JPS61198139A - Display device for camera - Google Patents

Abstract

PURPOSE:To display film frame information in a viewfinder during averaged light metering by switching film frame information which is transmitted to a display device to respective pieces of light-metered value information by a selecting circuit when a multi-point light metering mode is selected. CONSTITUTION:When the number of frames of a loaded DX film is >=36, all decoders DCs D1-D6 send out a high level, so segment SEGs 17, 14, 11, 8, 5, and 2 illuminate to display a bar pattern showing that the remaining number of frames is >=36. When the remaining number of frames 35-30, SEGs 14, 11, 8, 5, and 2 illuminate. Further, when the remaining number of frames decreases to 0, all the decoder DCs 1-6 send out a low level, so the display of the bar pattern 16 is inhibited and a 7-segment pattern 19 displays the remaining number of film frames; when the number decreases below 3, a number flashing display begins to be made and when the remaining number becomes 0, all displays are inhibited.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to cameras, and more particularly to display devices for cameras.

<Prior art> In recent years, so-called average metering modes have been developed, such as average metering, which measures and averages light from almost the entire viewfinder field of view, or center-weighted average metering, which averages light after applying some kind of weighting, and the average metering mode, which measures and averages light from almost the entire field of view of the viewfinder, or center-weighted average metering, which averages light after applying some sort of weighting. A type of camera has been proposed that has a partial photometry (spot photometry) mode in which light is measured at a certain area, and allows the photographer to select the photometry mode. This type of camera is capable of measuring the brightness of multiple points on the screen in partial metering (spot metering) mode, making it possible to reflect the high level of artistic intent.

When multi-point photometry is enabled in this way, it is desirable to display each photometry value so that it can be confirmed at a glance, and a so-called bar graph type display is used.

On the other hand, in recent years, it has become desirable to carry out so-called continuous shooting, and there is a tendency for a motor drive device to be built into the camera. In this case, about 2 to 5 frames are taken per second, so if a 36-frame film is used, the film will be used up in about 18 to 7 seconds, and the photo opportunity will come during continuous shooting. At this time, it often happens that the entire film is consumed.

Therefore, it is desirable to be able to check the remaining amount of film in the viewfinder during continuous shooting.

However, for cameras that can switch the photometry mode, it is necessary to display multi-point photometry values as described above, and in order to display the remaining amount of film in the viewfinder in addition to this multi-point photometry value display, it is necessary to There are problems with space and because there are many displays within the same viewfinder field of view, it may become difficult to see.

<Summary of the Invention> The purpose of the present invention is to make a display device that displays multi-point photometry values as a bar graph also serve as a film frame number display when the camera mode is set to a mode other than multi-point photometry mode. The aim is to solve the above-mentioned problems.

The present invention has a structure that solves the above-mentioned problems by providing a display having a bar pattern, selectively transmitting film frame information or each photometric value in multi-point photometry mode to the display, and transmitting film frame information or each photometric value to the display. A selection circuit for displaying a bar pattern and a selection means for selecting a multi-point metering mode are provided, and film frame information transmitted to the display by the selection circuit when the multi-point metering mode is selected by the selection means. is switched to each photometric value information.

<Example> Hereinafter, the present invention will be described in detail based on Examples.

FIG. 1 is a configuration diagram showing the arrangement of a photometry system of a camera to which a display device according to the present invention is applied. In Figure 1, 1 is a photographing lens, 2 is a 45° semi-transparent main mirror, 3 is a focusing plate,
4 is a pentaprism, 5 is an eyepiece lens, 6 is a condensing lens for average photometry, 7 is a light receiving element for average photometry, 8 is a total reflection submirror, 9 is a lens system for spot photometry, and 10 is a light receiving element for spot photometry. . Since the photometry system is arranged as described above, the subject light passing through the lens 1 is imaged on the focusing plate by the main mirror 2, and this formed finder image is sent to the light receiving element 7 through the optical system 6. Average light metering is performed by measuring light at .

Also, a part of the light beam that is necessarily guided to the main mirror 2 passes through the main mirror, is reflected by the sapmite 8, and is transmitted to the optical system 9.
The light is focused by the optical system 9 and travels from only a narrow area of the screen, and then enters the 10 light receiving elements, where spot photometry is performed. With the above configuration, both average and spot photometry can be performed, and the photometry mode can be selected by selecting the output of the light receiving element 7 or 10 using a mode switching member, as will be described later.

