JP2001174898A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera permitting to reduce photographing (exposure) with a filter effect against user's intention, and also permitting to be speedily reset to the filter-effective state. SOLUTION: A camera provided with a filter optical system arranged in a photographing optical path has a state detection means 15 for detecting the state of the camera, and the filter optical system can operate, and when a state change is detected by the state detection means 15 before performing exposure operation, during operating to set a filter position or after having set the filter position, the filter optical system gives a warning; halts exposure operation even if an exposure operation start means is operated; and performs the filter position setting operation again. When the filter position resetting operation is performed, the reoperation is performed making the filter position at the time of starting the reset operation as a reference position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera provided with a filter capable of changing a position such as rotation in a photographing optical path and a finder optical path.

[0002]

2. Description of the Related Art Conventionally, in a TTL single-lens reflex camera, since light passing through a photographing lens is guided to a finder, when a polarizing filter or the like is used, the polarizing filter or the like is attached to a female screw provided at the tip of the photographing lens. The external thread of the portion is screwed and fixed, and some filters such as a polarizing filter have a structure in which the filter portion can rotate with respect to the mounting portion. Then, while looking through the viewfinder of the camera, the photographer manually rotates a polarizing filter or the like about an axis parallel to the optical axis of the photographing lens, and visually checks the viewfinder screen so that a desired filter effect can be obtained. The image was taken with the rotation position of the polarizing filter etc. adjusted.

In order to eliminate the inconvenience of attaching and detaching a filter, Japanese Patent Application Laid-Open No. 8-334809 discloses that a built-in filter is electrically moved in and out of an optical path of a taking lens.

In Japanese Patent Application Laid-Open No. 5-34116, two polarizing filters are arranged in a lens barrel such as an interchangeable lens for a video camera, and one of the filters is rotated by an actuator to adjust the light amount of the interchangeable lens, especially the mirror lens. It is disclosed to be performed continuously.

Further, in a twin-lens camera such as a lens shutter camera, the optical axis of the photographing lens is different from the optical axis of the finder, and light passing through the photographing lens cannot be observed. In Japanese Utility Model Laid-Open No. 60323/1991, a polarizing filter is provided on the front of both the photographing lens and the finder so as to be synchronously rotatable, and the photographer manually rotates the polarizing filter on the photographing lens. Then, since the polarizing filter on the finder side also rotates synchronously, a proposal has been made such that the effect of the polarizing filter during photographing can be confirmed through the finder.

In addition, recently, there has been proposed a camera that automatically moves the filter into and out of the photographing optical path and adjusts the effect of the filter automatically.

[0007] This will be described below.

In the above proposal, when the filter use setting has been made, the filter is automatically rotated when a switch (hereinafter referred to as SW1), which is a means for starting a photographing preparation operation such as photometry and distance measurement, is turned on. Then, the light transmitted through the filter is measured, and the filter position (polarization angle) at which the output of the photometric sensor, for example, the photometric data of the subject or the like is the minimum is determined to be the maximum. For example, if you want to obtain the maximum effect, stop the filter at the minimum position of the photometric result. If you want to obtain an effect of about 3/4, stop the filter at the minimum and 3/4 of the maximum value of the photometric result. Or when the difference between the minimum value and the maximum value of the photometric result is smaller than a predetermined value, it is determined that the filtering effect cannot be obtained, and the filter is retracted.

[0009]

However, in a camera having the above-described filter built-in and capable of automatically adjusting the position of the filter (set angle and the like) during the photographing preparation operation, the photographing preparation operation is temporarily performed. In this case, when the photographing is completed after the preparation for photographing is completed, that is, the setting of the filter position is completed, and the state of the camera such as framing is changed, particularly the posture of the camera is changed, the filtering effect is reduced.

In a twin-lens camera as disclosed in Japanese Utility Model Laid-Open Publication No. Hei 3-60323, it is necessary to provide a filter for a photographing optical system and a filter for a finder optical system in order to confirm a filter effect. If the two filters are simultaneously driven to simultaneously observe the filter effect in the photographing optical system through the viewfinder, the load is increased mechanically and electrically, and particularly, the position of the repeated filter (polarization angle) must be changed. In such cases, the influence of the load is large, so that a great deal of design considerations such as improvement of the electric power supply capability and reduction of mechanical friction are required. In many cases, the diameter is substantially larger than that of the filter. It takes time better to position the academic system filters, i.e. also occurs a problem that it takes time to move the same amount.

Furthermore, there is a case in which there is a time lag due to the filter position setting operation, which causes a great inconvenience in photographing a moving object or the like.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a camera capable of reducing photographing (exposure) in which a filter effect contrary to a user's intention is obtained and quickly returning to a state in which a filter effect can be obtained. It is in.

[0013]

According to a first aspect of the present invention, there is provided a camera provided with a filter optical system provided in a photographing optical path and capable of changing a position of a filter.
A camera state detecting means for detecting a state of the camera such as a posture of the camera, and if the state detecting means detects a change in the state of the camera during the filter position setting operation or after the filter position setting is determined and before the exposure operation is performed. A warning is issued, the exposure operation is prohibited even if the exposure operation start means is operated, and the filter position setting operation is performed again. In position.

