JPH08160501A - Finder device for camera - Google Patents

Abstract

PURPOSE: To provide a finder device for a camera capable of quickly adjusting a deviation in the visibility of a finder caused by a subject distance, without giving an unpleasant feeling. CONSTITUTION: In the finder device provided with a finder automatic focusing optical system (FAF optical system) 1b and a finder zooming optical system (F zooming optical system) 1a in the optical path of the finder device, the power of the F zooming optical system 1a is detected by a finder controller (F controller) 3 and the FAF optical system 1b is controlled by the F controller 3 in accordance with a single range-finding output selected from plural range-finding points including the central part of a picture frame and the power, to focus a photographic optical system 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finder device for a camera having a finder diopter adjustment function.

[0002]

2. Description of the Related Art Conventionally, a viewfinder of a compact camera or the like is usually a see-through finder, and even a viewfinder that is not see-through is often constructed with a fixed focus.
However, in recent years, the finder has become higher in magnification as the photographing magnification increases.

For this reason, the diopter of the finder exceeds the limit of the accommodation ability of human eyes having good eyesight depending on the distance to the subject. That is, it exceeds the range in which the proper diopter of the viewfinder can be adjusted.

If an attempt is made to address this problem optically, the size of the device will increase and the cost will increase, making the product unfit for use. As a countermeasure against this, a technique of driving the optical system of the finder to adjust the diopter of the finder is considered, and various proposals have been made. For example, a technique for driving an optical system of a finder to a predetermined position by distance measurement information of a camera or a mode (macro) of a camera is disclosed in JP-A-2-230226 and JP-A-3-81748. There is.

The proposal by the above-mentioned Japanese Patent Laid-Open No. 230230/1990 adjusts the diopter of the finder by driving the focus section of the finder system based on the output signal from the focus detection means provided in a part of the camera. The finder image can be observed in a good condition over the entire object distance.

Further, according to the proposal by the above-mentioned Japanese Patent Laid-Open No. 3-81748, when the camera has an automatic focusing mechanism, the proximity mode switch of the camera is operated in response to a detection signal from the automatic focusing mechanism. If this is the case,
(EN) A finder that corrects diopter by operating a finder lens driving device to displace a lens group of an objective system. Further, in recent years, as for a distance measuring method of a camera, in general, in order to improve a focusing rate, multi distance measuring for measuring a plurality of points is performed.

[0007]

However, the above-mentioned JP-A-2-230226 and JP-A-3-8174.
The technique listed in Japanese Patent No. 8 cannot solve the problems listed below.

First, the current cameras mainly use multi-range distance measuring for measuring a plurality of points. When a part of the finder optical system is moved by using a normal distance measuring result, the finder itself becomes difficult to see. Become. Furthermore, if distance measurement at multiple points was performed normally, it would take a long time from the start of distance measurement until the viewfinder looks good, which is not suitable for viewfinder diopter adjustment to determine composition. Become. Furthermore, in order to drive the finder optical system, when the selected distance measurement information is for an unintended subject, the unsightly appearance becomes noticeable. Further, if the drive amount of the finder optical system is large, the photographer may feel uncomfortable.

Further, the finder has a strong relation with the composition because it is used for determining the composition, but has a weak relation with the appearance of the photograph because it has no aperture and shutter. That is, it is convenient for the finder to be entirely visible.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a finder device for a camera capable of quickly adjusting the deviation of the diopter of the finder due to the distance of the subject without causing any discomfort. And

[0011]

In order to achieve the above object, a finder device for a camera according to claim 1 is a finder device having a focusing optical system and a zoom optical system in its optical path. Magnification detection means for detecting the magnification of the optical system, and a single distance-measuring output selected from a plurality of distance-measuring points including the center of the screen for adjusting the focus of the photographing lens and the magnification. And finder control means for controlling the focusing optical system.

Further, in the finder device for a camera according to a second aspect, the finder control means adjusts the focusing optical system according to a value obtained by dividing the square of the magnification of the zoom optical system by the object distance. The feature is that the position is set discretely.

A finder device for a camera according to a third aspect is a finder device having a focusing optical system and a zoom optical system in its optical path, and a magnification detecting means for detecting a magnification of the zoom optical system, A first distance measuring unit for adjusting the focus of the photographing lens, capable of measuring a plurality of predetermined points including the central portion of the photographing screen, and the first distance measuring unit only near the central portion of the photographing screen. According to the output from the first and second distance measuring means, and the output from the magnification detecting means, the finder device is combined according to the second distance measuring means for measuring the distance wider than the detection point in the central portion. And a finder control means for driving the focusing optical system.

[0014]

The distance measuring device of the camera according to the present invention is a finder device having a focusing optical system and a zoom optical system in its optical path, and the magnification of the zoom optical system is detected by the magnification detecting means to take a picture. The focusing optical system is controlled by the finder control means in accordance with a single distance measurement output selected from a plurality of distance measurement points including the center of the screen for focus adjustment of the lens and the magnification. It

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a finder device for a camera according to a first embodiment of the present invention.

In this finder device, the finder zoom optical system (hereinafter referred to as F zoom optical system) 1a and the finder automatic focusing optical system (hereinafter referred to as FAF optical system) 1b in the finder optical system 1 can be automatically driven. It has become a system.

The finder optical system 1 is an F zoom optical system 1a.
And an FAF optical system 1b and an index display section arranged near the primary image plane 1c. The F zoom optical system 1a and the FAF optical system 1b are connected to a finder driving device (hereinafter referred to as an F driving device) 2. Further, the F drive device 2 is connected to a finder control device (hereinafter referred to as F control device) 3.

A start switch (start SW) 3a, an F zoom optical system 1a, a multi-distance measuring device 4, and a photographing optical system driving device 5 are connected to the F control device 3. Further, the photographing optical system driving device 5 includes the photographing optical system 6
Connected to.

The viewfinder optical system 1 may be provided with a switching unit 1d for switching between driving the F zoom optical system 1a and the FAF optical system 1b. Next, the operation of the viewfinder device of the camera of the first embodiment will be described.