FIG. 2 is a diagram showing the display state within one field of view of the finder in the camera shown in FIG.
2 and 13 are 7-segment displays that respectively indicate the shutter speed and aperture value, and in this embodiment are formed of LED displays. This LED display displays the exposure control value of the camera.

Reference numeral 14 denotes a bar graph pattern and 7 segment pattern display section for displaying spot photometric values and film remaining amount in each mode, and in this embodiment is formed of a liquid crystal display.

FIG. 3 is a configuration diagram showing details of the display pattern of the display section 14 in FIG. 2. Reference numeral 15 is a scale display pattern for indicating how much the photometric value obtained by spot photometry deviates from the exposure control value (the exposure value determined by the actually controlled shutter speed and aperture value). 15 in the pattern
A indicates the center position, 15B indicates 1/2 step of the photometric value, and 15C indicates 1 step of the photometric value.

Reference numeral 16 indicates a bar pattern representing a spot photometric value or a remaining amount of film depending on each mode. 17.
18 are under and over warning patterns each indicating that there is a photometric value outside the displayable range. 19 is 7
In the segment pattern, when the film is fully wound and ready for shooting, a specific pattern, "F'" in this embodiment, is displayed, and the number of remaining films is a specific number, 9 or less in this embodiment. This is a pattern for digitally displaying the number of remaining films.

Hereinafter, the display mode of the display unit 14 shown in the second diagram will be explained for each mode.

First, the spot metering mode will be explained.

In the spit photometry mode, the scale pattern 14 shown in FIG. 3 is displayed on the display section 14 (liquid crystal display) shown in FIG. When the operating member is operated in this state to perform spot photometry, the pattern shown in FIG. 3 at the position facing the finger s15 in FIG. 3 is displayed as shown in FIG. 4. That is, in the vJ spot photometry, since the spot photometry value has not been previously stored in the camera, the spot photometry value becomes the reference value, and a bar pattern facing the index 15A representing the center position is displayed. In this state, when the operating member is operated again to perform spot photometry and obtain a second spot photometry value, the camera calculates the average value of the first and second photometry values, and this value is the center value in Figure 3. The bar pattern display is moved to face the index 15A. That is, the second spot photometric value is, for example, the first spot photometric value.
15 if the brightness is two steps lower than the spot photometry value.
As shown in Fig. 5, centering on position A, place a bar pattern corresponding to the spot photometry value at position KdX1 shifted one step above, and a second spot photometer at a position shifted one step below one person. Display a bar pattern corresponding to the value. After that, when you operate the operating member and perform spot photometry values multiple times, the average value of each spot photometry value shifts to a position corresponding to 15A, and the brightness difference (deviation) of each photometry value from the average value. A bar pattern is displayed at a position corresponding to , and the difference in brightness between the photometric value of each time and the above average value can be read as the difference in the number of steps. Also, if photometry is performed multiple times as described above,
When the luminance difference between the spot photometry value obtained at a certain point and the above average value exceeds the displayable range (in the example, ±4 steps from the center value), the under/over warning pattern 17 or 18 in Fig. 3 is displayed. Lights up to warn the photographer that there are other photometric values than those shown by the displayed bar pattern. The one segment pattern 19 in FIG. 3 is a pattern for displaying film information as described above.
When the film cartridge is loaded, winding is completed, and it is ready for shooting, a specific pattern as shown in FIG. In addition, as shooting progresses and the number of remaining films decreases, and when the number of remaining films falls below a certain number (9 or less in this example), the "F'" display will change to the fifth position.
As shown in the figure, the number of remaining films will be displayed digitally, and the number of remaining films will be 9.
When the number of films is less than 9', the display value decreases each time a photograph is taken, such as "9'", "81", etc., and the photographer is warned of the number of films remaining.

Next, the average photometry mode will be explained.

In the average photometry mode, the liquid crystal display 14 shown in FIG. 2 is used only for displaying film information, and displaying photometry values is prohibited. That is, in this mode, the scale pattern 15 in FIG. 3 and the under/over warning patterns 17 and 18 in FIG. 3 are not displayed, and the display on the display section 14 is switched to the film information display.

