JPH0317638A - Zooming controller for camera - Google Patents

Abstract

PURPOSE:To prevent the occurrence of irregularities in irradiation even in the case of using an electronic flash device which has the narrow changed extent of an irradiation angle or whose irradiation angle is fixed by providing a signal outputting means for outputting a viewing angle changing signal in the case that the viewing angle of for photographing based on viewing angle information is larger than the irradiation angle of the electronic flash device. CONSTITUTION:The irradiation angle of a light emitting tube is inputted by communicating with a CPU 31 in the electronic flash device 30. And then, it is decided whether the viewing angle for photographing is equal to or below the irradiation angle by communicating with a CPU 21 in a lens barrel 20 and reading the viewing angle inputted in the CPU 21 from a viewing angle information arithmetic operation circuit 24. In the case of being decided that the viewing angle for photographing is larger than the irradiation angle, the focal distance of a photographing lens 22 is driven to a telephotographic side by a motor 12 through a motor driving circuit 13 by outputting the viewing angle changing signal. Thus, the viewing angle for photographing becomes narrow. Like this, even in the case of using the electronic flash device which has the narrow changed extent of the irradiation angle or the electronic flash device whose irradiation angle is fixed, the whole object in the viewing angle for photographing is illuminated, so that the occurrence of irregularities in irradiating can be prevented.

Description

[Detailed description of the invention] A. Industrial applications The present invention relates to a camera zooming control device.

B. 2. Description of the Related Art There is known a camera that can be equipped with a zoom lens and that can take pictures at various angles of view by electrically changing the focal length of the zoom lens (zooming).

In addition, various cameras have been proposed that are capable of recording, for example, a trimming magnification that specifies the area to be printed, that is, the area to be trimmed, in a predetermined area of the film at the time of shooting in the exposed area of the upper frame of the film. The recorded trimming magnification is read by the printer during printing, and only a predetermined portion of the exposed area on the film is enlarged and output according to the read trimming magnification. Therefore, by changing the trimming magnification when photographing each frame, photographs with various angles of view can be obtained even if the photographing lens is a single focus lens.

C. Problems to be Solved by the Invention However, when taking pictures using an electronic flash device with a camera capable of zooming or trimming the photographic lens as described above, the angle of view of the photographic image changes as shown in Fig. 9, for example. If A is wider than the irradiation angle B of the electronic flash device 30, the entire photographing angle of view will not be illuminated, resulting in uneven illumination.

FIG. 10 shows this phenomenon on the film surface, where 6l indicates the exposure area and 62 indicates the illumination range of the electronic flash device. As can be seen from this figure, the illumination light is not irradiated to the top, bottom, left, and right of the exposure area 61, and as a result, only the peripheral areas of the printed photo are dark, especially the 9th
If the subject is a person as shown in the figure, the person's head and feet will be dark and unnatural.

This phenomenon can be prevented by using an electronic flash device whose illumination angle can be varied over a wide range, but it is possible to take pictures with a wide angle of view by using an electronic flash device whose illumination angle can be changed over a narrow range or whose illumination angle is constant. If this is done, the above-described uneven illumination cannot be prevented.

A technical problem of the present invention is to prevent the above-mentioned irradiation unevenness from occurring even when an electronic flash device whose irradiation angle is changed in a narrow range or an electronic flash device whose irradiation angle is constant is used.

D. Means for Solving the Problems The present invention is applied to a camera zooming control device equipped with a setting means for setting view angle information (for example, focal length or cropping magnification of a photographing lens) for determining a photographing angle of view. . Further, the above-mentioned configuration is provided with a signal output means for outputting a view angle change signal when the photographing view angle based on the view angle information is wider than the irradiation angle of the electronic flash device, and the view angle setting means is configured as follows. Solve technical challenges.

That is, when the view angle change signal is output, the view angle setting means resets the view angle information so that the photographing view angle is narrower than the illumination angle.

E. If the shooting angle of view based on the initially set view angle information is wider than the irradiation angle of the electronic flash device, the view angle information is automatically reset so that the shooting angle of view is narrower than the above irradiation angle. Ru.

