JPH04345145A - Camera - Google Patents

Abstract

PURPOSE:To photograph a sharp image without having the unevenness of the brightness of an object, even if a consecutively moving object is photographed by setting the opening/closing of a shutter to a low speed side, and the depth of a field to a deep side, in a stop value setting program, and reducing a difference in the high speed operation of a machine element, and further, to attain a blurring warning display at the time of exceeding a blurring value by limiting the difference in the high speed operation of the machine element by means of the opening/closing of the shutter at a desired operation difference range, with a small stop value, in the other stop value setting programs. CONSTITUTION:An exposure program selecting switch SW1 and a mode selecting switch SW2 selecting a multiple exposure mode through the use of a single exposure mode, are provided. The stop value setting program incorporated in a CPU 20, is executed in corresponding to the positions of the exposure program selecting switch SW1 and the mode selecting switch SW2. In the stop value setting program, an exposure program has the forcible setting of a small diaphragm, and program control for setting the opening/closing of the shutter to the low speed side, and the depth of the field to the deep side. In the other setting programs, the small stop value and the blurring value are provided for the stop value and an exposing time, respectively.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to cameras, and in particular, when the multiple exposure mode is selected by a mode selection means for selecting between a single exposure mode and a multiple exposure mode, a small aperture value is forcibly set according to the brightness of the subject. The present invention relates to a camera in which the aperture value is set to a predetermined small aperture value or shifted to a predetermined small aperture value.

0002

BACKGROUND OF THE INVENTION Conventional cameras are sometimes provided with mode selection means for selecting between a single exposure mode and a multiple exposure mode.

[0003] A mode selection means is provided, and when the multiple exposure mode is selected by the mode selection means, the amount of exposure for each exposure must be determined so that the total amount of exposure resulting from the exposure operation is a proper exposure. In other words, in the case of three multiple exposures, it is desirable to set the exposure amount for each exposure to one third.

Generally speaking, for the same subject brightness, in multiple exposure mode, compared to single exposure mode, the shutter opens and closes faster, the aperture value changes to a smaller aperture, and an exposure program is set so that the total exposure amount becomes the desired exposure amount. Control. In order to programmatically control the total amount of exposure each time to the desired amount of exposure, multiple exposure mode requires faster shutter opening and closing and a smaller aperture value than single exposure mode for the same subject brightness. Transition to the aperture side. When the shutter opening/closing transitions to the high speed side, the exposure operation deviates from the nominal exposure time due to operational errors in mechanical elements. This deviation from the nominal exposure time not only affects the total exposure amount, but also affects the amount of exposure for the first and subsequent exposures when shooting a continuously moving subject in multiple exposure mode. When there is a difference in the brightness of the subject, the brightness of the subject becomes uneven, making the photograph unsightly, and depending on the development and printing time, it may not be possible to correct it.

[0005]

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks.The present invention has been made in view of the above-mentioned drawbacks.The present invention is made by forcibly setting the exposure program to a small aperture value when the multiple exposure mode is selected by the mode selection means. , a camera that can program the depth of field to a deep side and take clear images with even brightness even when photographing continuously moving subjects by reducing errors due to high-speed operation of mechanical elements. The purpose is to provide.

Further, in the camera according to the present invention, when the multiple exposure mode is selected by the mode selection means, if a small aperture limit value and a camera shake limit value are provided for the aperture value and exposure time, respectively, high-speed operation errors of mechanical elements due to opening and closing of the shutter can be avoided. To provide a camera capable of suppressing camera shake within a desired operating error range and displaying a camera shake warning when the camera shake exceeds the camera shake value.

[0007]

[Means for Solving the Problems] A camera according to the present invention includes:
Exposure program selection means for selecting an optimal exposure program from a plurality of exposure programs including an aperture value priority program, mode selection means for selecting a single exposure mode and a multiple exposure mode, and a multiple exposure mode selected by the multiple exposure mode selection means and an aperture value priority program setting means for forcibly setting the exposure program selected by the exposure program selection means to a small aperture value priority program when the exposure program is selected by the exposure program selection means.