The finder optical system 1 is an optical system that guides an external image to the photographer's eyes. The F-zoom optical system 1a changes the magnification of the subject image, and the FAF optical system 1b changes the focus position of the subject image to 1. It is set at the position of the next image plane 1c.

When the F control device 3 receives the signal from the start switch 3a, it reads the zoom information of the F zoom optical system 1a and controls and drives the multi-distance measuring device 4 to obtain the distance measurement information of one point.

Next, the F control device 3 outputs a control signal to the F drive device 2 based on the distance measurement information. The F drive device 2 receives the F signal from the F control device 3 in response to the control signal.
The zoom optical system 1a and the FAF optical system 1b are driven.

Further, the F control device 3 is a multi-distance measuring device 4
A control signal is output to the photographing optical system driving device 5 on the basis of the multi-distance measurement information from. This photographing optical system driving device 5
Drives the photographing optical system 6 by the control signal.

FIG. 2 is a flow chart showing the sequence of the F control device 3 as the operation of the camera when the viewfinder device of the first embodiment is applied to the camera. When the camera starts the sequence (step S1), as initialization, the camera is in a photographing state, and in the finder device, the FAF optical system 1b is in a driving state.

Next, the F drive device 3 determines whether or not a first release switch (1stR) (not shown) is on (step S3). Here, if the first release switch is not turned on, the process branches to step S12 to end this sequence. On the other hand, if the first release switch is on, the process proceeds to step S4.

In step S4, the central distance measurement is performed by the multi distance measuring device 4, and the distance measurement information is set to Lc. Then, in step S4, from the distance measurement information Lc obtained,
The drive position Ld of the FAF optical system 1b is calculated (step S5). Then, in step S5, the FAF optical system 1b is driven based on the value of the drive position Ld thus obtained (step S6).

Next, the multi-distance measuring device 4 measures the distance other than the center point (step S7), and the driving position of the photographing optical system 6 is calculated from the distance measurement information (step S8).
Next, it is again determined whether the first release switch is on (step S9). Here, if the first release switch is not turned on, the process branches to step S12 to end this sequence. On the other hand, if the first release switch is on, the process proceeds to step S10.

In step S10, it is determined whether or not a second release switch (not shown) is on. Here, if the second release switch is not on, step S
Return to 9. On the other hand, when the second release switch is on, the camera performs a known shooting sequence (step S11). Then, this sequence ends (step S12).

Although the finder optical system 1 is driven by the motor, the F-zoom optical system 1a may be driven by the cam in conjunction with the photographing optical system 6. Further, the driving of the FAF optical system 1b in the finder optical system 1 may be performed by combining the driving of the mechanical holding member (including the magnet) and the spring.

Further, in step S4, the distance measurement is performed at one point in the center, but the number of distance measurement points is not limited to one as long as it is less than the distance measurement points of the normal multi distance measurement. Further, the distance measurement may be performed at the same number of distance measurement points as in the multi distance measurement at the same time, instead of dividing the distance measurement into the multi distance measurement, to speed up the distance measurement for each point.

FIG. 3 shows the FA in the finder optical system 1 at step S5 in the flow chart shown in FIG.
It is a flowchart which shows the sequence which calculates the drive position of F optical system 1b.

This is based on the distance measurement information Lc detected at the center by the multi-distance measuring device 4 based on the FAF optical system 1b.
Is to determine the drive position of. When the calculation of the drive position of the FAF optical system 1b is started (step S11), the following processing is performed based on the distance measurement information Lc obtained by the multi distance measuring device 4 at the center.

First, it is determined whether or not the distance measurement information Lc is larger than Lf (step S12). Here, the distance measurement information L
If c is larger than Lf, the process branches to step S14, the drive position Ld is set to L0, and the process proceeds to step S17.
On the other hand, when the distance measurement information Lc is not larger than Lf, the process proceeds to step S13.

In step S13, the distance measurement information Lc is Ln.
Determine if greater than. If the distance measurement information Lc is larger than Ln, the process proceeds to step S15, the drive position Ld is set to L1, and the process proceeds to step S17. On the other hand, if the distance measurement information Lc is not larger than Ln, the process branches to step S16, the drive position Ld is set to L2, and the process proceeds to step S17. In step S17, this sequence is exited.

The Lf and Ln are predetermined determination distances, and L0, L1 and L2 are predetermined setting positions of the FAF optical system 1b. Next, the finder device of the camera of the modified example of the first embodiment will be described.

FIG. 4 is a diagram showing the operation of the camera when the viewfinder device of the modification of the first embodiment is applied to the camera.
6 is a flowchart showing a sequence of the control device 3.
The configuration of this modification is the same as that of the first embodiment, and therefore, the description thereof is omitted here.

The camera starts the sequence (step S
21) Then, as initialization, the camera is in the photographing state and the finder device is in the driving state of the FAF optical system 1b. Further, the timer t = 0 is set and the timer t is started (step S22).

Next, the F control device 3 determines whether or not the start switch (start SW) 3a is on (step S23). The start switch 3a is disclosed in
It is an eyepiece detection mechanism of a camera disclosed in Japanese Laid-Open Patent Publication No. -56935, and a contact sensor as shown in FIG. 8 described later is used for a release mechanism. Here, start switch 3
If a is not on, the process branches to step S34 to end this sequence.

On the other hand, when the start switch 3a is turned on, the process shifts to step S24, the simple distance measurement is performed by the multi distance measuring device 4 at one point in the center, and the distance measurement information is set to Lec.
Then, in step S24, the distance measurement information Le obtained is obtained.
The drive position Ld of the FAF optical system 1b is calculated from c (step S25). Then, in step S25, the FAF optical system 1b is driven based on the value of the drive position Ld thus obtained (step S26).

