JPH01197728A - Camera - Google Patents

Abstract

PURPOSE:To accomplish a simple structure without using a cam mirror barrel by interlocking a view angle modifying means with the first group lens of a photographing optical system at the time of release and automatically focusing the photographing optical system. CONSTITUTION:A finder optical system 28 is constituted of a moving lens mirror barrel 28a, a moving lens 28b carried by the mirror barrel 28a, and a fixed lens group. The mirror barrel 28a is screwed into the screw part provided on the driving axis 27 of the optical system 28 and forms a moving means which moves along the screw part and in parallel with an optical axis. The mirror barrel 28 and the driving part 27 form the view angle modifying means of the optical system 28. On the other hand, the photographing system carries the first group lens or a second group lens by a mirror barrel 3 or 8, and forms a moving means which is screwed into a screw axis 4 or 9. The view angle modifying means and the moving means of the lens groups 1 and 2 operate independently. At the time of release, a gear 6 is meshed with a gear 16, and the first group lens and the view angle modifying means move together. Then the photographing optical system is automatically focused. Since the cam mirror barrel is not used, the structure is simplified and the camera is miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a camera having a photographing optical system capable of changing photographing magnification and a finder optical system independent of the photographing optical system.

[Prior Art] Recently, non-interchangeable lens cameras have been commercially available which are equipped with a photographic optical system consisting of a two-group zoom lens and a finder optical system independent of the photographic optical system. In this known camera, the photographing optical system is configured as a two-group zoom lens consisting of a compensator lens group and a variator lens group.
The variator lens group and compensator lens group of the photographing optical system are moved by a cam barrel in conjunction with the zooming operation of the finder optical system, and when the camera is released, only the compensator lens group is moved to perform automatic focusing. It is configured as follows. The zoom operation and automatic focusing operation are each performed by separate motors.

[Problem to be solved by the invention] The known camera has the following problems.

(1) Manufacturing costs are high because separate motors are used for zooming and autofocusing.

(ii) Since the zoom mechanism (variable magnification mechanism) and automatic focusing mechanism are configured as separate devices, the structure is complex, the weight is large, and the manufacturing cost is high.

(iii) Since the lens barrel is left largely protruding from the camera body after shooting, if an impact is applied to the lens barrel in this state, the automatic focusing mechanism and variable magnification mechanism built into the lens barrel may be damaged. There was a great risk of damage. Also,
With the lens barrel protruding largely from the camera body, the camera cannot be stored in the camera case, making it impossible to protect the camera, and the large portion protruding from the camera body makes it inconvenient to carry.

(1v) A known cam lens barrel is used to simultaneously move the variator lens group and the compensator lens group, but this cam lens barrel requires high precision machining, so high manufacturing costs can be avoided. I couldn't.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a new camera which is simpler in structure and lighter in weight than the above-mentioned known cameras, and which can be manufactured at a lower cost.

[Means for Solving the Problems] The camera of the present invention eliminates the use of a known cam lens barrel, and is based on the basic idea that the compensator lens group is not focused during zooming, but is focused only during automatic focusing. As a result, the present invention provides a camera having the following features that solves the problems inherent in the known cameras.

[Function] Since the camera of the present invention is configured such that the compensator lens group is moved only during automatic focusing operation, zoom driving and automatic focusing driving can be performed by a single motor. Since it has a structure that does not use a camera, it has a simpler structure than the above-mentioned known camera, and also has the feature that it can be manufactured at a low cost.

In addition, the camera of the present invention is configured so that the lens barrel is automatically stored in the camera body immediately after shooting, so there is no risk of damage to the lens barrel, and the camera can be stored in the camera case immediately after shooting. It has the characteristics of being able to completely protect the camera and being easy to carry.

Furthermore, the camera of the present invention has a structure that does not move the compensator lens group during zooming, and has a configuration in which the zoom drive and automatic focusing drive are performed by a motor, so that the camera consumes less power than the known camera. It also has the feature of reducing power consumption and reducing running costs.

[Example] The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic longitudinal sectional view of a camera according to a first embodiment of the present invention. FIG. 1(a) shows the state when the release operation is not performed, and FIG. 1(b) shows the state when the release operation is not performed. It shows the state at the time of the accident.

In FIG. 1, 1 is the second lens group (compensator lens group in this embodiment) constituting the photographic optical system, and 2 is the second lens group (variator lens group in this embodiment) of the photographic optical system. The second lens group 1 and the second lens group 2 constitute a photographing optical system of a two-group zoom optical system.

The first lens group 1 of the photographing optical system is held in a first group lens barrel 3, and the first group lens barrel 3 is screwed onto a first screw shaft 4 parallel to the optical axis and is movable along the screw shaft. It becomes. The first screw shaft 4 is rotatably supported by a stationary member such as a camera body, and gears 5 and 6 are fixed to both ends of the screw shaft 4. The gear 5 meshes with teeth 7a on the outer periphery of a photographic optical system protective lid 7, and the protective lid 7 is arranged at the front end of the camera body to be rotatable about a pivot shaft 7b parallel to the optical axis. .

A gear 6 at the rear end of the first screw shaft 4 can mesh with a gear to be described later, and is driven by a driving force transmission system to be described later.

The second lens group 2 is held by a second group lens barrel 8, and the second group lens barrel 8 is screwed onto a second screw shaft 9 parallel to the optical axis and is movable along the screw shaft. There is. The screw shaft 9 is supported within the camera body so that it can only rotate, and a gear 10 fixed to the rear end of the screw shaft is rotated by a drive power transmission system to be described later via an intermediate gear 11. It is now possible to do so.

A power shaft 12 is arranged close to the first screw shaft 4 and parallel to the first screw shaft 4, and the rear end of the power shaft 12 is connected to a motor 13.
is connected to the shaft of The power shaft 12 is rotatably supported by a support within the camera body, and a hollow shaft 14 is provided on the power shaft 12 and is movable in the axial direction by spline fitting or the like between the power shaft 12 and the power shaft 12. It is fitted.