F. Embodiment 1 A first embodiment of the present invention will be described with reference to FIGS. 1 to 5.

In FIG. 1 showing the overall structure, the camera body 10 includes:
A lens barrel 20 and an electronic flash device 30 can be attached. Control circuit 1l provided in camera body 10
A motor swelling circuit 13 of the zoom motor 12 is connected to the motor 12, and a coupling 14 is connected to the output shaft of the motor 12. When the lens barrel 20 is attached, the CPU 21 inside the lens barrel 20 is connected to the control circuit 11, and the coupling 23 connected to the photographing lens (zoom lens) 22 is engaged with the coupling l4. .

The control circuit 11 also includes a zooming switch SWI. which is turned on in conjunction with the operation of a zooming button (not shown). SW2 is connected. While the switch SWI is on, the control circuit 11 operates the motor 12 via the motor heel movement circuit 13 in order to change the focal length II (field angle information) of the photographic lens 22 toward the telephoto side. . This rotation of the motor 12 is transmitted to the photographing lens 22 via the coupling 14, 23 and a gear train (not shown), thereby continuously changing the focal length of the photographing lens 22 toward the telephoto side. In other words, a predetermined focal length is set by zooming up. Further, while the switch SW2 is on, the focal length of the photographing lens 22 is continuously changed to the wide-angle side by the motor 12 via the motor adjustment circuit 13. That is, a predetermined focal length is set by zooming down.

A view angle information output circuit 24 is connected to the CPU 21 in the lens barrel 20, and this view angle information calculation circuit 24 detects the focal length of the photographic lens 22 and calculates the lens view angle according to the focal length. calculate. Here, this lens angle of view corresponds to the photographing angle of view, and the longer the focal length, the narrower the photographing angle of view.

The obtained shooting angle of view is inputted to the control circuit 1 on the camera body 10 side via the CPU 21.

On the other hand, when the electronic flash device 30 is attached to the camera body 10, the control circuit ↓1 and the CPU 31 on the electronic flash device 30 side are connected. The CPU 3 1 includes an illumination angle information output circuit 3 that outputs the illumination angle of an arc tube (not shown) stored in advance.
2 is connected, and this illumination angle is inputted to the control circuit 11 on the camera body lO side via the CPU 31. here,
It is assumed that this electronic flash device 30 has a constant irradiation angle.

Next, control procedure III by the control circuit 11 on the camera body 10 side is performed based on the flowcharts in FIGS. 2 and 3.
Explain.

When a release button (not shown) is pressed halfway, the program shown in FIG. 2 is started, and a mode is first detected in step S51. That is, for example, it is determined which of various exposure modes (shutter priority mode or aperture priority mode) is set.

Next, in step S52, a photometer (not shown) is activated to perform photometry, and in step S53, an exposure value (
Aperture value and shutter speed) are calculated and step S
Proceed to step 54.

In step S54, the photographing angle of view (lens angle of view) is determined according to the irradiation angle of the electronic flash device 30 and the focal length of the photographing lens 22.
The photographing angle of view is changed based on the following. The details of this step S4 are shown in Fig. 3. In FIG. 3, first, in step S1, the electronic flash device 30
communicates with the CPU 31, and inputs the illumination angle of the arc tube in step S2. In other words, the illumination angle input to the CPU 31 from the illumination angle information output circuit 32 is read. Next, in step s3, communication is performed with the CPU 21 of the lens
Proceed to.

That is, from the view angle information calculation circuit 24 C1) U2
] Loads the angle of view entered in .

In step S5, it is determined whether the photographing angle of view is less than or equal to the illumination angle. If step S5 is affirmed, the process advances to step S9, where the zoom motor 12 is stopped and step S5 in FIG.
Proceed to step 5. If step s5 is negative, that is, if it is determined that the photographing angle of view is wider than the illumination angle, a view angle change signal is output and the process proceeds to step S6.

In step S6, it is determined whether the photographic lens 22 is at the telephoto end, that is, whether zooming up is no longer possible. If step S6 is denied, step S
In step 7, the focal length of the photographing lens 22 is opened to the telephoto side by the motor 12 via the motor opening circuit 13.

This narrows the shooting angle of view. Thereafter, the process returns to Stenop S3 and repeats the above-described process.

