JPH0440432A - Camera - Google Patents

Abstract

PURPOSE:To attain an easy-to-use camera whenever still and moving objects are AEB-photographed by providing a photographing mode selecting means by which a photographer freely selects photographing (AEB-photographing) that an exposure value is automatically changed in step an every exposing actions, single photographing, and consecutive photographing. CONSTITUTION:When the AEB-photographing and single photographing are selected, a prescribed number of the AEB-photographing is consecutively carried out in response to only one releasing operation. When the AEB-photographing and consecutive photographing are selected, the AEB-photographing is consecutively carried out only while a releasing button is depressed. Therefore, when the still object is AEB-photographed, a single photographing mode is selected and the one-shot operation of the releasing button is carried out. On the other hand, when the moving object is AEB-photographed, a consecutive photographing mode is selected, so that the AEB-photographing is carried out only while the releasing button is depressed. Thus, an operation for carrying out the AEB- photographing of the still object is easy, and moreover, a photograph with a proper exposure can be taken without missing a shutter chance even during the AEB-photographing of the moving object.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a camera configured to perform AEB photography (automatic stepwise exposure photography), and in particular, in addition to the AEB photography function, it can also perform single shooting (by pressing the release button). Once the release button is released, the next release will not be possible until you stop pressing the release button.・Shooting mode) and continuous shooting (releases will be performed continuously while the release button is held down, and will not be released again until you stop pressing the release button. The present invention relates to a camera that is configured to enable a shooting mode in which the release is canceled.

[Conventional technology] Modern cameras are highly electronically controlled. For example, the camera is configured to automatically perform shooting techniques that were previously performed by professional photographers with the touch of a button. There are also more cameras.

The camera manufactured and sold by the present applicant is one of such highly electronically controlled cameras, and is equipped with a well-known AEB photographing function.

The AEB photography function is, for example, a function that continuously and automatically performs photography with an appropriate exposure value, photography with overexposure, and photography with underexposure in this order.

There are two types of known AEB imaging devices as described below, and these two types of devices are installed separately for each camera model.

The first AEB device operates in such a way that during AEB shooting, even in single-shot mode, a set number of shots are taken consecutively by pressing the release button once, and the second AEB device
When in continuous shooting mode, the device operates the shutter only while the release button is pressed, and continuously shoots A during this time.
This mode of operation is to perform EB photography, and when in single-shot mode, release the release button once and press it again to proceed to the next AEB exposure.

Conventionally, the AEB device of the first operating type and the AEII device of the second operating type have not been mounted on the same camera.

On the other hand, conventional cameras have a single shooting mode (a shooting mode in which the release button is pressed once and the next release is not possible until you stop pressing the release button), and a continuous shooting mode (the release button Some models have a shooting mode in which the release is performed continuously only while the release button is held down, and the release is stopped only when the release button is stopped being pressed, while others have both functions.

[Problems to be Solved by the Invention] Two types of known cameras having an AEB photography function have the following problems.

Generally, when taking AEB photographs of still objects such as landscapes, it is more convenient to use the AEB camera for a set number of consecutive exposures with one release; however, on the other hand, when taking AEB photographs of moving objects, It is more convenient to use and makes it easier to capture photo opportunities if the shutter can only be released while the button is pressed.

This is because when shooting a moving object, if AEB exposure is performed continuously for the set number of images in one release, even if a good photo opportunity appears during AEB exposure and you want to release the shutter, you will not be able to release the shutter. This is because you will miss out on opportunities.

That is, the above-mentioned known first type camera (first AE
Cameras with B shooting function) can shoot static subjects using AE.
B #g1 Suitable for shooting shadows, but unsuitable for shooting moving subjects, and the second type of camera mentioned above (camera with a second AEB shooting function)
Although it is suitable for photographing moving subjects, it is difficult to use when photographing static subjects.

Therefore, an object of the present invention is to provide an easy-to-use camera for both AEB photography of static objects and moving objects, and to take photographs with optimal exposure without missing a shutter opportunity when photographing moving objects with AEB. Our goal is to provide an improved camera that can

[Means for Solving the Problems] The camera according to the present invention has an AEB shooting function, a single shooting function, and a continuous shooting function, and when AEB shooting and single shooting are selected, only one release operation is required. means for continuously performing AEB photography for a predetermined number of images depending on the situation, and means for continuously performing AEB photography only while the release button is pressed when AEB photography and continuous photography are selected. It is characterized by That is, since the camera of the present invention is equipped with a single-shot AEB photography function and a continuous-shot AEB photography function, the camera can be used for both AEB photography of a stationary subject and AEB photography of a moving subject.

[Operation] By selecting the single-shot mode when photographing a stationary subject and selecting the continuous-shot mode when photographing a moving subject, camera users are provided with ease of use suitable for each case. Further, even during tracking AEB photography of a moving object, it is possible to take a photograph with proper exposure without missing a photo opportunity.

[Embodiments] Examples of the present invention will be described below with reference to the drawings. FIG. 2 is a schematic diagram of the electrical configuration of a camera according to the present invention.