A gear 15 for transmitting power to a finder optical system, which will be described later, is fixed to the front end of the hollow shaft 14, and a pair of gears 16 and 15 are fixed to the rear end of the hollow shaft 14 at intervals in the axial direction. 1st frame is fixed. That is, the hollow shaft 1
4 is rotatable integrally with a power shaft 12 directly connected to the motor shaft and is movable in the axial direction on the power shaft, and three gears 15 and 16 are fixed integrally with the hollow shaft 14; 17 rotates together with the hollow shaft and moves in the axial direction.

The tip of one arm of a lever 19 that rotates around an axis 19a in a direction perpendicular to the plane of FIG. 1 is inserted into a recess 18 formed between the gear 16 and the gear 17. 19's other arm 19b and part of the camera body 20
A spring 21 is tensioned between the lever 19 and the lever 19 to bias the lever 19 counterclockwise about the shaft 19a. The lever 1
The arm 19b of No. 9 is made of a magnetic material, and an electromagnet 22 for attracting the arm 19b is placed on the rotation trajectory of the arm 19b.
is located. The electromagnet 22 is controlled by a control device described later.

Among the pair of gears 16 and 17 fixed to the rear end of the hollow shaft 14, the front gear 16 is the gear 6 of the first screw shaft 4.
The rear gear 17 is a gear for transmitting the power of the motor 13 to the gear 10 of the second screw shaft 9. In the case of this example,
The front gear 16 is engaged with the gear 6 of the first screw shaft 4 only from the time the release operation is performed until a predetermined time has elapsed after the end of photography, and the rear gear 17 is engaged with the intermediate gear 11 at times other than when the release is released. It is designed to be intertwined with

A first intermediate gear 23 that meshes with the gear 15 at the front end of the hollow shaft 14. A second intermediate gear 24 is engaged with the second intermediate gear 24, and a third intermediate gear 25 that is engaged with a gear 26 fixed on the finder optical system drive shaft 27 is fixed to a shaft integrated with the second intermediate gear 24. There is. The finder optical system drive shaft 27 is formed with a threaded portion, and the 6-movement lens barrel 28a of the finder optical system 28 is screwed into the threaded portion. It is possible to rotate it back and forth along the threaded part (parallel to the optical axis). A zoom operation member (not shown) is connected to the movable lens barrel 28a, and the 8-movement lens barrel 28a can also be moved back and forth by manually operating the zoom operation member. It is configured.

The finder optical system 28 includes the aforementioned movable lens barrel 28.
a, a movable lens 28b supported by the movable lens barrel 28a, and a fixed lens group other than the hexagonal lens. In this embodiment, the movable lens barrel 28a and the finder optical system drive shaft 27 constitute a view angle changing means for changing the view angle of the finder optical system.

An angle of view detection means 29 for detecting the position (i.e. angle of view) of the movable lens barrel 28a is arranged close to the movable lens barrel 28a, and the output signal of the detection means 29 is controlled by the control described below. It is designed to be input to the photographing optical system focal length detection circuit within the device. The view angle detection means 29 is constituted by, for example, a known non-contact position detector. The output signal of the view angle detection means 29 is input to a photographing optical system focal length detection circuit in a control device 33, which will be described later, and the focal length of the photographing optical system is detected by the detection circuit.

30 is a motor rotation amount detector such as a rotary encoder placed concentrically with the rotor of the motor 13, and the detector 30 detects the position and amount of movement of the first group lens 1 and the position and amount of movement of the second group lens 2. This constitutes a photographing optical system position and movement amount detecting means for detecting the position and movement amount of the photographing optical system. The detector 30 constitutes movement and positioning control means for the first group lens 1 and the second group lens 2 together with a control device 33 to be described later.

31 is a known distance measuring unit including a light emitting element, a light receiving element, and a distance measuring circuit; 32 is a known photometry unit including a light emitting element, a light receiving element, and a photometry circuit; 33 is an arithmetic circuit, a sequence controller, a memory, and various controls. A control device including circuits, etc., 34 is a power source, and 35 is an imaging plane.

FIG. 3 is a schematic diagram of the electrical configuration of the camera of this embodiment. In FIG. 3, 29 is the above-mentioned angle of view detection means;
30 is a motor rotation amount detection means, 31a is a distance measuring unit 3
1, 32a is a photometry circuit built in photometry unit 32, 33a is a main control circuit including an arithmetic circuit, a sequence controller section, and a memory that constitute the control device 33, and 33b is a main control circuit including a memory. The motor control circuit 33c included in the control device 33
33d is a shutter control circuit, 33e is a film winding and rewinding control circuit, 33
f is a photographic optical system focal length detection circuit 33 that detects the focal length of the photographic optical system based on the output signal of the field angle detection means 29;
g is a display circuit for operating a device (not shown).

Further, 36 is a zoom operation interlocking switch that is linked to a zoom operation member (not shown), and when the camera user operates the zoom operation member (not shown) to the long focus side, a contact piece is inserted into contact a. It is a switch in which contact C and contact a are connected, and when the camera user operates the zoom operation member to the short focus side, the contact piece is recessed into the contact and the contact C and contact A are connected. Since the switch 36 is a switch with no memory of operation, when the camera user stops operating the zoom operation member, the contact piece immediately returns to the neutral position and is turned OFF.

Reference numeral 37 denotes a switch that is turned on when the camera user depresses a release button (not shown) by half a stroke.In response to the turning on of the switch 37, the main control circuit 33a performs a battery check operation, a photometry operation, and a distance measurement operation. At the same time, the focal length of the photographic optical system is detected.

Reference numeral 38 denotes a switch that is turned on when the release button is pressed down the entire stroke. In the main control circuit 33a, control operations of the motor control circuit 33b, electromagnet control circuit 33c, etc. are started in response to the turning on of the switch 38.

Reference numeral 39 denotes a first lens group initial position detection switch that is turned on when the first lens group 1 and the first lens barrel 3 are at a predetermined initial position; the switch 39 is turned on by the first lens barrel 3.

FIG. 3 is a flowchart of an operation sequence program executed within the main control circuit 33a in the electrical configuration shown in FIG.

The operation of each part of the camera of this embodiment will be explained below with reference to FIGS. 1 to 3.