Next, it is determined whether or not a first release switch (1stR) (not shown) is on (step S2).
7). Here, if the first release switch is not turned on, the process proceeds to step S28, and it is determined whether or not the timer t = T. When the timer t = T, the timer t = 0 is set and the process returns to step S23. If the timer t = T is not satisfied, the process returns to step S27 and it is determined again whether or not the fast release switch is on. On the other hand, step S2
If the first release switch is turned on in step 7, the process branches to step S29. That is, in steps S27 and S28, the process branches to step S29 only when the first release switch is turned on while the predetermined time T has elapsed. On the other hand, when the first release switch is not turned on, the timer t = 0 is set and the process returns to step S23.

In step S29, multi-distance measurement including the center point is performed by the multi-distance measuring device 4, and the driving position of the photographing optical system 6 is calculated from the distance measurement information (step S3).
0).

Next, it is again determined whether or not the first release switch is on (step S31). here,
If the first release switch is not on, the timer t = 0 is set and the process returns to step S23. On the other hand, if the first release switch is on, the process proceeds to step S32.

In step S32, it is determined whether or not a second release switch (not shown) is on. Here, if the second release switch is not on, step S
Return to 31. On the other hand, if the second release switch is on, the camera performs a known shooting sequence (step S33). Then, this sequence ends (step S34).

Although the finder optical system 1 is driven by a motor, the F-zoom optical system 1a may also be driven by the cam in conjunction with the photographing optical system 6. Further, the driving of the FAF optical system 1b in the finder optical system 1 may be performed by combining the driving of the mechanical holding member (including the magnet) and the spring.

Further, in step S24, the distance measurement is performed at one point in the center, but the number of distance measurement points is smaller than the distance measurement points of the normal multi-range distance measurement, and if it is fast and simple, it is not one point. Is also good.

FIG. 5 shows the F in the finder optical system 1 at step S25 in the flow chart shown in FIG.
It is a flow chart which shows the sequence which calculates the drive position of AF optical system 1b.

This is to convert the zoom magnification of the F-zoom optical system 1a and the distance measurement information Lec of the multi-distance measuring device 4 into information about diopter, and set the drive position block according to the value. .

When the calculation of the drive position of the FAF optical system 1b is started (step S41), the information Li concerning the diopter is calculated by the following formula (step S42). Li = (magnification) ² / Lec (1) Then, according to the information Li calculated from the equation (1),
The block at the corresponding position of the FAF optical system 1b is set (step S43). Then, according to the above block, F
The drive position Ld of the AF optical system 1b is determined (step S
44). Then, this sequence is exited (step S4
5).

As will be described later, the block is divided into three in this modification, but the number of blocks may be any number as long as it is one or more. Further, in the above formula (1), the information Li may be calculated only by the distance (distance measurement information) without using the magnification, and the corresponding block may be set.

FIG. 6 shows the information Li and the FAF optical system 1b.
It is a figure which shows the relationship with the block of the position of. From the detected distance information, it is shown in the above equation (1) (magnification squared).
Information Li is calculated by / (detection distance), and this information Li is converted into a block at the position of the FAF optical system 1b. The closer the detection distance is, the larger the block value is, and the larger the magnification is, the larger the block value is.

Regarding the division of the above block, 1
It is good to divide by a unit between ~ 4 diopters. Further, the block value may be changed by an external setting, for example, a change of ROM, an external switch, communication, or an IC card.

FIG. 7 is a diagram showing an example of the difference in the light emission pattern between the normal distance measurement and the simple distance measurement. In order to improve accuracy, the normal multi-range distance measurement of one point is performed as shown in FIG.
Distance measurement information is obtained by intermittent light emission and light reception as shown in FIG.

However, the time is important for the distance measurement of one point of the simple distance measurement according to the present modification of the first embodiment.
As shown in (b), speeding up is realized by reducing the number of times of light emission and light reception.

FIG. 8 is an example showing the structure of the start switch 3a in the first embodiment and the modification. A capacitive touch sensor 7 having a mechanism for detecting whether or not a finger touches the release switch is arranged on the surface of the release switch. Others are usually the first release switch (1stR) as well as the known release switch.
8 and a second release switch (2ndR) 9 has a switch structure.

When the section 8a contacts the section 8b, the first release switch 8 is turned on, and when the section 9a contacts the section 9b, the second release switch 9 is turned on.

FIG. 9 shows the FAF optical system 1 in the case where the above-mentioned simple distance measurement is performed at a plurality of distance measuring points which is smaller than the normal multi distance measuring.
It is a flowchart which shows the sequence which calculates the drive position of b.

The zoom magnification of the F-zoom optical system 1a and the distance measurement information Lec of the multi-distance measuring device 4 are converted into information relating to diopter, and the maximum value (hereinafter referred to as MAX) and the minimum value (hereinafter referred to as MAX) of the plurality of blocks are converted. A method of setting a drive position block according to a block within the range of (MIN) will be described. When the calculation of the drive position of the FAF optical system 1b is started (step S51), the information Lj on the diopter is calculated by the following formula (step S52).

[0058]

[Equation 1]

Here, j is a variable and corresponds to a plurality of distance measuring points. Subsequently, the information Lj obtained by the above equation (2) is converted into a block at the position of the FAF optical system 1b corresponding to this information Lj (step S53).

Next, in step S53, the MAX and MIN blocks are detected from the converted blocks (step S54). Subsequently, it is determined whether the relationship between the blocks of MAX and MIN, that is, whether or not the block exists within the range of MAX and MIN (step S5).
5). If there is no block within the range of MAX and MIN, the process branches to step S57 to select MAX, which is the block with the closer distance measurement information, and step S58.
Move to.

On the other hand, when there is a block within the range of MAX and MIN, the process proceeds to step S56 and MAX and M
A block (interior division block) corresponding to the middle of IN is selected, and the process proceeds to step S58. This step S
At 56, when the block corresponding to the middle is selected, MAX
Select a block that internally divides between MIN and MIN into m: n,
Here, when n = m, a block that is (MAX + MIN) / 2 or MAX that is the closest block may be selected.

