JP3066548B2 - Photometric device for camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera photometer, and more particularly, to a photometer for detecting a subject distance to obtain distance measurement data and a photographing optical system. The present invention relates to a photometric device for a camera having a photometric optical system and a photometric unit that receives photometric light flux passing through the photometric optical system and obtains photometric output data.

[0002]

2. Description of the Related Art Several years ago, a photometric device provided in a camera used an average photometry or a center-weighted photometry in which a photometry mode performs an average or center-weighted photometry for a photographing screen area. In the average metering and center-weighted metering, most of the drawing intentions can be almost satisfied, but the special metering intention cannot be satisfied. The area can be changed to several types.

[0003] That is, the present photometric device measures average photometry, center-weighted photometry, partial photometry necessary for exposure based on a highlight or shadow standard, partial photometry for measuring exposure of a backlight portion, and only required portions. The photometry area can be changed in accordance with many photometry modes such as partial photometry.

[0004] Such switching of the photometric area is performed, for example, as disclosed in Japanese Patent Application Laid-Open No. 58-136020.
An electric / optical light-blocking member made of liquid crystal or the like is disposed near a focusing plate of a single-lens reflex camera main body that configures a photometric optical system by branching a part of an observation optical system. When performing average photometry, the entire area corresponding to the shooting screen is transmitted, and when performing partial photometry, the pattern is formed so that the area to be measured is transmitted and other areas are shielded. It is possible to switch between partial photometry and average photometry.

As means for mechanically switching between partial photometry and average photometry, for example, as shown in Japanese Patent Application Laid-Open No. 62-133326, a part of an observation optical system is branched to constitute a photometry optical system. Partial photometry was performed in a state in which a light beam formed in a focusing plate of the camera body that was mechanically movable forward and backward was partially entered by entering a light shielding plate, and all the light beams were transmitted by retracting the light shielding plate. Average photometry is performed in this state.

The above two examples are the photometric switching devices in a single-lens reflex camera. However, when the photographing optical system and the photometric optical system are separately and independently provided as in a compact camera or the like, The position of each unit is set such that the photometric axis corresponding to the photographing optical axis substantially coincides with the subject distance at the infinity position. Therefore, also in this case, switching between partial photometry and average photometry can be performed.

[0007]

In a conventional photometric device for a camera, in a single-lens reflex camera, the correspondence between the actual photographing range and the photometric region may be inconsistent regardless of the subject distance. Although there is no particular problem, when the photographing optical system and the photometric optical system are separately and independently provided as seen in a compact camera, the above-described correspondences do not match. There is a problem.

That is, since the photometry area is set corresponding to the real screen area on the photographing optical axis at the infinity position,
When the subject distance is infinity, the correspondence between the real screen area and the photometric area matches, but as the subject distance changes to the close distance, the parallax increases and the amount of mismatch increases.
This is based on the same principle as finder parallax, in which the actual photographing range and the observation range change according to the subject distance.

In particular, the amount of these mismatches is increasing in recent years, as cameras that can shoot up to the shortest shooting distance up to several tens of centimeters and cameras that have an optical system with a long focal length are increasing.
The difference appears remarkably, and accurate photometry cannot be performed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a photometric device for a camera in which the correspondence between the actual photographing range and the photometric range does not become inconsistent even if the subject distance changes. It is the purpose.

[0011]

According to a first aspect of the present invention, there is provided a distance measuring apparatus for detecting a subject distance to obtain distance measurement data, and a photographing optical system. In a camera having a photometric optical system arranged and a photometric unit that receives photometric light flux passing through the photometric optical system and obtains photometric output data, a plurality of photometric light fluxes passing through the photometric optical system are provided. A plurality of photoelectric conversion elements corresponding to each of the divided photometry areas, and a photometry unit that obtains each photometry output data of the plurality of photoelectric conversion elements, and weights each photometry output data obtained by the photometry section. A correction control unit that changes based on the distance measurement data obtained by the distance measurement device, and corrects a visual axis deviation between a photographic screen obtained by the photographic optical system and a light beam for photometry passing through the photometric optical system, Characterized by having Than it is.

