KR100233384B1 - Parallax correction apparatus for a viewfinder and optical apparatus and camera - Google Patents

Abstract

The present invention relates to a parallax correction apparatus for a finder having an optical axis different from that of an imaging optical system, comprising: calculating means for calculating a parallax correction signal of a finder based on a focal length and a focal length of the imaging optical system; According to the operation result of the characterized in that it provides a device such as a camera having a drive means for driving the finder.

Description

Parallax correction device for finders, optics and camera

The present invention relates to a parallax correction device for a finder having an optical axis different from that of an imaging optical system.

In general, in a camera having a finder using an optical system with a different optical axis than a photographing (imaging) optical system such as a compact camera, there is a problem that the range actually photographed on the film surface does not completely match the range observed by the finder. Holding it. This phenomenon is called parallax, and various methods have been developed to correct the parallax.

For example, studies have been conducted to form a plurality of parallax field-of-view frames in the finder field, to give the photographer a target of parallax, or to move the finder field in accordance with the shooting distance. Japanese Unexamined Patent Application Publication No. 3-92831 uses a variable-pitch angle prism for the finder optical system, and adjusts the vertex angle according to the shooting distance to correct the parallax.

On the other hand, in the case of using a zoom optical system for the photographing lens, it is common to adopt a zoom optical system for the finder and zoom the finder in conjunction with the zooming of the photographing lens, but in such a case, zooming the finder optical system as well as the shooting distance Parallax also occurs in. This tongue is prominent as the zoom ratio becomes higher. Therefore, Japanese Patent Application Laid-Open No. 7-86631 discloses a configuration in which the variable optical system of the finder is mechanically shifted in association with a change in the focal length of the photographing lens.

However, in the method of correcting the parallax by shifting the finder light system by mechanically interlocking with the zooming of the photographing lens, the configuration for performing the mechanical linkage operation is complicated, resulting in a decrease in reliability, an increase in component score, There was a defect that caused the finder to be enlarged. In addition, since parallax correction is not performed according to the shooting distance, parallax correction still remains in close range shooting and long distance shooting.

The present invention, in order to solve the above problems, arithmetic means for calculating the parallax correction signal of the finder based on the focal length and the focal length of the imaging optical system, and driving the finder based on the parallax correction signal of the calculating means It is an object of the present invention to provide an apparatus such as a camera capable of performing optimal parallax correction in consideration of the focal length and focal length of an imaging optical system without the complexity of the configuration.

1 is a block diagram showing the configuration of a camera according to a first embodiment of the present invention.

2 is a flow chart showing the operation of the microcomputer of the camera of FIG.

3 is a diagram for explaining a parallax correction amount P that is a function of focal length information f and photographing distance information x in the first embodiment of the present invention.

4 is a diagram showing a state in which the parallax correction amount P is digitalized in 10% units.

5 is a flowchart showing the operation of the microcomputer of the camera of FIG. 1 according to the second embodiment of the present invention.

6 is a block diagram showing the configuration of a camera according to a third embodiment of the present invention.

7 is a flowchart showing the operation of the microcomputer of the camera of FIG.

8 is a block diagram showing the configuration of a camera according to a fourth embodiment of the present invention.

9 is a flowchart showing the operation of the microcomputer of the camera of FIG.

10 is a flowchart showing the operation of the microcomputer of the camera of FIG. 1 according to the fifth embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: Zoom finder optical system 2: (Zoom finder optical system) driving circuit

3: Parallax correction finder optical system 4: Parallax correction finder optical system driving circuit

5: measuring device (測距 裝置) 6: shooting lens zoom barrel

7: motor 8: motor driver circuit

9: Zoom distance detection circuit 10: Zoom TELE switch

11: Zoom Wide Switch 12: Switch (SW1)

13: switch (SW2) 14: shooting mode switch

15: Observation device 16: Focus lens (shooting lens zoom tube)

17: shooting distance information detection circuit 20: microcomputer (CPU)

The present invention provides a camera having a calculation means for calculating a parallax correction signal of a finder based on a focal length and a focal length of an imaging optical system, and a driving means for driving the finder based on a parallax correction signal of the calculation means. It is characterized by such devices.

The invention will be apparent from the preferred specific examples shown below.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of this invention is described in detail with reference to drawings.