Thus, in the camera which can automatically adjust the filter position (set angle) during the photographing preparation operation, the photographing preparation operation including the filter position setting operation is once performed, and after the photographing preparation is completed, that is, after the filter position setting is completed. ,
Even when a photograph is taken with a camera state change such as a framing change, especially a change in the camera posture, the photographing (exposure) that produces a filter effect contrary to the user's intention is reduced, and the filter effect is quickly performed. Can be returned to the state where the above is obtained.

According to a second aspect of the present invention, a first filter optical system provided in a photographic optical path and a second filter optical system provided in a finder optical path are provided. And a camera in which the position of each filter is changeable, wherein the position setting operations of the first filter optical system and the second filter optical system are performed separately, that is, not performed simultaneously.

More specifically, each filter optical system has a filter position detecting means, a finder filter position setting means and a photographing filter position setting means, and also serves as a photographing preparation operation start means. By operating the setting means photographing, the filter optical system in the finder optical path, which is the position setting operation of the filter optical system in the finder optical path, is driven and stopped.
The position of the filter optical system in the photographic optical path is detected by detecting the position of the filter in the finder optical path by the finder filter position detecting means and subsequently or by operating the photographic filter position setting means also serving as the exposure operation starting means. Driving the filter optical system in the photographing optical path and detecting the position corresponding to the detection result of the finder filter position detecting means by the photographing filter position detecting means.
To stop.

Further, there is provided photometric means, and the filter optical system in the finder optical path also includes a light receiving optical path of the photometric means.
The filter optical system in the finder optical path is driven by the operation of the finder filter position setting means, and the photometric operation by the photometric means is performed, and the stop position of the filter optical system in the finder optical path is determined based on the photometric result by the photometric operation. It is in.

Thus, even in a camera having a filter for a two-lens type photographing optical system for automatically controlling the filter position and a filter having a finder optical system, an increase in mechanical and electrical loads when the two filters are driven can be prevented. In addition, by setting the position in a short time using the finder optical system and moving the photographing optical system filter to the set position, the total filter position setting time can be reduced.

According to a third aspect of the present invention, there is provided a camera including a filter optical system disposed in a photographing optical path, wherein the filter optical system is drivable, and a filter position setting means is provided. With the exposure operation priority selection means, when the exposure operation priority selection means is set, by prioritizing the photographing operation without performing the filter position setting operation, without prioritizing only the filter effect, It is possible to use the camera with emphasis on quick shooting according to the user's intention.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 is a perspective view showing the internal structure of the main part of the camera according to the present embodiment, and shows a state in which the filter has entered the optical path of the taking lens.

Reference numeral 1 denotes a first polarizing filter which is a filter optical system in a photographing optical path disposed on the optical axis of a photographing optical system (not shown). The first polarizing filter is held and fixed by a first filter holding frame 1a. A gear 1c (hereinafter referred to as a first filter gear) rotatably supported by the filter support member 1b on the subject side and rotatable about an axis parallel to the optical axis of the photographing lens, and receiving rotational power on the rear side of the outer periphery, that is, on the film surface side. Is provided.

The description of the photographing optical system excluding the first filter will be omitted for convenience.

Reference numeral 2 denotes an idler gear, which connects between a small gear 4b described later and a first filter gear 1c.

Reference numeral 3 denotes a first filter driving motor (hereinafter referred to as a first motor).
Reference numeral 3a denotes a first motor worm gear, and 4 denotes a first two-stage gear composed of a bevel gear 4a and a small gear 4b whose large gear meshes with the first motor worm gear 3a.

Reference numeral 5 denotes a first phase plate, which is fixed to the rear end of the filter holding frame 1a concentrically with the rotation axis of the first polarizing filter.

The first phase plate 5 is provided with a conduction pattern, and the first switch group 6 allows the absolute angle of the first polarizing filter 1 to be recognized.

That is, the first phase plate 5 and the first switch group 6 constitute a photographing filter position detecting means.

Numeral 10 denotes a second polarizing filter which is disposed in the optical path for the finder and for photometry and is a filter optical system in the finder optical path including the light receiving optical path of the photometric means, and is held and fixed by a second filter holding frame 10a. In addition, a gear 10b (hereinafter, referred to as a second filter gear) that receives the rotational power is provided.

The light beam transmitted through the second polarizing filter is transmitted through a prism (not shown) to the AE sensor 25 and the finder eyepiece 16 which are photometric means.

The description of the photometric optical system and the finder optical system excluding the second filter is omitted for convenience.

11 is a second filter driving motor (hereinafter referred to as a second motor), 11a is a second motor worm gear,
Reference numeral 12 denotes a second two-stage gear including a bevel gear 12a and a small gear 12b whose large gear meshes with the second motor worm gear 11a.

Reference numeral 13 denotes a phase detection gear comprising a small gear 13a meshing with the second filter gear 10b and a second phase plate 13b fixed concentrically with the rotation shaft of the small gear 13a.
The second phase plate 13b is provided with a conduction pattern, and the second switch group 14 allows the absolute angle of the second polarizing filter 10 to be recognized.

That is, the second phase plate 13b and the second switch group 14 are finder filter position detecting means.

