JPS6225737A - Indicator for frame number of film - Google Patents

Abstract

PURPOSE:To prevent flickering when indicating frame number of a film at all times by detecting information of the frame number of the film, and indicating information of the frame number of the film only after the time when the remaining number of frames became less than a specified number. CONSTITUTION:When a DX film of the type in which information of the number of frames of the film is described in code on the film container is put in a film chamber, the code is detected by switch DX 7-10, and read by a DX code reading section DXR, converted to binary code by a code converter TRN1 and stored in a counter CNTR1. The content of the counter CNTR1 always indicates the remaining number of frames, and when the remaining number of frames >=10, high level is sent out from DCD6, and a 7 segment pattern 19 indicates 'F'. When the remaining number is 9-4 frames, the remaining number of frames are indicated in numerals by output of the counter CNTR1, and when the remaining number became 3 frames, the pattern 19 starts flickering by high level from a DCD7, and when the remaining number became zero the pattern 19 prohibits indication, and informs a photographer that remaining number is zero.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a camera, and more particularly to a camera display device for displaying film frame number information.

BACKGROUND ART Cameras are known in which the number of film frames is displayed in the viewfinder and the number of film frames can be checked without taking your eyes off the viewfinder during shooting.

With a camera like this, you can check the number of films without taking your eyes off the viewfinder, which is very convenient. The displayed value flickers. In particular, when a motor drive device is attached to the camera or a camera with a built-in motor drive device, shooting is carried out continuously and repeatedly at high-speed intervals, so the above-mentioned flicker supply is This has the disadvantage that the display increases and becomes difficult to see.

Also, it is not so necessary to recognize the number of film sheets by a number (the number of frames at 5j!) when there is a large number of remaining films, but it becomes necessary when the number of remaining films is, for example, one digit. It happens.

<Purpose> The present invention has been made in view of the above-mentioned matters, and is a film frame number display that solves the above-mentioned problem by displaying film frame number information only when the number of film frames has been used for a predetermined value or more and the remaining number of frames has decreased. The aim is to provide the equipment.

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

Figure f.1 shows the arrangement of the photometry system of a camera to which the display device according to the present invention is applied! ! FIG. vg1 In the diagram, 1 is the photographic lens, 2 is the 45° semi-transparent main mirror, 3 is the focusing plate, 4 is the pentaprism, 5 is the eyepiece lens, 6
is a condensing lens for average photometry, 7 is a photodetector for average photometry, and 8
9 is a total reflection sub-mirror, 9 is a spot photometry lens system, 1 is
0 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. To measure the light with J trowel average light measurement is performed.

A part of the light beam guided to the main mirror 2 passes through the main mirror, is reflected by the sub-mirror 8, and is sent 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. Both average and spot photometry can be performed with the writing configuration, 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 described later.

FIG. 2 is a diagram showing the display state within one field of view of the finder in the camera shown in M1, where 11 is the viewfinder field of view, 1
2 and 13 are 7-segment indicators that respectively indicate the shutter speed and aperture value, and in this example, L]1liI
) is formed by an indicator. 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 showing how much the side light value obtained by spot photometry deviates from the fog control value (the exposure value determined by the actually controlled shutter speed and sometimes the aperture value). 15 in the pattern
15B is an index indicating the center position, 15B is an index indicating 1/2 step of the photometric value, and 15C is an index indicating 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 and 18 are under and over warning patterns each indicating that there is a photometric value outside the displayable range. 19 is a 7-segment pattern, and in this pattern, the film has completed winding.
When the camera is ready for shooting, a specific pattern, F'' in this embodiment, is displayed, and when the number of remaining films is a specific number, in this embodiment, 9 or less, the number of remaining films is digitally displayed.

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

First, the spot side light mode will be explained.

In the spot photometry mode, the scale pattern 14 shown in FIG. 5 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 bar pattern of FIG. 3 at a position opposite to the index 15 of FIG. 5 is displayed as shown in FIG. 4. That is, in the first 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, if you operate the operating member again to perform spot metering and obtain the second spot metering value, the camera will move to the first spot metering value.
The average value of the second photometric values is calculated, and the bar pattern display is moved so that this value faces the index 15 at the center of FIG. That is, if the second spot photometric value is, for example, two steps lower in brightness than the first spot photometric value, the second spot photometric value is set at a position shifted one step upwards from the 15 mm position as shown in FIG. A bar pattern corresponding to the first spot photometric value is displayed, and a bar pattern corresponding to the second spot photometric value is displayed at a position shifted by one step below IA.

After that, if you operate the operating member and measure the spot side original value multiple times, the average value of each spot photometric value will shift to a position corresponding to 15 mm, and the brightness difference of each photometric value from the average value ( A bar pattern is displayed at a position corresponding to the deviation), and the luminance difference between each photometry value and the above average value can be read as a step difference. In addition, when photometry is performed multiple times as described above, the brightness difference between the spot photometry value obtained at a certain point and the above average value is greater than or equal to the displayable range (in the Iiii! example, ±4 steps from the center value). Sometimes under the figure 3,
The over warning pattern 17 or 18 lights up to warn the photographer that there are photometric values other than those shown by the displayed bar pattern. The 7-segment pattern 19 in FIG. 3 is a film information display pattern as described above, and when the film cartridge is loaded, winding is completed, and ready for shooting, a specific pattern as shown in FIG. 4 is displayed. ``Pl'' of ``FILM'' is displayed to notify the photographer that the film is loaded.