The camera according to the present invention also includes an exposure program selection means for selecting an optimal exposure program for calculating an optimal combination of exposure time and aperture value from a plurality of exposure programs including an aperture value priority program, and a single exposure mode. and a mode selection means for selecting a multiple exposure mode, and an exposure time of the other determined by the exposure program selection means is shorter than one exposure time predetermined according to the number of multiple exposures in the multiple exposure mode selected by the mode selection means. When the exposure time of the other side reaches the exposure time of one side, the aperture value is successively reduced to a smaller aperture value. and hand wave warning display program means for displaying a hand wave warning when the exposure time exceeds .

[0009]

[Embodiment] An embodiment of the camera according to the present invention is shown below in FIG.
-Details will be explained according to FIG.

As shown in FIG. 1, the camera according to the present invention is provided with a liquid crystal display 8, a release button 11, an exposure program selection switch SW1, and a mode selection switch SW2 on the top surface of the camera body 1. The main body 1 also includes a light receiving section 5 and a light projecting section 4.
An AF unit 3, a finder 6, and a strobe 7 are mounted on the front, and a lens barrel 2 is also installed.

As shown in FIG. 2, the light receiving section 5 and light projecting section 4 of the AF unit 3 are connected to the CPU 20 via an AF interface 14 having an A/D conversion function and an electrical/optical conversion function. Further, an exposure program selection switch SW1 and a mode setting switch SW2 are connected to the CPU 20, and when the exposure program selection switch SW1 is pressed, the exposure program control sequentially selects manual exposure mode, normal exposure mode, high speed exposure mode, and depth priority mode. is,
The selected exposure program control is displayed on the liquid crystal display 8. Also, if you press the mode selection switch SW2,
Either the single exposure mode or the multiple exposure mode is selected and the selected mode is displayed on the liquid crystal display 8.

The release button 11 connected to the CPU 20 is a two-stage operation switch, and when the first stage is activated, the battery switch 16 is closed and the battery 15 is connected to the CPU 20. When the battery 15 is connected to the CPU 20, the battery capacity is checked, and if the battery does not have a predetermined capacity, a display indicating that the battery capacity is insufficient is displayed on the liquid crystal display 8. AF with battery 15 connected to CPU 20
Photometry and distance measurement are performed by the optical system circuit including the light receiving section 5 and the light projecting section 4 of the unit 3, and the photometry data and the distance measurement data are calculated by the arithmetic circuit provided in the CPU 20. When the calculation is finished, CP
U20 controls the shutter aperture 12 and the lens 2a of the lens barrel 2 via the shutter/lens drive IC13.

Further, the CPU 20 is provided with aperture value setting programs 21 and 22 shown in FIGS. 3 and 4. The aperture value setting program 21 determines whether the release button 11 is pressed halfway or not in a branch process F1, and when the release button 11 is pressed halfway, the battery switch 16 shown in FIG. 2 is closed and the battery 15 is supplied. . Process this battery 15
Hold the power at 2 and check the battery capacity. Next, a selection switch subroutine F3 is executed. The selection switch subroutine F3 is a subroutine that determines the branch destination of the program according to the positions of the exposure program selection switch SW1 and the mode selection switch SW2. When the exposure program selection switch SW1 is in the manual exposure mode, normal exposure mode, high speed exposure mode, or depth priority mode, the program tags are set to 0 to 3, respectively. Furthermore, when the mode selection switch SW2 is in the single or multiple exposure mode, the program indicator PI is set to 0 or 1, respectively. Next, when process F4 is executed, photometry data and distance measurement data are calculated based on the photometry and distance measurement obtained from the optical system circuit. Next, in process F8, automatic focus adjustment is performed and branching occurs according to the value of the program indicator PI, and when program indicator PI=0, branching process F5 is executed from the path shown by the dotted line according to the conventional example. In branch processing F5, it is determined whether or not the release button 11 has been fully pressed. If it has not been pressed fully, branch processing F0 is executed, and in branch processing F0, release button 1 is
1 has been restored. In other words, branch processing F5
and F0 to monitor whether the release button 11 is fully pressed or recovered.

When it is confirmed in branch processing F5 that the release button 11 is fully pressed, an exposure subroutine F6 is executed. When the exposure subroutine F6 is executed, the shutter shown in FIG.
The lens drive IC 13 operates under the control of the CPU 20,
The shutter/lens drive IC 13 drives the lens aperture 12. Exposure is performed according to the branch of PI. When PI=1, a predetermined number of exposure operations are performed, and when PI=0, a single exposure operation is performed. When exposure is completed, all data is initialized and processing F7 is executed. In process F7, the battery switch 16 shown in FIG. 2 is restored.