When the camera is not in use, the internal mechanism of the camera is shown in Figure 1 (a).
In the state shown in , the first lens group 1 is housed in the camera body, and the protection M7 completely covers the front of the first lens group 1. If the control device 33 and the power supply 34 are electrically connected in this state, the third
As shown in the flowchart in the figure, first, it is checked whether the switch 37 is turned on, and the switch 37 is checked.
When the switch 7 is not turned on, the process moves to the flow on the right side of FIG. 3, and it is checked whether the switch 36 is turned on to either the contact A or the contact O. In this case, switch 36
If it is OFF, a command to stop the motor 13 causes the internal mechanism of the camera to be in a standby state.

The sequence for starting the 1ffi shadow preparation action begins with checking whether the switch 37 is retracted, and then
If the switch 36 is not turned on (that is, the release operation is not performed), a check is made to see if the switch 36 is turned on.

When a camera user operates a zoom operation member (not shown), for example, to the short focal length side while looking through the viewfinder to determine composition before taking a picture, the contact piece of the switch 36 is inserted into contact a and contact a and contact C Since the main control circuit 33a controls the motor control circuit 33b to rotate the motor 13 in the normal direction, the main control circuit 33a controls the motor control circuit 33b to cause the motor 13 to rotate in the normal direction. Figure 1 (a
), when the motor 13 is rotated forward, the hollow shaft 14, the gear 15, the intermediate gears 23, 24 and 25, the gear 26,
The movable lens barrel 28a of the finder optical system 28 is moved to the short focus side via the finder optical system drive shaft 27, and the view angle of the finder changes to the short focus side.At the same time, the gear 17, the intermediate gear 16, and the gear 10 , screw @9, the second group lens barrel 8 moves toward the short focus side along the optical axis. The change in position of the moving lens barrel 28a at this time is detected by the angle of view detection means 29, and the detection result is sent to the control device 3.
3 feedback will be given. Further, a change in the position of the second group lens barrel 8 (that is, a change in the focal position of the photographing optical system or a change in the photographing magnification) is detected by the motor rotation amount detection means 30, and the detection result is manually input to the main control circuit 33a. The main control circuit 33a then operates the display circuit 33 to display the detection result on a display device (not shown).

On the other hand, when the camera user operates a zoom operation member (not shown) toward the long focus side, the contact piece of the switch 36 is closed to the contact point, so that the motor 13 is reversed from the main control circuit 33a to the motor control circuit 33b. The command is issued and motor 1
3 is reversed. As a result, the 8th lens barrel 28a of the finder optical system 28 is moved to the long focal point side by the same power transmission system as described above, and at the same time, the 2nd group lens barrel 8 is also moved to the long focal point side.

When the camera user releases his/her hand from the zoom operation member during zoom operation, the switch 36 is turned OFF, so the motor 13 is immediately stopped and the 8mm lens 28 of the finder optical system is turned off.
Both the movement of lens b and the movement of the second lens group 2 are stopped immediately.

When the magnification changing operation as described above is completed, the focal length change of the photographing optical system and the view angle change of the finder optical system are stored in the memory in the main control circuit 33a, and the main control circuit 33a returns to the standby state.

Next, when the camera user presses the release button (not shown) halfway, the switch 37 is turned on, and the main control circuit 33a causes the photometry circuit 32a and the distance measurement circuit 31a to perform photometry and distance measurement, and also turns on the voltage of the power supply 34. Check. Next, the main control circuit 33a performs the first control based on the previously detected focal length information of the photographing optical system, the subject distance information detected by the distance measuring circuit 31a, and the subject brightness information detected by the photometric circuit 32a. The amount of movement of the first group lens 1 is calculated, and the calculation result is stored in the memory, and the focal length information, object distance information, and object brightness information of the photographing optical system are also stored in the memory. At the same time, the display circuit 33g is operated to display object distance information and object brightness information on the display device. Therefore, by confirming this display, when the camera user subsequently presses the release button all the way, the switch 38 is turned on, and the main control circuit 33a
First, the electromagnet control circuit 33c is operated to energize the electromagnet 22. When the electromagnet 22 is energized, the lever 1
Since the arm 19b of 9 is attracted to the electromagnet 22, the lever 19 is rotated clockwise in FIG.
17 and the hollow shaft 14 are moved to the left in FIG. is removed.

In this state, it is checked whether the switch 39 is OFF or not, and if the switch 39 is OFF (that is, if the first group lens barrel 3 is positioned at a predetermined initial position), the main The control circuit 33a operates the motor control circuit 33b to rotate the motor 13 in the normal rotation direction. If the switch 39 is not turned off, the main control circuit 33a starts the motor 13 in the reverse direction, so that the first group lens barrel 3 moves rearward through the meshing relationship between the gears 16 and 6. Drive to. And 1
When the group barrel 3 reaches the initial position, the switch 39 turns O.
When detected by the FF, the motor 13 is now rotated in the forward direction.

When the motor 13 is rotated in the forward direction, the hollow shaft 14 and the gear 16 are rotated in the forward direction along with the power shaft 12, and the gear 6 is rotated in the forward direction.
At the same time, the screw shaft 4 is rotated in the opposite direction. By rotating the screw shaft 4 in the opposite direction, the first group lens barrel 3 is rotated as shown in FIG.
) Start moving forward from the position. On the other hand, since the gear 5 is rotated, the protective lid 7 is rotated around the shaft 7b, and the protective lid 7 is rotated.
moves from the forward position of the first lens group 1 to the retracted position, allowing the first lens group lens barrel 3 to move forward.

The amount of forward movement of the first group lens barrel 3 is determined by the motor rotation amount detection means 30.
The output signal of the detection means 30 is compared within the main control circuit 33a with the calculation result read from the memory. Then, the calculation result (the amount of movement to be given to the first group lens 1) and the motor rotation amount detection means 30
When the actual movement amount detected by the main control circuit 33 matches
a determines that the movement of the photographic optical system has been completed and turns the motor 13
to stop. This completes the focusing operation of the photographing optical system, so the main control circuit 33a
d is operated to open and close the shutter, and the exposure to the imaging plane 35 is completed.

