JPH0652367B2 - Exposure display for camera - Google Patents

Description

The present invention relates to an exposure display device for a camera, which displays exposure information of a camera, in particular, an automatic exposure control camera.

Conventionally, as the exposure information display of the camera, the aperture value, the shutter speed value, or both are indicated on the scale plate by the pointer of the ammeter or the light emitting diode, or the numerical display is performed by the light emitting diode of 7 segments. It is difficult for the photographer to judge the information, and it is troublesome to change the aperture value or the shutter speed depending on the photographing intention.

In addition, the program type automatic exposure control camera is convenient because even a beginner can easily take a picture, but generally, it does not display how the aperture value and the shutter speed are combined, so the picture taking result is estimated. It was difficult.

The present invention has been made for the purpose of making it possible to understand at a glance what the shooting conditions are, such as the aperture value and the shutter-speed value, and the positioning thereof, from at least one of the above situations. Among the exposure control programs, a dot matrix display device in which a plurality of dot display portions are arranged in a matrix for displaying all combinations of shutter speed and aperture value of the selected exposure control program as a program diagram, Among the dot display units corresponding to all combinations of aperture value and shutter speed of the selected exposure control program, the dot display units corresponding to the combination of aperture value and shutter speed selected based on the photometry result are A dew for a camera, comprising: a display driving device that is driven in a display state different from that of a dot display unit. There is provided a display device.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a display structure of one embodiment. 1 is a dot matrix display element. In the horizontal axis direction, a series of shutter speed values of 2 for each step, 11 steps from 1 to 1/1000 seconds,
In the vertical axis direction, a series of aperture values 3 of F1.4 to F22
The 9 × 11 dot-matrix display element 1 is constituted by the above 9 steps. Now, assuming that the horizontal axis is the row and the vertical axis is the column, FIG. 1 has a matrix configuration of 9 rows and 11 columns.
= 1.4 and T = 1 as the base points of rows and columns, (1.1) is F = 1.
4, T = 1, and (9,11) means F = 22 and T = 1/1000. Therefore, when the display element is electrically turned on for display, the dot matrix display element can display various patterns by turning on the designated display element when the row and column are designated. .

That is, the signal lines corresponding to the numbers of rows and columns are provided,
By connecting the display elements to the signal lines corresponding to 1 to 9 rows and the signal lines corresponding to 1 to 11 columns and giving a lighting signal to the signal lines corresponding to the rows and columns of the display elements to be lighted, Lighting control can be performed.

The scanning circuit is provided with a plurality of scanning lines as signal lines corresponding to the rows, and the scanning lines sequentially from the scanning line corresponding to the first row to the scanning line corresponding to the last row as the lighting signal at a constant cycle. The lighting pulse signal is repeatedly output.

Further, a periodic line is connected to the display memory circuit in order to synchronize with a display memory circuit which will be described later, and a synchronizing signal is output to the synchronizing line in synchronization with the output of the lighting pulse signal.

The display memory circuit includes a plurality of lighting signal lines as signal lines corresponding to the columns.

In the lighting signal line, lighting information is read from the memory in response to a synchronization signal output from the scanning circuit as the lighting signal, and the lighting signal line corresponding to the first column to the lighting signal line corresponding to the last column is read. The lighting information is converted into a lighting pulse signal and output.

Also, a plurality of control lines are connected to the control circuit in order to obtain control information from the control circuit described later.

Note that the memory stores lighting information regarding a plurality of preset automatic exposure control modes, and only the lighting information of the automatic exposure control mode selected by inputting mode information, which is one of the control information, from the control circuit. Can be read. The control circuit outputs various control information to the display memory circuit. As the control information, in addition to the mode information indicating the automatic exposure control mode selected by the photographer, there is exposure information indicating an aperture value or a shutter speed value that is manually set or is determined by automatic exposure control according to the photometric amount. . When the exposure information is output to the display memory circuit, it is determined whether the exposure information is manually set in the control circuit, and if the exposure information is the exposure information determined by the automatic exposure control, the blinking information is displayed at the same time. Output.

This blinking information is for blinking display. When the blinking information is input to the display memory circuit, the display memory circuit causes the lighting pulse signal having a large cycle different from the cycle of the synchronization signal output from the scanning circuit. Is output to the lighting signal line. Therefore, to the human eye, the display that seems to be kept lit up until now appears to be blinking, and as a result, the exposure information is blinked.

Further, the anodes and cathodes of the plurality of display elements (chips) are connected to the scanning line and the lighting signal line corresponding to the common row and column, respectively, and when a lighting pulse signal is obtained for both the scanning line and the lighting signal line. It is supposed to light up.

In the above configuration, when the photographer operates the mode selection means (not shown) to select one of the automatic exposure modes, the mode information corresponding to the selected mode is output from the control circuit to the display memory circuit. The scanning circuit and the display memory circuit start operating, and the scanning circuit outputs a lighting pulse signal to the scanning line and also outputs a synchronizing signal to the display memory circuit.

The display memory circuit reads the lighting information corresponding to the selected mode from the memory by inputting the synchronization signal, and outputs the lighting pulse signal to the lighting signal line, as shown in FIG.
(C), the display as shown by the diagonal lines in FIGS. 4 (a) and 4 (b) is displayed by turning on the display element.