Then, the drive position Ld of the FAF optical system 1b is determined according to the block (step S58).
Then, the process exits this sequence (step S59). Note that the block is divided into three in this modification, but the number of blocks may be any number as long as it is one or more. Also,
In the equation (2), the information Lj may be calculated only by the distance (distance measurement information) without using the magnification, and the corresponding block may be set.

Further, when there is no block within the range of MAX and MIN, the block may not be moved or selected to prevent overshooting. Further, when there are a plurality of blocks within the range of MAX and MIN, it is advisable to select the block on the closest side, that is, the block on the MAX side.

When a decimal point is generated by detecting a block corresponding to the middle, it is preferable to round up the decimal point to determine the block. For example, when MAX = 7 and MIN = 2 (condition: m = n), the detection point is 4.5, and the set position is the block of 5. It should be noted that this is moved up to the closer side in the distance measurement information (distance).

Alternatively, the internal division point may be obtained first from the value relating to the diopter, and then the block may be selected. Next, a finder device for a camera according to a second embodiment of the present invention will be described.

FIG. 10 is a block diagram showing the structure of a finder device for a camera according to the second embodiment of the present invention. The finder optical system 1 is composed of an F-zoom optical system 1a, an FAF optical system 1b, and an index display section arranged near the primary imaging plane 1c. The F zoom optical system 1a and the FAF optical system 1
b is connected to the F drive device 2. Further, the F drive device 2 is connected to the F control device 3.

A start switch (start SW) 3a, an F zoom optical system 1a, a multi distance measuring device 4, a photographing optical system driving device 5, and a simple distance measuring device 10 are connected to the F control device 3. To be done. Further, the photographing optical system driving device 5 is connected to the photographing optical system 6.

For the distance measurement by the simple distance measuring device 10, known ultrasonic distance measurement or active distance measurement in which the size of the spot diameter of the distance measurement point is larger than the spot diameter of one point of the normal multi distance measurement is used. To use.

The finder optical system 1 may be provided with a switching unit 1d for switching between driving the F zoom optical system 1a and the FAF optical system 1b. Next, the operation of the viewfinder device of the camera of the second embodiment will be described.

The finder optical system 1 is an optical system for guiding an external image to the photographer's eyes. The F-zoom optical system 1a changes the magnification of the subject image, and the FAF optical system 1b changes the subject image forming position to 1. It is set at the position of the next image plane 1c.

When the F control device 3 receives the signal from the start switch 3a, it reads the zoom information of the F zoom optical system 1a and controls and drives the simple distance measuring device 4 to obtain the distance measuring information.

Next, the F control device 3 outputs a control signal to the F drive device 2 based on the distance measurement information. The F drive device 2 receives the F signal from the F control device 3 in response to the control signal.
The zoom optical system 1a and the FAF optical system 1b are driven.

Further, the F control device 3 is a multi-range finding device 4
A control signal is output to the photographing optical system driving device 5 on the basis of the multi-distance measurement information from. This photographing optical system driving device 5
Drives the photographing optical system 6 by the control signal.

FIG. 11 is a flowchart showing the sequence of the F control device 3 as the operation of the camera when the finder device of the second embodiment is applied to the camera. When the camera starts the sequence (step S61), as initialization, the camera is in a shooting state and the finder device is in a driving state of the FAF optical system 1b. Further, the timer t = 0 is set and the timer t is started (step S62).

Next, the F control device 3 determines whether or not the start switch (start SW) 3a is on (step S63). The start switch 3a is disclosed in
It is an eyepiece detection mechanism of a camera disclosed in Japanese Patent Publication No. -56935, and the contact sensor as shown in FIG. 8 described above is used for the release mechanism. Here, start switch 3
If a is not on, the process branches to step S74 to end this sequence.

On the other hand, when the start switch 3a is on, the process proceeds to step S64, the simple distance measuring device 10 performs the simple distance measuring, and the distance measuring information is set to Lec. continue,
From the distance measurement information Lec obtained in step S64,
The drive position Ld of the FAF optical system 1b is calculated (step S65). Then, in step S65, the FAF optical system 1b is driven based on the value of the drive position Ld thus obtained (step S66).

Next, the first release switch (1s
It is determined whether or not (tR) is on (step S67). Here, if the first release switch is not on, the process proceeds to step S68, and the timer t is set to the predetermined time T.
It is determined whether or not the same. When the timer t becomes equal to the predetermined time T, the timer t = 0 is set and the process returns to step S63. If the timer t is not equal to the predetermined time T, the process returns to step S67 to determine again whether the first release switch is on. On the other hand, if the first release switch is turned on in step S67, the process branches to step S69. That is, in steps S67 and 68, if the first release switch is turned on during the elapse of the predetermined time T, the process branches to step S69. On the other hand, if the first release switch has not been turned on, the timer t = 0 is set and the process returns to step S63.

In step S69, multi-distance measurement is performed by the multi-distance measuring device 4, and the drive position of the photographing optical system 6 is calculated from the distance measurement information (step S70). next,
It is again determined whether the first release switch is on (step S71). If the first release switch is not on, the timer t = 0 is set and the process returns to step S63. On the other hand, if the first release switch is on, the process proceeds to step S72.

In step S72, it is determined whether or not the second release switch is on. Here, if the second release switch is not turned on, the process returns to step S71. On the other hand, if the second release switch is on,
A known photographing sequence is performed in the camera (step S73). Then, this sequence ends (step S74).

Although the drive in the finder optical system 1 is performed by the motor, the zoom drive of the F zoom optical system 1a may be performed in conjunction with the photographing optical system 6 by a cam or the like. Further, the driving of the FAF optical system 1b in the finder optical system 1 may be performed by combining the driving of the mechanical holding member (including the magnet) and the spring.

In the first and second embodiments,
As shown in FIGS. 1 and 10, the FAF optical system 1b may be arranged in front of the primary imaging plane 1c, and FIG.
As shown in (a), the FAF optical system 1b is connected to the primary image plane 1
It may be placed behind c.