After the exposure is completed, the main control circuit 33a switches to the motor control circuit 33b.
is operated to reverse the motor 13, and the first group lens barrel 3 is retreated from the position shown in FIG. 1(b) to the initial position. When the first group lens barrel 3 retreats to the initial position, the switch 39 is turned off, so the main control circuit 33a stops the motor 13 via the motor control circuit 33b, and then stops the electromagnet 22 via the electromagnet control circuit 33c. Stop the power supply to. Therefore, the electromagnet 22 for the arm 19b of the lever 19
The attraction force disappears, and the lever 19 is rotated counterclockwise around the shaft 19a by the force of the spring 21 from the position shown in FIG.
17 and the hollow shaft 14 are moved to the right from the position shown in FIG. They are engaged and returned to the state shown in FIG. 1(a).

Note that after the first group lens barrel 3 retreats from the position shown in FIG. 1(b) and enters into the camera body, the protector M7 is rotated about the shaft 7b and the protector M7 is moved again. is shown in Figure 1 (
The same goes for returning to position a).

Then, after the first group lens barrel 3 and the second group lens barrel 8 are in the state shown in FIG. , the main control circuit 33a returns to the standby state again.

In the embodiment shown in FIG. 1, the angle of view of the finder optical system is detected by the angle of view detection means 29, but as shown in FIG. A second group lens barrel position detection means 40 may be provided and used in place of the field angle detection means 29.

Alternatively, as shown in FIG. 4(b), a detection means 41 for detecting the rotation speed and rotation angle of the gear 10 for driving the second group lens barrel is provided, and the output signal of the detection means 41 is sent to the field angle detection means 29. The position of the second group lens barrel 8 may be detected by using it instead of the output signal.

In the embodiment shown in FIG. 4(C), a detection means 42 for detecting the initial position of the first group lens barrel 3 is added to the embodiment shown in FIG. In this embodiment, motor rotation amount detection means 30
serves as a detection means for detecting the position of the second group lens barrel 8.

In the embodiment shown in FIG. 4, each of the detection means 40 to
Since the parts other than 42 have the same configuration as the embodiment shown in FIG. 1, their explanation will be omitted.

In the embodiment shown in FIG. 5, the view angle changing means of the finder optical system and the first group lens 1 are configured to work together, and the view angle of the finder optical system is changed by the zoom operation during framing before the release operation. The first lens group 1 is moved as the lens is moved. The second group lens 2 is moved by the motor 13 when the gear 17 and the gear 11 are engaged with each other during a release operation, and focus adjustment (focusing) is performed by the movement of the second group lens 2.

In this embodiment, the structural members are the same as those in the embodiment shown in FIGS. 1 and 4, and the structure and control operation of the control device 33 are also the same as in the embodiment shown in FIGS. A description of the operation and control operation of the control device will be omitted.

FIG. 6 is a diagram showing another embodiment of the present invention. In this embodiment, a motor for moving the first group lens 1 and a motor for moving the second group lens 2 are mounted separately, and a detection means for detecting the amount of movement of the first group lens 1 and a motor for moving the second group lens 2 are mounted separately. The difference from the embodiment shown in FIGS. 1 to 5 is that a detection means for detecting the amount of movement of the lens 2 is provided separately, and a power transmission switching mechanism and an electromagnet 22 as its control means are not provided. ing.

In FIG. 6, 43 is fixed to the power shaft 12 and is connected to the gear 1.
A gear 44 is fixed to the shaft of a motor 45 for driving the first lens barrel and is engaged with a gear 6.
Reference numeral 46 denotes a first group lens position and movement amount detecting means for detecting the movement amount and position of the first group lens barrel 3 by detecting the amount of rotation of the motor 45. Note that in FIG. 6, members indicated by the same reference numerals as in FIG. 1 are the same members as those shown in FIG. 1, and therefore their explanations will be omitted. Further, as shown in FIG. 7, the electrical configuration including the control device 33 is almost the same as that in FIG. 2, but the number of motors controlled by the motor control circuit 33b is two. and,
1st group lens position and I3! This embodiment differs from the embodiment shown in FIG. 1 in that an ffi detection means 46 is connected and an electromagnet control circuit 33c is not provided.

FIG. 8 is a flowchart of a control program executed by the main control circuit in the control device 33 in the configuration shown in FIG.

When a camera user operates a zoom operation member (not shown), for example, to the short focal length side while looking through the viewfinder to determine composition before taking a picture, the contact piece of the switch 36 is inserted into contact a and contact a and contact C Since the main control circuit 33a controls the motor control circuit 33b to rotate the motor 13 in the normal direction, the main control circuit 33a controls the motor control circuit 33b to cause the motor 13 to rotate in the normal direction. Figure 6 (a
) When the motor 13 is rotated forward, the screw shaft 9 is rotated via the gear 43 and the gear 11, and the second group lens barrel 8 is moved along the optical axis. ,
The screw shaft 27 is rotated through the gears 23, 24, 25, and 26, and the movable lens barrel 28a of the finder optical system 28 is moved in the optical axis direction. As a result, the angle of view of the finder optical system is shortened. At the same time, the focal length of the photographing optical system changes to the short focus side. Then, at the same time as the angle of view of the finder optical system is detected by the angle of view detection means 29, the focal length of the photographing optical system is detected by the motor rotation amount detection means 30.
The output signal of 0 is stored in the memory within the main control circuit 33a and displayed on a display device operated by the display circuit 33g.

On the other hand, when the camera user operates a zoom operation member (not shown) toward the long focus side, the contact piece of the switch 36 is closed to the contact point, so that the motor 13 is reversed from the main control circuit 33a to the motor control circuit 33b. The command is issued and motor 1
3 is reversed. As a result, the movable lens barrel 28a of the finder optical system 28 is moved toward the long focal point side by the same power transmission system as described above, and at the same time, the second group barrel 8 is also moved toward the long focal point side.

When the camera user releases his/her hand from the zoom operation/member during zoom operation, the switch 36 turns OFF, so the motor 13
is immediately stopped, and the moving lens 2 of the finder optical system
Both the movement of the lens 8b and the movement of the second lens group 2 are stopped immediately.

When the magnification changing operation as described above is completed, the focal length information of the photographing optical system and the view angle change of the finder optical system are stored in the memory in the main control circuit 33a, and the main control circuit 33a returns to the standby state.