The conduction pattern of the first phase plate 5 according to the polarization angle of the first polarization filter 1 and the second filter 1
It is assumed that the conduction pattern configuration of the second phase plate 13b corresponding to the polarization angle of 0 is associated one-to-one.

It is assumed that one rotation of the second polarizing filter 10 and one rotation of the second phase plate 13b are associated with each other.

Reference numeral 15 denotes a posture detecting sensor which is a camera state detecting element for detecting a posture of the camera, for example, a vertical position, a horizontal position, and the like.

Although the filter in the present embodiment is a polarizing filter, the present invention is not limited to this. For example, it is specified in advance that the present invention is effective for a cross filter or the like whose effect varies depending on the angle. Keep it.

The operation (driving) of the filter in the present embodiment is rotation (rotation), but it is specified in advance that the present invention is not limited to this.

Further, the present embodiment is used for driving a polarizing filter for a photographing optical system as a first polarizing filter and a filter for a finder optical system as a second polarizing filter.
Although each is configured to have a motor independently, the present invention is not limited to this. For example, each filter is individually driven by switching the transmission path of the driving force of a single motor by a planetary gear. It is specified in advance that there is no problem with the method.

In addition, in the present embodiment, the state detecting element of the camera is a posture detecting sensor. However, the present invention is not limited to this. For example, a camera holding (moving) state by an acceleration sensor, an angular velocity sensor, or the like. Detection and GP
It is assumed that there is no problem even if the state of the camera is detected by detecting the absolute position of the camera by S or the like.

FIG. 2 is a circuit block diagram of a main part of the camera.

In the figure, reference numeral 20 denotes a power supply battery of the camera,
Reference numeral 21 denotes a control circuit including a microcomputer for controlling various operations of the camera, an A / D converter, various amplifiers, and the like, and has a built-in memory 21a serving as a storage unit for storing acquired data.

Reference numeral 22 denotes the first motor 3 and the second motor 11
A motor drive circuit 23 for controlling the rotation of the camera is provided with a preparation switch (hereinafter referred to as S) which is a photographing preparation operation starting means for starting collection of photographing information such as distance measurement and photometry.
W1), and in the present embodiment also serves as a finder filter position setting unit.

Reference numeral 24 denotes an exposure switch (hereinafter referred to as SW2) which is an exposure operation start means for starting an exposure operation for a film (not shown) based on various information collected by operating the preparation switch 23. This embodiment also serves as a photographing filter position setting unit.

Reference numeral 25 denotes an AE sensor which is the photometric means already described in FIG. 1, reference numeral 26 denotes a well-known distance measuring circuit (hereinafter, referred to as AF circuit) for measuring the distance to the subject, and reference numeral 27 denotes the aforementioned AF circuit. A well-known shutter circuit (hereinafter, referred to as an SH circuit) for performing opening and closing operations for exposing the film by operating the exposure switch 24. This is a well-known film feeding circuit for rewinding the film when a number of exposures have been completed.

Reference numeral 29 denotes a well-known strobe means including a charging circuit and a light-emitting portion for performing strobe light emission control at the time of an exposure operation based on subject photometric information and the like obtained by the AE sensor 25, and 30 denotes photographing mode information, film frame count and the like. And a well-known display means such as an LCD which also serves as a notifying means for notifying the user of a warning and a warning means for urging the user to be warned when a problem occurs.

The first switch group 6 described with reference to FIG.
The state of the second switch group 14 is also detected by the control circuit 21.

Further, the control circuit 21 recognizes the detection information of the attitude detection sensor 15 described with reference to FIG.

FIG. 3 is a flow chart showing a part of the operation of the control circuit 21 according to the first embodiment of the present invention, and is a sequence flow chart when the SW 123 is operated (ON).

A description will be given below accordingly.

[Step 1] The posture detection sensor 15 detects the posture information of the camera and stores the information in the memory 21.
It is stored in the predetermined area P0 of a.

[Step 2] Information from the second switch group 14, which is a finder filter angle detecting means, is detected as position information of the second polarizing filter 10, and the detected information is stored in a predetermined area f0 of the memory 21a. Similar data is stored in a predetermined area fs · fp of the memory 21a.
In this step, the same information is stored in the three storage areas.

[Step 3] The AE sensor 25 detects the light transmitted through the second polarizing filter 10 and detects the photometric information, and stores the photometric information in a predetermined area AE0 of the memory 21a.

[Step 4] The motor drive circuit 22 is controlled to rotate the second motor 11 at a predetermined speed in a predetermined direction, thereby rotating the second motor 11 from the second motor worm gear 11a to the second two-stage gear 12 / gear 10b. And the second polarizing filter 1 held and fixed to the second filter holding frame 10a.
Rotate 0.

In this rotating operation, the small gear 13a and the second phase plate 13b fixed to the small gear 13a are simultaneously rotated by the power transmission from the gear 10b.

[Step 5] Information from the second switch group 14 is detected as position information of the second polarizing filter 10, and
The detection information is compared with information in a predetermined area f0 of the memory 21a. When the detection information is no longer f0, it is determined that the filter position has changed, and the process proceeds to step 6.

