circuit 40 becomes Low level. The output terminal of exclusive OR circuit 40e is H
Since it becomes the igh level, the output terminal of the OR circuit 40g is inverted to the old gh level, and the output terminal 40c of the logic circuit 40
, 40d are inverted to the old GH and Low levels, respectively.

This causes the switch SW? shown in FIG. a.

5W7b is turned ON, and switches 5W8a, 5W8b,
becomes OFF. Since the main optical system 3 is in the extended position,
As shown in Fig. 3, switches SW3, SW4, SW
5 is So, n Tsure ON.

Switches 5W7a and 5W7 are in OFF and ON states.
Since b is ON, the first path is formed and the motor 12 is started. Therefore, the main optical system 3 begins to be displaced from the extended position toward the retracted position.

The sub-optical system 4 is displaced in the optical axis direction from the complete insertion position (shown in FIG. 5) where it engages with the positioning means 28 during the initial rotation of the motor 12, to the incomplete insertion position where it does not engage with the positioning means 28. Displace. This displacement in the optical axis direction is caused by the movement of the cam 28a into the third position.
This is done by rotating clockwise from the state shown in the figure and pushing up the sliding contact portion 27c of the drive member 27 in the first slope section B. When the sub optical system 4 reaches the incomplete insertion position and disengages from the positioning means 28, the drive member 27 becomes swingable in the direction transverse to the optical axis. 27c is pushed by the first slope section B and swings clockwise in a plane that crosses the optical axis of the main optical system 3.

At this time, the end face of the small cylinder 4c of the sub-optical system 4 slides on the back surface 10m of the base plate 1o, which is perpendicular to the optical axis of the main optical system 3, and swings in the same direction. 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 is prevented from swinging, and the sub optical system 4 is not inserted into the circular hole 10 and is not fully retracted. reach the position. Since the motor 12 continues to rotate after that, the sliding contact portion 27 of the drive member 27
c ascends the first slope section B of the cam 28a and reaches the second flat section C.

Subsequently, the sliding contact portion 27c slides down the second slope section, but on the way, the sliding portion 27c slides down the receiving shaft portion 2? Since the front end surface of a contacts the collar 10i, the sliding contact portion 27c separates from the cam 28a and the first
Although it faces the flat section A, it reaches a state where it does not come into contact with it. Due to the accompanying 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 10M of the plywood 1o, and the end surface 4b of the holding cylinder 4a abuts the edge of the circular hole 1o. and reach the fully retracted position. At this time, the main optical system 3 has reached the retraction position.

In addition, bearing part 2? After the front end surface of a comes into contact with the collar 10i and the drive member 27 stops displacing in the optical axis direction,
The biasing force for inserting the sub optical system 4 into the circular hole 10 is provided by the spring 2.
8 supplies.

When the main optical system 3 reaches the retraction position, the switch sw3. shown in FIG. SW4. SW5 is -P and OFF
,ON.

becomes the state of When the switch SW3 is turned off, the first path is cut off and power supply to the motor 12 is stopped. Therefore, the main optical system 3 is stationary at the retracted position, and the sub optical system 4 is stationary at the completely retracted position, so the optical system is composed only of the main optical system 3, and its focal length is in a wide-angle range. Further, since the switches 5W1a and 9w5 are both ON, the automatic focus adjustment/shutter control circuit 31 is in an operable state, and photography with the wide-angle optical system is possible.

In response to the photographing start operation, the motor 12 receives power through the third path and rotates, displacing the main optical system 3 in the optical axis direction between close range and infinity in the wide-angle area, thereby adjusting the focus. During the rotation of the motor 12 for focus adjustment in this wide-angle area, the sliding portion 27c of the drive member 27 only faces the first flat section A and does not contact it, so the drive member 27 does not move and the The optical system 4 remains in the fully inserted position.

Then, in response to the change in the state, the finder optical system is renovated as follows by the finder optical system switching mechanism. That is, the first finder optical system 5 is moved from the insertion position to the retracted position.

Because the telephoto state is switched to the wide-angle state, the base plate 10 moves back a lot, so the rack 51 moves back a lot, and the rack teeth 51b, pinion 52a, spur gear 52b, and starting teeth 5
The cam plate 53 is largely rotated by the path 3b. As a result, the starting tooth 53b pushes the starting tooth 55b of the fan-shaped portion 55d of the switching drive member 55, and further the driving tooth 53c and the driving tooth 55c mesh with each other, the starting tooth 53b and the driving tooth 53c.
Since one tooth is missing between the starting teeth 55b and the driving teeth 55c, they start meshing smoothly without interference.