1 is a block diagram showing the configuration of a camera according to the first embodiment of the present invention, and (1) is a finder optical system for variable focal length (hereinafter also referred to as zoom) having an optical axis different from that of a photographing optical system. (2) is a driving circuit, (3) is a shift-type parallax finder optical system, (4) is a driving circuit, (5) is a measuring device for obtaining shooting distance information, (6) is a zoom tube ( (9) a motor for driving the photographing lens barrel (6), (8) a motor driver circuit for driving the motor (7), (9) the photographing lens barrel with a zoom photographing optical system (6) A focal length detection circuit for detecting and outputting the focal length of the zoom barrel in (6). Denoted at 10 is a zoom TELE switch used for zooming toward telephoto, and at 11 is a zoom wide switch used to zoom at wide angle. Denoted at 12 is a switch to be turned on at the first stroke of the shutter release button (not shown), at 13 is a switch to be turned on at the second stroke of the shutter release button, and 14 is a continuous shooting in the normal shooting mode. Shooting mode switching switch for switching the rapid shooting mode for shooting, (15) is a metering device for obtaining the subject luminance information, (20) is a microcomputer (hereinafter referred to as CPU) for centralized control of these Is).

Next, the operation of the above configuration will be described according to a flow chart showing the flow of operation of the CPU 20 shown in FIG. When the zoom TELE switch 10 or the zoom WIDE switch 11 is operated and turned on by the photographer (step S101) (step S107), the CPU 20 based on the detection result of the focal length detection circuit 9 If the photographing lens barrel 6 is not at the telephoto end or at the wide-angle end (step S102), (step S108), the motor driver circuit 8 is controlled to move the photographing lens barrel 6 to the telephoto side or the wide-angle side. At the same time, the drive circuit 2 drives the zoom finder optical system 1 to the telephoto side or the wide-angle side in association with the driving circuit 2 (step S103). Then, the focal length detection circuit 9 detects that the imaging lens barrel 6 has reached the telephoto end or the wide-angle end (step S104), or (step S110), or the photographer observing the finder has a desired magnification. If the above operation of the zoom TELE switch 10 or the zoom WIDE switch 11 is stopped and turned off (step S105), (step S111), the CPU 20 immediately stops the zooming operation (step S106). , (Step S112).

Next, when the first stroke of the shutter release button (not shown) is made by the photographer and the switch 12 (hereinafter referred to as the switch SW1) is turned on (step S113), the CPU 20 first determines the measuring device ( 5) is driven to perform a ranging operation to obtain shooting distance information x (step S114). Next, the photometric device 15 is driven to perform photometric operation to obtain exposure information (step S115).

Next, the focal length information f is obtained from the focal length detection circuit 9 (step S116), and the parallax correction amount P is calculated based on the focal length information f and the photographing distance information x (step S117). Here, it will be described as being adjusted so that there is no parallax in the far side of the wide angle side. The CPU 20 is programmed to obtain a parallax correction amount P (f, x) which is a function of the focal length information f and the shooting distance information x. An example of this correction amount f, x is shown in FIG.

3 shows that the parallax correction amount P (f, x) increases as the focal length f becomes larger at the same photographing distance x and as the photographing distance becomes smaller at the same focal length. This correction amount P (f, x) may be taken as data (table data) on ROM in CPU 20, and may be calculated | required by calculation of CPU20.

Based on the above parallax correction amount P (f, x), the CPU 20 drives the parallax correction finder optical system 3 by the driving circuit 4 to change the view direction of the finder so as to correct the parallax, When the parallax correction finder optical system 3 reaches the correction amount P obtained in step S117, the driving is stopped (step S118).

In this way, when the photographer operates the shutter release button only by the first stroke, the image in the viewfinder being observed coincides with the actually photographed range.

In this state, when the second stroke of the shutter release is made by the photographer and the switch 13 (hereinafter referred to as switch SW2) is turned ON (step S119), the CPU 20 returns to the above-described shooting distance information x. At the same time, the focus lens is driven to perform focus adjustment (step 120), and the shutter is controlled based on the above exposure information to expose the film surface (step S121). Thus, the photographing operation is completed. After the photography, the film is wound up by a film feeding apparatus not shown.