Also, as shooting progresses, the number of remaining films decreases, and when it reaches a certain number (less than 9 in this example), the "A" display becomes a digital remaining number display as shown in the ggs diagram, indicating the number of remaining films. If the number of sheets is less than 9, 9m"8"...
The displayed value decreases each time a photo is taken, giving the photographer a warning of the number of films remaining.

Next, the average photometry mode will be explained.

In the average photometry mode, the 21st liquid crystal display 14 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 bar graph pattern section 16 in Fig. 3 displays the amount of film remaining in a semi-analog manner, 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 five
When a film with 6 or more exposures is loaded, a pattern of 6 bars lights up every second bar 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 left, the 7th F! ! When the bar pattern is 5 pieces like J, and from 29 to 24 pieces, as shown in Fig. 8 (when there are 4 pieces, and from 2S to 18 pieces, the bar pattern is 9 pieces)
When there are 3 pieces as shown in the figure, and 17 to 12 pieces, there are 2 pieces as shown in Figure 10.
The bar disappears one by one every six pieces. Here, when the first loaded film takes 24 shots and 12 shots, there are 4 bar patterns each,
It starts with two bars lit and disappears one by one for every six pieces of film. Also, the number of films remaining is 1.
When there are 1 to 10 sheets, one bar pattern lights up as shown in Figure 11, and when the number of remaining films becomes 9 or less, the number of remaining films changes from a semi-analog display using a bar pattern to a 7-segment display as shown in Figure 12. The display switches to a digital display, and from then on, the number of remaining films is displayed numerically, just like in 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, 5xao is a segment pattern forming the spot photometry scale pattern 15 shown in the third figure, and 8KG1 to 81()19 are segments forming the 31st bar pattern 16 and warning pattern 17°18. . Further, the 7 segment pattern 19 in FIG. 3 is composed of segments 8 KG and 8 mGg. This display 14 receives input signals 5CAI, 8E()l~8KG1
When 9°5EGa-8Eυa is high, the display state is lit.

CNTRL is a spot photometry display control circuit, and the path [ ] indicates an AD conversion value for spot photometry performed each time the operation member is operated in the spot photometry mode, and when the spot photometry mode is selected with the mode switching member. The generated spot photometry mode signal (high level) is input, the deviation of each spot photometry with respect to the average value of spot photometry is determined, and outputs are generated from predetermined output terminals Y1 to Y19.

That is, this control circuit (j N T it L is the value of each spot photometry value (EV+ to EVn) % (ICV
-EV1 to EV -y, vn), and when the above deviation is zero, output is generated from output terminal YjO, and segment 5
By turning on FiGIO and increasing the above deviation by +0.5 steps, the output terminals Y11 to Y, , Y
, ~Y1 generates output and segment 8KG11
~BEG19, 5za1 is turned on to 1KG9. Incidentally, the # control circuit CNTRL is output from the output terminals Y, to Y1 . All outputs are set to low, and the above difference display is prohibited.

DI7~DX10t; j Film types whose film frame number information is written as a code on the film container, 1F
This is a switch that detects the above code when IDI film is stored in the film storage chamber of the camera.

Of the nuclear switches, DI8 to DIIO are switches that read a code indicating the number of film frames attached to the above-mentioned DI film, and switch DX7 detects whether the film stored in the film storage chamber is the above-mentioned DX film or not. This is a switch for DIR is a reading unit connected to the above detection switches, and the above switches DI8 to DIIQ
The detected frame number code is sent to a code converter TRNI for converting it into a binary code, and the detection result of the switch DX7 is sent to an inverter G2.

CNTP, TIJ This is a decrement counter that inputs the output of the code f converter TRI l to the data input terminal, and when the film is autoloaded in a known film load circuit, an autoloading completion signal is output from the load circuit. In response, input the output of the converter. Also, the counter C! The NTRI performs a count of 1 each time the film is wound in response to a wind 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 When the level is high, that is, when it is detected that no film container is stored in the film chamber at ct-ne detection (inch) (not shown), the counter is set to 0NTR1.
Clear 1st child CT, tell H the high level and clear the counter. DcD1~DC! D7 is a decoder that decodes the contents of the counter CNTRI, and each of the decoders DCD1 to DCD7 decodes the contents of the counter 56DL, 30 or more, 24 or more, 18 or more,
It detects whether it is 12 or more, 10 or more, or 5 or less, and sends out a high level when the contents of the counter meet each of the above conditions.

05 to G10 are AND gates, 020 to G25 are OR gates, and G4 is an inverter. These elements constitute a data selector and switch the input state to the display 14.