Next, when the camera user presses the release button (not shown) halfway, the switch 37 is turned on, and the main control circuit 33a causes the photometry circuit 32a and the distance measurement circuit 31a to perform photometry and distance measurement, and also turns on the voltage of the power supply 34. Check. Next, the main control circuit 33a performs the first control based on the previously detected focal length information of the photographing optical system, the subject distance information detected by the distance measuring circuit 31a, and the subject brightness information detected by the photometric circuit 32a. The amount of movement of the first group lens 1 is calculated, and the calculation result is stored in the memory, and the focal length information, object distance information, and object brightness information of the photographing optical system are also stored in the memory. At the same time, the display circuit 33g is operated to display object distance information, object brightness information, depth of field, shutter speed, etc. on the display device.

Therefore, by confirming this display, when the camera user subsequently presses the release button all the way, the switch 38 is turned on, and the main control circuit 33a is activated by the switch 39.
Check whether it is turned off.

At this time, if the switch 39 is OFF (that is, if the first group lens barrel 3 is positioned at the predetermined initial position), the main control circuit 33a immediately rotates the lens 45 in the forward direction. The motor control circuit 33b is operated. if,
If the switch 39 is not turned off, the main control circuit 3
3a starts the motor 45 in the reverse direction, and drives the first group lens barrel 3 to move rearward through the meshing relationship between the gear 44 and the gear 6. Then, when it is detected that the first group lens barrel 3 has reached the initial position by turning off the switch 39, the motor 45 is rotated in the forward direction.

When the motor 45 is rotated in the forward direction, the screw shaft 4 and the gear 5 are rotated in the opposite direction, and the teeth 7 meshing with the gear 5 are rotated in the opposite direction.
The protection M7 having the shape "a" is rotated about the shaft 7b in a direction perpendicular to the paper plane of FIG. 6, and is retracted from the front position of the first group lens barrel 3 to the side. Further, the rotation of the screw shaft 4 causes the first group lens barrel 3 to be extended forward from the initial position.

The amount of forward movement of the first group lens barrel 3 is detected by the first group lens position and movement detection means 46, and the output signal of the detection means 46 is compared with the calculation result read from the memory in the main control circuit 33a. . And the calculation result (
amount of movement to be given to the first group lens 1) and the detection means 46
When the actual movement amount detected by the main control circuit 33 matches
a determines that the movement of the photographing optical system has been completed and turns the motor 45
to stop. As a result, the path 33a operates the shutter control circuit 33d to open and close the shutter, and the exposure to the imaging surface 35 is completed.

After the exposure is completed, the main control circuit 33a switches to the motor control circuit 33b.
is operated to reverse the motor 45, and the first group lens barrel 3 is retreated from the position shown in FIG. 6(b) to the initial position. When the first group lens barrel 3 retreats to the initial position, the switch 39 is turned off, and the main control circuit 33a stops the motor 45 via the motor control circuit 33b.

Further, after the first group lens barrel 3 retreats from the position shown in FIG. 6(b) and enters into the camera body, the protective lid 7 is rotated about the shaft 7b and the protective lid 7 is turned again. 7 is shown in Figure 6 (a
) is returned to the position.

Then, after the first group lens barrel 3 and the second group lens barrel 8 are in the state shown in FIG. 6(a), the film winding control circuit 33e is activated to wind up one frame of film, and after the film winding is completed, , the main control circuit 33a returns to the standby state again.

In the embodiments shown in FIGS. 6 to 8, the mechanical structure is
- It is simpler than the embodiment shown in FIG. 5, and the camera can be made smaller.

FIG. 9 shows another embodiment similar to the embodiment of FIG. 6. This embodiment is configured so that after manually moving the 8th lens barrel 28a of the finder optical system and the second lens group 2 of the photographing optical system, the lens group 1 of the photographing optical system is automatically moved. There is.

In FIG. 9, 44 is a gear meshing with gear 6;
45 is a motor that drives the gear 44; 47 is a known non-contact type detection means for detecting the position and movement amount of the first group lens barrel 3 by detecting the rotation amount and rotation position of the gear 44; 48 is a gear 24 is an intermediate gear that rotationally drives the gear 48; 49 is a gear fixed coaxially with the gear 48; 50 is a ring-shaped zoom operation ring having internal teeth on the inner circumferential surface that mesh with the gear 49;
A gear 51 meshes with the inner teeth of the zoom operation ring 50 and is fixed to the screw shaft 9 for driving the second group lens barrel. The zoom operation ring 50 is rotatably supported by the camera body, and has knurling formed on its outer peripheral surface so that it can be easily grasped by hand. In FIG. 9, members indicated by the same reference numerals as those in FIG. 6 are the same members as those in the camera of the embodiment shown in FIG. 6, and therefore their explanations will be omitted.

FIG. 10 is a diagram showing the electrical configuration of the camera shown in FIG. 9, and the parts in FIG. 10 labeled with the same symbols as in FIG. 7 are the same parts as in the configuration in FIG. 7. FIG. 11 is a flow chart of a program executed within the main control circuit 33a shown in FIG.

The operation of the camera of this embodiment will be described below with reference to FIGS. 9 to 11.

When the camera is not in use, the internal mechanism of the camera is shown in Figure 9 (a).
In the state shown in FIG. 1, the first lens group 1 is housed within the camera body. At this time, if the control device 33 and the power supply 34 are electrically connected, the first
As shown in the flowchart of FIG. 1, first, it is checked whether the switch 37 is turned on.

When the switch 37 is not turned on, the main control circuit 3
No program is executed within 3a.

When the camera user rotates the zoom operation 3] 50, for example, toward the short focus side while looking through the viewfinder to determine the composition before shooting, the gears 49 and 51 are rotated, and the gears 48, 24, and 51 are rotated. 25. The gear 26, screw glaze 27, and screw shaft 9 are rotated, and as a result, the movable lens barrel 28a of the finder optical system moves toward the short focus side, and the second group lens barrel 8 also moves toward the short focus side. In this case, the amount of movement and the position after the movement of the movable lens barrel 28a of the finder optical system 28 and the amount of movement and the position after the movement of the second lens group 2 are detected by the angle of view detection means 29. The output signal is input to the main control circuit 33a.