As described above, by pressing the release button, the parallax correction according to the shooting distance information x and the focal length information f of the zoom barrel is properly operated, and it is possible to correct the parallax approximately constant.

Here, in the present embodiment, since the zoom finder optical system and the parallax correction finder optical system are configured to be driven independently, the following can also be performed.

Fig. 4 shows the digitalization of the parallax correction amount P (f, x) shown in Fig. 3 in 10% units.

In the area where the parallax correction amount P (f, x) is less than 10%, there is no practical problem, and the correction amount is set to "0", and in the area of 10% or more, correction is performed in 10% units. By defining the parallax correction amount in this manner, it is not necessary to drive the parallax correction finder optical system in the region of the correction amount 0%.

In other words, the parallax correction finder optical system does not need to be driven when the photographing optical system has at least one of the far distance and the short focal length. For example, when the focal length information f is less than 40 mm wide, the parallax correction amount P (f, x) becomes 0% regardless of the shooting distance information x, so that the parallax correction finder optical system is not driven.

As described above, the shutter release time lag and the unnecessary parallax correction operation can be reduced.

In the case of shortening the time until the shutter release even a little in shooting, it is necessary to not perform the correction in the parallax area which is not a practical problem in this way. For example, in the rapid shooting mode followed by the moving object, parallax correction can be easily performed.

FIG. 5 is a second embodiment of the present invention which is a partial modification of the flowchart of FIG. 2 showing this example. According to this embodiment, the shooting mode switching switch 14 is turned on, and the rapid shooting mode is selected. In this case, it is possible to shorten the release time lag in the quick shooting mode in which the shutter release is given priority by not calculating the parallax correction amount P in step S117 and parallax correction driving in step S118 in step S122. In addition, in the flowchart of FIG. 5, steps other than step S122 are the same as FIG. 2, and the same steps as FIG. 2 in the step of FIG. 5 are given the same step numbers as FIG.

6 is a block diagram showing the configuration of a camera according to a third embodiment of the present invention, in which portions identical to those in FIG. 1 are denoted by the same reference numerals.

The feature of this third embodiment is that the zoom motor 7, the motor driver circuit 8, the zoom TELE switch and the zoom WIDE switch for performing the zoom operation, which constituted the zoom in the first embodiment. (10) and (11) are abolished and zooming is performed by manually operating the photographing lens barrel 6.

Next, the operation of the above configuration will be described according to a flowchart showing the operation of the CPU 20 shown in FIG.

In FIG. 7, the same step numbers are attached to the same steps as those in FIG.

When the photographer performs the first stroke of the shutter release button (not shown) and the switch SW1 is turned on (step S113), the CPU 20 drives the ranging device 5 to perform a ranging operation, thereby performing the shooting distance information x. (Step S114). Next, the photometric device 15 is driven to perform photometric operation to obtain exposure information (step S115). Then, the focal length detection circuit 9 acquires the focal length information f of the photographing lens barrel 6 (step S116).

The CPU 20 acquires the parallax correction amount P on the basis of the acquired shooting distance information x and the focal length information f in the same manner as in the first embodiment described above (step S117). Then, based on the parallax correction P (f, x), the parallax correction finder optical system 3 is driven by the drive circuit 4, and the parallax correction finder optical system 3 reaches the correction amount P. If so, the driving stops (step S118).

8 is a block diagram showing the configuration of a camera according to a fourth embodiment of the present invention, in which portions identical to those in FIG. 1 are denoted by the same reference numerals.

The feature of this fourth embodiment is a configuration in which the focus lens 16 is manually adjusted, and the photographing distance information x uses the photographing distance information detecting circuit 17 to position the focus lens 16. It can be obtained by detecting.

Next, the operation of the above configuration will be described according to a flowchart showing the operation of the CPU 20 shown in FIG.

In FIG. 9, the same step numbers are attached to the same steps as those in FIG.

When the photographer performs the first stroke of the shutter release button (not shown) and the switch SW1 is turned on (step S113), the CPU 20 obtains the shooting distance information x from the position of the focus lens 16 which has been manually adjusted. (Step S123). Next, the photometric device 15 is driven to perform photometric operation to obtain exposure information (step S115). Then, the focal length information f is obtained from the focal length detection circuit 9 (step S116), and the parallax correction amount P is calculated based on the focal length information f and the photographing distance information x (step S117). Then, based on the parallax correction amount P (f, x), the parallax correction finder optical system 3 is driven by the drive circuit 4, and when the parallax correction finder optical system 3 reaches the correction amount P, The driving is stopped (step S118).