[Step 6] Information from the second switch group 14 is detected as position information of the second polarizing filter 10, and
The detection information is stored in a predetermined area f1 of the memory 21a.

[Step 7] The AE sensor 25 detects the light transmitted through the second polarizing filter 10 and detects the photometric information, and stores the photometric information in a predetermined area AE1 of the memory 21a.

[Step 8] The photometric information AE0 and AE1 stored in the memory 21a are compared. If AE0> AE1, the process proceeds to step 9, and if AE0> AE1, the process proceeds to step 11.

[Step 9] The information stored in the predetermined area f1 of the memory 21a is transferred and stored in the predetermined area fp.

[Step 10] The information stored in the predetermined area AE1 of the memory 21a is transferred and stored in the predetermined area AE0. That is, at the time when the step 10 is completed, after executing the present sequence control, the second photometry data having the lowest photometric data is obtained.
The position of the polarizing filter 10 is stored in the predetermined area fp of the memory 21a, and the lowest photometric data is stored in the predetermined area AE0 of the memory 21a.

[Step 11] The information stored in the predetermined area f1 of the memory 21a is transferred and stored in the predetermined area f0.

[Step 12] The posture detection sensor 15 detects the posture information of the camera and stores the information in the memory 21.
The data is stored in the predetermined area P1 of FIG.

[Step 13] It is determined whether or not the posture information stored in the predetermined areas P0 and P1 of the memory 21a is the same, that is, whether or not the posture has changed since the step 1, and if not P0 = P1 The process proceeds to step 14 if P0 = P1.

[Step 14] It is notified that the posture has changed.
A notification (warning) is given by the display means 30.

[Step 15] The information stored in the predetermined area P1 of the memory 21a is transferred and stored in the predetermined area P0. When the routine for executing step 15 is entered, the predetermined area fs of the memory 21a is the filter position information that is currently set in the next step (step 2). Since the data of the predetermined area f0 is stored, even if the filter position setting is restarted, the filter position at the start of the resetting operation (current) is set as the reference position, and this sequence in which SW1 is turned ON The filter setting operation can be performed continuously without returning to the filter position at the start.

[Step 16] The information of the predetermined areas fs and f0 in the memory 21a is compared. If fs = f0, the flow proceeds to step 5. If fs = f0, the second polarization filter 10 sets
The process proceeds to step 17 assuming that the rotation is 60 °.

[Step 17] While detecting information from the second switch group 14 as position information of the second polarizing filter 10, the information is compared with a predetermined area fp of the memory 21a, and the detected information is stored in a predetermined area of the memory 21a. When fp is reached, the process proceeds to step 18.

[Step 18] By controlling the motor drive circuit 22 and stopping the rotation of the second motor 11, the second
The rotation of the polarizing filter 10 is stopped. That is, the second
This means that the polarizing filter 10 is set and stopped at the filter position where the transmitted photometric result is the lowest.

[Step 19] As a photographing preparation operation, A
Well-known photometric information and distance measuring information are collected and calculated by the E sensor 25 and the AF circuit 26 to obtain processing information for performing proper exposure at the time of exposure. Since the operation is a well-known operation, a detailed description is omitted.

[Step 20] SW2 24 is operated (O
N) It is detected whether or not the operation has been performed. If the operation has been performed, the process proceeds to an exposure operation start sequence (detailed description with reference to FIG. 4). If the operation has not been performed, the process proceeds to step 21.

[Step 21] It is detected whether or not the state of SW123 has changed (OFF).
The sequence ends, and if not turned off, the process proceeds to step 22.

[Step 22] The posture detection sensor 15 detects the posture information of the camera, and stores the information in the memory 21.
The data is stored in the predetermined area P1 of FIG.

[Step 23] It is determined whether or not the posture information stored in the predetermined areas P0 and P1 of the memory 21a is the same, that is, whether or not the posture has changed since step 1; if not P0 = P1, The process proceeds to step 14 if P0 = P1.

The above is the sequence flowchart when the SW123 is operated (ON) in the first embodiment of the present invention.

FIG. 4 is a sequence flowchart of the control circuit 21 when the SW2 24 is operated (ON) according to the first embodiment of the present invention. To start.

[Step 31] The posture detection sensor 15 detects the posture information of the camera and stores the information in the memory 21.
The data is stored in the predetermined area P1 of FIG.

[Step 32] It is determined whether or not the posture information stored in the predetermined areas P0 and P1 of the memory 21a is the same, that is, whether or not the posture has changed since the step 1, and if not P0 = P1 If P0 = P1, the process proceeds to step.

[Step 33] It is notified that the posture has changed.
A notification (warning) is given by the display means 30, and the sequence is terminated without performing the exposure operation.

[Step 34] The motor drive circuit 22 is controlled to rotate the first motor 3 at a predetermined speed in a predetermined direction, thereby changing the first motor worm gear 3a to the second two-stage gear 4, the idler gear 2, the first filter. The rotation power is transmitted to the gear 1c, and the first polarizing filter 1 held and fixed to the first filter supporting member 1b and the first filter holding frame 1a is rotated.

In this rotation operation, the first phase plate 5 fixed concentrically with the rotation axis of the first polarizing filter is also rotated at the same time.