In this film information display, the remaining amount of film is displayed in a semi-analog manner in the bar graph pattern section 16 in Figure 3, so that you can quickly grasp how much film is left. be. That is, in the example, one bar pattern represents six sheets of film, and 36
When more than one film is loaded, a pattern of six bars lights up every two bars as shown in FIG. 6, indicating that the remaining amount of film is 36 or more. Shoot from this state, and when there are 35 to 30 films remaining, there will be 5 bar patterns as shown in Figure 7, when there are 29 to 24 films, there will be 4 bars as shown in Figure 8, and when there are 23 to 18 films, there will be 5 bar patterns as shown in Figure 8. When there are 17 to 12 pieces, there are 3 bars as shown in FIG. 9, and when there are 17 to 12 pieces, there are 2 bars as shown in FIG. 10, so that one bar disappears for every 6 pieces.

Here, when the initially loaded film takes 24 shots or 12 shots, the bar pattern starts with four and two lights on, respectively, and one bar disappears for every six films. Also, the number of films remaining is 11 to 10.
When the number of remaining films is 9, one bar pattern is lit as shown in Figure 11, and when the number of remaining films is 9 or less, the display changes from a semi-analog bar pattern display to a 7-segment digital display as shown in Figure 12. After that, the number of remaining films will be displayed numerically as in the spot metering mode.

FIG. 15 is a circuit diagram showing an embodiment of a display control circuit for controlling the display of the display section 14 shown in FIG.

In the display 14, 5EGO is a segment pattern that constitutes the spot photometry scale pattern 15 shown in FIG. 3, and 5EG1 to 5EG19 are bar patterns 1 in FIG.
6 and warning patterns 17 and 18. Furthermore, the 7-segment pattern 19 in FIG. 3 is composed of segments S EG a -S EG g. This display 14 has input signals 5CALE and 5EGI.
~ S E G 19 , S E G a N S E
G When g is high, it is in the display state, that is, it lights up.

CNTRL is a spot photometry display control circuit, which is formed in the spot photometry mode when the spot photometry mode is selected with the mode switching member and the AD conversion value for the spot photometry performed each time the operation member is operated. The spot photometry mode signal (high level) is inputted, the deviation of each spot photometry from the average value of spot photometry is calculated, and the output terminals Y, -Y, are determined. Generates output from.

That is, this control circuit CNTRL calculates the difference (EV - EV, ~EV -
EVn) tt is determined, and when the above deviation curve is t't't, the output end is Y. generates output from segment GFJG
10 is lit, and the above deviation is correct.

- By increasing by 0 and 5 steps, each output terminal Y□~
Generate output from Yl, , Y, ~Y, and segment
G 8113G1 1 ~ 8 E G19,5
This lights up EG9-5RGI. Incidentally, the control circuit CNTRL sets all the outputs of the output terminals Y, to Y2 to p when the spot photometry mode signal is at a low level, and prohibits the above-mentioned deviation display.

DX7 to DXIO are switches that detect the code when a so-called DX film, which is a type of film in which film volume WK film frame number information is written in a code, is stored in the film storage chamber of the camera.

Among the switches, DX8 to DXIO are switches for reading a code indicating the number of film frames attached to the above-mentioned DX film, and the switch DX7 is used to detect whether or not the film stored in the film storage chamber is the above-mentioned DX film. It is a switch. DXR is a reading unit connected to the detection switch, and sends the frame number code detected by the switches DX8 to DX10 to the code converter TRNI, which converts it into a binary code, and also sends the detection result of the switch DX7 to the inverter G2. Send to.

CNTRI is a decrement counter that inputs the output of the code converter TRNt to the data input terminal, and responds to the autoloading completion signal output from the four-way circuit when the film is autoloaded in a known film loading circuit. and input the output of the above converter. The counter (::NTR1) counts 11 each time the film is wound in response to a winding completion signal from the film winding circuit.

G3 is an OR gate connected to the inverters G2 and G3, and when the output of the inverter G2 is at a high level, that is, when the switch DX7 detects that the film is not a DX film, and the output of the inverter G1 is at a high level. That is, when a cartridge detection switch (not shown) detects that no film container is stored in the film chamber, a high level is transmitted to the clear terminal CLR of the counter CNTR1 to clear the counter. DCDI to DCD7 are the above counters CNT
The decoders DCDI to DCD7 decode the contents of RI, and each of the decoders DCDI to DCD7 has a counter contents of 3.
6 or more, 30 or more, 24 or more, 18 or more, 12 or more, 1
It detects whether it is greater than or equal to 0 and less than or equal to 3, and sends out a high level when the contents of the counter meet each of the above conditions.