When the program indicator PI=1, regardless of whether the program tag PT is 1 to 3, the depth priority subroutine F9 is executed after automatic focus adjustment is performed. When the depth priority subroutine F9 is executed, the aperture priority program is forcibly set and a small aperture value is set. If this state is within the TV value interlock, the camera waits for the release button 11 to be fully pressed, and when the release button 11 is fully pressed, the exposure subroutine F6 is executed. When photographing is abandoned and the release button 11 is recovered from being pressed halfway, branch processing F11 to processing F7 are executed.

Depth priority subroutine F in branch processing F10
When it is determined that the small aperture value set in step 9 is not linked to the TV value, processing F12 is executed, and an insufficient exposure value is displayed on the liquid crystal display section 8 shown in FIG. This display continues until the release button 11 is restored in branch processing F13.

The aperture value setting program 22 in another embodiment includes an aperture value shift subroutine F23 and a branch process F23.
At step 24, it is determined whether or not to execute the exposure subroutine F20 based on the aperture value X of the aperture value AV and the camera shake exposure time Y value of the exposure time TV.

The branch process that has the same function in the aperture value setting program 21 and the aperture value setting program 22 described above is F1.
and F15 (pressing the release button halfway), F5 and F20 (pressing the release button fully), F11 and F25, and F13 and F27
, F0 and F23 (release button restoration). Also, the same function processing is F2 and F16 (power hold), F4 and F18 (photometry/distance measurement), F8 and F19 (auto focus adjustment)
, F7 and F22 (power off). Furthermore, subroutines with the same function are F6 and F21 (exposure subroutine).

When the aperture value setting program 22 is started and the selection switch subroutine F17 is executed from branch processing F15 (release button halfway pressed) to processing F16 (power hold and check), the selection switch subroutine F17 executes the steps shown in FIG. Mode selection switch SW shown in Figure 2
The numerical value of the program indicator PI is set to 0 or 1 depending on the position of No. 2. PI=1 when the position is in multiple exposure mode, PI= when in single exposure mode
Set to 0.

Next, F18 (photometry and distance measurement), F19 (
(Auto focus adjustment) and program indicator PI
When is 0, branch processing F20 (full press of release button 11), exposure subroutine F21, and processing F22 (power off) are executed. When PI=1, the aperture value shift subroutine F23 is executed. Aperture value shift subroutine F
When step 23 is executed, when the subject brightness calculated in process F18 is bright, the AV value shifts in the aperture direction to a certain aperture value X, and the aperture does not become smaller than the aperture value X. When the brightness of the subject is dark, the aperture value is shifted to an aperture value of X or less. When the aperture value is shifted to the aperture value X of the aperture value AV, when the exposure time corresponding to that aperture value X exceeds the exposure time Y of the TV,
If it is longer than the camera shake value Y, execute process F26 and process F2.
Press 6 to display a hand wave warning. The hand gesture warning display in process F26 is performed on the liquid crystal display 8 shown in FIGS. 1 and 2. The hand gesture warning display continues until recovery of the release button 11 is confirmed in branch processing F27.

If the exposure time TV is shorter than the camera shake value Y, branch processing F20 and F25 wait for the release button 11 to be fully pressed, and when the release button 11 is fully pressed, the exposure subroutine F21 is executed. At this time, the number of exposures is a predetermined number when PI=1, and the number of exposures is a predetermined number when PI=0.
This will be a single exposure. Further, when the release button 11 is restored, processing F22 is executed.

In the camera configured as described above, when the exposure program selection switch SW1 is in the depth of field priority program position and the mode selection switch SW2 is in the multiple exposure mode position, pressing the release button 11 halfway will cause the exposure shown in FIG. In the selection switch subroutine F2 of the aperture value setting program 21, PI=1 and PT=3 are set. PI is 1
When PT is set to 3, the depth priority subroutine F9 is executed, and if the TV value is within the linkage, branch processing F5 and F1 are executed.
1, the camera waits for the release button 11 to be fully pressed. Release button 1
When 1 is fully pressed, the exposure subroutine F6 is executed.