Further, if it is determined in step S6 that the telephoto end is reached, in step S8 a warning that the zoom-up cannot be performed any further, that is, the angle of view cannot be narrowed, is issued via, for example, a liquid crystal display device (not shown). Next, in step S9, the motor l2 is stopped, and the process proceeds to step S55 in FIG. If the above warning is output, replace the lens barrel with one that can set a longer focal length, that is, narrower the shooting angle of view, or replace the electronic flash device with one that has a wider firing angle. need to be replaced.

In step S55, it is determined whether or not the release button has been pressed fully, and if the answer is negative, it is determined in step S56 whether or not the half-press operation has been released. Step S
If 56 is affirmed, the process ends, and if negative, the process returns to step S55.

If step S55 is affirmative, photographing processing is performed in step S57, and the process ends.

According to the above procedure, switch SW. 1. If the photographing angle of view corresponding to the focal length of the photographic lens selected and set by the operation of SW2 is wider than the irradiation angle of the electronic flash device 30, the photographing lens 22 is automatically set when the release button is pressed halfway. zoom-up is performed, and the photographing angle of view A becomes narrower than the illumination angle B, as shown in FIG. 4, for example. Therefore, as shown in FIG. 5, the entire exposure area 7 of the film is included within the irradiation range 72 of the electronic flash device, and uneven irradiation can be prevented.

In the structure of the above embodiment, the CPU II, the motor rotation circuit 13 and the zoom motor l2 serve as the setting means, and the CPU
II constitutes a signal output means. Although the case where a zoom lens is used has been described above, the present invention can also be applied to a case where a multifocal lens whose focal lengths can be changed stepwise is used. 1. Second Embodiment Next, a second embodiment of the present invention will be explained with reference to FIGS. 6 to 8. In FIG. 6, the camera body 40 includes a lens barrel 50.
And the above-mentioned electronic flash device [30] can be attached. A recording circuit 42 is connected to a control circuit 41 provided within the camera body 40. This recording circuit 42 has an LED 43
is connected.

The L-ED 42 is for imprinting the trimming magnification (angle of view information) on a predetermined area of the film when each frame is photographed. Here, the trimming magnification is the film 1 as described above.
This indicates the area to be enlarged and printed out of the exposure area of a frame, that is, the area to be trimmed, and the value equivalent to the focal length is obtained by multiplying this trimming magnification by the focal length of the photographing lens. For example, the focal length of the photographic lens is 35m.
m and the 1-rimming magnification is "2", the focal length equivalent value is 70 mm, and a photograph with the same angle of view as when photographing with a photographic lens with a focal length of 70 mm is obtained. In the camera of this embodiment, a plurality of trimming magnifications can be selected and set by operating an operating member (not shown). A control unit 41 serving as a setting means sets a predetermined trimming magnification in accordance with the operation of this operating member, and displays a field frame corresponding to the set trimming magnification in a viewfinder (not shown).

Then, a recording signal for recording the set trimming magnification is output to the recording circuit 42 described above at the time of photographing. Inside the lens barrel 50, there is a CPU 51 and a view angle information output circuit 5 that outputs the focal length of the photographic lens stored in advance.
2 and a photographic lens (not shown), which is a single focal length lens with a constant focal length. Next, the processing procedure by the control circuit 41 will be explained.

When the desired trimming magnification is set by operating the operating member and the release button is pressed halfway, the program shown in FIG. 2 is activated, and after the processing of steps 351 to S53 described above, the process proceeds to step 854.

FIG. 7 shows the details of step S54 in this embodiment, that is, the processing procedure for changing the angle of view.
4 (already explained in FIG. 3) is performed, and then in step S21, the photographing angle of view is determined from the currently set trimming magnification and the input lens field of view of the photographing lens. Here, in the first embodiment, the lens angle of view itself corresponds to the photographing angle of view, but in this embodiment, the angle of view when trimming is performed on this lens angle of view becomes the photographing angle of view. That is, for the same lens angle of view, the larger the trimming magnification, the narrower the shooting angle of view.

Next, the process proceeds to step S22, and it is determined whether the obtained photographing angle of view is less than or equal to the illumination angle. When blue is determined in step S22, the process proceeds to step S26, in which the set trimming magnification is stored, and in step S27, a visual field frame corresponding to this trimming magnification is formed in the finder, and the process proceeds to step S55 in FIG. If step S22 is negative, that is, if it is determined that the photographing angle of view is wider than the illumination angle, a view angle change signal is output and the process proceeds to step S23.