As shown in FIG. 12B, in the first and second embodiments, a finder diopter optical system (hereinafter referred to as F diopter optical system) 1e is provided behind the primary image plane 1c. The FAF optical system 1 has an automatic focus adjustment function by arranging
It may be divided into both the b and F diopter optical system 1e.
In this case, focus roughly with the FAF optical system 1b,
The F diopter optical system 1e is driven so as to focus in detail.

As described above, according to the first and second embodiments, the diopter shift due to the distance of the subject is not uncomfortable.
It is possible to provide a finder device that can be adjusted at high speed in terms of time.

Next, as a third embodiment, a case where the finder device according to the present invention is applied to a camera will be described.
In the third embodiment, the FAF optical system 11b and the F diopter optical system 11c, which are the optical systems having the automatic focus adjustment function of the finder device, are used as the simple distance measurement information for one central point in the multi-distance measurement by the multi-distance measuring device 14. The case of driving by will be described.

FIG. 13 is a diagram showing the structure of a finder device when the finder device of the third embodiment is applied to a camera. The finder optical system 11 includes an index arranged near the primary image forming surface 11d of the finder and the F-zoom optical system 1.
1a, FAF optical system 11b, F diopter optical system 11c,
It comprises a drive portion 11e for driving these optical systems and a switching portion 11f for switching the drive portion 11e.

The drive section 11e and the switching section 11f are connected to the CPU via a motor driver 12 for driving them.
(Central Processing Unit; CPU) 13 is connected.

Further, the CPU 13 includes a multi-rangefinder 14 for measuring a plurality of points of an object, an EEPROM 15, and
Zoom up switch of input switch group (Zoom UPS
W) 13a, zoom down switch (zoom DOWNS
W) 13b, mode selection switch (mode SW) 13
c, first release switch (1stR) 13d,
The second release switch (2ndR) 13e is connected.

Next, the operation of the viewfinder device of the camera of the third embodiment will be described. The CPU 13 drives the FAF optical system 11b in the finder optical system 11 through the motor driver 12, the driving portion 11e, and the switching portion 11f based on the simple distance measurement information of the multi-distance measuring device 14 to set a predetermined subject. An image is formed at a position (near the primary image forming surface 11d).

Further, the CPU 13 uses the finder optical system 1
By driving the F diopter optical system 11c in 1 through the motor driver 12, the driving portion 11e, and the switching portion 11f, the image of the subject is changed to an image having different diopter and transmitted to the photographer's eyes. The photographer inputs an image judged to be appropriate from images with different diopters into the CPU 13 using the input switch group of the camera or the like. The CPU 13 records the selected diopter information in the EEPROM 14. When selecting the diopter, each switch of the input switch group has a function of selecting the diopter.

FIG. 14 is an example of an external view of a camera when the finder device of the third embodiment is applied to the camera.
As shown in the figure, the camera includes a zoom up switch (zoom upSW) 13a, a zoom down switch (zoom downSW) 13b, a mode selection switch 13 (mode SW) c, and a first / second release switch (release). SWs 13d and 13e and a liquid crystal display device (display LCD) 16 are arranged.

In this camera, when the mode selection switch 13c is operated to change the mode to the diopter mode,
First / second release switch 13d, 13e
Has a diopter adjustment function. The mode selection switch 13c is used to set a mode relating to diopter and other modes of the camera. The information for these cameras is
By being displayed on the display LCD 16, it is confirmed by the photographer.

FIG. 15 shows a CPU as an operation of the camera when the finder apparatus of the third embodiment is applied to the camera.
It is a flowchart which shows the sequence of 13. When the camera starts the sequence (step S101), the flag MF = 0 and the flag F = 0 are set as initialization.
The information d on the diopter is defined as di. Furthermore, the timer t =
The timer t is set to 0 (step S10).
2). Note that di is information about the diopter of the individual photographer used last time. Then, the F diopter optical system 11c in the finder optical system 11 is set to the position based on the previous information di (step S103).

Next, the CPU 13 determines whether or not the diopter mode is selected (step S104). Here, if the diopter mode is selected, the process branches to step S117 to select a diopter submenu. The process of selecting this submenu will be described later. Subsequently, the CPU 13 determines whether or not the flag MF = 1 (step S118). This flag MF is a flag that becomes "1" only when personal information is set in the submenu selection process by the photographer used last time, and becomes "0" in other cases. Step S1
In step 18, if the flag MF = 0, step S104
Return to. On the other hand, if the flag MF = 1, step S1
Then, the process proceeds to step 19, the diopter is adjusted, and the process returns to step S104. The processing of this diopter adjustment will be described later.

When the diopter mode is not selected in step S104, the normal photographing sequence is started. First, the CPU 13 detects the states of the zoom-up / zoom-down switches (zoom SW) 13a and 13b and makes a determination (step S105). If the zoom-up / zoom-down switches 13a and 13b are on, the process branches to step S120 to set the zoom value (zoom setting), and the process returns to step S104. The process of setting the zoom value will be described later.

Next, it is determined whether or not a start switch (start SW) (not shown) is on (step S10).
6). Here, if the start switch is not on,
The process branches to step S123 to end this sequence. On the other hand, if the start switch is on, step S10
7, the process determines whether the flag F = 0. This flag F indicates that F
The AF optical system 11b is driven to indicate whether or not the setting of the finder optical system 11 is completed.
When 1b is driven and the setting is completed, it is set to "1", and when it is not driven and the setting is not completed, it is set to "0".

If the flag F = 0 is not satisfied, the process branches to step S111. On the other hand, in the case of the flag F = 0, the process proceeds to step S108 to perform simple distance measurement at one point in the center of the multi distance measuring device 14 and set the distance measurement information to Lec.
Then, in step S108, the distance measurement information L obtained is obtained.
The driving position Ld of the FAF optical system 11b is calculated from ec (step S109). Then, the above step S10
At 9, the FAF optical system 11b is driven based on the obtained drive position Ld value, the flag F is set to "1" (step S110), and the process proceeds to step S111.