Next, when the camera user presses the release button (not shown) halfway, the switch 37 is turned on, and the main control circuit 33a causes the photometry circuit 32a and the distance measurement circuit 31a to perform photometry and distance measurement, and also turns on the voltage of the power supply 34. Check. Next, the main control circuit 33a outputs the focal length information of the photographing optical system previously detected by the angle of view detection means 29, the subject distance information detected by the ranging circuit 31a, and the subject brightness information detected by the photometric circuit 32a. The amount of movement of the first group lens 1 is calculated based on and, and the calculation result is stored in the memory, and the focal length information, object distance information, and object brightness information of the photographing optical system are also stored in the memory. At the same time, the display circuit 33g is operated to display object distance information, object brightness information, depth of field, shutter speed, etc. on the display device. Therefore, by confirming this display, when the camera user subsequently presses the release button all the way, the switch 38 is turned on, and the main control circuit 33a checks the state of the switch 39. At this time, if the switch 39 is turned OFF (that is, if the first group lens barrel 3 is positioned at the predetermined initial position), the main control circuit 33a causes the motor 45 to rotate in the normal rotation direction. The control circuit 33b is operated. If the switch 39 is not turned off, the main control circuit 33a motor 45 is started in the reverse direction, and the first group lens barrel 3 is moved rearward through the meshing relationship between the gear 44 and the gear 6. Drive.

Then, when it is detected that the first group lens barrel 3 has reached the initial position by turning off the switch 39, the motor 45 is rotated in the forward direction.

When the motor 45 is rotated in the forward direction, the screw shaft 4 is rotated in the opposite direction, and by rotating the screw shaft 4 in the opposite direction, the first group lens barrel 3 moves forward from the position shown in FIG. 9(a). start.

The amount of forward movement of the first group lens barrel 3 is detected by the detection means 47, and the output signal of the detection means 47 is sent to the main control circuit 33.
It is compared with the arithmetic result read from the memory in a. Then, when the calculation result (the amount of movement that should be given to the first group lens 1) matches the actual amount of movement detected by the detection means 47, the main control circuit 33a determines that the movement of the photographing optical system has been completed. The determination is made and the motor 45 is stopped. As a result, the focusing operation of the photographing optical system is completed, and the main control circuit 33a operates the shutter control circuit 33d to open and close the shutter, thereby completing the exposure of the image plane 35.

After the exposure is completed, the main control circuit 33a switches to the motor control circuit 33b.
is operated to reverse the motor 45, and the first group lens barrel 3 is retreated from the position shown in FIG. 9(b) to the initial position. When the first group lens barrel 3 retreats to the initial position, the switch 39 is turned off, so the main control circuit 33a motor control circuit 3
3b, the motor 45 is stopped, and then the film winding and rewinding control circuit 33e is operated to
Pieces are hoisted.

In this embodiment, since the angle of view and the magnification are changed manually, the camera can be made lower in cost and lighter than the camera in the embodiment shown in FIG.

FIG. 12 shows a partially modified embodiment of the embodiment shown in FIG. The camera shown in FIG. 12 is different from the camera shown in FIG. 9 in the structure of the second group lens barrel 8 and the structure of the drive mechanism that engages with the lens barrel 8.

In the camera of this embodiment, a threaded portion 8a is formed on the outer peripheral surface of the tip end of the second group barrel 8, and the threaded portion 8a is screwed into a threaded hole formed in the camera body member 20. Also,
A gear portion 8b is formed on the outer peripheral surface of the rear end of the second group lens barrel 8, and the gear portion 8b meshes with the gear 53. The gear 53 is fixed to a shaft 52 to which the gear 51 is fixed, and the gear 5'1 is used for zoom operation T! It meshes with internal teeth formed on the inner peripheral surface of J50.

Therefore, when the camera user rotates the zoom operation ring 50 while holding it with his fingers, the gear 51, shaft 52, and gear 53 are rotated, and the second group lens barrel 8 is rotated and pushed in the axial direction to change the magnification. An action is taken.

Note that in the camera of this embodiment, only the drive mechanism for the second group lens barrel 8 differs from the embodiment shown in FIG. A description of operations other than those of the lens barrel 8 will be omitted. The electrical configuration of the camera shown in FIG. 12 is the same as that of the camera shown in FIG. 9, and has the configuration shown in FIG.

FIG. 13 shows another embodiment of the invention. In this example, 1
The lens barrel 3 in the group is configured to be moved, and the angle of view is changed and the lens barrel 1 in the first group is moved manually.

In FIG. 13, parts indicated by the same reference numerals as in FIGS. 1 to 12 represent the same components as those of the camera of the above-described embodiment. In Figure 13,
Reference numeral 54 is a gear that meshes with the gear 10 and is driven by the motor 55. Reference numeral 56 is a known non-contact gear that generates an output signal representing the position and movement amount of the second group lens barrel B by detecting the rotation angle and rotation position of the gear 54. It is a contact type detection means. The electrical configuration of the camera shown in FIG. 13 is almost the same as that of the camera shown in FIG. 9, and has the configuration shown in FIG. 10. Further, the flowchart of the program within the main control circuit 33a is almost the same as that in FIG.

In the camera shown in FIG. 13, when the camera user rotates the zoom operation ring 50 while holding it with his or her fingers, the zoom operation ring 50
The gear 51 meshing with the teeth on the inner circumferential surface of 0 is rotated,
The screw shaft 4 integrated with the gear 51 is rotated, and the first group lens barrel 3, which is threaded onto the screw shaft 4, is extended forward from the initial position. On the other hand, since the zoom operation ring 50 is rotated, the screw shaft 27 is rotated via the gears 49, 48, 24, 25, and 26, so that the moving lens barrel 28a of the finder optical system 28 moves toward the optical axis. , the angle of view of the finder optical system is changed. The angle of view of the finder optical system is detected by the angle of view detection means 29;
The output signal No. 9 is manually input to the main control circuit 33a in the control device 33. Then, focal length information of the photographing optical system is recorded in the memory in the main control circuit 33a based on the output signal.