Then, as shown in FIG. 11, the switching drive member 55 is rotated, so that the engagement rod 5? The tip of the engagement rod 57c is pushed, and the second objective lens 57 rotates by a set angle in the counterclockwise direction when viewed from above in FIG. Cam surface 55f
, the second objective lens 57 is held at a constant angle. In synchronization with the angle JK and displacement of the second objective lens 57, the first
The objective lens 56 is connected to the cam portion 55 together with the switching drive member 55.
12 and 14.
The state shown in Figure (B) is reached.

Thereafter, the driven pin 59a of the swing lever 59 reaches the area of the drive groove 54b from the first circumferential groove 54a of the cam groove 54.

Then, the swing lever 58 moves to the third position around the pivot shaft 59b.
It rotates clockwise when viewed from the top of the figure, thereby pushing the rectilinear frame 58 forward via the split groove 58e, the driven rod 58e, and the linearly moving connecting arm 58d. When the rectilinear frame 58 is pushed forward, the tip of the engagement rod 57c comes off the second cam surface 55f of the switching drive member 55, so the second objective lens 57 faces forward as before and interferes with the cam portion 55g. The rectilinear frame 58 and the second objective lens 57 are pushed out to the original position of the first objective lens 56, replacing the first objective lens 5B, and the swing lever 58 is inverted and held at the wide-angle position by the turnover spring 59d. Then, the state shown in FIGS. 13 and 14 (C) is reached, and the finder optical system becomes a wide-angle finder optical system.

In the wide-angle state, even when the cam plate 53 is rotated for focus adjustment, the driven pin 59a moves straight through the vertically moving rod 58e of the frame 58, which is connected to the inner wall of the slot 59e of the swing lever 59 and the guide provided in the finder housing 1a. The driven pin 59a of 8-58 is clamped and fixed between the front end of the groove If and swings.
moves within the range of the second circumferential groove 54c of the cam groove 54 of the cam plate 53, and is configured so that the driven pin 59a does not come into contact with the side wall of the second circumferential groove 54c.
9a moves within the area of the second circumferential groove 54c of the cam groove 54, the swing lever 59 does not swing, and the end of the drive tooth 55c of the fan-shaped portion 55d of the switching drive member 55 moves within the area of the second circumferential groove 54c of the cam plate 53. Since it is in sliding contact with the sliding contact edge 53d, the second objective lens 57 is not displaced and is stably held.

FIG. 7 is a diagram showing the relationship between the amount of payout of the plywood lO and the switching state of the photographing optical system and the finder optical system,
The state X of the photographing optical system and the state Y of the finder optical system are made to correspond, with W representing the telephoto state and T representing the wide angle state.

As shown in the figure, in the region (a) where the extension of the base plate 10 is small, both the photographing optical system and the finder optical system are in a stable wide-angle state, and the plywood 10 is in a stable wide-angle state in the region (a).
is movable between infinity (2) and close-up ratio glN in the wide-angle state. When an operation is performed to switch the state, both optical systems are shifted to the telephoto state via region (b), and the direction changes to the telephoto state through region (C).
Then, it becomes a stable telephoto state, and it reaches infinity within area (C).
and the close-up ratio MN in the telephoto state yE.

The same applies when switching from a telephoto state to a wide-angle state.

(3) When the dustproof cover is displaced from the open position to the closed position from the telephoto state, the switch SWI is turned OFF, the input terminal 40a of the logic circuit 40 becomes Low level, and the output terminal of the exclusive OR circuit 40e becomes It will be the old GH level. The following operation is similar to (2), and even though the focal length selection member 2 is at the telephoto position, the main optical system 3 is displaced from the extended position to the retracted position, and the sub optical system 4 is moved to the fully inserted position. It is displaced from the position toward the fully retracted position. When the main optical system 3 is moved to the retracted position, it becomes possible to move the dustproof cover to the closed position. When the dustproof cover reaches the closed position, the switch SW l which is in phase with switch 5llIl
Since a is turned OFF, the power supply to the automatic focus adjustment/shunter control circuit 31 is cut off, and photographing becomes impossible.

Similarly, the finder optical system is also switched from the telephoto position to the wide-angle position.

(4) When the dustproof power /\- is moved from the wide-angle state to the closed position, the switch 5Wla, which is in phase with the switch SWI, becomes O
Since it is FF, automatic focus adjustment/shunter control circuit 3
The power supply to 1 will be cut off, making it impossible to take pictures.