In FIG. 2, 1 is a microcomputer that controls the operation of the entire camera; 12 is an in-lens motor control circuit that controls the optical system drive motor (lens drive motor and aperture blade drive motor) in the lens barrel; 3 is a liquid crystal display circuit that drives the liquid crystal of the camera's liquid crystal display device; 4 is a switch sense circuit that detects the states of various detection switches; 5 is a switch sense circuit that detects the states of various detection switches;
is a strobe light emission control circuit that controls a strobe device,
6 is a focus detection circuit that detects the focus of the photographic lens; 7 is a photometering circuit that has a built-in photometry element; 8 is a shutter control circuit that controls the drive of the shutter; 9 is a feed motor that controls the film feed motor. In the control circuit, SWI is a switch that starts camera operation, SW2 is a switch that is turned on in conjunction with the pressing operation of the release button, and X contact is a switch that is turned on when the front curtain of the shutter finishes running. .

The double line drawn between the microcomputer-1 and each circuit is a serial data bus DBUS provided between the human output port of the microcomputer-1 and each of the circuits.
Data communication is performed between the microcomputer 1 and each circuit via the data bus DBLIS. Furthermore, the two-dot chain lines drawn between the microcomputer 1 and each circuit are control signals for controlling each circuit by the microcomputer 1.

The lens motor control circuit 2 is a microcomputer.
1 to tc: While receiving the OM double signal, the data bus DB
Serial communication is performed with the microcomputer-1 via US. Motor drive information is received and received through serial communication, and the motor in the lens barrel is driven and controlled using that information. At the same time, various information about the lens (focal ratio 11f
etc., l is sent to the microcomputer-1 via serial communication.

The liquid crystal display circuit 3 is a circuit for driving a liquid crystal display (not shown) for informing the photographer of various photographic information of the camera, such as shutter speed, aperture value, ISO sensitivity, number of film sheets, etc. 3 performs serial communication with the microcomputer-1 via the data bus DBIIS while receiving the DPGOM signal from the microcomputer-1. Display data is received and received through serial communication, and the liquid crystal display is driven according to the data.

The switch sense circuit 4 is a circuit that reads the status of the switch used by the photographer to set various photographing conditions and the status of the switch indicating the status of the camera and sends it to the microcomputer-1.
While receiving the SWCOM signal from the microcomputer-1, switch data is sent to the microcomputer-1 through serial communication via the data bus DBUS.

The strobe light emission control circuit 5 controls strobe light emission and TTL.
This is a circuit that controls the light emission stop function by dimming, and while the circuit 5 is receiving the STCOM signal from the microcomputer 1, it performs serial communication with the microcomputer 1 via the data bus DBUS, and transmits data related to strobe control. The receiver receives and performs various controls on the strobe device.

The focus detection circuit 6 is a line sensor for performing AF using the existing phase difference detection method, and a circuit unit for reading out the accumulation thereof, and is controlled by the microcomputer-1.

The photometry circuit 7 measures the light of the subject, and outputs the photometry output under the control of the microcomputer 1.
send to The microcomputer 1 A/D converts the sent photometric output and uses it to set exposure conditions (aperture, shutter speed).

The shutter control circuit 8 controls the movement of the leading and trailing shutter curtains (not shown) in accordance with control signals from the microcomputer 1.

The feeding circuit 9 feeds (winds and rewinds) the film in accordance with control signals from the microcomputer-1.

The switch SWI is a switch that is linked to a button that starts the operation of the camera, and when the microcomputer-1 recognizes that the switch SWI has been turned on, the microcomputer-1 starts photometry, distance measurement, and display.

Switch SW2 is linked to the camera's release button.
When the microcomputer 1 recognizes that SW2 has been turned on, the exposure operation starts.

The X contact turns ON when the shutter's first curtain completes its travel.
L, serves to notify the strobe light emission control circuit 5 of the timing of strobe light emission.

Next, the operation of the camera of this embodiment will be explained with reference to the flowchart of FIG. 1 and FIGS. 3 to 5.

(101): First, the power supply is microcomputer-1
It is determined whether the switch SWI is in the OFF state or the ON state while the switch SWI is connected to the OFF state. Here, if the switch SWI is in the OFF state, the power supply is set to 0FFL, and if the switch SWI is in the ON state, proceed to (102).
Performs photometry and distance measurement.

(102): Photometry/distance measurement and calculation (103): After photometry/distance measurement, switch SW2 is turned OFF.
It is determined whether it is in the F state or the ON state. If the switch SW2 is in the OFF state, (104) NO SWITCH ON10FF is determined, and the switch SW2 is in the OFF state.
If W2 is in the ON state, the process moves to the release sequence after (105).

(104): ON1 of switch SW2 in (103)
If the switch SW2 is in the OFF state in the 0FF determination, it is determined whether the switch SWI is in the OFF state or in the ON state. If switch SWI is OFF,
When the power is 0FFL and the switch SWI is ON, (10
Return to 2) photometry/distance measurement.