As described above, since the focus operation is performed manually, in the fourth embodiment, the first point is that the photographing distance information x is acquired from the position of the focus lens 16 without performing the ranging operation. It is different from embodiment.

FIG. 10 is a flowchart showing the operation of the CPU 20 of the camera of FIG. 1 according to the fifth embodiment of the present invention. In FIG. 10, the same steps are attached to the same steps as in FIG. .

The fifth embodiment is characterized in that the parallax correction is performed in accordance with the operation of the shutter release button in each of the above embodiments. However, in the present embodiment, the zoom operation of the photographing optical system is completed even if the shutter release button is not operated. Therefore, parallax correction is performed automatically.

In the flowchart of FIG. 10, when the zoom operation is finished in step S106 or step S112, the flow proceeds directly to step S124 to obtain the focal length information f from the focal length detection circuit 9, and to drive the rangefinder 5 to determine the distance. The operation is performed to obtain shooting distance information x (step S114).

Next, the parallax correction amount P is calculated based on the focal length information f and the shooting distance information x (step S117). Then, the parallax correction finder optical system 3 is driven by the drive circuit 4 based on the parallax correction amount F (f, x), and when the parallax correction finder optical system 3 reaches the correction amount P, the parallax correction finder optical system 3 reaches the correction amount P. The drive is stopped (step S118).

According to the fifth embodiment, since parallax correction is automatically performed at the end of the zoom operation of the photographing optical system even when the shutter release button is not operated, even when the shutter release button is not operated, for example, when determining the composition. Since the parallax correction of the finder can always be performed appropriately, and the parallax correction is performed before the release operation for shooting, the shutter release time lag can be reduced.

According to each of the above embodiments, since the finder optical systems for zooming and parallax correction are formed and driven independently of each other, the optimum parallax correction for both the change in the focal length and the change in the shooting distance is achieved. It became possible to do this.

In addition, since the mechanical linkage between the driving mechanism of the zoom finder optical system and the shift-type finder optical system for parallax correction is not necessary, the configuration can be greatly simplified. In other words, as the compact camera of the root is further downsized, the constraints on the design layout are also increased. However, according to the above-described embodiments, the degree of freedom of the layout and design of the finder optical system is greatly increased. This is big. In addition, since parallax correction can be performed independently, it becomes possible to perform selective control not to drive in the situation where it is not desired to waste the driving time.

In the drawings, each component shown in schematic or block form is well known in camera technology, and their specific structure and operation are not new to the operation or the best mode for carrying out the invention.

While the invention has been described in terms of preferred embodiments, it should be understood that it is not limited to the embodiments described. Rather, the present invention is intended to cover such modifications as would vary from within the spirit and scope of the appended claims. The following claims are to be accorded the broadest interpretation so as to encompass all such modifications, equivalent constructions and functions.

For example, in the above embodiment, the parallax correction of the finder device is to change the view direction of the finder. However, the present invention is applicable even if the parallax correction is performed by another method such as changing the view frame. It can be.

In the above embodiment, the rapid shooting mode is a continuous shooting mode, but the present invention is not limited thereto, and other rapid shooting modes such as a rapid shooting mode in which the focusing of the photographing lens is adjusted in advance, or another shooting mode. Also in this invention, this invention is applicable.

In the above embodiment, the parallax correction operation is prohibited in the case of a specific condition such as a rapid shooting mode or a short focal length state, but this is, for example, even when the shutter release button is used in the case of the specific condition. When the operation is performed, the present invention can be applied not to prohibit the parallax correction operation completely, such as stopping the parallax correction operation or performing the parallax correction operation to some extent.

The present invention can be applied to shutter release members other than the shutter release buttons and buttons of the above embodiments.

In the above embodiment, a zoom type that can set the focal length continuously is assumed, but the present invention can be similarly applied to at least one of the photographing optical system and the finder optical system discontinuously switching the focal length.

