JPH0651385A - Optical system switching camera - Google Patents

Abstract

(57) [Purpose] A mechanism for switching the finder optical system according to the switching of the focal length of the photographing optical system can be reasonably arranged in a narrow space. [Structure] Shooting optical systems 3 and 4 capable of switching focal lengths and capable of focus adjustment operation, and viewfinder optical system 5 capable of switching magnifications corresponding to switching of focal lengths of the shooting optical systems 3 and 4. 6 and a rotating body 53 that rotates in association with the switching of the focal lengths of the photographing optical systems 3 and 4, and based on the rotation phase of the rotating body 53, the arrangement of the optical elements forming the finder optical systems 5 and 6 is Optical system switching type camera characterized by switching.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided with a main optical system and a sub optical system. For example, wide angle photographing is performed only by the main optical system, and telephoto photographing is performed when the main optical system and the sub optical system are combined. The present invention relates to an optical system switching type camera capable of performing the above.

[0002]

2. Description of the Related Art In an optical system switching type camera, it is necessary to switch the finder optical system in accordance with the switching of the optical system in order to avoid a shooting error.

[0003]

The finder optical system is generally provided in an extremely narrow space of a part of the camera. However, if the finder optical system is automatically switched when the camera optical system is switched, interference is likely to occur when the members are moved. Therefore, there is a problem in that the means for switching the finder optical system becomes large in size, which causes an increase in the weight and size of the camera, or becomes uncool.

It is an object of the present invention to provide an optical system switching type camera which solves the above problems by making it possible to switch the finder optical system even in a narrow space.

[0005]

In order to achieve the above object, in the present invention, a photographing optical system capable of switching the optical action; a position between an insertion position in a finder optical path and a retracted position from the optical path. A first finder optical system which is displaceable; a second finder optical system which is displaceable from a position inside the displacement trajectory of the first finder optical system to a position outside the displacement trajectory; and the second finder optical system which is interlocked with the switching operation of the photographing optical system. First finder optical system driving means for displacing the first finder optical system between the insertion position and the retracted position; and the first finder optical system is displaced while the first finder optical system is displaced in association with the switching operation of the photographing optical system. The optical system switching camera comprises a second finder optical system driving means for displacing the two finder optical system from the position inside the locus to the position outside the locus.

[0006]

When the first finder optical system is displaced, the second finder optical system, which is normally within the displacement locus of the first finder optical system, is temporarily retracted to the outside of the displacement locus to minimize the first finder optical system. It moves and switches on the limit path.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, a focal length selecting member 2 is provided on the rear surface of the camera body 1, and a switch SW1 interlocked with a dust cover (not shown) is provided inside the camera body 1. A switch SW2 interlocking with the focal length selection member 2 is provided.

On the front side of the camera body 1, a main optical system 3 is provided so as to be displaceable in the optical axis direction (left and right direction in the figure), that is, retractable and retractable. Camera body
Inside 1 is a direction in which the sub optical system 4 crosses the optical axis of the main optical system 3 between the position inserted into the light beam of the main optical system 3, that is, the photographing light beam and the position retracted from the light beam (see FIG. 1). It is provided so that it can be displaced in the vertical direction.

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

The switch SW1 is set to be turned off when the dustproof cover covers the main optical system 3 and turned on when the front surface of the main optical system 3 is opened. The switch SW2 is set to be ON when the focal length selection member 2 is in the telephoto position and OFF when it is in the wide-angle position.

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

The figure shows a state in which the main optical system 3 is in the extended position. An opening 10a through which a photographing light beam passes is provided in the center of the base plate 10, and an aperture / shutter device 11 and a main optical system 3 shown by a chain line are fixedly provided in front of the opening 10a. A motor 12 is fixedly installed on the upper back surface of the base plate 10. Both ends of the rotary shaft penetrate through both end faces of the casing of the motor 12 and project therefrom. A bevel gear 12a (illustrated in FIG. 4) is fixedly installed at one end of the rotary shaft. A bevel gear 13 axially supported by the base plate 10 is engaged with the bevel gear 12a, and a spur gear portion of the gear 13 is engaged with a gear 14 also axially supported by the base plate. A through hole is opened in the center of the gear 14, and the gear 14
A female screw whose axis is the center of rotation is cut.

A male screw cut on the guide shaft 15 is screwed into the female screw. The guide shaft 15 extends in the optical axis direction, has a distal end fixed to the substrate 1c of the camera body 1, and a distal end 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. A bevel gear 16 discontinued by the base plate 10 meshes with the bevel gear 12b, and an input gear 17a of a gear train 17 discontinued by the base plate 10 meshes with a spur tooth portion of the gear 16.