According to a second aspect of the present invention, there is provided a distance measuring apparatus for detecting a subject distance to obtain distance measuring data, a photometric optical system provided separately and independently of a photographing optical system, and the photometric system. A photometric unit that receives photometric light beams passing through the optical system and obtains photometric output data, wherein a plurality of photometric light beams that pass through the photometric optical system correspond to each of a plurality of divided photometric regions. A photometric unit that receives the photoelectric conversion elements and obtains respective photometric output data of the plurality of photoelectric conversion elements, and calculates the respective photometric outputs obtained by the photometric unit based on the distance measurement data obtained by the distance measuring device. In order to correct a visual axis shift between a photographic screen obtained by a photographic optical system and a photometric light beam passing through the photometric optical system when the subject distance is short, a specific one of a plurality of photoelectric conversion elements in the photometric unit is specified. Output of photoelectric conversion element It is characterized in that it comprises a correction control unit for photometric output data.

According to a third aspect of the present invention, a photometric optical system is provided separately and independently of the photographing optical system, and receives photometric light beams passing through the photometric optical system to obtain photometric output data. In a camera having a photometric unit, a photographing distance range switching unit for switching a photographing distance range in the photographing optical system between a normal photographing range and a close-up photographing range, and a light metering light beam passing through the photometric optical system is divided into a plurality of light beam. A plurality of photoelectric conversion elements corresponding to each of the photometry areas, and a photometry unit that obtains each photometry output data of the plurality of photoelectric conversion elements, and weighting of each photometry output obtained by the photometry section is performed by the above-described shooting range switching. The photographing screen obtained by the photographing optical system and the photometric optical system are changed according to when the photographing distance range is switched to the close photographing range side and when the photographing distance range is switched to the normal photographing range side. Is characterized in that it comprises a correction control unit for correcting the axial misalignment vision at close-up of the photometric light beam over to, the.

According to a fourth aspect of the present invention, a photometric optical system is provided separately and independently of the photographing optical system, and receives photometric light beams passing through the photometric optical system to obtain photometric output data. In a camera having a photometric unit, a photographing distance range switching unit for switching a photographing distance range in the photographing optical system between a normal photographing range and a close-up photographing range, and a light metering light beam passing through the photometric optical system is divided into a plurality of light beam. A photometric unit that receives light by a plurality of photoelectric conversion elements corresponding to the respective photometric areas and obtains respective photometric output data of the plurality of photoelectric conversion elements, and the shooting distance range is switched to the close shooting range by the shooting distance range switching unit. Depending on the occasion, in order to correct the visual axis deviation at the time of close-up shooting of the photographic screen obtained by the photographic optical system and the photometric light beam passing through the photometric optical system,
And a correction control unit that uses the output of a specific photoelectric conversion element among the plurality of photoelectric conversion elements in the photometric unit as photometric output data.

[0015]

According to the present invention, there is provided a photometric device for a camera,
When controlling the exposure by measuring the light beam for photometry that passes through the photometric optical system arranged differently from the photographing optical axis, the photometric unit is formed by a plurality of divided elements, and the subject distance data detected by the distance measuring device is used. By changing the weighting of the photometric output data of each element based on the above, parallax between the photographing optical system and the photometric optical system (hereinafter referred to as “parallax”) is substantially eliminated.

According to a second aspect of the present invention, in the photometric device for a camera, the photometric section is formed by a plurality of divided elements, and based on subject distance data detected by the distance measuring device, the photometric output data of each of the elements is obtained. Parallax is corrected by using a specific one.

According to a third aspect of the present invention, there is provided a photometric device for a camera, wherein the photometric section is formed by a plurality of divided elements, and the switching between "normal photography and macro photography" is performed when normal photography and macro photography are performed. The parallax is corrected by changing the weight of the photometric output data of the element.