05 to G10 are AND gates, G20 to G25 are OR gates, and G4 is an inverter. These elements constitute a data selector and switch the input state of the display 14.

012 to G15 are AND gates which respectively input the lower 4 bits of the output (7-bit signal) of the counter CN'rR,1 to one input terminal, and input the output of the NAND game) Gl1 to the other input terminal. It is a gate. 0
16 to G19 have the decoder DC at each input terminal.
This is an OR gate which inputs the output of the D6 inverter G2 and also inputs the outputs of the above-mentioned ant games Gl2 to G15 to a predetermined gate.

TRN2 is a segment converter that converts the input binary code signal into a 7-segment drive signal, which converter outputs an output signal 8EG when the input signal is (o, o, o, o).
Set a to 8EGg to low level and prohibit display. or,
When the input signal is (1, 1, 1, 1), the output signal is 8EG
a.

5EGf, SgQg, and SEG/ are set to high level to display "F".

O8CI is a pulse oscillator, CNTR2 is a divider that divides the frequency of the pulse from the oscillator, and when the number of remaining films becomes 3 or less, the divided output is transmitted to G12 to G15 via GLL. The segment pattern 19 blinks to warn that the amount of film remaining is small.

Next, the operation of the embodiment shown in FIG. 15 will be explained.

First, the case where the photometry mode is spot photometry will be described.

In this case, the spot metering mode is selected using an operation member (not shown), so the spot metering mode signal (high level) is input, segment 8BGO lights up, scale display pattern 15 is displayed, and gates 05- GIO
becomes low level. On the other hand, the display control circuit CNTKL is in an operating state because the spot photometry mode signal is input thereto. Therefore, the control circuit CNTRL calculates the deviation of each spot photometry value from the average value of the spot photometry, and outputs the predetermined output terminals Y1 to Y1 . Sends a high level from the predetermined segment sgot 9~
5BG1 is turned on to indicate the step difference with respect to the average value of each spot photometric value.

That is, for example, if spot photometry is performed twice and each spot photometry value is EV=t and EV=31+3, the average value will be 2, and the spot photometry value EV=1 will be different from the average value. 11th stage Also, EV=3 is a rounded deviation of +1 stage, and the outputs Y and Yl of the control port NCNTR,L send out a high level.Therefore, segments )SgQg and 5gG12 light up, and the fifth As shown in the figure, it is displayed that each spot photometric value is a photometric value located one step above or below the average value.

Also, assuming that a DX film container is stored in the film chamber, information on the number of frames of the stored film is input to the counter, and each time a picture is taken for this number of frames and a DX film is wound, the number of frames is will be counted. Therefore, the contents of the counter CNTRI always represent the number of remaining frames, and when this number of remaining frames is ≧10, a high level is sent from the decoder DCD6 and the gates GL6 to
G19 also sends out high level ~.

Therefore, the 7 segment pattern 19 displays "F", indicating that the remaining number is 10 or more.

Also, when there are 9 to 4 frames remaining on the film, gate 016~
Since the output of the counter CNTR1 is input to G19 via the AND gates G12 to G15 instead of the output (high level) of the decoder DCD6, the number of remaining frames is displayed numerically according to the seven segment pattern 19. Furthermore, when the number of remaining films is 3 or less, a high level is sent from the decoder DCD7, so the output of the frequency division 1cNTR2 is transmitted to the gates 012 to G15 via the gate G11, and as a result, the 7 segment pattern 19 is the number of remaining films. is displayed numerically, and the display is made to blink in synchronization with the output of the frequency divider CNT 2. In addition, counter CNTRI
When the content of the 7-segment pattern 19 becomes zero, the display of the 7-segment pattern 19 is prohibited, and the photographer is informed that there are no remaining film frames.

Next, the case of average photometry mode will be described.

In this case, since the spot photometry mode signal is at a low level, the control circuit CNTRL is cleared and outputs Y, -Y, 9 all send out low level.

On the other hand, since the gate G4 sends out a high level, the gates 05 to GIO shift to the operating state.