[Step 35] While detecting the information from the first switch group 6 as the position information of the first polarizing filter 1, the second setting completed in step 18 of FIG.
The memory 21a which is position information of the polarizing filter 10
When the detected information reaches the corresponding position, the process proceeds to step 36.

As described above, this embodiment is based on the premise that the conductive patterns of the first phase plate 5 and the second phase plate correspond one-to-one, so that the positional information of the first polarizing filter 1 and the memory 21a The comparison of the predetermined area fp is performed.

[Step 36] The rotation of the first polarizing filter 1 is stopped by controlling the motor drive circuit 22 to stop the rotation of the first motor 3. That is, the first polarization filter 1 is set and stopped at the same filter position as the second polarization filter 10.

[Step 37] The posture detection sensor 15 detects the posture information of the camera and stores the information in the memory 21.
The data is stored in the predetermined area P1 of FIG.

[Step 38] It is determined whether or not the posture information stored in the predetermined areas P0 and P1 of the memory 21a is the same. If P0 = P1, go to step 33; if P0 = P1, go to step 39. I do.

[Step 39] Based on the processing information obtained in step 19 of FIG. 3, a so-called well-known exposure operation for controlling the SH circuit 27 and the strobe means 29 is executed. Since this operation is well known, a detailed description is omitted.

[Step 40] A so-called well-known feeding operation of feeding the film by a predetermined amount, for example, one frame, by the film feeding circuit 28 is performed, and the sequence ends. Since this operation is well known, a detailed description is omitted.

The above is the sequence flowchart when the SW2 24 is operated (ON) in the first embodiment of the present invention.

As can be seen from the flowcharts of FIGS. 3 and 4, in the present embodiment, the first polarizing filter 1
And the position setting operation of the second polarizing filter 10 are not performed simultaneously, and the switch position of the second polarizing filter 10 is set by turning on SW1 23, and SW2 24 is turned on.
As a result, the position of the first polarizing filter 1 is set at a position corresponding to the setting position of the second polarizing filter 10 in time series.

When the state (posture) of the camera changes after each filter position is set, a warning operation is performed, and the starting point of the resetting operation is used as the reference position without setting the initial position. The filter position resetting operation is performed, and the exposure operation is not executed when the state (posture) of the camera changes after the filter position is set even if the switch SW224 is turned on.

(Second Embodiment) In the first embodiment, since the position of the first polarizing filter is not set until the SW2 24 is turned on, for example, the SW1 23 is turned on in advance in preparation for photographing. Even if the photometry and distance measurement information collection by
Since a time lag occurs before 224 is turned ON and the shutter opening / closing operation is actually performed by the shutter circuit as the actual exposure operation, there is a possibility that the photographing of a desired scene may fail.

According to the second embodiment of the present invention, in consideration of the above-mentioned problems, a camera state change such as a framing change, particularly a camera posture change, etc., can be performed without reducing the rapidity with respect to the start of an exposure operation. Even when the photographing is performed, the main purpose is to reduce the photographing (exposure) in which the filter effect is contrary to the user's intention.

Referring to FIGS. 5, 6, and 7, a second embodiment of the present invention will be described in detail.

The configuration of the camera according to this embodiment is the same as that of the first embodiment, and a description thereof will be omitted.

FIG. 5 is a flow chart showing a part of the operation of the control circuit 21 according to the second embodiment of the present invention, and is a sequence flow chart when the SW123 is operated (ON).

The description will be made below in accordance with this.

[Step 51] The posture detection sensor 15 detects the posture information of the camera and stores the information in the memory 21.
It is stored in the predetermined area P0 of a.

[Step 52] The information from the second switch group 14, which is the finder filter angle detecting means, is transmitted to the second switch group 14.
Detected as position information of the polarizing filter 10, the detected information is stored in a predetermined area f0 of the memory 21a, and similar data is stored in a predetermined area fs · fp of the memory 21a.
In this step, the same information is stored in the three storage areas.

[Step 53] AE sensor 25 detects light transmitted through the second polarizing filter 10 to detect photometric information, and stores the photometric information in a predetermined area AE0 of the memory 21a.
To memorize.

[Step 54] The motor driving circuit 22 is controlled to rotate the second motor 11 at a predetermined speed in a predetermined direction, thereby rotating the second motor 11 from the second motor worm gear 11a to the second two-stage gear 12 / gear 10b. Is transmitted, and the second polarizing filter 10 held and fixed to the second filter holding frame 10a is rotated. In this rotation operation, the small gear 13a and the second phase plate 13b fixed to the small gear 13a are simultaneously rotated by the power transmission from the gear 10b.

[Step 55] Information from the second switch group 14 is detected as position information of the second polarizing filter 10, and the detected information is compared with information of a predetermined area f0 of the memory 21a. If the detection information is no longer f0, it is determined that the filter position has changed, and the process proceeds to step 6.

[Step 56] Information from the second switch group 14 is detected as position information of the second polarizing filter 10, and the detected information is stored in a predetermined area f1 of the memory 21a.

[Step 57] The second polarizing filter 10
The AE sensor 25 detects light transmitted through the AE sensor 25 and detects the light measurement information, and stores the light measurement information in a predetermined area AE1 of the memory 21a.
To memorize.