According to a fourth aspect of the present invention, there is provided a photometric device for a camera, wherein the photometric section is formed of a plurality of divided elements, and the switching between "normal photography and macro photography" is performed when the normal photography and macro photography are performed. Parallax is corrected by using a specific one of the photometric output data of the elements.

[0019]

First, a first embodiment of the present invention will be described.

In FIG. 2, a camera body 1 is provided with a photographing optical system 2, and a finder optical system 3 is provided above the optical axis. This finder optical system 3 includes:
A distance measuring device is built in and configured to obtain distance measurement data d.

Then, beside the finder optical system 3,
A photometric optical system 4 formed separately and independently of the photographing optical system 2 is provided. A plurality of photoelectric conversion elements (which will be described in detail later), which are arranged in correspondence with a plurality of divided photometric regions, receive a photometric light beam passing through the photometric optical system 4 and are located behind the photometric optical system 4. Have.

The camera body 1 is provided with a shutter release button 5 which can be pushed in two stages. The shutter release button 5 is operated by pressing one step at the time of photographing to release a first release switch 14 described later.
(FIG. 1) is turned on, and the second release switch 15 is turned on by further pressing deeply.

Further, on the upper surface of the camera body 1, a shooting mode, a shutter time, an aperture value, an ISO film sensitivity value,
A status indicator 6 for displaying data such as the number of frames to be shot is provided, and a macro shooting button 7 and a strobe 8 for performing macro shooting with the subject distance set to several tens of cm are provided.

On the other hand, an electric circuit system constituting a main part of the present embodiment is as shown in FIG. That is, a CPU 10 for comprehensively controlling the operation of each part of the camera is provided, and the CPU 10 is provided with a distance measuring device 11 that obtains distance measuring data d using a device such as a CCD. Distance data d can be input, and a command signal for appropriately controlling the well-known lens driving device 12 and shutter control device 13 is transmitted.

The first and second release switches 14 and 15 which operate in response to the pressing operation of the shutter release button 5 are connected, and the macro switch 16 which is activated by operating the macro shooting button 7 is connected. ing.

The CPU 10 is supplied with output data of the photometry circuit section 17. The photometric circuit section 17 is No. 1 corresponding to a plurality of divided light receiving areas.
N No. n of the first photometers 18 ₁ and the second photometers 18 ₂
To the n-th photometry unit 18 _n and A / D for A / D conversion of this output
It comprises a converter 19.

As shown in FIG. 3, the _first to n-th photometers 18 ₁ to 18 _n are first to ninth photometers 21 to 29 obtained by dividing a rectangular photographing screen into nine squares. It is formed so that the output of each light receiving element can be separately taken out.

In the photometric circuit for a camera configured as described above, a power switch (not shown) is turned on to perform photographing, and power is supplied to each part of the circuit. From step S0 in the flowchart shown in FIG. Transition.

In step S1, when it is detected that the shutter release button 5 has been pressed by one step and the first release switch 14 has been turned on as an operation prior to photographing, the process proceeds to the next step S2. Acceptance of the 2 release switch 15 is prohibited. That is, at this stage, even if the shutter release button 5 is further depressed one step to turn on the second release switch 15, this on information is not valid data for a series of photographing sequences.

Then, in the next step S3, the distance measuring device 11 operates according to a command from the CPU 10, and distance measuring detection data d is obtained. The distance measurement detection data d is sent to the CPU 10, and the process proceeds to the next step S4, where the CPU 10 performs a distance measurement operation to obtain the distance measurement data d, which is stored in the memory.

Then, control goes to the next step S11.
This step S11 forms a main part of the present invention. The details of the operation are first determined in step S12 as to whether or not the distance measurement data d is larger than the first set distance data L1. In the case of, the process moves to the next step S13, and it is determined whether or not the distance measurement data d is larger than the second set distance data L2. The above-mentioned first set distance data L1 is set to a close distance, for example, 0.7 m, and the second set distance data L2 is set to a medium distance.