A through hole is formed in the center of the output gear 17b of the gear train 17, and a female screw whose center is the rotation center of the gear 17b is formed in the through hole. This female screw has
A male screw cut on the guide shaft 18 is screwed. Guide shaft 18
Extends in the optical axis direction, and the end is the substrate 1c of the camera body.
Is fixed to the through hole 10c of the base plate 10 and is slidable in the axial direction.

Gears 14 and 17b for constant rotation of the motor
The amount and direction of rotation of are set to be equal,
Further, the screwing condition of the gear 14 and the guide shaft 15 and the screwing condition of the gear 17b and the guide shaft 18 are set to be equal. A guide shaft 19 extending in the optical axis direction is also planted in the substrate 1c. The guide shaft 19 includes a through hole 10e of the protruding portion 10d protruding from the back surface of the base plate 10 and the base plate.
It is inserted into 10 through holes 10f so as to be slidable in the axial direction.

With such a structure, when the motor 12 rotates, the gear 14 and the guide shaft 15 are screwed together, and the gear 17b and the guide shaft 18 are screwed together.
The base plate 10 is parallel-moved in the optical axis direction while being kept perpendicular to the optical axis by the screwing of the main optical system 3 fixed to the optical axis direction.
The diaphragm / shutter device 11 is displaced in the optical axis direction between the feeding position and the feeding position.

A printed circuit board 20 is fixed to the right side surface of the base plate 10. Conductor lands 20a to 20c are provided on the surface of the printed circuit board 20, and three sliding contact pieces 21 to 23 fixed to the camera body are slidable on them. The sliding contact piece 21 and the conductor land 20a make the switch SW3, and the sliding contact piece 22 and the conductor land 20b make the switch SW3.
4, the switch SW5 is composed of the sliding contact piece 23 and the conductor land 20c. The switch SW3 is OFF when the main optical system 3 is in the feeding position, the switch SW4 is in the feeding position, and the switch SW5 is OFF when it is between the feeding position and the feeding position.

The 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 retracted position. Switch SW5 is
A switch for disabling shutter release 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 cutting off the power supply to (shown in FIG. 8).

The film 24 is arranged behind the photographing opening 1d formed in the substrate 1c.

FIG. 4 is a perspective view of the auxiliary optical system loading / unloading mechanism arranged 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 the base plate 10, and the drive member 27 holds the sub optical system 4. Reduction gear train
The input gear 25a of 25 is meshed with the spur gear of the bevel gear 13, and the final gear 25b of the reduction gear train 25 is a cam gear.
It meshes with 26. The cam gear 26 and the drive member 27 are coaxial with each other, and they are coupled to each other via a front cam 26a provided on an 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 at the extended position, it is placed at the insertion position (shown by the solid line) in which the sub optical system 4 is inserted in the photographing light beam, and when the main optical system 3 is at the extended position, the sub optical system 3 is placed. 4 is placed at a retracted position (illustrated by a chain double-dashed line) retracted from the photographing light flux.

FIG. 5 is a sectional view of the auxiliary optical system mounting / demounting mechanism.

In each drawing, the base plate 10 in front of the opening 10a is shown.
The main optical system 3 and the diaphragm / shutter device 11 are fixed to the
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 tube 4a for integrally holding the sub optical system 4 can be engaged with the positioning means 28, and the optical axis of the sub optical system 4 is in the extended position at the time of engagement. It is aligned with the axis, 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 tube 4c protruding from the front end surface 4b of the holding tube 4a into the inner tube surface 28a of the positioning means 28, and positioning in the optical axis direction is performed by the end surface 4b of the holding tube 4a. It is formed by contacting the contact surface 28c of the positioning means 28.

The drive member 27 is a fixed shaft embedded in the base plate 10.
It is axially slidably supported by 10g via a bearing portion 27a. The driving member 27 is formed with a circumferential groove 27b for accommodating the sub optical system 4 in a loosely fitted state. Holding tube for sub optical system 4
A collar 4d is provided on the entire outer circumference of 4a, 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 with 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 the drive member 27 can slidably contact a front cam 26a formed on this end face. Collars 10h and 10i are fixed to the shaft 10g so as to sandwich the bearing 27a.
A spring 30 is inserted between the collar 10h and the drive member 27. The spring 30 serves to press the sliding contact portion 27c of the drive member 27 against the cam 26a or press the front end surface of the bearing portion 27a against the collar 10i.

Locking members 10j and 10k for locking the free end 27d of the drive member 27 are planted on the base plate 10.
Is a drive member 27 when the sub optical system 4 is brought to the insertion position.
The lock member 10k locks the swing of the drive member 27 when the sub optical system 4 is brought to the retracted position. Also near the end of the locking member 10k is a circular hole 10 _l of the small tube 4c falls in loosely sub optical system 4 brought to the retracted position is provided.