[Step 58] The photometric information AE0 and AE1 stored in the memory 21a are compared. If AE0> AE1, go to step 59. If AE0> AE1, go to step 6.
Move to 1.

[Step 59] The information stored in the predetermined area f1 of the memory 21a is transferred and stored in the predetermined area fp.

[Step 60] The information stored in the predetermined area AE1 of the memory 21a is transferred and stored in the predetermined area AE0. That is, at the time when the step 10 is completed, after executing the present sequence control, the second photometry data having the lowest photometric data is obtained.
The position of the polarizing filter 10 is located in a predetermined area fp of the memory 21a, and the lowest photometric data is stored in the memory 2a.
This is stored in the predetermined area AE0 of 1a.

[Step 61] The information stored in the predetermined area f1 of the memory 21a is transferred and stored in the predetermined area f0.

[Step 62] The posture detection sensor 15 detects the posture information of the camera and stores the information in the memory 21.
The data is stored in the predetermined area P1 of FIG.

[Step 63] It is determined whether or not the posture information stored in the predetermined areas P0 and P1 of the memory 21a is the same (whether or not the posture has changed since step 1). The process proceeds to step 64 if P0 = P1.

[Step 64] It is notified that the posture has changed.
A notification (warning) is given by the display means 30.

[Step 65] The information stored in the predetermined area P1 of the memory 21a is transferred and stored in the predetermined area P0.

[Step 66] The information of the predetermined areas fs and f0 in the memory 21a is compared. If fs = f0, the flow proceeds to step 55. If fs = f0, the second polarization filter 10 is determined to have rotated 360 °, and step 67 is performed. Move to.

[Step 67] While detecting information from the second switch group 14 as position information of the second polarizing filter 10, the information is compared with a predetermined area fp of the memory 21a.
When the detection information reaches the predetermined area fp of the memory 21a, the process proceeds to step 68.

[Step 68] By controlling the motor drive circuit 22 to stop the rotation of the second motor 11, the second
The rotation of the polarizing filter 10 is stopped. That is, the second
This means that the polarizing filter 10 is set and stopped at the filter position where the transmitted photometric result is the lowest.

[Step 69] The motor drive circuit 22 is controlled to rotate the first motor 3 at a predetermined speed in a predetermined direction, thereby changing the first motor worm gear 3a to the second two-stage gear 4, the idler gear 2, and the first filter. The rotation power is transmitted to the gear 1c, and the first polarizing filter 1 held and fixed to the first filter supporting member 1b and the first filter holding frame 1a is rotated. In this rotation operation, the first phase plate 5 fixed concentrically with the rotation axis of the first polarizing filter is also rotated at the same time.

[Step 70] While detecting the information from the first switch group 6 as the position information of the first polarizing filter 1, the position information of the second polarizing filter 10 which has been set in step 68, ie, The position information corresponding to the predetermined area fp in the memory 21a is compared with the corresponding position information.

As described above, this embodiment employs the first
Since the conduction pattern configuration between the phase plate 5 and the second phase plate is assumed to correspond one-to-one, the position information of the first polarizing filter 1 is compared with the predetermined area fp of the memory 21a.

[Step 71] By controlling the motor drive circuit 22 to stop the rotation of the first motor 3, the rotation of the first polarizing filter 1 is stopped. That is, the first polarization filter 1 is set and stopped at the same filter position as the second polarization filter 10.

[Step 72] The posture detection sensor 15 detects the posture information of the camera and stores the information in the memory 21.
The data is stored in the predetermined area P1 of FIG.

[Step 73] It is determined whether or not the posture information stored in the predetermined areas P0 and P1 of the memory 21a is the same. If P0 = P1, go to step 52; if P0 = P1, go to step 74. I do.

[Step 74] As a photographing preparation operation, A
Well-known photometric information and distance measuring information are collected and calculated by the E sensor 25 and the AF circuit 26 to obtain processing information for performing proper exposure at the time of exposure. Since this operation is well known, a detailed description is omitted.

[Step 75] SW2 24 is operated (O
N) It is detected whether or not the operation has been performed. If the operation has been performed, the process proceeds to an exposure operation start sequence (detailed description with reference to FIG. 7). If the operation has not been performed, the process proceeds to step 76.

[Step 76] It is detected whether or not the state of SW123 has changed (OFF).
The sequence is ended, and if not turned off, the process proceeds to step 77.

[Step 77] The posture detection sensor 15 detects the posture information of the camera and stores the information in the memory 21.
The data is stored in the predetermined area P1 of FIG.

[Step 78] Check whether the posture information stored in the predetermined areas P0 and P1 of the memory 21a is the same.
That is, it is determined whether or not the posture has changed in step 51 and subsequent steps.
If P0 = P1, the process proceeds to step 75.

The above is the sequence flowchart when the SW123 is operated (ON) in the second embodiment of the present invention.

FIG. 7 is a sequence flowchart of the control circuit 21 when the SW2 24 is operated (ON) according to the second embodiment of the present invention. Start.

[Step 81] The posture detection sensor 15 detects the posture information of the camera, and stores the information in the memory 21.
The data is stored in the predetermined area P1 of FIG.