In the case of YES in step S13, the process proceeds in the same manner, and when the process proceeds to step S14, it is determined whether or not the distance measurement data d is larger than the n-th set distance data Ln. The n-th set distance data Ln is set to a long distance.

Then, in the case of YES in step S14,
That is, when the distance measurement data d is larger than any of the first, second, and n-th set distance data L1, L2, Ln,
Since it is assumed that the distance is close to 、, and the parallax between the photometric optical system and the photographing optical system is extremely small and can be substantially ignored, the process proceeds to the next step S15, where the first to ninth photometric units 21 to 29 The photometric calculation is performed equally for each output data, and the photometric data in step S11 is obtained.

On the other hand, when step S12 is branched to NO, that is, when the distance measurement data d is the first set distance data L1
If it is smaller, the process proceeds to the next step S16, and a plurality of photometric units 18 ₁ , 18 ₂ constituting the photometric circuit unit 17 are formed.
18 One of _n, for example, as shown in FIG. 5 weights of the fifth photometry unit 25 to "10", first to fourth is another measuring unit, the sixth through to ninth photometric unit 21 no 24 ,
The photometric calculation is performed so that each of the weights 26 to 29 is set to "1". At this time, the exposure control value, that is, the appropriate aperture value and the shutter time are determined as shown in step S5. State and the next step S
Move to 6.

In the above-described photometric weighting in step S16, the distance between the photographing screen and the optical axis of the photometric light flux (parallax) is large because the distance measurement data d is very close. This corresponds to the lower part (the fifth photometric unit 25 in FIG. 5).

Therefore, the lower right portion (fifth photometry unit 25)
The photometric units other than the above have a small weight since the ratio to the exposure determination is small.

With the proper aperture value and the shutter speed thus determined, the acceptance of ON of the second release switch 15 is permitted in step S6, and whether or not the second release stitch S15 is ON in the next step S7. If the second release signal RL2 is not ON, the standby state is continued.

On the other hand, when the second release switch 15 is turned on and the second release signal RL2 is output, the flow shifts to step S8, where the film exposure is performed with the above-described aperture value and shutter time. Next step S
In step S9, the film is fed, and in the next step S10, a series of photographing sequences is completed.

On the other hand, if the distance measurement data d is smaller than the second set distance data L2, in other words, the distance measurement data d is larger than the first set distance data L1 (corresponding to the close distance) and the second set distance data L1 If the distance data is smaller than the distance data L2 (corresponding to the middle distance), the process proceeds to step S17.

[0040] The step S17 is to, as shown in FIG. 6 of the plurality of metering portions 18 ₁ ~ 18 _n constituting the photometric circuit 17, the weighting of the fifth photometric unit 5 to "10", adjacent to the The weights of the second photometer 24, the ninth photometer 29, and the sixth photometer 26 are set to “2”, and the other third photometer 23, second photometer 22, first photometer 21, and eighth photometer are used. 2
8. Photometric control is performed so that the weight of the seventh photometric unit 27 is set to “1”.

In this photometric control, the distribution is weighted on the lower right portion of the photometric portion compared to the weighting in step S16 (see FIG. 5), the portion adjacent thereto is considered next, and further adjacent to the outside. The part is considered next.

This is because, when the subject distance is between the close range and the middle range, the parallax generated between the photographing screen range and the photometric area is more upper left than in the case of the close range described above (in the case of step S16). This means that the side parts are weighted more.

Then, from the next step S5 to step S5
Up to 10 are performed in the same manner as in the above case.

On the other hand, when the distance measurement data d is smaller than the n-th set distance data Ln (corresponding to a long distance), in other words, the distance measurement data d is equal to the (n-1) th set distance data Ln-1.
If it is between the set distance data Ln and the n-th set distance data Ln, the process proceeds to step S18.

[0045] The step S18 is as shown in the plurality of metering portions 18 ₁ ~ 18 _n Figure 7 of constituting a photometric circuit section 17, the lower right portion fifth metering unit 5 of the metering area, the fourth metering unit 24, the weighting of the ninth photometry unit 29 is set to “10”, and the third photometry unit 23, the second photometry unit 22, the first
The photometry control is performed so that the weight of each of the photometry unit 21, the eighth photometry unit 28, and the seventh photometry unit 27 is set to “9”.