FIG. 5 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 positioning means 28 is engaged. The sub optical system 4 also takes the following positions. That is, although it is in the insertion position, the front cam 26
Incomplete insertion position where it is pushed up by a and does not engage with the positioning means 28, is located on the circular hole 10 _l , but its small cylinder 4c is pushed up by the front cam 26a and is not dropped into the circular hole 10 _l. The retracted position is the fully retracted position where the small cylinder 4c has fallen into the circular hole 10 _l .

FIG. 6 shows a cam diagram of the cam 26a. The cam 26a includes a first flat section A in which the rotation angle Θ is 0 to Θ1 and the head is unchanged at 0, a first slope section B in which the head h is linearly increased from 0 to h1 from Θ1 to Θ2, and Θ2 is It consists of a second flat section C in which the head h does not change at h1 over Θ3, and a second slope section D in which the head h decreases linearly from h1 to 0 over 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.

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

As shown in FIG.
51 is erected, and the rack 51 is guided by a guide shaft 51a whose base end is planted in the base plate 1c and whose front portion is loosely fitted to the base plate 10.

The rack teeth 51b engraved on the rack 51 are
The pinion 52a fixed to the lower end of the transmission member 52 is meshed with the spur gear 52b at the upper end of the transmission member 52 and the cam plate 53.
Is meshed with the reduction gear 53a fixed to the.

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

A switching drive member 55 is provided close to the cam plate 53.
Is pivotally supported by the finder storage section 1a via a swing shaft 55a. The switching drive member 55 includes a start tooth 55b and a drive tooth 55c corresponding to the start tooth 53b and the drive tooth 53c of the cam plate 53.
55d having a fan shape, a first radial cam surface 55e formed around the swing shaft 55a, and a second circular cam surface 55e.
The cam portion 55g includes a cam surface 55f, and a swing arm 55h radially extended from a swing shaft 55a.

The first objective lens 56 is attached to the tip of the supporting arm 55i extended upward from the tip of the swing arm 55h.
Is fixed, and the first objective lens 56 constitutes a first finder optical system. The switching drive member 55 is a finder storage
A spring 55j stretched between the pin 1a and the pin protruding from the pin 1a urges it clockwise as viewed from above in FIG.

The second objective lens 57, which constitutes the second finder optical system, is swingably supported by the rectilinear frame 58 via the swing shaft 57a, and the rectilinear frame 58 is located in the finder optical path in the finder housing 1a. It is supported so as to be able to move straight in the optical axis direction. Second
A spring is provided between the locking pin 57b protruding downward from the objective lens 57 and the locking pin 58a protruding downward from the rectilinear frame 58.
58b is stretched, the second objective lens 57 is urged clockwise as viewed from above in FIG. 3, and the locking pin 57b is attached to the lower side 58 of the rectilinear frame 58.
It is held facing the front by abutting on c.

Further, an engaging rod 57c projectingly provided on the lower end surface of the second objective lens 57 extends downward, and its tip end engages with the cam portion 55g of the switching drive member 55. The rack 51,
The transmission member 52, the cam plate 53, the switching drive member 55, the engaging rod 57c, etc. constitute the second finder optical system switching means.

A driven pin 59a protruding from the swing lever 59 is engaged with the cam groove 54 of the cam plate 53. The oscillating lever 59 has a base end portion through a pivot 59b and a viewfinder storage portion 1a.
Pin 59 that is pivotally supported by
A turnover spring 59d for holding the swing lever 59 in the telephoto position and the wide-angle position is stretched between c and the pin 1b fixedly mounted in the finder housing 1a. The cam groove 54 of the cam plate 53 is a first circumferential groove 54a that does not move the driven pin 59a.
And a drive groove 54b for moving the driven pin 59a to rock the rocking lever 59, and a second circumferential groove 54c for not driving the driven pin 59a.

A substantially U-shaped split groove 59e is formed at the tip of the swing lever 59, and the split groove 59e is extended downward from a linear motion connecting arm 58d projecting rearward from the rectilinear frame 58. The tip of the vertical movement rod 58e is engaged.

FIG. 8 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 electrode switch SW of the power source E.
3-Switch SW7a-Motor 12-Switch SW7b-Power supply E negative path. When power is supplied 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 electrode switch SW of the power source E.
4-Switch SW8a-Motor 12-Switch SW8b-Negative path of power supply E. By supplying power through this path, the motor 12 rotates in the direction opposite to that in the case of the first path,
The main optical system 3 is displaced to the feeding position and the sub optical system 4 is displaced to the insertion position.

Here, the switches SW7a, SW7b, SW8a and SW8b are
It is a semiconductor switch whose opening and closing is controlled by a logic circuit 40 (shown in FIG. 9) 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 reverse direction to move the optical system in the optical axis direction. Move it back and forth to bring it into focus.