In addition, the soft structure and hard structure of the above embodiment can be substituted suitably.

In addition, the present invention may include the above-described embodiments or their description elements as necessary.

In addition, in the present invention, all or part of the structure of claims or embodiments may form one device, or may be combined with another device, or may be an element constituting the device. .

The present invention also provides various types of cameras such as a lens shutter camera, a video camera, or an optical device or other device other than the camera, or a device applied to the camera or optical device or other device, or a component constituting the same. It is also applicable to.

According to the embodiment described above, optimal parallax correction can be performed in consideration of both the photographing distance and the focal length of the photographing lens without complicating the finder mechanism.

Also, if you are shooting when you don't want to spend time on parallax correction, or if you are shooting under the condition that shooting is important, under shooting conditions where parallax can be almost ignored, and shooting that requires parallax correction Photographing can be performed according to the condition.

Claims (24)

a) a parallax correction device for correcting the parallax of the finder; b) a focal length changing device for changing the finder; c) calculating the parallax correction signal based on the focal length and the focal length of the imaging optical system and controlling the parallax correction device according to the parallax correction signal, and according to the focal length of the imaging optical system And a control device for controlling the operation and regulating the operation of the parallax correction device while allowing the operation of the focal length changing device. a) a parallax correction device for correcting the parallax of the finder; b) calculating a parallax correction signal based on a focal length and a focal length of an imaging optical system and controlling the parallax correction device according to the parallax correction signal, and according to the selection of a predetermined shooting mode, the parallax correction device A parallax correction device for a finder, comprising a control device for regulating the control. a) a parallax correction device for correcting the parallax of the finder; b) a control device for controlling the parallax correction signal by calculating a parallax correction signal based on a focal length and a focal length of an imaging optical system and regulating the parallax correction device in accordance with a selection of a predetermined mode. Parallax correction device for a finder. a) a parallax correction device for correcting the parallax of the finder; b) a shooting mode selection device for selecting a speed shooting mode; c) calculating a parallax correction signal based on a focal length and a focal length of an imaging optical system and controlling the parallax correction device according to the parallax correction signal, and controlling the parallax correction device according to the rapid shooting mode selected by the photographing mode select device. Therefore, a parallax correction device for a finder comprising a control device for regulating the parallax correction device. a) a parallax correction device for correcting the parallax of the finder; b) calculating the parallax correction signal based on the focal length and the focal length of the imaging optical system to control the parallax correction device according to the parallax correction signal, and the combination of the focal length and the focal length of the imaging optical system is predetermined. And a control device for regulating the parallax correction device in the case of a combination thereof. a) a parallax correction device for correcting the parallax of the finder; b) calculating the parallax correction signal based on the focal length and the focal length of the imaging optical system and controlling the parallax correction device according to the parallax correction signal, and controlling the parallax correction device according to the operation of the shutter release member. A parallax correction device for a finder, comprising a control device for starting the operation. a) a parallax correction device for correcting the parallax of the finder; b) calculating the parallax correction signal based on the focal length and the focal length of the imaging optical system and controlling the parallax correction device according to the parallax correction signal, and operating the parallax according to the first stroke operation of the shutter release member. A parallax correction device for a finder, comprising a control device for starting the operation of the correction device. a) a parallax correction device for correcting the parallax of the finder; b) The parallax correction signal is calculated based on the focal length and the focal length of the imaging optical system, and the parallax correction device is controlled according to the parallax correction signal, and the end of the operation of changing the focal length of the imaging optical system is completed. And a control device for starting the operation of said parallax correction device. a) a parallax correction device for correcting the parallax of the finder; b) a focal length changing device for changing the finder; c) calculating a parallax correction signal based on the focal length and focal length of the imaging optical system to control the parallax correction device for controlling the focal length changing device according to the focal length of the imaging optical system, and changing the focal length And a control device that permits the operation of the device while regulating the operation of the parallax correction device. a) a parallax correction device for correcting the parallax of the finder; b) calculating a parallax correction signal based on a focal length and a focal length of an imaging optical system and controlling the parallax correction device according to the parallax correction signal, and according to the selection of a predetermined shooting mode, the parallax correction device Optical device comprising a control device for regulating the. a) a parallax correction device for correcting the parallax of the finder; b) controlling the parallax correction signal by calculating a