When the release button (not shown) is pressed down half a stroke, the switch 37 in FIG. is turned on, and the program shown in FIG. 11 is executed in the main control circuit 33a. That is,
When the switch 38 is turned on and the switch 39 is turned off,
The motor 55 is rotated in the normal direction, and the second group lens barrel 8 is moved by a pre-calculated movement distance to perform a focusing operation. The amount of movement of the second group lens barrel 8 at this time is detected by the detection means 56, and the output signal of the detection means 56 is fed back to the main control circuit 33a to control the amount of rotation of the motor 55.

FIG. 14 is a modified embodiment of FIG. 13. In this embodiment, the drive mechanism of the first group barrel 3 and the structure of the first group barrel 3 are changed from the embodiment shown in FIG. 13, and the operation is completely the same as the embodiment shown in FIG. In the camera of this embodiment, a threaded part 3a and a gear part 3b are formed on the outer peripheral surface of the first group barrel 3, and the threaded part 3a is screwed into a threaded hole formed in the camera body member 20. The gear portion 3b is a drive lIh57
It meshes with a gear 58 fixed to. A gear 51 is rotatably attached to the drive shaft 58, and the gear 51 meshes with a gear on the circumferential surface of the zoom operation ring 50.

Therefore, when the camera user performs the zoom operation when framing
When J50 is rotated with a finger, the first group lens barrel 3 is rotated and moved in the axial direction via the gear 51, shaft 57, and gear 58, and as a result, the viewfinder optical system is moved in the same way as the camera shown in FIG. The angle of view change and the movement of the first lens group 1 are performed simultaneously.

In the cameras of the embodiments shown in FIGS. 1 to 14, the field of view within the finder changes as shown in FIG. 15 in response to changes in the angle of view of the finder optical system.

Figure 15(a) shows the viewfinder screen when the focal length of the photographic optical system is set to the short focus side, and Figure 15(b)
15(C) is the finder screen when the focal length of the photographing optical system is set to the standard value, and FIG. 15(C) is the finder screen when the focal length of the photographing optical system is set to the long focal length side.

FIG. 16 is a diagram showing a modified embodiment of the embodiment shown in FIG. This embodiment is characterized in that the finder optical system is equipped with a view angle changing means without a moving lens barrel. That is, the finder optical system 60 of the camera of this embodiment does not have a moving lens or a moving lens barrel, but instead has a variable field of view frame Bo having a pattern as shown in FIG.
A is provided. The variable field of view frame 60a is made of, for example, a liquid crystal, and is configured so that the field of view can be changed by changing the energization range for the variable field of view frame 60a. It is electrically linked to the position of lens group 2 (ie, variator lens group). Variable field of view frame 6
Angle of view detection means 59 for detecting the size of the field of view at 0a
is arranged near the variable field of view frame 60a, and the motor 13 is controlled by the control device 33 in accordance with the output signal of the field angle detection means 59.

The field of view of the variable field of view frame Boa is as shown in Fig. 18 (a) when the photographing optical system is set to a short focal length, and as shown in Fig. 18 (b) when the focal length of the photographing optical system is set to the standard value. When the focal length of the wi-shadow optical system is set to a long focal point, the image becomes as shown in FIG. 18(C).

If a variable field frame as shown in FIG. 16 is employed as the view angle changing means of the finder optical system, the finder view angle changing means can be downsized and the finder optical system can also be downsized.

In addition, in the embodiment shown above, a case has been explained in which a well-known analog type motor is used as a motor for moving the photographing optical system, but a step motor that can be driven by a digital signal can be used in place of the analog type motor. Of course. If a step motor is used, a feedback detection means is not required, so that it is possible to further reduce the size and weight of the camera.

[Effects of the Invention] As explained above, the camera of the present invention is configured such that the angle of view changing means provided in the finder optical system and the first group lens or the second group lens of the photographing optical system are linked. The angle of view changing means and the first
After the group lens or the second group lens is operated in conjunction with each other, the focusing operation of the photographing optical system is automatically performed at the time of release, which solves various problems in conventional cameras. be able to. Therefore, according to the present invention, it is possible to provide a camera which is lighter and more compact than conventional cameras, and which is less likely to damage the lens barrel when not photographing.

[Brief explanation of the drawing]

1(a) and 1(b) are horizontal sectional views showing a schematic structure of a camera according to a first embodiment of the present invention, FIG. 2 is a schematic view showing an electrical configuration of the camera of FIG. 1, and FIG. The figure is a flowchart of the control program executed by the main control circuit included in the electrical configuration of Figure 2, Figures 4 (a), (b),
(C) is a schematic sectional view showing a partially modified embodiment of the camera according to the first embodiment of the present invention, FIG. 5 is a schematic sectional view of the camera according to the second embodiment of the present invention, and FIG. 6(a) , (b) is a schematic sectional view of a camera according to a third embodiment of the present invention, FIG. 7 is a schematic diagram showing the electrical configuration of the camera of FIG. 6, and FIG. Flowchart of the control program executed by the included main control circuit, FIG. 9(a), (
b) is a schematic diagram of a camera according to a fourth embodiment of the present invention, FIG. 10 is a diagram showing the electrical configuration of the camera of FIG. 9, and FIG. 11 is a diagram showing the main components included in the electrical configuration of FIG. 12 is a diagram showing a partially modified embodiment of the camera in FIG. 9; FIG. 13 is a schematic diagram of a camera according to a fifth embodiment of the present invention; FIG. The figure shows a partially modified embodiment of the camera in Figure 13, and Figure 15(a).
, (b) and (c) are diagrams showing changes in the angle of view of the finder optical system installed in the camera shown in FIGS. 1 to 14, and FIG. 16 is the sixth embodiment of the present invention. 17 is a schematic diagram of the camera shown in FIG. 16, and FIG.
Figures (a), (b), and (c) are diagrams showing changes in the angle of view of the finder optical system of the camera shown in Figure 16. l...Compensator lens group (first lens) 2...
Variator lens group (second lens group) 3...1st group barrel 7...Protective lid 8...2nd group barrel 12
...Power shaft 13...Motor 14...Hollow shaft 19...Shipper 20...Camera body member 21...Spring 22...Electromagnet 28...
Finder optical system 28a...Moving lens barrel 29...Angle of view detection means 30...Motor rotation total detection means 31...Distance measurement unit 32...Photometry unit 33
...Control device 34...Power source 35...Imaging surface 31a...Distance measurement circuit 32a...Photometering circuit
33a... Main control circuit 33b... Motor control circuit 33c... Electromagnet control circuit 33d... Shutter control circuit 33e... Film winding and rewinding control circuit 33f.
...Photography optical system focal length detection circuit 33g...Display circuit 45...Motor 50...Zoom operation ring 55.
...Motor 59...Angle of view detection means 60...Finder optical system 60a...Variable field of view frame Fig. 2 1 (a) Fig. (b) Fig. 4 (b) Fig. 5 J4 Fig. 6 (b) Figure <a> Figure 9 (b) Figure 10 Figure 12