Switches SW1a and SW5 connected in series are inserted in the power supply path of the control circuit 31. Switch SW
1a is a semiconductor switch controlled by the switch SW1 and opened / closed in the same phase as the switch SW1. The switch 1a is turned on only when a dust cover (not shown) is in the open position. Switch SW5
ON only when the main optical system 3 is in the extended position and the retracted position (when the secondary optical system 4 is in the fully inserted position and the fully retracted position)
Becomes These prevent the automatic focus adjustment and the shutter from operating when the dust-proof cover and the optical systems 3 and 4 are in positions unsuitable for shooting.

FIG. 9 shows a logic circuit 40 which controls the operation of the motor control circuit of FIG. This logic circuit 40
Is a pair of input terminals 40a, 40b and a pair of output terminals 40c, 40
It has d and. The input terminal 40a is between the switch SW1 and the ground resistance, the input terminal 40b is between the switch SW2 and the ground resistance, and the output terminal 40c is the switch SW7a, SW7b.
And the output terminal 40d is connected to the control terminals of the switches SW8a and 8b. The input terminal 40a is
When the switch SW1 is ON, that is, when the dust cover is in the open position, the level is High, and when the switch SW1 is OFF,
That is, when the dustproof cover 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 2 is in the telephoto position, and becomes Low level when the switch SW2 is OFF, that is, when the focal length selection member 2 is in the wide-angle position. Become. When the output terminal 40c is at high level, both switches SW7a and SW7b are turned on, and when at low level, both are turned off. Output terminal
40d has both switches SW8a and SW8b when High level
Turn it on, and turn it off at the low level.

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
It is connected to the other input terminal of the exclusive OR circuit 40e and the other input terminal of the NOR circuit 40f. Both circuits
The output terminals of 40e and 40f are connected to both input terminals of the OR circuit 40g. 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 logic circuit 40g.
Is connected to the output terminal 40d of.

In the table below, the position of the dustproof cover, the position of the focal length selecting member 2, the states of the switches SW1 and SW2 which are switched depending on these positions, the input terminals 40a and 40b of the logic circuit 40,
Output terminal 40c, 40d level, switch SW7a, SW7b, SW8a, S
The relationship between the state of W8b and the positions of the main optical system 3 and the sub optical system 4 is summarized.

[0052]

[Table 1]

(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, the switches SW1 and SW2 are switched.
Since both are in the ON state, the input terminal 40a of the logic circuit 40,
Both 40b are high level. The output terminals of the exclusive OR circuit 40e and the NOR circuit 40f become Low level, and the output terminal of the OR circuit 40g also becomes Low level. Logic circuit 40
The output terminals 40c and 40d of are at low level and high level, respectively.
As a result, the switches SW7a and SW7b shown in FIG. 8 are turned off and the switches SW8a and SW8b are turned on. Since the main optical system 3 is in the extended position, as shown in FIG. 3, the switches SW3, SW4,
SW5 is in the ON, OFF, and ON states, respectively. Switch SW
Since 7a 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 stationary at the extended position, and the sub optical system 4 is stationary at the fully inserted position where the positioning means 28 is completely engaged as shown in FIG. A synthetic optical system is constructed, and its focal length 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. FIG. 1 shows the state at this time.

In accordance with the photographing start operation, the motor 12 is supplied with electric power through the third path to rotate, and displaces the optical systems 3 and 4 in the optical axis direction from the close-up of the telephoto area to infinity to perform focus adjustment. Let During rotation of the motor 12 for focus adjustment in this telephoto region, the front end face of the bearing portion 27a of the drive member 27 is moved by the spring 30
Since it is in contact with the collar 10i by the urging force of
The sliding contact portion 27c of the cam 26a only faces the first flat section A of the cam 26a and does not make contact therewith. Therefore, the sliding contact portion 27c is
Will not become a load of.

The finder optical system is also in the telephoto state as shown in FIGS. 10 and 14 (A) with the first objective lens 56 positioned in front of the second objective lens 57.

When the base plate 10 of both the main optical system 3 and the sub optical system 4 is displaced back and forth to adjust the focus for telephoto shooting, and the cam plate 53 is thereby rotated, the vertical movement rod 58e of the rectilinear frame 58 swings. It is clamped and fixed between one inner wall of the split groove 59e of the moving lever 59 and the rear end of the guide groove 1f provided in the finder housing 1a, and the starting teeth 53b of the cam plate 53 and the switching drive member.
The vertical movement pin 59 of the swing lever 59 is separated from the starting tooth 55b of 55.
a moves within the range of the first circumferential groove 54a of the cam groove 54 of the cam plate 53, and the vertical movement pin 59 is provided on the side wall of the first circumferential groove 54a.
Since a is not touching, the viewfinder optical system does not operate and do not switch or vibrate.