When the exposure information is input to the control circuit from the automatic exposure control circuit (not shown) in this state, the control circuit outputs the exposure information together with the blinking information to the display memory circuit, and the display memory circuit displays the mode information. Since the lighting pulse signal is output to the lighting control line at different cycles, the exposure information is displayed in a blinking manner.

When the manual mode is selected, there is no lighting information of the exposure information stored in the memory of the display memory circuit, so the exposure information set by the exposure information setting means (not shown) is input through the control circuit to the lighting pulse signal. It is converted and displayed. At this time, since the blinking information is not output from the control circuit, the display is turned on as shown in FIG. 3 (a).

Examples of the dot matrix display element include a light emitting diode, a fluorescent display tube, and a non-emission type liquid crystal display, an electrochromic display element, and the like, all of which can be used as the display element of the present invention. FIG. 2 shows an embodiment of a dynamic drive display circuit in the case where the dot matrix display element is composed of light emitting diodes.

By the same method, it is possible to display other display materials such as liquid crystal cells and electrochromics.

If the camera incorporating this dot matrix display element is capable of manual exposure and automatic exposure control photography in both shutter-speed priority and aperture-priority modes, the shutter-speed value and aperture value At the coordinates of the dot-matrix display element as shown in FIG. 1, the light is turned on as shown in FIG. In FIG. 3A, the aperture value is F8 and the shutter speed value is 1/125.
Seconds.

Also, when using the automatic exposure control shooting in aperture priority mode,
The set aperture value (F8 in this example) is turned on regardless of the shutter speed value.

This is shown in FIG. 3 (b). Further, in order to show the shutter speed value at the time of shooting determined by the automatic exposure control according to the photometric amount, the place is displayed by blinking and lighting.

The display example of FIG. 3B is a display when the aperture value is set to F8 and a subject having the light amount EV13 (value in the apex method) is photographed by the aperture priority automatic exposure control. At this time, the shutter speed value that is automatically controlled is 1/125 seconds, all rows of aperture value F8 are lit, and only the coordinates of F8 and 1/125 seconds are lit and blinked.

Of course, the lighting and the blinking lighting may be reversed, and all the rows of F8 may blink and light up, and only the coordinates of F8 and 1/125 second may be illuminated.

Further, FIG. 3C shows a display example when the automatic exposure control shooting is performed in the shutter-speed priority mode.

In this case, the set shutter speed value (1/1 in this example)
All the columns of (125 seconds) are turned on, and the location of the aperture value (F8, 1/125 seconds in this example) where the photometric amount can be obtained blinks. As described above, in the camera provided with the exposure display device of the present invention, the shooting mode can be determined at a glance, and more accurate exposure information can be obtained.

This advantage is more effective in the case of programmable automatic exposure control photography. The advantage of programmable automatic exposure control is
Although it is convenient for beginners to take a safe photo just by pressing the release button, if a high-level exposure is required such as a photo that suits the shooting intention or a special photo, the exposure built into the camera If the photographer does not have the program stored in memory or has a memo in his / her possession, the combination of the aperture value and shutter-speed value corresponding to the photometric amount cannot be known.

For this reason, even when the exposure program mode is appropriate, shooting is performed in shutter speed priority, aperture priority, and manual mode, which are complicated to set.

However, by displaying the exposure program and the exposure value set at the time of shooting using the dot matrix display element as in the present invention, the above-mentioned drawbacks are solved. Figure 4 (a),
(B) is an example in which this programming method is displayed. The combination of the aperture value and shutter speed value at the shaded area indicates that the exposure program is lit, and the double shaded area indicates the aperture value and shutter speed value at the time of shooting when the photometry is possible. Light.

As described above, according to the present invention, by displaying the program diagram of the automatic exposure control program for controlling the aperture and the shutter speed, the aperture value and the shutter speed value at the time of shooting are displayed. The effect is that it is possible to grasp the change amount and easily determine the change amount even when the exposure amount is changed according to the intention of shooting.

In the display device using the dot matrix used in the present invention, part of the dot matrix may be colored to add a camera shake warning or the like.

It is also possible to add a battery check, a brightness warning, etc. by using the unused dot portion. Further, in the present embodiment, the shutter speed value is taken in the horizontal axis direction and the aperture value is taken in the vertical axis direction, but it is also possible to display the matrix in the opposite way.

[Brief description of drawings]

FIG. 1 shows a display structure according to an embodiment of the present invention, and FIG. 2 shows a dynamic drive display circuit of a dot matrix display element of a light emitting diode. FIG. 3 and FIG. 4 show display examples of various shooting modes by dot matrix. 1 ... Dot matrix display element 2 ... Shutter-speed value 3 ... Aperture value

Claims (1)

[Claims] 1. A plurality of dot display sections are arranged in a matrix form to display, as a program diagram, all combinations of shutter speed and aperture value of a selected exposure control program among at least two exposure control programs. Dot matrix display device, and dot corresponding to all combinations of aperture value and shutter speed of the selected exposure control program, corresponding to combinations of aperture value and shutter speed selected based on the photometry result. An exposure display device for a camera, comprising: a display drive device for driving the display part in a display state different from that of other dot display parts.