In step S111, it is determined whether or not the first release switch (1stR) 13d is on. Here, if the first release switch 13d is on, the process proceeds to step S112. On the other hand, if the first release switch 13d is not turned on, the process proceeds to step S121, and it is determined whether the timer t = T. In addition, T is a predetermined time. When the timer t = T, the process proceeds to step S122, the timer t = 0 and the flag F = 0 are set, and the process returns to step S104. On the other hand, when the timer t = T is not satisfied, the process directly returns to step S104.

When the first release switch 13d is turned on in step S111, step S1
In 12, the multi-distance measuring device 14 performs multi-distance measurement including the center point, and the driving position of the photographing optical system is calculated from the distance measurement information (step S113).

Then, it is again determined whether or not the first release switch 13d is turned on (step S114).
If the first release switch 13d is not on, the process branches to step S122. On the other hand, if the first release switch 13d is on, the process proceeds to step S115.

In step S115, it is determined whether the second release switch 13e is on. Here, if the second release switch 13e is not turned on, the process returns to step S114. On the other hand, if the second release switch 13e is on, the camera performs a known shooting sequence (step S116). Then, this sequence ends (step S123).

Although the finder optical system 11 is driven by the motor, the F-zoom optical system 11a may be driven by the cam in conjunction with the photographing optical system. In addition, the FAF optical system 1 in the finder optical system 11
The drive of 1b may also be performed by combining the drive of a mechanical holding member (including a magnet) and a spring.

FIG. 16 is a flow chart showing the sequence of the diopter mode submenu selection in step S117 in the flow chart shown in FIG.
When submenu selection is started (step S131),
The menu is displayed on the display LCD 16 (step S1
32), depending on the selected S = 1 to 4 (step S1
33 to S137), the following processing is performed (step S13).
8 to S144).

When S = 1 is selected, as a standard, d
= -0.5 and MF = 0. When S = 2 is selected, as myopia, d = −2.0 and MF = 0.
When S = 3 is selected, hyperopia is d = +.
1.0 and MF = 0. Further, when S = 4 is selected, d0 = di and MF = 1 are set as individual settings.
After making the above settings, exit this sequence.

The value set here may be a value other than these, and the unit of d is diopter. FIG. 17
Is the step S in the flowchart shown in FIG.
11 is a flowchart showing a diopter adjustment sequence in 119.

In this diopter adjustment, the FAF optical system 1 in the finder optical system 11 is arranged so that the influence of the subject image is reduced.
1b and the zoom position of the F zoom optical system 11a are set to the wide side, and then the diopter is set by the photographer.

When the diopter adjustment is started (step S15)
1) As initialization, the information di concerning the previous diopter is set to the information d, and the functions of the zoom up switch 13a and the zoom down switch 13b are set to the F diopter optical system 1
It is changed to the operation of 1c (step S152).

Next, the switching section 11f is switched so as to drive the F zoom optical system 11a, and the F zoom optical system 11a is driven.
Is set to a predetermined position (wide side) with a small image magnification (step S153). Then, the multi-rangefinder 1
In step 4, the normal central one-point distance measurement is performed to obtain distance measurement information (step S154). The switching unit 11f is switched so as to drive the FAF optical system 11b, and the FAF optical system 11b is driven based on the distance measurement information (step S15).
5).

Next, the switching portion 11f is switched so as to drive the F diopter optical system 11c, and the zoom-up switch 1
It is determined whether or not 3a is turned on (step S156). Here, if the zoom-up switch 13a is on, the process proceeds to step S161, and the F diopter optical system 11c is set to the diopter +
The driving is performed by a predetermined amount to the side, and the process proceeds to step S158.

On the other hand, if the zoom-up switch 13a is not on, the process proceeds to step S157, and it is determined whether or not the zoom-down switch 13b is on. If the zoom-down switch 13b is turned on, step S
The flow branches to 162, the F diopter optical system 11c is driven toward the diopter minus side by a predetermined amount, and the process proceeds to step S158. On the other hand, when the zoom down switch 13b is not on, the process directly proceeds to step S158.

In step S158, it is determined whether the mode has ended. If the mode has not ended, the process returns to step S156. On the other hand, in the case of ending the mode, the process proceeds to step S159, and the information d on the diopter is recorded in the information di.

Next, the following processing for restoring the function set for the diopter mode is performed. The switching unit 11f is set to drive the FAF optical system 11b, and the zoom-up switch 13a and the zoom-down switch 13b are changed for zoom value setting (step S160). Then, this sequence ends (step S163).

The drive of the FAF optical system 11b by the central one-point distance measurement in step S154 may be performed in block units. FIG. 18 is a flowchart showing the zoom setting sequence in step S120 in the flowchart shown in FIG.

When zoom setting is started (step S17)
1) As initialization, the switching unit 11f is set to drive the F zoom optical system 11a (step S1).
72).

Next, the CPU 13 determines whether or not the zoom-up switch 13a is on (step S173).
Here, if the zoom-up switch 13a is on,
The zoom system of the photographing optical system and the F zoom optical system 11a are driven toward the tele side by a predetermined amount (step S175), and step S
Return to 173. On the other hand, if the zoom-up switch 13a is not on, the process proceeds to step S174.

In step S174, it is determined whether the zoom down switch 13b is on. Here, when the zoom down switch 13b is turned on, the zoom system of the photographing optical system and the F zoom optical system 11a are driven toward the wide side by a predetermined amount (step S176), and the process returns to step S173.
On the other hand, if the zoom-down switch 13b is not on, this sequence ends (step S177).

FIG. 19 shows the finder optical system 1 in step S109 in the flow chart shown in FIG.
6 is a flowchart showing a sequence for calculating a drive position of the FAF optical system 11b in the No. 1 system.

A method of converting the zoom magnification of the F-zoom optical system 11a and the distance measurement information Lec of the multi-distance measuring device 14 into information on diopter and setting the drive position block according to the value will be described.