(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.
Then, the input terminal 40b of the logic circuit 40 becomes low level. The output terminal of the exclusive OR circuit 40e is Hi
Since it becomes the gh 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, SW7b shown in FIG. 8 are turned on, and the switches SW8a, SW8b,
Turns off. Since the main optical system 3 is at the feeding position,
As shown in the figure, switches SW3, SW4, and SW5 are ON,
Since the switches SW7a and SW7b are in the ON and OFF states 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. 5) in which the positioning means 28 is engaged by the initial rotation of the motor 12, and is not engaged in this position. Move to the insertion position. This displacement in the optical axis direction is caused by the cam 26a.
Is rotated clockwise from the state shown in FIG. 3 to push 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 incompletely inserted position and is disengaged from the positioning means 28, the drive member 27 can swing in the direction traversing the optical axis. 27c is pushed to the first slope section B and the main optical system 3
Rocks clockwise in a plane that crosses the optical axis of.

At this time, the end surface of the small cylinder 4c of the sub optical system 4 swings in the same direction while sliding on the back surface 10m of the base plate 10 perpendicular to the optical axis of the main optical system 3. When the main optical system 3 approaches the retracted position, the free end 27d of the drive member 27 abuts the locking member 10k and its swing is prevented, and the sub optical system 4 does not insert into the circular hole 10 _l. Reach the position. After that, the motor 12
Continues to rotate, the sliding contact portion 27c of the drive member 27 moves up the first slope section B of the cam 26a and reaches the second flat section C. Subsequently, the sliding contact portion 27c slides down the second slope section D, but the front end surface of the receiving shaft portion 27a abuts on the collar 10i in the middle thereof, so the sliding contact portion 27c moves away from the cam 26a and moves to the first
Although it faces the flat section A, it reaches a state where it does not contact. Due to the displacement of the drive member 27 in the optical axis direction accompanying this, the sub optical system 4
Small tube 4c of is inserted into a circular hole 10 _l of the base plate 10, the end face 4b of the holding tube 4a reaches the fully retracted position in contact with the edge of the circular hole 10 _l.
At this time, the main optical system 3 has reached the retracted position.

[0061] Note that after the drive member 27 stops displacement of the optical axis direction by the front end face of the bearing portion 27a abuts against the flange 10i, biasing force for inserting the secondary optical system 4 in the circular hole 10 _l, the spring 29 supplies.

When the main optical system 3 reaches the retracted position, the fourth
The switches SW3, SW4, and SW5 shown in the figure are in OFF and ON states, 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, since the main optical system 3 is stationary at the retracted position and the sub optical system 4 is stationary at the completely retracted position, the optical system is composed of only the main optical system 3 and its focal length is in a wide-angle region. Also, since the switches SW1 and SW5 are both ON, the automatic focus adjustment / shutter control circuit 31 is in an operable state,
It is possible to shoot with a wide-angle optical system.

In accordance with the photographing start operation, the motor 12 is supplied with electric power through the third path to rotate, and displaces the main optical system 3 in the optical axis direction from the close-up of the wide-angle range to infinity to perform focus adjustment. . During the rotation of the motor 12 for focus adjustment in this wide-angle range, the sliding contact portion 27c of the drive member 27 keeps the first flat section A
Since the drive member 27 does not move because it only faces and does not contact, the sub optical system 4 remains in the completely retracted position.

The finder optical system is switched by the finder optical system switching mechanism in the following manner in response to the change of the above state. That is, the first finder optical system 5 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 cam plate 53 is largely enlarged by the path of the rack teeth 51b, the pinion 52a, the spur gear 52b, and the starting teeth 53b. It is rotated. As a result, the starting tooth 53b is the starting tooth of the fan-shaped portion 55d of the switching drive member 55.
55b is pressed, and the drive teeth 53c and 55c mesh with each other.Because one tooth is missing between the start tooth 53b and the drive tooth 53c and between the start tooth 55b and the drive tooth 55c, there is no interference. Start meshing smoothly without doing

Then, as shown in FIG. 11, since the switching drive member 55 is rotated, the engagement rod 57 is attached to the first cam surface 55e.
The tip of c is pushed, the second objective lens 57 rotates about the swing shaft 57a counterclockwise by a set angle when viewed from above in FIG. 3, and the tip of the engaging rod 57c moves to the second position. When reaching the cam surface 55f, the second objective lens 57 is held at a constant angle. The first objective lens is synchronized with the angular displacement of the second objective lens 57.
56 draws an arc around the cam portion 55g together with the switching drive member 55, and moves by grabbing the end of the second objective lens 57 when facing the front to the state shown in FIG. 12 and FIG. 14 (B). Become.