In this photometric control, the distribution takes into account more the upper left portion of the photometric portion compared to the weighting in step S17 (see FIG. 6). This is because when the distance measurement data d is between a long distance and ∞, the parallax with the photometry area on the photographing screen slightly occurs, so that the weighting at the lower right is slightly increased.

Then, from the next step S5 to step S
Up to 10 are performed in the same manner as in the above case.
Therefore, when the distance measurement data d is between ∞ and a long distance, since parallax can be ignored, photometry using the entire photometry area is performed uniformly, and as the distance measurement data d approaches the closest side, Photometry is performed by increasing the weighting of the lower right portion of the photometry area stepwise.

The weighting of the photometry is increased stepwise to cancel the parallax that the photometry area corresponding to the photographing screen shifts toward the lower right as the distance measurement data d approaches the closest side. That's why.

Next, a second embodiment of the present invention will be described with reference to FIGS.

In the present embodiment, there are many portions which overlap with the above-described first embodiment, and the description of the same portions will be omitted to avoid complication of description, and only different portions will be described.

That is, the difference is that the photometric unit 18 (see FIGS. 3, 5 to 7) in the first embodiment is changed to a photometric unit 30 shown in FIG. The operation steps are as shown in FIG. 9 in the second embodiment, whereas the operation steps in the first embodiment are as shown in FIG. Step S1 in
1 is changed to step S21 shown in FIG.

As shown in FIG. 8, the photometric section 30 according to the present embodiment is formed by dividing the entire photometric area into first to fifth photometric sections 31 to 35.

That is, the first photometry section 31 is disposed at the lower right of the photometry area, and the strip-shaped second photometry sections 32 that are in contact with the upper side and the left side of the first photometry section 31, respectively. A strip-shaped third photometer 33 in contact with each of the upper side and the left side of the section 32 is arranged, and a fourth photometer 34 and a fifth photometer 35 similarly arranged in a strip are arranged.

Therefore, as in the first embodiment, step S0
After step S4 is executed, the process proceeds to step S21. First, in step S22, it is determined whether or not the distance measurement data d is equal to or greater than the first set distance data L1.

If step S22 is YES, the process moves to step S23 to determine whether or not the distance measurement data d is equal to or greater than the second set distance data L2. If this step S23 is YES, the comparison of the distance data over n stages is performed in the same manner.

In other words, whether or not the distance measurement data d is equal to or greater than the first set distance data L1, the second set distance data L2... The (n-1) th set distance data Ln-1. Done in In step S24, the distance measurement data d is (n
It is determined whether or not the distance data is equal to or greater than the set distance data L (n-1) of -1). If the determination result is YES, that is, if the distance measurement data d is ∞, the process proceeds to the next step S25.

In this step S25, the distance measurement data d is
Therefore, the photometry using all of the first to fifth photometric units 31 to 35 is performed assuming that the parallax does not occur between the photographing screen and the photometric area.

On the other hand, when NO is determined in the step S22, in other words, since the distance measurement data d is equal to or less than the first set distance data L1 (corresponding to the close distance), a large parallax occurs, and Since the corresponding photometry area is located at the lower right, as shown by hatching in FIG. 10, only the detection output of the first photometry section 31 at the lower right is used as the photometry section data, and the next step S5 Then, the aperture value and the shutter time required for obtaining the proper exposure are obtained, and steps S6 to S10 are similarly performed.

On the other hand, when NO is determined in the step S23, in other words, the distance measurement data d includes the first set distance data L1 (corresponding to the close distance) and the second set distance data L2
(Corresponding to the middle distance), and as shown in FIG. 11, the first and second photometers 31 and 32 are used as photometric output data.