(5) When the focal length selection member 5 is switched from the wide-angle state to the telephoto position, the switch SW2 is turned on, and both the input terminals 40a and 40b of the logic circuit 40 go to the Ihigh level. Since the output terminals of the exclusive OR circuit 40e and the NOR circuit 40f are both at a low level, the output terminal of the OR circuit 40g is inverted to a low level, and the output terminals 40c and 40d of the logic circuit 40 are each at a low level.

Inverted to High level. As a result, the switches 5W7a and 5W7b shown in FIG. 8 are turned off, and the switches 5W8a and 5W8b are turned on. Since the main optical system 3 is in the retracted position, the switch SW3. Snake 4, SW5 are
They are in the OFF, ON, and ON states, respectively. switch 5
W8a and 5W8b are ON, and switch SW4 is O.
N, the second path is formed and the motor 12
begins to rotate in the opposite direction from (2). Therefore, the main optical system 3 begins to be displaced from the retracted position toward the extended position.

With this initial rotation of the motor 12, the sub optical system 4 is displaced from the completely retracted position in the optical axis direction, exits the circular hole 10, and is displaced to the incompletely retracted position (shown in FIG. 8). This displacement in the optical axis direction is caused by the rotation of the cam 2Eia and the sliding contact portion 2 of the drive member 27 at the second slope section. This is done by pressing ``c''. When the sub optical system 4 comes out of the circular hole 10, the drive member 27 becomes swingable in a direction transverse to the optical axis of the main optical system 3. As the motor 12 continues to rotate, the sliding contact portion 2? c is
Since it is pushed in the direction across the optical axis by the second slope section, the drive member 27 swings in the same direction, and the end surface of the small cylinder 4C of the sub optical system 4 slides on the back surface 10 m of the base plate 10. Move from the incompletely retracted position to the incompletely inserted position. Main optical system 3
When the drive member 27 approaches the extended position, the free end 27d of the drive member 27 comes into contact with the locking member 10j and is prevented from swinging, and the sub optical system 4 stops at the incompletely inserted position. After that, motor 12
continues to rotate, the sliding portion 27c of the drive member 27 ascends the second slope section of the cam 213a and reaches the second flat section C. Subsequently, the sliding contact portion 27c is the 141st
Although it slides down the surface section B, the front end surface of the bearing part 27a contacts the collar 101 on the way, so the sliding part 27c contacts the cam 2.
It separates from fla and reaches a state where it faces or does not come into contact with the first flat section A. Due to the accompanying displacement of the drive member 27 in the optical axis direction, the small cylinder 4C of the holding cylinder 4a of the sub-optical system 4 comes into contact with the guide surface 28b of the positioning means 28, and is then guided by this to the guide surface 28a. When inserted, the end surface 4b of the holding cylinder 4a
comes into contact with the contact surface 28c of the positioning means 2, and the positioning of the sub optical system 4 is completed when the fully inserted position shown in FIG. 5 is reached.

At this time, the main optical system 3 has reached the feeding position.

Note that after the drive member 27 stops displacing in the optical axis direction due to the bearing portion 27a coming into contact with the flange 10i, the biasing force for engaging the sub optical system 4 with the positioning means 28 is generated by the spring 29.
provides.

When the main optical system 3 reaches the extended position, the switches SW3, SW4, and SW5 are in the ON, OFF, and ON states, respectively, as described in (1). When the switch SW4 is turned OFF, the second path is cut off and the motor 12
The power supply to will be stopped. Therefore, as shown in FIG. 1, the main optical system 3 is stationary at the extended position, and the sub optical system 4 is stationary at the fully inserted position, forming a composite optical system whose focal length is in the telephoto range. Further, since the switches 5W1a and 3w5 are both ON, the automatic focus adjustment/shutter control circuit 31 is in an operable state, and photography with the telephoto optical system is possible.

In response to the above switching operation, the finder optical system is switched from the wide-angle state to the telephoto state.

That is, when the main optical system 3 and the sub-optical system 4 are switched to the telephoto state, the plywood 10 moves forward a lot, so the cam plate 53 rotates a lot, contrary to the above. As a result, the driven pin 58a of the swinging lever 59 reaches the drive groove 54b from the second circumferential groove 54c of the cam groove 54, and the swinging lever 58 moves counterclockwise from the state fm shown in FIGS. 13 and 14(C). The second objective lens 57 and the rectilinear frame 5
8 Pull back towards the future.

When the second objective lens 57 and the rectilinear frame 58 move backward, the tip of the engagement rod 57c switches to the cam portion 55 of the switching drive member 55.
12 and 14B, in which the second objective lens 57 is held in an angularly inclined state about the swing axis 57a.