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 59 rotates clockwise around the pivot 59b as viewed from above in FIG. 3, whereby the split grooves 59e,
The rectilinear frame 58 is pushed forward through the driven rod 58e and the linear motion connecting arm 58d. When the rectilinear frame 58 is pushed forward, the tip end of the engaging rod 57c comes off the second cam surface 55f of the switching drive member 55, so that the second objective lens 57 faces the front as before and interferes with the cam portion 55g. Without moving, the rectilinear frame 58 and the second objective lens 57 are replaced with the first objective lens 56 and the original first
The swing lever 59 is pushed out to the position of the objective lens 56, and the swing lever 59 is inverted and held at the wide-angle position by the turnover spring 59d.
The state shown in FIG. 14 and FIG. 14C is obtained, and the wide-angle viewfinder optical system is obtained.

In the wide-angle state, even if the cam plate 53 is rotated for focus adjustment, the vertical movement pin 59a moves the vertical movement rod 58e of the rectilinear frame 58 into the inner wall of the split groove 59e of the swing lever 59 and the viewfinder storage portion 1a. The driven pin 59a of the rocking lever 59 moves within the range of the second circumferential groove 54c of the cam groove 54 of the cam plate 53, and is fixed by being held between the front end of the provided guide groove 1f and The driven pin 59a is prevented from coming into contact with the side wall of the second circumferential groove 54c, and the vertical movement pin 59a moves within the area of the second circumferential groove 54c of the cam groove 54, so that the swing lever 59 swings. Since the ends of the drive teeth 55c of the fan-shaped portion 55d of the switching drive member 55 are in sliding contact with the sliding contact edge 53d of the cam plate 53, the second objective lens 57 is not displaced and is stable. Is held.

FIG. 7 is a diagram showing the relationship between the amount of extension of the base plate 10 and the switching states 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 shown in FIG. Correspondingly, the telephoto state is represented by W and the wide-angle state is represented by T.

As shown in the figure, in the area (a) where the extension amount 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 base plate 10 is in the area (a).
10 is movable between infinity ∞ and the close range N in the wide angle state. When the operation for switching the state is performed, both optical systems are displaced toward the telephoto state via the area (b), and a stable telephoto state is set in the area (c), and infinity ∞ and telephoto are set in the area (c). It is possible to move to and from the closest distance N in the state. The same applies when switching from the telephoto state to the wide-angle state.

(3) When the dustproof cover is displaced from the open position to the closed position from the telephoto state, the switch SW1 is turned off and the input terminal 40a of the logic circuit 40 becomes low level,
The output terminal of the exclusive OR circuit 40e becomes High level. The following operation is the same as that of (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. Main optical system 3
When is moved to the retracted position, the dust cover can be moved to the closed position. When the dustproof cover reaches the closed position, the switch SW1a in the same phase as the switch SW1 is turned off, so that the power supply to the automatic focus adjustment / shutter control circuit 31 is cut off and the photographing cannot be performed.

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

(4) When the dustproof cover is displaced from the wide-angle state to the closed position, the switch SW1a in phase with the switch SW1 is
Since it is turned off, the automatic focus adjustment / shutter control circuit 31
The power supply to the power supply was cut off and it became impossible to shoot.

(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 the input terminals 40a and 40b of the logic circuit 40 are both at the high level. The output terminals of the exclusive OR circuit 40e and NOR circuit 40f both become Low level, so the output terminal of the OR circuit 40g is inverted to Low level and the output terminal 40 of the logic circuit 40
c and 40d are inverted to Low and High levels, respectively. As a result, the switches SW7a and SW7b shown in FIG. 8 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 turned off, on and on respectively.
In N state. Since the switches SW8a and SW8b are ON and the switch SW4 is ON, the second path is formed,
The motor 12 starts to rotate in the direction opposite to that in (2). Therefore, the main optical system 3 starts to be displaced from the feeding position toward the feeding position.

By the initial rotation of this motor 12, the sub optical system 4
Moves from the completely retracted position in the optical axis direction, comes out of the circular hole 10 _l, and is displaced to the incomplete retracted position (shown in FIG. 8). The displacement in the optical axis direction is caused by the rotation of the cam 26a and the pushing up of the sliding contact portion 27c of the drive member 27 in the second slope section D. Drive member when the secondary optical system 4 comes out of the circular hole 10 _l
27 is swingable in a 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 drive member 27 swings in the same direction and the small cylinder 4c of the sub optical system 4 moves. The end surface moves from the incomplete retracted position to the incompletely inserted position while sliding on the back surface 10m of the base plate 10. When the main optical system 3 approaches the extended position, the free end 27d of the drive member 27 contacts the locking member 10j and its swing is prevented, and the sub optical system 4 stops at the incompletely inserted position. After that, the motor 12 continues to rotate,
The sliding contact portion 27c of the driving member 27 is provided on the second slope section D of the cam 26a.
To reach the second flat section C.