(105): The appropriate value calculated in (102) (
Aperture value and shutter speed value to obtain proper exposure)
, the aperture value takes into account the amount of correction set in AEB.
Set the shutter speed value. AEB correction is ±
FIG. 3 shows an example 1 in which three images including the appropriate one are taken in one stage. FIG. 4 shows an example 2 in which the AEB is corrected in one step, only the underside is corrected, and four shots are taken, including the appropriate one. In the case of Example 1 shown in FIG. 3, <-1>, <appropriate>.

<Village>, <-1>, <Appropriate>, <+t
>, <-1>... continue until AEB is released. In addition, in the case of Example 2 shown in Figure 4, <appropriate>, <
-1>.

(-2>, <-3>, <appropriate),
<-1>, <-2>.

(-3>, <appropriate>, etc. are continued until 8EB is released.<appropriate> is an exposure value based on the photometric value determined by the latest photometry.

Exposure is performed using the aperture value and shutter speed determined in (101i) + (105).

(107): Here, the feeding mode is either single shooting mode (a mode in which the release button is pressed once and the next release cannot be performed until the release button is released), or continuous shooting mode (the release button is held down continuously). If the mode is continuous shooting mode, the mode returns to the beginning (101), and if it is single shooting mode, the AEB is set with one release. Proceed to step (108) so that AEB exposure is performed continuously for the number of sheets.

(108) Decrement the AEB number. The number of AEB sheets mentioned here is 3 for 81 legal and over-under cards, 5 for 82 legal and over-under cards, 7 for 3 legal and 3 over-under cards, and so on. Further, the number of cards may be 2 if there is one correct and over or under, 3 if two are correct and over or under, 4 if three are correct and over or under, and so on.

(109): Determine whether the number of AEB sheets is 0 or not,
When it is 0, the release sequence is finished and the first (10
Returning to step 1), if it is not 0, perform the AEB processing in (105) and then perform the exposure in (106) to continue AEB photography.

The table in Figure 5 shows when the feeding mode is single shooting mode (a mode in which the release button is pressed once and the next release is not possible until the release button is released) and continuous shooting mode (in which the feed mode is continuous shooting mode (when the release button is held down). This shows how the AEB processing differs depending on whether switch SW2 (release button) is ON or OFF when the camera is in a mode where the camera continues to release the camera and stops only when the release button is released. .

From the table, when the feeding mode is continuous shooting, turn on switch SW2.
If you do this, you will be able to release the camera and know that it is strong against photo opportunities. The AEB processing at this time is as shown in the table. Next, when the feed mode is single shot, when the release is started by turning on the switch SW2, you will not be able to take the picture at the desired position even if you turn on the switch SW2 until the AE 8 has been taken, but with one release AE continuously for the set number of sheets
Since the camera uses B exposure, you will no longer have to worry about holding down the release button when taking AEB shots of still objects.

[Effects of the Invention] As explained above, in the camera according to the present invention, when taking an AEB photograph of a still subject, by selecting the single-shot mode, the user only needs to operate the release button once. Furthermore, when performing AEB photography of a moving subject, by selecting continuous photography mode, AE11 photography is performed while the release button is pressed. Therefore, with the camera of the present invention, not only is the operation easy when performing AEB photography of a stationary subject, but also a photograph with proper exposure can be taken without missing a photo opportunity even during AEB photography of a moving subject.

[Brief explanation of the drawing]

Fig. 1 is a flowchart showing the characteristic operation of the camera of the present invention, Fig. 2 is a schematic diagram showing the electrical configuration of the camera of the invention, and Figs. 3 and 4 show the shooting conditions for AEB shooting. The diagram shown in FIG. 5 is a diagram showing the relationship between switch SW2 and AEB photography in the camera of the present invention. 1... Microcomputer 2... In-lens motor control circuit 3... Liquid crystal display circuit 4... Switch sense circuit 5... Strobe light emission control circuit 6... Focus detection circuit 7...・Photometering circuit 8...Shutter control circuit 9...Feeding motor control circuit and 4 others

Claims (1)

[Claims] 1. A means for performing AEB photography (photography in which the exposure value is automatically changed step by step each time an exposure operation is performed), and a means for performing single photography (pressing the release button to release the camera once and then pressing the release button); A method for performing continuous shooting (a shooting in which the next release is prohibited until the release button is stopped) and continuous shooting (a shooting in which the release continues as long as the release button is held down, and the release is stopped only when the release button is stopped being pressed). a shooting mode selection means that allows the photographer to freely select AEB shooting, single shooting, and continuous shooting; and a shooting mode selection device that allows the photographer to freely select AEB shooting, single shooting, and continuous shooting; A camera characterized by having means for performing AEB photography, and means for causing AEB photography to be performed continuously only while a release button is pressed when AEB photography and continuous photography are selected. . 2. A means for performing AEB photography, a means for performing single photography, a means for performing continuous photography, a photography mode selection means for automatically selecting either single photography or continuous photography, and AEB photography.
When shooting and single shooting are selected, AEB shooting is performed for a predetermined number of consecutive images in response to a single release operation, and when AEB shooting and continuous shooting are selected, AEB shooting is performed only while the release button is pressed. A camera characterized in that it has a means for continuously taking pictures.