In synchronization with this, the driving teeth 53c mesh with the driving teeth 55c, the switching driving member 55 is rotated clockwise, and the first objective lens 56 is rotated clockwise in an arc around the swing axis 55a. , the shape 7g shown in FIG. 11 and FIG. 14(A)
become. Next, the tip of the engagement rod 57c is the cam portion 55g.
reaches the first cam surface 55e, and finally the second objective lens 5
7 faces the front, and the rectilinear frame 58 returns to the front of the second objective lens 57 to enter the telephoto state shown in FIG.

(6) When the dustproof cover is moved from the state where the dustproof cover is covered to the open position in the telephoto state, the switch SWI is turned on, and the input terminals 40a and 4 of the logic circuit 40 are turned on.
0b) are both at Ihigh level. The following operation is the same as that described in (5).

According to the above embodiment, switching of the photographing optical system and.

Switching the finder optical system and adjusting the focus can be done by sequentially using the rotation of a single motor, so multiple drives can be performed with a single drive source, making it possible to downsize the camera. It has the advantage of being possible.

FIG. 15 shows another embodiment of the present invention, in which the second objective lens 57 is moved forward instead of the first objective lens 56 in the previous embodiment, whereas the first objective lens 57 is moved forward instead of the first objective lens 56.
This allows the objective lens to escape.

That is, FIG. 15(A) shows a wide-angle state, and the first objective lens eO is a concave lens. To achieve a telephoto state, as shown in FIG. 15(B), the second objective lens 5 is
7 is tilted to retreat from the movement trajectory of the first objective lens 60, and then the first objective lens 80 is displaced in an arc, and after the first objective lens 60 escapes, as shown in FIG. 15(C). This is to return the second objective lens 57 to face the front.

"Effects of the Invention" According to the optical system switching type camera according to the present invention, when switching the finder optical system in response to switching of the photographing optical system, one of the finder optical systems is tilted and released so as not to interfere with the plurality of finder optical systems. By displacing the other, the finder optical system can be switched even in a narrow space, and the camera can be made more user-friendly without increasing its size. Furthermore, there are no design restrictions because there is no appearance distortion.

[Brief explanation of the drawing]

Figures 1 to 14 show an embodiment of the present invention, where Figure i1 is a vertical sectional view of the camera, Figure 2 is a horizontal sectional view of the camera, Figure 3 is a perspective view of the internal mechanism of the camera, and Figure 4 is a perspective view of the internal mechanism of the camera. The figure is a perspective view of the photographing optical system switching mechanism, FIG. 5 is a sectional view of the main part, FIG. 6 is a cam diagram, and FIG. Figure 8 is a diagram showing the motor control circuit for driving the optical system, Figure 9 is a logic circuit diagram that controls the operation of the motor control circuit, and Figure 10 is a plan view of the finder optical system switching mechanism in the telephoto state. 11 and 12 are the same plan views in the intermediate state, FIG. 13 is the same plan view in the wide-angle state, FIG. 14 is an explanatory diagram showing the switching state of the finder optical system, and FIG. 15 is another embodiment. It is an explanatory view showing a switching state of an example finder optical system. l...Camera body 1a...Finder storage section 3.
...Main optical system 4...Sub-optical system 10...Bed plate 12...Motor 26...Cam gear 27...Drive member 51...Rack 53...Cam plate 55...Switching Drive member 56...First objective lens 57...Second objective lens Fig. 1 Fig. 5 Fig. 6 Fig. 7 Fig. 3 Fig. 10 Fig. 12 Whistle 13] A) 0/

Claims (2)

[Claims] (1) A photographing optical system whose optical action can be switched; a $1 finder optical system which can be displaced between a position of insertion into a finder optical path and a position of withdrawal from the optical path; displacement of the first finder optical system; a second finder optical system that can be displaced from a circular trajectory position to a position outside the displacement trajectory; a first finder optical system driving means for displacing the first finder optical system between the insertion position and the retracted position in conjunction with the switching operation of the photographing optical system; An optical system switching type camera comprising @2 finder optical system driving means for displacing the second finder optical system from the circular trajectory position to a position outside the trajectory while the first finder optical system is displaced. (2) Displacing the second finder optical system between the trajectory self-position and a position outside the trajectory. i; 0 A second finder optical system driving means for positioning the second finder optical system at an insertion position of the first finder optical system when the first finder optical system is in the retracted position. The optical system switching type camera according to item 1.