On the other hand, if NO is determined in the step S24, it is determined that the distance measurement data d is between the (n-1) th set distance data L (n-1) and ∞, and the first Photometry section 3
Photometric output data is obtained using the first to fourth photometric units 34.

Therefore, parallax is eliminated by combining a plurality of photometric areas in a stepwise manner so that the photometric area is substantially equal to the actual photographing screen.

Next, a third embodiment of the present invention will be described with reference to FIG. The above-mentioned first and second
In the embodiment, the photometric area is selected in multiple stages in accordance with the magnitude of the subject distance, or is substantially selected by changing the weight, in order to provide the coincidence between the shooting screen and the photometric area. In the third embodiment to be described below, photometry correction is performed in two stages, that is, normal photographing (subject distance is short and Δ) and macro photographing (subject distance is about 30 cm or less).

The photometric unit in the third embodiment is
The photometer 18 shown in FIG. 3 is used. The operation steps include steps S0 to S as shown in FIG.
2. Each of S3 to S10 is the same as in the above embodiment.

Accordingly, after the reception of the second release switch 15 is prohibited in step S2, the process proceeds to step S31, and after step S31 is executed, steps S3 to S10 are executed in the same manner as described above.

Next, the details of step S31 will be described. First, in step S32, it is determined whether or not the macro shooting button 7 has been turned ON. If YES, the process proceeds to the next step S33.

In step S33, as shown in FIG. 5, the weight of the fifth photometer 25 is set to "10", and the other photometers (first to fourth, sixth to ninth photometers 21 to 2) are set.
The photometric calculation is performed so that each of the weights of 4, 26 to 29 is set to "1". At this time, the exposure control value, that is, the appropriate aperture value and the shutter time are determined as shown in step S3. And the second release switch 1
Exposure and feeding are performed in the same manner as described below, provided that the condition 5 is ON.

On the other hand, if NO is determined in the step S32, the distance measurement and the distance measurement calculation are performed in the steps S34 and S35. An exposure control value is determined using the copy data equally (step S36).

Next, a fourth embodiment of the present invention will be described with reference to FIG. The third embodiment described above is
The weighting of the photometric area of the photometric unit during normal shooting and macro shooting is changed in each of normal shooting and macro shooting to correct the parallax of the shooting screen and the photometric area. Is designed to perform photometry using only output data of a photometry unit in a specific photometry area at the time of normal photography and macro photography, respectively.

The flowchart shown in FIG. 13 is obtained by changing step S31 of the flowchart shown in FIG. 12, and the other operations are the same. This step S41 constitutes a main part of the present embodiment. First, in step S42, it is determined whether or not the macro shooting button 7 is turned on.
In the case of YES, it is determined that the shooting is macro shooting, and the flow shifts to the previous step S43.

In step S43, photometry is performed using only a part of the photoelectric conversion elements of the photometry unit 18 (see FIG. 3) formed by the first to ninth photometry units 21 to 29, that is, the fifth photometry unit 25. It calculates output data.

The fifth photometry section 25 is located at the lower right portion of the entire photometry area, and this portion coincides with the actual photometry area corresponding to the photographing screen during macro photography. Therefore, no parallax occurs during macro shooting.

On the other hand, if NO in step S42, that is, if the macro shooting button 7 is turned off, normal shooting is performed. More specifically, first, distance measurement is performed in step S44, and distance measurement calculation is performed in the next step S45, and distance measurement data d is obtained.

Then, focus driving is performed based on the distance measurement data d, and photometry is performed in the next step S46. In this photometry, uniform photometry is performed using the entire photometry area of the photometry unit 18, and the process proceeds to the next step S5 and thereafter, and normal photographing is performed in the same manner as described above.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the scope of the invention.

In the above-described embodiment, since the optical axis of the photographing optical system 2 and the optical axis of the photometric optical system 4 are horizontally displaced and are displaced to the left as viewed from the front of the camera body 1, short-range photographing is performed. Since the corresponding photometry area is sometimes located at the lower right of the area, the area is divided into a plurality of areas as shown in FIG.