Subsequently, the sliding contact portion 27c slides down the first slope section B, and the front end face of the bearing portion 27a is in the middle of the sliding contact portion 27c.
Since the sliding contact portion 27c is separated from the cam 26a,
The flat section A is brought into contact with the flat section A but is not in contact therewith. Due to this 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 guided by the guide surface 28a. When inserted, the end surface 4b of the holding cylinder 4a contacts the contact surface 28c of the positioning means 28, reaches the complete insertion position shown in FIG. 5, and the positioning of the auxiliary optical system 4 is completed. At this time, the main optical system 3 has reached the delivery position.

The biasing force for engaging the sub optical system 4 with the positioning means 28 is the spring 29 after the driving member 27 stops its displacement in the optical axis direction due to the contact of the bearing portion 27a with the collar 10i.
Supplied by.

When the main optical system 3 reaches the feeding position,
As described in (1), the switches SW3, SW4, and SW5 are in the ON, OFF, and ON states, respectively. When the switch SW4 is turned off, the second path is cut off and the power supply to the motor 12 is 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 to form a composite optical system, and its focal length is in the telephoto range. Further, since the switches SW1a and Sw5 are both ON, the automatic focus adjustment / shutter control circuit 31 is in an operable state, and it is possible to shoot with the telephoto optical system.

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 moves largely forward, so that the cam plate 53 rotates largely, contrary to the above. As a result, the vertical movement pin 59a of the rocking lever 59 is engaged with the cam groove 54
From the second circumferential groove 54c to the drive groove 54b, the swing lever 59 rotates counterclockwise from the state shown in FIGS. 13 and 14C, and the second objective lens 57 and the rectilinear frame 58. Pull back to the back.

When the second objective lens 57 and the rectilinear frame 58 retreat, the tip of the engaging rod 57c is moved to the cam portion of the switching drive member 55.
The first objective lens 57 is brought into contact with the second cam surface 55f of 55g, and the second objective lens 57 is held in a state of being tilted angularly about the swing shaft 57a.
The state shown in FIG. 2 and FIG. 14 (B) is obtained.

In synchronization with this, the driving tooth 53c is driven by the driving tooth 55c.
, The switching drive member 55 is rotated in the clockwise direction, the first objective lens 56 is rotated in the clockwise direction in an arc around the swing shaft 55a, and as shown in FIGS. 11 and 14 (A). It becomes the state shown. Next, the tip of the engaging rod 57c is the first part of the cam 55g.
Upon reaching the cam surface 55e, the second objective lens 57 finally faces the front, and the rectilinear frame 58 returns to the front front of the second objective lens 57 and enters the telephoto state shown in FIG.

(6) When the dust cover is displaced toward the open position from the state in which the dust cover is covered in the telephoto state, the switch SW1 is turned on, and the input terminal 40a of the logic circuit 40,
Both 40b are high level. The following is the same operation as described in (5).

According to the above embodiment, the switching of the photographing optical system, the switching of the finder optical system, and the focus adjustment can be performed by sequentially utilizing the rotation of one motor, so that a single drive source is used. There is an advantage that the camera can be miniaturized because a plurality of driving can be performed.

FIG. 15 shows another embodiment of the present invention. In the embodiment, the second objective lens 57 is moved forward instead of the first objective lens 56.
The first objective lens simply escapes.

That is, FIG. 15 (A) shows a wide-angle state, and the first objective lens 60 is a concave lens. To set the telephoto state, as shown in FIG. 15 (B), the second objective lens 57 is tilted so as to be retracted from the movement trajectory of the first objective lens 60, and then the first objective lens 60 is displaced in an arc. Then, after the first objective lens 60 escapes, the second objective lens 57 is returned so as to face the front as shown in FIG. 15 (C).

[0087]

According to the optical system switching type camera of the present invention, when the finder optical system is switched in response to the switching of the photographing optical system, one of the plurality of finder optical systems is tilted so that the finder optical system does not interfere with each other and escapes. Since the other is displaced, the finder optical system can be switched even in a narrow space, and the camera can be made convenient without increasing the size of the camera. Moreover, there is no restriction on the design because it does not appear on the appearance.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a camera showing an embodiment of the present invention.

FIG. 2 is a horizontal sectional view of a camera showing an embodiment of the present invention.

FIG. 3 is a perspective view of an internal mechanism of a camera showing an embodiment of the present invention.

FIG. 4 is a perspective view of a photographing optical system switching mechanism of the camera according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view of a main part of a photographing optical system switching mechanism of a camera according to an embodiment of the present invention.