In step S23, it is determined whether or not the trimming limit has been reached, that is, whether it is impossible to set a larger trimming magnification. If step S23 is negative, the process proceeds to step S24, where the trimming magnification is changed and set to a value that is one step larger, and the process returns to step 821 to repeat the above process.

Furthermore, if it is determined in step S23 that the trimming limit has been reached, a warning that the shooting angle of view cannot be narrowed any further is displayed on the liquid crystal display in step S25. (not shown), the process proceeds to step S55 in FIG. 2 via steps 826 and 527.

Thereafter, the photographing process (step S57) is performed by fully pressing the release button; at this time, the trimming magnification stored in step S26 is imprinted on a predetermined area of the film by the LED 43 via the recording circuit 42. This imprinted trimming magnification is read by the printing device at the time of printing, and only a predetermined portion of the exposed area of the film is enlarged and printed according to this trimming magnification.

Note that if the trimming limit is determined in step S23 above, when recording the trimming magnification on the film, the electronic flash device rI! Data indicating that the irradiation angle of L30 was insufficient may also be recorded. In other words, if there is a note to that effect on the output print, it is easy to know that the unsatisfactory finish was caused by the photographer himself. According to the above. If the shooting angle of view determined by the lens angle of view of the shooting lens and the cropping magnification is wider than the irradiation angle of the electronic flash device 30, the cropping magnification is automatically changed to a larger value when the release button is pressed halfway. , the shooting angle of view becomes narrower than the illumination angle. Therefore, as shown in FIG. 8, the area 82 to be trimmed out of the entire exposure area 81 of one frame on the film is included within the irradiation range 83 of the electronic flash device, and uneven irradiation can be prevented.

In the above description, the trimming magnification is optically imprinted on a predetermined area on the film, but the present invention is not limited to this.
For example, the information may be electrically recorded on a memory provided in a film cartridge. Further, the timing for recording the trimming magnification is not limited to the time of photographing, but may be recorded at once when all frames have been photographed.

Furthermore, in a camera that is capable of both the zooming of the photographic lens described in the first embodiment and the trimming described in the second embodiment, either one is possible depending on whether the photographic lens attached is a single focus lens or a zoom lens. You may choose. Furthermore, in such a camera, if the telephoto end is determined in step S6 of FIG. 3, for example, the process may proceed to step S21 of FIG. 7 to narrow the angle of view by trimming.

G. Effects of the Invention According to the present invention, when the originally set shooting angle of view is wider than the irradiation angle of the electronic flash device, this shooting angle of view is automatically set to be narrower than the above-mentioned irradiation angle. Even when an electronic flash device whose illumination angle can be changed in a narrow range or an electronic flash device whose illumination angle is constant is used, the entire subject within the photographic angle of view is illuminated, and uneven illumination that occurs in the conventional method can be prevented.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention, FIG. 1 is a block diagram showing the overall structure of a zooming control device for a camera according to the present invention, and FIGS. A flowchart showing the processing procedure of control by the control circuit, Fig. 4 is an explanatory diagram explaining the relationship between the shooting angle of view and the irradiation angle of the electronic flash device, and Fig. 5 shows the exposure area on the film and the illumination range of the electronic flash device. FIG. 6 to 8 show a second embodiment of the present invention, FIG. 6 is a block diagram showing the overall structure, FIG. 7 is a flowchart of the processing procedure, and FIG. 8 is an exposure area and an electronic flash device. It is a figure showing the illumination range of. FIG. 9 and FIG. 10 show conventional examples and correspond to the fourth and FIG. 5, respectively.

Claims (1)

[Scope of Claims] 1) A camera zooming control device including a setting means for setting view angle information for determining a photographing angle of view, wherein the photographing angle of view based on the view angle information is the illumination angle of an electronic flash device. further comprising a signal output means for outputting a view angle change signal when the view angle is wider than the irradiation angle, and the view angle setting means is configured to set the photographing view angle to be narrower than the illumination angle when the view angle change signal is output. A camera zooming control device, characterized in that the view angle information is reset. 2) The camera zooming control device according to claim 1, wherein the setting means sets a focal length of a photographing lens as the view angle information. 3) The camera zooming control device according to claim 1, wherein the view angle setting means sets a trimming magnification as the view angle information.