parallax correction signal based on the focal length and the focal length of the imaging optical system, and having a control device for regulating the parallax correction device according to the selection of a predetermined mode. Optical device, characterized in that. a) a parallax correction device for correcting the parallax of the finder; b) a shooting mode selection device for selecting a rapid shooting mode; c) calculating a parallax correction signal based on a focal length and a focal length of an imaging optical system and controlling the parallax correction device according to the parallax correction signal, and according to the rapid shooting mode selected by the photographing mode selection device. And a control device for regulating the parallax correction device. a) a parallax correction device for correcting the parallax of the finder; b) calculating the parallax correction signal based on the focal length and focal length of the imaging optical system and controlling the parallax correction device according to the parallax correction signal, and the combination of the focal length and the focal length of the imaging optical system is determined. And a control device for regulating the parallax correction device in the case of a combination of the two. a) a parallax correction device for correcting the parallax of the finder; b) calculating the parallax correction signal based on the focal length and the focal length of the imaging optical system and controlling the parallax correction device according to the parallax correction signal and operating the parallax correction device according to the operation of the shutter release member. Optical device comprising a control device for starting the. a) a parallax correction device for correcting the parallax of the finder; b) calculating the parallax correction signal based on the focal length and the focal length of the imaging optical system and controlling the parallax correction device according to the parallax correction signal, and operating the parallax according to the first stroke operation of the shutter release member. And a control device for starting the operation of the correction device. a) a parallax correction device for correcting the parallax of the finder; b) The parallax correction signal is calculated based on the focal length and the focal length of the imaging optical system, and the parallax correction device is controlled according to the parallax correction signal, and the end of the operation of changing the focal length of the imaging optical system is completed. And a control device for starting the operation of the parallax correction device. a) a parallax correction device for correcting the parallax of the finder; b) a focal length changing device for changing the finder; c) calculating a parallax correction signal based on a focal length and a focal length of the imaging optical system to control the focal length changing device according to the focal length of the imaging optical system, to control the parallax correction device, and to change the focal length change And a control device which permits operation of the device and initiates operation of the parallax correction device. a) a parallax correction device for correcting the parallax of the finder; b) calculating a parallax correction signal based on a focal length and a focal length of an imaging optical system and controlling the parallax correction device according to the parallax correction signal, and according to the selection of a predetermined shooting mode, the parallax correction device Camera comprising a control device for regulating the. a) a parallax correction device for correcting the parallax of the finder; b) a control device for controlling the parallax correction signal by calculating a parallax correction signal based on a focal length and a focal length of an imaging optical system and regulating the parallax correction device in accordance with a selection of a predetermined mode. Camera characterized in that. a) a parallax correction device for correcting the parallax of the finder; b) a shooting mode selection device for selecting a speed shooting mode; c) calculating a parallax correction signal based on a focal length and a focal length of an imaging optical system and controlling the parallax correction device according to the parallax correction signal, and according to the rapid shooting mode selected by the photographing mode selection device. And a control device for regulating the parallax correction device. a) a parallax correction device for correcting the parallax of the finder; b) calculating the parallax correction signal based on the focal length and the focal length of the imaging optical system to control the parallax correction device according to the parallax correction signal, and the combination of the focal length and the focal length of the imaging optical system is predetermined. And a control device for regulating the parallax correction device in the case of a combination of the two. a) a parallax correction device for correcting the parallax of the finder; b) calculating the parallax correction signal based on the focal length and the focal length of the imaging optical system and controlling the parallax correction device according to the parallax correction signal, and controlling the parallax correction device according to the operation of the shutter release member. And a control device for starting the operation. a) a parallax correction device for correcting the parallax of the finder; b) calculating the parallax correction signal based on the focal length and the focal length of the imaging optical system and controlling the parallax correction device according to the parallax correction signal, and operating the parallax according to the first stroke operation of the shutter release member. And a control device for starting the operation of the correction device. a) a parallax correction device for correcting the parallax of the finder; b) The parallax correction signal is calculated based on the focal length and the focal length of the imaging optical system, and the parallax correction device is controlled according to the parallax correction signal, and the end of the operation of changing the focal length of the imaging optical system is completed. And a control device for starting the operation of the parallax correction device.

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