Claims (1)

[Scope of Claims] 1. In a camera having a photographing optical system including a variator lens group and a compensator lens group, and a finder optical system independent of the photographing optical system, An angle of view changing means capable of changing an angle, a variator lens group moving means for moving the variator lens group, an interlocking means for interlocking the angle of view changing means and the variator lens group moving means, and the compensator lens. Compensator lens group moving means for moving the group, and the compensator lens group moving means is configured to be able to operate independently of the view angle changing means and the variator lens group moving means. A camera featuring 2. In a camera having a photographing optical system including a variator lens group and a compensator lens group, and a finder optical system independent of the photographing optical system, an image that can change the angle of view in the finder optical system An angle changing means, a variator lens group moving means for moving the variator lens group, an interlocking means for interlocking the view angle changing means and the variator lens group moving means, and a linking means for moving the compensator lens group. Compensator lens group moving means, and compensator lens group movement control for controlling the moving means for the compensator lens group so as to move the compensator lens group to a position corresponding to the angle of view of the finder optical system or the position of the variator lens group. A camera comprising means. 3. The compensator lens group movement control means includes variator lens group position detection means for detecting the position of the variator lens group or field angle detection means for detecting the field angle of the finder optical system. The camera according to claim 2. 4. The camera according to claim 1, wherein the focusing operation is performed by the compensator lens group moving means. 5. In a camera having a photographing optical system including a variator lens group and a compensator lens group, and a finder optical system independent of the photographing optical system, an image capable of changing the angle of view in the finder optical system. An angle changing means, a variator lens group moving means for moving the variator lens group, an interlocking means for interlocking the view angle changing means and the variator lens group moving means, and a linking means for moving the compensator lens group. Compensator lens group moving means, focal length detecting means for detecting the focal length of the photographic optical system, distance measuring means for detecting the subject distance, focal length information detected by the focal length detecting means, and the distance measuring means a calculation means for calculating the position of the compensator lens group with respect to the imaging plane based on the object distance information detected by the image forming apparatus; and a driving means for driving the compensator lens group moving means by the output of the calculation means. A camera characterized by: 6. The camera according to claim 5, wherein the compensator lens group moving means is driven only when a release operation is performed. 7. In a camera having a photographing optical system including a variator lens group and a compensator lens group, and a finder optical system independent of the photographing optical system, an image capable of changing the angle of view in the finder optical system. an angle changing means, a compensator lens group moving means for moving the compensator lens group;
The variator lens group moving means is provided with an interlocking means for interlocking the view angle changing means and the compensator lens group moving means, and a variator lens group moving means for moving the variator lens group, and the variator lens group moving means is configured to adjust the view angle. A camera configured to operate independently of the changing means and the compensator lens group moving means. 8. In a camera having a photographing optical system including a variator lens group and a compensator lens group, and a finder optical system independent of the photographing optical system, an image capable of changing the angle of view in the finder optical system. an angle changing means, a compensator lens group moving means for moving the compensator lens group;
interlocking means for interlocking the view angle changing means and the compensator lens group moving means; variator lens group moving means for moving the variator lens group; A camera comprising: variator lens group movement control means for controlling the variator lens group movement means to move the variator lens group to a position corresponding to the position of the compensator lens group. 9. The variator lens group movement control means includes a compensator lens group position detection means for detecting the position of the compensator lens group or a field angle detection means for detecting the field angle of the finder optical system. The camera according to claim 8. 10. The camera according to claim 8, wherein the focusing operation is performed by the variator lens group moving means. 11 In a camera having a photographing optical system including a variator lens group and a compensator lens group, and a finder optical system independent of the photographing optical system, an image that can change the angle of view in the finder optical system is provided. an angle changing means, a compensator lens group moving means for moving the compensator lens group;
An interlocking means for interlocking the view angle changing means and the compensator lens group moving means, a variator lens group moving means for moving the variator lens group, and a focal length detecting means for detecting the focal length of the photographing optical system. a distance measuring means for detecting a subject distance; and a position of the variator lens group relative to the imaging plane based on the focal length information detected by the focal length detecting means and the subject distance information detected by the ranging means. What is claimed is: 1. A camera comprising: a calculation means for calculating , and a drive means for driving the variator lens group moving means based on the output of the calculation means. 12. The camera according to claim 11, wherein the variator lens group moving means is driven only at the time of release. 13. The camera according to claims 1, 2, 5, 7, 8, and 11, wherein the photographing optical system is a two-group zoom optical system. 14 The photographic optical system is a two-group zoom optical system, and the first group optical system of the photographic optical system performs focal length adjustment (magnification change) and focusing of the photographic optical system at the time of release, and the focal length adjustment (magnification change) and focusing of the photographic optical system are performed at the time of release. The camera according to any one of claims 1, 2, 5, 7, 8, and 11, wherein the first group optical system is configured to be housed within the camera body. 15. Claims 1, 2, 5, 7, characterized in that the photographing optical system is a two-group zoom optical system, and the moving means of the two-group zoom optical system is constituted by a helicoid.
, 8 and 11. 16 Either one of the variator lens group moving means and the compensator lens group moving means constituting the photographing optical system moving means is driven by power during a release operation, and when the shutter is not released, the viewing angle changing means and the compensator lens group moving means are driven. Claims 1, 2, 5, 7, 8, characterized in that the other lens group moving means of the photographing optical system is moved manually.
, the camera according to item 11. 17. The camera according to claim 5, wherein the focal length detection means is means for detecting the amount of rotation of the drive means. 18. Claim 5, characterized in that a display means for displaying a focal length detection value of the photographing optical system is provided.
, 11.