[Step 82] It is determined whether or not the posture information stored in the predetermined areas P0 and P1 of the memory 21a is the same. If P0 = P1, go to step 83; if P0 = P1, go to step 84. I do.

[Step 83] The display means 30 notifies (warns) that the posture has changed.

[Step 84] The SH circuit 27 and the flash unit 29 are controlled based on the processing information obtained in step 74 of FIG. A so-called well-known exposure operation is performed.

[Step 85] The film feeding circuit 28 feeds a predetermined amount of film (for example, one frame).
A so-called well-known feeding operation is performed, and the sequence ends.

The above is the description of SW2 24 in the embodiment of Hata.
9 is a sequence flowchart in a case where is operated (ON).

As can be seen from the above description, in the present embodiment, the filter position setting for the photographing optical system is performed after the filter position setting for the finder optical system in time series during the photographing preparation operation. It has become possible to ensure the quick-shot nature of.

(Third Embodiment) In the first and second embodiments, a series of photographing operations (SW1 ON to SW2)
ON), the filter position is always adjusted, so that a time lag always occurs after the switch operation and before the start of exposure.

In view of such a problem, the second embodiment also proposes a technique for improving the quick shooting performance of the operation after SW2 is turned on. However, the filter position adjustment time when SW1 is turned on is proposed. Always occurs.

In view of the above problems, the third embodiment of the present invention takes an image by setting a filter position according to a user's need even in a camera having a filter optical system disposed in an image taking optical path. The main purpose is to enable the operation to be performed with priority.

The third embodiment according to the present invention will be described with reference to FIGS.
The embodiment will be described in detail.

In this embodiment, the internal structure of the main part of the camera is the same as that of FIG. 1 described in the first embodiment, and a description thereof will be omitted.

FIG. 8 is a circuit block diagram of a main part of the camera, which is basically the same as FIG. 2 described in the first embodiment, and therefore only different parts will be described.

As shown in FIG. 8, reference numeral 31 denotes a photographing priority switch which is an exposure operation priority selecting means for deciding which of the filter position setting and the photographing operation is to be prioritized. When the switch 23 is operated, the filter position setting priority operation is performed. When the switch 23 is turned on, the filter position setting operation is not performed when the SW1 23 is operated, and the photographing operation, that is, the photographing preparation operation, the exposure operation, and the like are prioritized. . Other configurations have already been described with reference to FIG.

FIG. 9 is a flowchart showing a part of the operation of the control circuit 21 in the present embodiment.
23 is a sequence flowchart when the operation is performed (ON), and the description will be made in accordance with the flowchart.

[Step 90] The state of the photographing priority switch 31 is detected. If the state is OFF, the sequence proceeds to an exposure operation sequence for adjusting the filter position (see FIGS. 3 and 5).
If N, the process proceeds to step 91.

[Step 91] As a shooting preparation operation, A
Well-known photometric information and distance measuring information are collected by the E sensor 25 and the AF circuit 26, and the collected information is subjected to calculation to obtain processing information for performing proper exposure at the time of exposure.

[Step 92] SW2 24 is operated (O
N) It is detected whether or not the operation has been performed. If the operation has been performed, the process proceeds to step 93; otherwise, the process proceeds to step 95.

[Step 93] Based on the processing information obtained in step 91, the SH circuit 27 and the strobe means 29
Is controlled. A so-called well-known exposure operation is performed.

[Step 94] The film feeding circuit 28 feeds a predetermined amount of film (for example, one frame).
A so-called well-known feeding operation is performed, and the sequence ends.

[Step 95] It is detected whether or not the state of SW123 has changed (OFF).
The sequence ends, and if not turned off, the process proceeds to step 92.

The above is the description of SW123 in the present embodiment.
Is a part of a sequence flowchart in a case where is operated (ON).

In step 90, the photographing priority switch 31
The sequence in the case where is OFF has already been described in the first and second embodiments (FIG. 3 or FIG. 5), and a description thereof will be omitted.

In this embodiment, even when the photographing priority switch 31 is turned on, the filter remains disposed in the photographing optical path. However, the present invention is not limited to this and has been described in the conventional example. As described above, the advance / retreat of the filter in the photographing optical path is a well-known technique. If the photographing priority switch 31 is ON, the position of the filter is not set, and the filter is retracted to give priority to the exposure operation. Not something.

[0154]

As described above, according to the first aspect, in a camera capable of automatically adjusting a filter position (set angle) during a photographing preparation operation, a photographing preparation operation including a filter position setting operation is performed once. After the completion of shooting preparation, that is, the completion of setting the filter position, even if a change in the camera state such as a framing change, in particular, a change in the posture of the camera is to be performed, a filter effect contrary to the user's intention is obtained. It is possible to reduce photographing (exposure) and quickly return to a state where a filter effect can be obtained.

According to the second aspect of the present invention, an increase in mechanical and electrical loads at the time of driving the two filters is prevented, and the position is set in a short time by the finder optical system, and the image is taken to the set position. By moving the optical system filter, it is possible to reduce the total filter position setting time.