When the calculation of the drive position of the FAF optical system 11b is started (step S181), information Li concerning the diopter is obtained.
Is calculated by the following formula (step S182). Li = (magnification) ² / Lec (3) Then, according to the information Li calculated from the equation (3),
The block at the corresponding position of the FAF optical system 11b is set (step S183). Then, the drive position Ld of the FAF optical system 11b is determined according to the block (step S184). Then, the process exits this sequence (step S185).

As will be described later, although the block is divided into three in the third embodiment, the number of blocks may be any number as long as it is one or more. Further, in the equation (3), the information Li may be calculated only by the distance (distance measurement information) without using the magnification, and the corresponding block may be set.

FIG. 20 shows the above information Li and FAF optical system 1.
It is a figure which shows the relationship with the block of the position of 1b. From the detected distance information, information Li is calculated by (magnification squared) / (detection distance) shown in the equation (3), and this information L is calculated.
Convert from i to the block at the position of the FAF optical system 11b. The closer the detection distance is, the larger the block value is, and the larger the magnification is, the larger the block value is.

Regarding the division of the above block, 1
It is good to divide by a unit between ~ 4 diopters. Further, the block value may be changed by an external setting, for example, a change of ROM, an external switch, communication, or an IC card.

Although the F diopter optical system 11c is automatically driven, it may be manually driven as in the conventional case. As described above, according to the third embodiment, it is possible to provide the finder device that can adjust the diopter shift due to the distance of the subject at a high speed in time without feeling discomfort.

Further, according to each of the above-described embodiments, it is possible to provide the finder device which can correct the diopter deviation due to the distance of the object without a feeling of strangeness and with a shorter time lag.
According to the above embodiment of the present invention, the following configurations can be obtained. (1) A multi-rangefinder for measuring a plurality of points including the center of a shooting screen, a finder optical system including an AF optical system, and a finder for controlling the positions of the multi-rangefinder and the AF optical system. A finder device for a camera, comprising a control device and a drive device for driving the AF optical system, wherein the finder control device is provided with a number of focus detection points smaller than a normal multi-range finding of the multi-range finding device. A finder device for a camera, characterized in that the AF optical system is set to an optimum position based on distance measurement information. (2) The viewfinder device for a camera as set forth in (1), wherein the multi-range finding device measures the center first. (3) The multi-distance measuring device has a first distance measuring means for simply measuring the distance only in the center and a second distance measuring means for measuring a plurality of points other than the center with high accuracy. The finder device for a camera according to (1) above. (4) According to the reciprocal of the distance detected by the first distance measuring unit, the adjustment position of the AF optical system is divided into a finite number of blocks. Finder device. (5) The camera according to (3) above, wherein the distance measurement by the first distance measuring means is performed at a predetermined time interval until the distance measurement by the second distance measuring means is started. Finder device. (6) The finder device for a camera according to (5), wherein the finder control device drives the AF optical system every time distance measurement is performed by the first distance measuring means. (7) The finder device for a camera according to (1), wherein the finder control device divides the adjustment position of the AF optical system into a finite number of blocks according to the reciprocal of the distance. (8) The camera finder device according to (1), wherein the finder control device divides the adjustment position of the AF optical system into a finite number of blocks based on the reciprocal of distance measurement. (9) A multi-distance measuring device that measures a plurality of points including the center of the shooting screen, a finder optical system including a zoom optical system and an AF optical system, distance measuring information of the multi-distance measuring device, and the zoom A finder device for a camera, comprising: a finder control device for controlling the position of the AF optical system based on magnification information of the optical system; and a drive device for driving the AF optical system. Is a finder device for a camera, characterized in that the AF optical system is set to an optimum position on the basis of distance measurement information at a distance measuring point which is smaller than that of the normal multi distance measuring device. (10) The finder device for a camera as set forth in (9), wherein the multi-range finding device measures the center first. (11) The multi-distance measuring device has a first distance measuring means for simply measuring only the center and a second distance measuring means for highly accurately measuring a plurality of points other than the center. A finder device for a camera according to (9) above. (12) The distance measurement by the first distance measuring means is the same as the second distance measurement.
The camera finder device according to (11), wherein the distance measurement is performed at predetermined time intervals until the distance measurement of the distance measurement means is started. (13) The camera finder device according to (11), wherein the finder control device drives the AF optical system every time distance measurement is performed by the first distance measuring means. (14) The finder control device uses the AF optical function as a function of a value obtained by dividing the square of the magnification by the distance based on the distance measurement information detected by the first distance measuring means and the magnification information of the zoom optical system. The camera finder device according to (11), wherein the adjustment position of the system is divided into a finite number of blocks. (15) The finder control device divides the adjusted position of the AF optical system into a finite number of blocks as a function of a value obtained by dividing the square of the magnification by the distance based on the distance measurement information and the zoom magnification information. A finder device for a camera according to (9) above. (16) A multi-distance measuring device that measures a plurality of points including the center of a shooting screen, a simple distance measuring device that simply measures a wide range, and a finder optical system including a zoom optical system and an AF optical system. A finder control device that controls the position of the AF optical system based on the distance measurement information of the simple distance measuring device and the magnification information of the zoom optical system, and a drive device that drives the AF optical system. The finder control device
Based on the distance measurement information from the simple distance measuring device, the AF
A viewfinder device for a camera that drives an optical system to an optimum position. (17) The camera finder device according to (16), wherein the distance measurement by the simple distance measurement device is performed prior to the distance measurement by the multi-distance measurement device. (18) The camera finder device according to (16), wherein the distance measurement by the simple distance measurement device is performed at a predetermined time interval prior to the distance measurement by the multi-distance measurement device. (19) The camera finder device according to (18), wherein the finder control device drives the AF optical system every time distance measurement is performed by the simple distance measurement device. (20) The camera finder device according to (16), wherein the simple distance measuring device measures a range wider than a single distance measuring range of the multi-range measuring device. (21) The camera finder device according to (20), wherein the simple distance measuring device uses ultrasonic waves. (22) The camera finder device according to (20), wherein the simple distance measuring device uses infrared light. (23) A multi-rangefinder having a plurality of range-finding modes having different range-finding speeds for measuring a plurality of points including the center of a shooting screen; A viewfinder device for a camera, comprising: a control device for controlling the position of the AF optical system using a mode capable of distance measurement at the highest speed, and a drive device for driving the AF optical system.