FIG. 6 is a cam diagram of the photographing optical system switching mechanism of the camera according to the embodiment of the present invention.

FIG. 7 is a diagram showing the relationship between the extension amount of the base plate of the camera and the switching states of the photographing optical system and the finder optical system.

FIG. 8 is a circuit diagram of a motor control circuit for driving an optical system.

FIG. 9 is a logic circuit diagram for controlling the operation of a motor control circuit.

FIG. 10 is a plan view of a finder optical system switching mechanism in a telephoto state.

FIG. 11 is a plan view of the finder optical system switching mechanism in an intermediate state.

FIG. 12 is a plan view of the finder optical system switching mechanism in an intermediate state.

FIG. 13 is a plan view of the finder optical system switching mechanism in a wide-angle state.

FIG. 14 is an explanatory diagram showing a switching state of a finder optical system.

FIG. 15 is an explanatory diagram showing a switching state of a finder optical system according to another embodiment.

[Explanation of symbols]

1… Camera body 1a… Viewfinder storage 3
Main optical system 4 Sub optical system 10 Base 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

[Procedure amendment]

[Submission date] December 27, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided with a main optical system and a sub optical system. For example, wide-angle photographing is possible only with the main optical system, and telephoto photographing is possible when the main optical system and the sub optical system are combined. The present invention relates to an optical system switching camera that includes a photographic optical system that can switch the focal length and a finder optical system that can switch the magnification corresponding to the switching of the focal length of the photographic optical system.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art In an optical system switching type camera having a photographing optical system capable of switching optical functions and also capable of adjusting and adjusting optical functions for focus adjustment even in the switched state, a focal length of the photographing optical system is changed. It is necessary to switch the finder optical system in accordance therewith, and as such a conventional optical system switching type camera, there is one disclosed in Japanese Utility Model Laid-Open No. Sho 58-96523. That is, the publication discloses a so-called 110 type camera in which the body has a thickness and at the same time a plurality of finder lenses are inserted into or removed from the optical path.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

[0003]

However, since such a conventional technique is intended for a 110-inch camera, it has a sufficient space so that related members can be easily arranged. Since the body becomes thin, the conventional technology cannot be applied as it is,
It is necessary to be able to change the arrangement of the optical elements that make up the finder optical system even in a small space.
The technology that enables this has not yet existed.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

An object of the present invention is to provide an optical system switching type camera in which a mechanism for switching the finder optical system according to the switching of the focal length of the photographing optical system can be reasonably arranged in a narrow space. To provide.

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

[0005]

In order to achieve the above object, in the present invention, a photographing optical system capable of switching focal lengths and capable of focus adjustment operation; switching of focal lengths of the photographing optical system A finder optical system capable of correspondingly switching the magnification; and a rotator that rotates in association with switching of the focal length of the photographing optical system, and the finder optical system is configured based on the rotation phase of the rotator. The optical system switching camera is characterized in that the array of optical elements is switched.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

According to the present invention, when the focal length of the photographing optical system is switched, the magnification of the finder optical system is switched correspondingly. The switching is performed by rotating the rotating body in conjunction with the switching of the focal length of the photographing optical system, and switching the arrangement of the optical elements forming the finder optical system based on the rotation phase of the rotating body.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction content]

As described above, the cam plate 53 is a rotating body which rotates in association with the switching of the focal length of the photographing optical system. The cam groove 54 is formed on the upper surface of the cam plate 53, and the activation teeth 53b are formed on the periphery thereof.
And a continuous drive tooth by notching one tooth from the starting tooth 53b.
53c and a sliding contact edge 53d are formed.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0087

[Correction method] Change

[Correction content]

[0087]

According to the optical system switching type camera of the present invention, a rotator which rotates in association with the switching of the focal length of the photographing optical system is provided, and the finder optical system is constructed based on the rotation phase of this rotator. Since the arrangement of the optical elements to be switched is switched, the finder optical system switching mechanism can be configured by arranging the rotating body, which requires a minimum space and can be easily used for small cameras such as 35 mm format cameras. Can be installed. Further, since the switching is performed by the rotating body, the operation is smooth, efficient, and reliable.

Claims (1)

[Claims] 1. A photographic optical system capable of switching an optical action; a first finder optical system displaceable between a position inserted into a finder optical path and a retracted position from the optical path; the first finder optical system. Second finder optical system displaceable from a position inside the displacement trajectory to a position outside the displacement trajectory; 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. First finder optical system driving means for moving the second finder optical system from the in-trajectory position to the out-trajectory position while the first finder optical system is displaced in association with the switching operation of the photographing optical system. An optical system switching type camera comprising a second finder optical system driving means.