When the camera shake value of the set exposure time TV is Y at the small aperture value X of the set aperture value AV, the aperture value setting program 22 of FIG. 4 is executed, and the selection switch subroutine F17 is executed.
Check the position of the mode selection switch SW2, and set PI=1 when in multiple exposure mode. In this case, the position of the exposure program selection switch SW1 is invalid. When PI=1, the aperture value shift subroutine F23 is executed. When the brightness of the subject is bright, the aperture can be stopped down to a small aperture value of X, but the aperture cannot be reduced to a smaller aperture value than X. If the exposure time TV at this time is shorter than the camera shake value Y, the process waits for the release button 11 to be fully pressed in branch processes F20 and F28, and if it is longer, the camera shake warning is displayed in process F26, and the process waits for the release button 11 to be restored in the branch process F27. .

Note that the liquid crystal display 8 may be configured to be visible from the viewfinder 6 so that the warning display can be seen by the photographer.

[0025]

Effects of the Invention The camera according to the present invention includes: exposure program selection means for selecting an optimal exposure program from a plurality of exposure programs including an aperture value priority program; mode selection means for selecting a single exposure mode and a multiple exposure mode; When the multiple exposure mode is selected by the multiple exposure mode selection means, the exposure program selected by the exposure program selection means is forcibly set to a small aperture priority program. By programming the opening/closing to the slow side and the depth of field to the deep side, errors are reduced due to the high-speed operation of mechanical elements.
Even when photographing a continuously moving subject, it is possible to capture a clear image with even brightness of the subject.

The camera according to the present invention also includes an exposure program selection means for selecting an optimal exposure program for calculating an optimal combination of exposure time and aperture value from a plurality of exposure programs including an aperture value priority program, and a single exposure mode. and a mode selection means for selecting a multiple exposure mode, and an exposure time of the other determined by the exposure program selection means is shorter than one exposure time predetermined according to the number of multiple exposures in the multiple exposure mode selected by the mode selection means. and an aperture value shift program means for sequentially reducing the aperture value until the exposure time of the other one reaches the exposure time of one, and further comprises an aperture value shift program means for decreasing the aperture value shifted by the aperture value shift program means. Since the camera is configured with a camera shake warning display program means that displays a camera shake warning when the time exceeds a predetermined exposure time, when the multiple exposure mode is selected by the mode selection means, the aperture value and exposure time are each set to a small aperture. This has the effect of suppressing operational errors of mechanical elements due to opening and closing of the shutter within a desired operational error range, and displaying a camera shake warning when the camera shake value is exceeded.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a camera according to the present invention.

[
FIG. 2: Block diagram of a camera according to the invention

[Fig. 3] Flowchart of a small aperture value setting program built into the camera according to the present invention.

FIG. 4 is a flowchart of an aperture value setting program showing another embodiment built into the camera according to the present invention.

[Explanation of symbols] SW1: Exposure program selection switch (exposure program selection means) SW2: Mode selection switch (mode selection means)
22... Aperture value setting program (aperture value shift program means) 21... Aperture value setting program (aperture value priority program means) F23... Aperture value shift subroutine (aperture value shift program means) F26. ... Hand shake warning processing (hand shake warning display program means)

Claims (3)

[Claims] 1. Exposure program selection means for selecting an optimal exposure program from a plurality of exposure programs including an aperture priority program; mode selection means for selecting a single exposure mode and a multiple exposure mode; and the multiple exposure mode selection means. and aperture value priority program setting means for forcibly setting the exposure program selected by the exposure program selection means to a small aperture value priority program when a multiple exposure mode is selected. 2. Exposure program selection means for selecting an optimal exposure program for calculating an optimal combination of exposure time and aperture value from a plurality of exposure programs including an aperture value priority program, and selecting a single exposure mode and a multiple exposure mode. a mode selection means for selecting a multiple exposure mode selected by the mode selection means; A camera comprising: an aperture value shift program means for sequentially reducing the aperture value until the exposure time reaches the one exposure time. 3. A hand shake warning display program means for displaying a hand shake warning when the exposure time for the aperture value shifted by the aperture value shift program means exceeds a predetermined exposure time. The camera described in item 2.