[0124]

As described above, according to the present invention, it is possible to provide a finder device for a camera which can quickly adjust the deviation of the diopter of the finder depending on the distance to the object without causing any discomfort.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a finder device of a camera of a first embodiment.

FIG. 2 is a flowchart showing a sequence of an F control device 3 as an operation of the camera when the finder device of the first embodiment is applied to the camera.

FIG. 3 is a step S5 in the flowchart shown in FIG.
5 is a flowchart showing a sequence for calculating the drive position of the FAF optical system 1b in the finder optical system 1 in FIG.

FIG. 4 is a flowchart showing a sequence of an F control device 3 as an operation of the camera when the finder device of the modified example of the first embodiment is applied to the camera.

FIG. 5 is a step S2 in the flowchart shown in FIG.
6 is a flowchart showing a sequence for calculating the drive position of the FAF optical system 1b in the finder optical system 1 in FIG.

FIG. 6 is a diagram showing a relationship between information Li and a block at a position of the FAF optical system 1b.

FIG. 7 is a diagram showing an example of a difference in light emission pattern between normal distance measurement and the simple distance measurement.

FIG. 8 is an example showing a structure of a start switch 3a in the first embodiment and a modification.

FIG. 9 is a flowchart showing a sequence for calculating the drive position of the FAF optical system 1b when the simple distance measurement is performed at a plurality of distance measurement points that are smaller than the normal multi distance measurement.

FIG. 10 is a block diagram showing a configuration of a finder device of a camera of a second embodiment.

FIG. 11 is a flowchart showing the sequence of the F control device 3 as the operation of the camera when the finder device of the second embodiment is applied to the camera.

FIG. 12 (a) shows the FAF optical system 1b with a primary imaging plane 1c.
2B is a block diagram showing the configuration of a finder optical system 1 arranged behind the finder optical system, and FIG. 6B is a finder optical system in which a finder diopter optical system (F diopter optical system) 1e is arranged behind the primary imaging surface 1c. 2 is a block diagram showing a configuration of No. 1.

FIG. 13 is a diagram showing the configuration of a finder device when the finder device of the third embodiment is applied to a camera.

FIG. 14 is an example of an external view of a camera when the finder device of the third embodiment is applied to the camera.

FIG. 15 is a flowchart showing the sequence of the CPU 13 as the operation of the camera when the finder device of the third embodiment is applied to the camera.

16 is a flowchart showing a sequence of diopter mode submenu selection in step S117 of the flowchart shown in FIG.

17 is a flowchart showing a diopter adjustment sequence in step S119 in the flowchart shown in FIG.

18 is a flowchart showing a zoom setting sequence in step S120 in the flowchart shown in FIG.

19 is a flowchart showing a sequence for calculating the drive position of the FAF optical system 11b in the finder optical system 11 in step S109 in the flowchart shown in FIG.

FIG. 20 is a diagram showing a relationship between information Li and a block at a position of the FAF optical system 11b.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Viewfinder optical system, 1a ... Viewfinder zoom optical system (F zoom optical system), 1b ... Viewfinder automatic focusing optical system (FAF optical system), 1c ... Primary imaging plane, 1d ... Switching part, 1e ... Viewfinder Degree optical system (F diopter optical system), 2
... finder drive device (F drive device), 3 ... finder control device (F control device), 3a ... start switch (start SW), 4 ... multi-distance measuring device, 5 ... shooting optical system drive device, 6 ... shooting optical system , 7 ... Touch sensor, 8 ... First release switch (1stR), 8a, 8b ... Section, 9 ... Second release switch (2ndR), 9
a, 9b ... Segment, 10 ... Simple distance measuring device, 11 ... Viewfinder optical system, 11a ... Viewfinder zoom optical system (F zoom optical system), 11b ... Viewfinder automatic focusing optical system (F
AF optical system), 11c ... Finder diopter optical system (F diopter optical system), 11d ... Primary image plane, 11e ... Driving part, 1
1f ... switching unit, 12 ... motor driver, 13 ... CPU
(Central Processing Unit; CPU), 13a ...
Zoom up switch (zoom UPSW), 13b ... Zoom down switch (zoom DOWNSW), 13c ...
Mode selection switch (mode SW), 13d ... First release switch (1stR), 13e ... Second release switch (2ndR), 14 ... Multi distance measuring device,
15 ... EEPROM, 16 ... Display LCD.

Claims (3)

[Claims] 1. A finder device having a focusing optical system and a zoom optical system in its optical path, a magnification detecting means for detecting a magnification of the zoom optical system, and a screen central portion for focus adjustment of a photographing lens. A viewfinder control means for controlling the focusing optical system according to a single distance measurement output selected from a plurality of distance measurement points including Finder device. 2. The finder control means, according to a value obtained by dividing the square of the magnification of the zoom optical system by the object distance,
The finder device for a camera according to claim 1, wherein the adjustment position of the focusing optical system is set discretely. 3. A finder device having a focusing optical system and a zoom optical system in its optical path, a magnification detecting means for detecting a magnification of the zoom optical system, and a photographing screen for adjusting the focus of a photographing lens. A first distance measuring means capable of measuring a plurality of predetermined points including the central portion of the second distance measuring means, and a second distance measuring means for measuring only the vicinity of the central portion of the photographing screen wider than the detection point at the central portion of the first distance measuring means. Distance measuring means, finder control means for driving the focusing optical system of the finder device according to the outputs from the first and second distance measuring means and the output from the magnification detecting means. A finder device for a camera, which is characterized by being provided.