JP3087084B2 - camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera for performing a photographing process by setting an exposure program selected by an exposure program selecting means as an aperture value priority program when a multiple exposure mode is selected.

[0002]

2. Description of the Related Art Some conventional cameras allow selection between a single exposure mode and a multiple exposure mode.

In the case of the multiple exposure mode, it is necessary to determine the exposure amount for each exposure so that the exposure amount by the total exposure operation becomes an appropriate exposure. That is, in the case of three multiple exposures, it is desirable to set the exposure amount for one exposure to one third.

In order to reduce the exposure amount in the multiple exposure mode, it is general to open and close the shutter at a higher speed than in the single exposure mode. However, when the shutter opening / closing transitions to the high-speed side, the exposure operation deviates from the nominal exposure time due to an operation error of a mechanical element. This deviation from the nominal exposure time not only affects the total exposure amount, but also when the continuously moving subject is photographed in the multiple exposure mode, the first exposure amount and the second and subsequent exposure amounts When there is a difference, the brightness of the subject becomes uneven and the picture becomes unsightly,
There is a drawback that correction cannot be made depending on the development printing time.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks. When the multiple exposure mode is selected by the mode selection means, the depth of field is programmed to be deeper, and the error caused by the high-speed operation of the mechanical element is achieved. It is an object of the present invention to provide a camera capable of capturing a clear image without unevenness in brightness of the subject even when a continuously moving subject is photographed due to the decrease of the image.

[0006]

The camera according to the present invention comprises:
An exposure program selecting means for selecting an optimal exposure program from a plurality of exposure programs including a depth priority mode; a mode selecting means for selecting a single exposure mode and a multiple exposure mode; and a case where a multiple exposure mode is selected by the mode selecting means. A depth priority mode in which the exposure program selected by the exposure program selection means is set as an aperture value priority program.

[0007]

FIG. 1 shows an embodiment of a camera according to the present invention.
4 will be described in detail.

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 upper surface of the main body 1 of the camera. The main body 1 has a light receiving section 5 and a light emitting section 4.
An AF unit 3, a finder 6, and a strobe 7 are mounted on the front and a lens barrel 2 is provided.

As shown in FIG. 2, the light receiving section 5 and the light projecting section 4 of the AF unit 3 are connected to a CPU 20 via an AF interface 14 having an A / D conversion function and an electric / light conversion function. 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 a manual exposure mode, a normal exposure mode, a high-speed exposure mode, and a depth priority mode. And
The selected exposure program control is displayed on the liquid crystal display 8. When the mode selection switch SW2 is pressed,
One of the single exposure mode and the multiple exposure mode is selected, and the selected mode is displayed on the liquid crystal display 8.

Further, the release button 11 connected to the CPU 20 is a two-stage operation switch, and the battery switch 16 is closed by one-stage operation to connect the battery 15 to the CPU 20. When the battery 15 is connected to the CPU 20, the battery capacity is checked, and if there is no predetermined capacity, a display indicating that the battery capacity is insufficient is displayed on the liquid crystal display 8. A with the battery 15 connected to the CPU 20
Photometry and distance measurement are performed by an optical system circuit including the light receiving unit 5 and the light projecting unit 4 of the F unit 3, and an arithmetic circuit provided in the CPU 20 calculates the photometry data and the distance measurement data. When the calculation is completed, C
The PU 20 controls the shutter opening 12 and the lens 2 a of the lens barrel 2 via the shutter / lens drive IC 13.

The CPU 20 is provided with an aperture value setting program 21 shown in FIG. The aperture value setting program 21 determines whether or not the release button 11 has been half-pressed.
When the release button 11 is pressed halfway, the battery switch 16 shown in FIG. 2 is closed and the battery 15 is supplied. The power of the battery 15 is held in process F2, and the battery capacity is checked. Next, the selection switch subroutine F3 is executed. The selection switch subroutine F3 is a subroutine for determining a branch destination of the program according to the positions of the exposure program selection switch SW1 and the mode selection switch SW2. When the position of the exposure program selection switch SW1 is a manual exposure mode, a normal exposure mode, a high-speed exposure mode, or a depth priority mode, the program tags are set to 0 to 3, respectively.
When the position of the mode selection switch SW2 is in the single or multiple exposure mode, the program indicator PI
Are set to 0 or 1, respectively. Next, when the process F4 is executed, the photometry data and the distance measurement data are calculated based on the photometry and the distance measurement obtained from the optical system circuit. Next, in process F8, automatic focus adjustment is performed and branching is performed in accordance with the value of the program indicator PI.
Execute In the branching process F5, it is determined whether or not the release button 11 is fully pressed.
0, and it is determined whether or not the release button 11 has been restored in the branching process F0. That is, in the branching processes F5 and F0, it is monitored whether the release button 11 is fully pressed or restored.

When the release button 11 is fully pressed in the branching process F5, 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 the exposure is completed, all data is initialized, and the process F7 is executed. In process F7, the battery switch 16 shown in FIG. 2 is restored.

When the program indicator PI = 1, the depth priority subroutine F9 is executed after the automatic focus adjustment is performed regardless of whether the program tag PT is 1 to 3. When the depth priority subroutine F9 is executed, the aperture priority program is forcibly set, and according to the number of multiple exposures,
Exposure program selection means from one of the predetermined exposure times
When the other exposure time is short when the other exposure time is one
Aperture to gradually reduce aperture value until exposure time reaches
Value is set. If this state is within the interlocking of the TV value, the release button 11 is fully pressed, and if the release button 11 is fully pressed, the exposure subroutine F6 is executed. When the photographing is abandoned and the release button 11 is restored from the half-pressed state, the branching processes F11 to F7 are executed.

In a branching process F10, a depth priority subroutine F
When it is determined that the aperture value set in step 9 is not linked to the TV value, a process F12 is executed, and the liquid crystal display unit 8 shown in FIG. This display is continued until the release button 11 is restored in the branching process F13.

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

[0016]

The camera according to the present invention has an exposure program selecting means for selecting an optimal exposure program from a plurality of exposure programs including a depth priority mode, a mode selecting means for selecting a single exposure mode and a multiple exposure mode, and a mode. When the multiple exposure mode is selected by the selection means, the exposure program selected by the exposure program selection means is provided with a depth priority mode in which the aperture value priority program is set. Since the shutter can be opened and closed at a low speed by reducing the error caused by the high-speed operation of the mechanical elements, even if a continuously moving subject is photographed, a clear image with uniform brightness of the subject can be taken. There is an effect that can be achieved.

[Brief description of the drawings]

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

FIG. 2 is a block diagram of a camera according to the present invention.

FIG. 3 is a flowchart of a small aperture value setting program built in 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) 21: Aperture value setting program (aperture value priority program means)

Continuing on the front page (72) Inventor Kenichi Watanabe 934-13 Kadawato, Yokkaido, Chiba Prefecture Inside Seikosha Chiba Works Co., Ltd. (56) reference Patent Sho 59-195631 (JP, a) JP Akira 61-156234 (JP, a) JP Akira 59-197023 (JP, a) (58 ) investigated the field (Int.Cl. ⁷ G03B 7/00-7/28

Claims (1)

(57) [Claims] 1. An exposure program selecting means for selecting an optimum exposure program from a plurality of exposure programs including a depth priority mode; a mode selecting means for selecting a single exposure mode or a multiple exposure mode; A camera having a depth priority mode for setting an exposure program selected by the exposure program selection means to an aperture value priority program when a mode is selected.