Therefore, if the number of frames of the stored DX film is 36 or more, the decoders DCDI to DCD6 all send out high level signals, so segment 8EG17.5EGI4
．． 8EG11.8EG8゜8BG5.8BG2 lights up, and the bar pattern shown in the above-mentioned DJ6 indicates that the number of remaining films is 36 or more. In this case, the segment) 8EGO is not lit, so the scale The display of Sukel patterns is prohibited.

From then on, use the counter CN as in the spot metering mode described above.
The content of TRI decreases by 1 for each shot, and when there are 35 to 30 frames remaining on the film, 8BG14.5EGI 1.
5EG8.5EG5゜5FllG2 lights up and is displayed as shown in Figure 7. When there are 29 to 24 frames remaining on the film, 5EG11.8gG3.8BG5.5EG2 lights up and is displayed as shown in Figure 8, indicating the number of remaining film frames. When the number of frames remaining is 23 to 18, 8113G8.8EG5.5EG2 lights up and the display is shown as shown in Figure 9. When the number of remaining film frames is 17 to 12, 5EGs and 8EG2 are lit and the display is shown as shown in Figure 10. When the remaining number is 11°10, 8gG2 lights up and the display as shown in FIG. 11 is displayed.

Furthermore, when the number of remaining films becomes 10 or less, all of the decoders DCDI to DCD6 send out low level signals, so the bar pattern 16 is prohibited from displaying, and instead, the 7 segment pattern 19, which had been displaying "F" until then, is disabled. The number of remaining film frames is displayed numerically as shown in Figure 12, and if the number of film frames becomes 3 or less in the state of
As shown in the figure, the numbers shift to a blinking display, and when the remaining number reaches zero, all display is prohibited. Furthermore, when the stored nine films are not DX films, the output of inverter G2 becomes high level, so the seven segment pattern 19 displays "F'" as shown in FIG. 14, and the counter (:NTh1 is cleared. Therefore, bar pattern display is prohibited even in average metering mode.

In addition, when no film is stored, the output of inverter 01 becomes high level, so converter TRN2
is in a clear state, and the 7 segment pattern 1
90 display is prohibited, and the counter CNTRI is also cleared, so even in average metering mode, bar pattern display is also prohibited, and in this case, the display 14
In some cases, nothing may be displayed in average metering mode.

In the embodiment, whether the bar pattern displayed on the display 14 indicates the remaining amount of film or the spot photometry value is distinguished by the presence or absence of a scale pattern. Another display pattern may be provided to indicate the photometric value. Further, in the embodiment, the spot s value is displayed as a relative value, but instead of this, an absolute value display that displays the absolute value of each spot value as a bar may be used. Furthermore, although the number of remaining films is displayed in a one-permanent pattern every six films, it goes without saying that this number is not limited to six films.

Further, in the embodiment, the remaining amount of film is displayed, but instead of this, the number of photographed frames may be displayed.

Further, in the embodiment, the film frame information is displayed in such a way that a number of bar segments corresponding to the number of remaining frames are lit, but instead of this, bar segments at nine positions are set according to the number of remaining frames.
It is also good to turn it on.

Effect> As described above, in the present invention, the display device that displays multi-point photometry values in a bar pattern is also used as a film knob information display in modes other than the multi-point photometry mode. , when not shooting in a mode that performs multi-point metering such as spot metering and pays close attention to the drawing, you can shoot while visually checking the film frame number information in the viewfinder, and use average metering etc. to shoot moving subjects. facing towards
In the case of a photometry method suitable for continuous shooting, it is possible to take pictures while checking the number of frames.

Therefore, according to the present invention, each photometric value can be displayed during multi-point photometry, and film frame information can be displayed in the viewfinder during average photometry, which is often performed in continuous shooting, thereby preventing the film from running out during continuous shooting. This can prevent drawbacks such as not being able to capture the image and missing a photo opportunity.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing the optical system of a camera to which the display device according to the present invention is applied, FIG. The figure is a circuit diagram showing a control circuit of a display device according to the present invention. 14・・・・・・・・・Display unit

Claims (1)

[Claims] A display device for a camera having a multi-point photometry mode that measures light at multiple points on a photographic screen, comprising: a display that displays film frame number information in a bar pattern; and a selection means for selecting the multi-point photometry mode. A display device for a camera, comprising a control circuit that transmits each photometric value to the display and displays each photometric value in a bar pattern when the multi-point photometry mode is selected by the selection means.