Further, according to the third aspect of the present invention, it is possible to use the image taking priority on quick shooting in accordance with the user's intention, without giving priority only to the filter effect.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an internal structure of a main part of a camera according to a first embodiment of the present invention.

FIG. 2 is a circuit block diagram of a main part of the camera according to the first and second embodiments of the present invention.

FIG. 3 is a first operation flowchart of the control circuit according to the first embodiment of the present invention;

FIG. 4 is a second operation flowchart of the control circuit according to the first embodiment of the present invention;

FIG. 5 is a first operation flowchart of a control circuit according to a second embodiment of the present invention;

FIG. 6 is a flowchart showing a continuation of the flowchart of FIG. 5;

FIG. 7 is a second operation flowchart of the control circuit according to the second embodiment of the present invention;

FIG. 8 is a circuit block diagram of a main part of a camera according to a third embodiment of the present invention.

FIG. 9 is an operation flowchart of a control circuit according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... 1st polarizing filter 3 ... 1st filter drive motor 5 ... 1st phase plate 6 ... 1st switch group 10 ... 2nd polarizing filter 13 ... Phase detection gear 13b ... 2nd phase plate 21 ... Control circuit 15 ... Attitude Detection sensor 23 SW1 24 SW2 25 Photometric sensor 31 Priority switch

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03B 17/02 G03B 17/02 F term (Reference) 2H002 AB01 BB01 BB03 BB05 DB00 DB05 DB21 EB00 FB28 FB39 FB71 FB84 GA00 GA35 GA66 ZA00 2H018 AA02 BE00 2H083 AA01 AA06 AA07 AA10 AA25 AA29 AA30 AA32 AA53 2H100 AA01 BB05 BB09 EE00 FF01 FF02 2H102 AA71 AB23 BB01

Claims (13)

[Claims] 1. A camera having a filter optical system provided in an imaging optical path and capable of changing a position of a filter, and having state detecting means for detecting a state of the camera, wherein a filter is being set or a filter is being set. A camera, comprising: a warning unit that warns when the posture state detection unit detects a change in the state of the camera after the position setting is determined and before the exposure operation is performed. 2. A camera having a filter optical system provided in a photographing optical path and capable of changing a position of a filter, and having state detecting means for detecting a state of the camera, wherein the state detecting means detects the state of the camera. A camera comprising a control unit that does not perform an exposure operation even when an exposure operation start unit is operated when a change is detected. 3. A camera having a filter optical system provided in a photographing optical path and capable of changing a position of a filter, and having a state detecting means for detecting a state of the camera, wherein the state of the camera is detected by the state detecting means. A camera having control means for performing a filter position setting operation again when a change is detected. 4. The control unit according to claim 3, wherein when performing the reset operation of the filter position, the control unit performs the reset operation using the filter position at the start of the reset operation as a reference position. camera. 5. A system according to claim 1, further comprising a first filter optical system disposed in a photographing optical path, and a second filter optical system disposed in a finder optical path, wherein said first filter optical system and said second filter optical system are provided. A camera capable of changing a position of a filter optical system, wherein a position setting operation of the first filter optical system and the second filter optical system is performed in time series. 6. A first filter optical system provided in a photographic optical path and a second filter optical system provided in a finder optical path, wherein the first filter optical system and the second filter optical system are provided. A camera capable of changing the position of a filter optical system, wherein a position setting operation of the first filter optical system and a position setting operation of the second filter optical system are not performed simultaneously. 7. First and second detecting means for detecting the positions of the first and second filter optical systems, respectively, and first and second means for setting the positions of the first and second filter optical systems. A second position setting means for driving / stopping the second filter optical system by the operation of the second position setting means, and detecting the second position detected by the second detection means.
7. The camera according to claim 5, wherein the first position setting means is operated so as to stop the first filter optical system corresponding to the stop position of the filter optical system. 8. A first and a second detecting means for respectively detecting the positions of the first and second filter optical systems, and a first and a second means for setting the positions of the first and second filter optical systems. A second position setting means for driving and stopping the second filter optical system by the operation of the second position setting means, and subsequently detecting the second filter optical system by the second detection means. 7. The camera according to claim 5, wherein the first position setting means is operated so as to stop the first filter optical system corresponding to a stop position of the filter optical system. 9. The apparatus according to claim 7, wherein said second position setting means also serves as a photographing preparation operation starting means, and said first position setting means also serves as an exposure operation starting means. camera. 10. The photometric device provided in the first and second filter optical systems, wherein the second filter optical system also includes a light receiving optical path of the photometric device. Camera according to one. 11. The second filter optical system is driven by the operation of the first position setting means, a photometric operation is performed by the photometric means, and the second filter is operated based on a photometric result of the photometric operation. The camera according to claim 10, wherein a stop position of the optical system is determined. 12. A filter optical system disposed in a photographing optical path, the position of which can be changed by a filter position setting unit, and an exposure operation priority selection unit. When the exposure operation priority selection unit is set, A camera characterized in that a photographing operation is preferentially performed without performing the filter position setting operation. 13. The filter optical system according to claim 1, wherein the filter optical system is a polarizing filter or a cross filter whose effect changes depending on a rotation angle around an optical axis.
A camera according to any one of the preceding claims.