However, if the optical axis of the photographing optical system 2 and the optical axis of the photometric optical system 4 in the camera body 1 are vertically displaced, the deviation of the photometric region due to the parallax of both will be at the center of the entire photometric region. This will occur in the vertical direction with respect to the reference.

Therefore, in this case, as shown in FIG. 14, a plurality of photometric units forming the photometric unit 40 are divided into a first photometric region having a photometric area close to the center of the lower side of the photometric unit 40 or a macroscopic distance. Section 41, and the first photometric section 41
A continuous band-shaped area that contacts the right side, upper side, and left side of
The light meter 42 is provided.

Further, the right side, upper side,
A continuous band-shaped area in contact with the left side is referred to as a third photometric unit 43, and the fourth and fifth photometric units 44 and 45 are formed in the same manner.

When the photographing distance is close or macro distance, parallax between the photographing screen and the light measuring area can be corrected by using only the first light measuring unit 41 and using many light measuring units.

On the other hand, the first to fifth photometric units 41 to 4
Instead of selectively using any one of the five, all of the plurality of photometric units may be used, and the respective weights may be changed according to the subject distance or "switching between normal shooting and macro shooting". good.

If the optical axis of the photographing optical system 2 of the camera body 1 and the optical axis of the photometric optical system 4 are opposite to the position shown in FIG. 1, the photometric section 50 is moved as shown in FIG. May be first to fifth photometric units 51 to 55 arranged symmetrically with respect to the photometric unit 30 (see FIG. 8).

In the above-described example, the present invention is applied to a camera of a type in which macro photography is performed at a fixed specific distance without adjusting the distance. Needless to say, the present invention can be similarly applied to a camera of a possible type.

In addition to using only a plurality of photometric elements selectively or changing their weights, parallax correction may be performed using both of them.

Further, as a specific example of dividing the photometering section into a plurality, it is possible to arbitrarily set it in addition to the above-described division into squares and bands.

[0085]

As is apparent from the above description, the present invention varies the photometric area or changes the weight according to the subject distance or the photographing mode. An apparatus can be provided.

The parallax based on the shift between the optical axis of the photographic optical system and the optical axis of the photometric optical system is corrected in accordance with the subject distance, so that photometry can be accurately performed corresponding to the photographic screen.

The parallax generated between the photographing screen and the photometric area increases as the subject distance approaches,
In particular, when the subject distance is short or in a macro area, the problem occurs remarkably, and in some cases, a portion having no relation to the photographing screen is measured.

However, according to the present invention, since the large correction is performed when the subject distance is short or in the macro area, the above-mentioned problem can be solved.

[Brief description of the drawings]

FIG. 1 is an electric circuit block diagram showing a main part of an embodiment of the present invention.

FIG. 2 is a perspective view showing an example of the appearance of a camera to which the present invention can be applied.

FIG. 3 is a front view showing details of a photometric unit shown in FIG. 1;

FIG. 4 is a flowchart showing the operation of the first embodiment of the present invention.

FIG. 5 is a front view showing a specific example of photometric weighting in the steps shown in FIG. 4;

FIG. 6 is a front view showing a specific example of photometric weighting in the steps shown in FIG. 4;

FIG. 7 is a front view showing a specific example of photometric weighting in the steps shown in FIG. 4;

FIG. 8 is a front view showing details of a photometric unit used in a second embodiment of the present invention.

FIG. 9 is a flowchart showing the operation of the second embodiment of the present invention.

FIG. 10 is a front view showing a specific example of switching of the photometric unit shown in FIG.

FIG. 11 is a front view showing a specific example of switching of the photometric unit shown in FIG. 9;

FIG. 12 is a flowchart showing the operation of the third embodiment of the present invention.

FIG. 13 is a flowchart showing the operation of the fourth embodiment of the present invention.

FIG. 14 is a front view showing a modified example of the photometric unit.

FIG. 15 is a front view showing another modified example of the photometry unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera main body 2 Photographing optical system 3 Viewfinder optical system 4 Photometric optical system 5 Shutter release button 6 Status indicator 7 Macro photography button 8 Strobe 10 CPU 11 Distance measuring device 12 Lens drive device 13 Shutter control device 14 First release switch 15 First 2 Release switch 16 Macro switch 17 Photometry circuit section 18 Photometry section 19 A / D converter 21, 31, 41, 51 First photometry section 22, 32, 42, 52 Second photometry section 23, 33, 43, 53 Third photometry Sections 24, 34, 44, 54 Fourth photometry section 25, 35, 45, 55 Fifth photometry section 26 Sixth photometry section 27 Seventh photometry section 28 Eighth photometry section 29 Ninth ninth photometry section

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G03B ^7/ 00-7/28 G02B ⁷ /28-7/40 G03B 3/00-3/12

Claims (4)

(57) [Claims] 1. A distance measuring device for detecting a subject distance to obtain distance measurement data, a photometric optical system disposed independently of a photographing optical system, and a photometric light beam passing through the photometric optical system. A photometric unit that receives the photometric output data and receives the photometric light flux passing through the photometric optical system with a plurality of photoelectric conversion elements corresponding to each of a plurality of divided photometric regions. A photometric unit that obtains each photometric output data of the photoelectric conversion element, and changes the weight of each photometric output data obtained by the photometric unit based on the distance measurement data obtained by the distance measuring device,
A photometric device for a camera, comprising: a correction control unit that corrects a visual axis deviation between a photographic screen obtained by the photographic optical system and a luminous flux passing through the photometric optical system. 2. A distance measuring device for detecting distance to an object to obtain distance measurement data, a photometric optical system provided independently of a photographing optical system, and a photometric light beam passing through the photometric optical system. A photometric unit that receives the photometric output data and receives the photometric light flux passing through the photometric optical system with a plurality of photoelectric conversion elements corresponding to each of a plurality of divided photometric regions. A photometric unit that obtains each photometric output data of the photoelectric conversion element, and a photo screen obtained by the above-described photo-taking optical system based on each photometric output obtained by the photometric unit based on the distance measurement data obtained by the distance measuring device. And to correct the visual axis deviation between the photometric light beam passing through the photometric optical system when the subject distance is short,
A photometric device for a camera, comprising: a correction control unit that uses an output of a specific photoelectric conversion element among the plurality of photoelectric conversion elements in the photometric unit as photometric output data. 3. A camera comprising: a photometric optical system provided separately and independently of a photographing optical system; and a photometric unit for receiving photometric light flux passing through the photometric optical system and obtaining photometric output data. A photographing distance range switching means for switching a photographing distance range in the photographing optical system between a normal photographing range and a close-up photographing range; and a plurality of light metering light beams passing through the light metering optical system corresponding to each of a plurality of divided light metering regions. And a weighting unit for obtaining the respective photometric output data of the plurality of photoelectric conversion elements, and weighting the respective photometric outputs obtained by the photometric unit. The distance between the photographic screen obtained by the photographic optical system and the proximity of the photometric light beam passing through the photometric optical system is changed according to the switching to the range side and the normal photographic range side. A correction control unit that corrects visual axis deviation at the time of imaging; and a photometric device for a camera. 4. A camera comprising: a photometric optical system provided separately and independently of a photographing optical system; and a photometric unit that receives photometric light flux passing through the photometric optical system and obtains photometric output data. A photographing distance range switching means for switching a photographing distance range in the photographing optical system between a normal photographing range and a close-up photographing range; and a plurality of light metering light beams passing through the light metering optical system corresponding to each of a plurality of divided light metering regions. A photometric unit which receives the photometric output data of the plurality of photoelectric conversion elements and receives the photometric output data of the plurality of photoelectric conversion elements; Of the plurality of photoelectric conversion elements in the photometric unit in order to correct the visual axis deviation at the time of close-up photography between the photographic screen obtained by the system and the photometric luminous flux passing through the photometric optical system. A correction control unit that uses the output of the specific photoelectric conversion element as photometric output data.