G12-%-G+5 is an AND gate that inputs the lower 4 bits of the output (7-bit signal) of the counter CNTRI to the input terminal of m1, and inputs the output of the Nant gate G11 to the other input terminal. . Gl
d to G19 have the decoder DOD at each input terminal.
6 Inverter - This is an OR gate which inputs the output of G2 and inputs the outputs of the AND gates Gt2 to G15 to a predetermined gate.

TRN2 is a segment converter that converts the input binary code signal into a 7-segment drive signal, and the converter outputs an output signal 8EG when the input signal is (0,0,0,0).
A-8KGg is set to low level and no display is prohibited. or,
When the input signal is ('si,'s'), the output signal is 5IC
Ga, BHG! , 81Qg #sI! ! ” is set to high level and 1 is displayed.

0801 is a pulse oscillator, ON'rR2 is a divider that divides the pulse from the oscillator, and when the number of remaining film frames becomes 3 or less, the divided output is transmitted through gate G11 to segments 012 to G15J. The converter 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, the segment aKGO lights up, the scale display pattern 15 is displayed, and the gate 35 ~G.I.
Q becomes a low level. - 10,000, display control circuit ON''TR
Since the spot photometry mode signal is input to L, it is in the operating state. Therefore, the control circuit CMTRL calculates the deviation of each spot photometry value from the average value of the spot photometry, and sets the predetermined output end Y, to Yl for every 0.5 steps of deviation.
? Sends a high level from the predetermined segment 5EGI
? ~5EG1 is turned on to indicate the difference in the number of steps with respect to the average value of the light value of each spot.

That is, for example, if spot photometry is performed twice and each spot photometry value is zv = t, xv = 31 + 3, the average value will be 2-2, and the spot photometry value EV = = 1 will be different from the average value. 11 steps again, KV=3
Since the difference is +1 stage, the outputs Y and Y12 of the control circuit 0NTRL send out high level. Therefore, segment) 8KG8 and 81G12 are lit, and the above 5N
As shown (indicates 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 0NTRI 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 016 to G
19 also sends out a high level. Therefore, the 7 segment pattern 19 displays "1F", indicating that the remaining number is 10 or more. Also, when there are 9 to 4 frames remaining on the film, Kate 016~ (and goo instead of the output (high level) of the above decoder DCD6 on HP) 12~GI
Since the output of the counter 01fTR1 is input through the 7-segment pattern 19, the number of remaining frames is displayed numerically. Furthermore, when the number of remaining films is 73 or less, a high level is sent from the decoder DCD7, so
The output of the frequency divider 0NTR2 is transmitted to the gates 012 to G15 via the gate G11, and as a result, the 7-segment pattern 19 numerically displays the number of remaining films and causes the display to blink in synchronization with the output of the divider CNTR2. Pottery,
When the contents of the counter 0NTRI become zero, the display of the seven 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 metering mode signal is at a low level, the control circuit OH position is cleared and the output Y1
-Y19 all send out low level.

On the other hand, G4 sends out a high level, so G4)
05~Gin transitions to the operating state.

Therefore, if the number of frames of the stored DX film is 56 or more, the decoders DOD1 to DOD6 all send out high level signals, so segment 5ICG17.13KG
14.81G11.8K ()8. EIKG5゜81G2
lights up, and a bar pattern is displayed to indicate that the number of remaining films is 36 or more, as shown in the sixth figure. (In this case, segment) Since BRCkQ is not lit, display of the graduation scale pattern is prohibited.

From then on, the counter (l
The contents of jNTRl decrease by 1 for each shot, and when there are 35 to 30 frames remaining on the film, 1111KG14,
8EG11, 5KG8, 8KG5, and 8KG2 light up and are displayed as shown in Figure 7, indicating that the number of remaining films is 29.
~ 5EG11,5KGB at 24 frames.

5EG5 and 5EG2 light up and display as shown in Figure 8. When the remaining number of film frames is 25 to 18, 8EG8°8EG
5. f3KG2 lights up and displays as shown in Figure 9, and when the number of remaining films is 17 to 12, 8KG5.8KG2 lights up and displays as shown in Figure 10, and the number of remaining films is 11, 10.
At this time, 8KG2 lights up and the display as shown in FIG. 11 is displayed.

Furthermore, when the number of remaining films becomes 9 or less, decoder D
Since all of CD1 to DCD6 send out low level signals, bar pattern 16 is prohibited from being displayed, and instead, 7 segment pattern 1, which had previously been displayed as ""F"F", is displayed.
．． 9, the number of remaining film frames is displayed numerically as shown in Figure 12), and if the number of film frames becomes 6 or less in this state, the first S
As shown in the figure, the numbers shift to a blinking display, and when the remaining number reaches zero, all display is prohibited. Also, when the stored film is not a DI film, the output of the inverter G2 is at a high level, so the 7 segment pattern 19 is as shown in FIG. Since the counter CNTRI is cleared at the same time as ° is displayed, bar pattern display is prohibited even in the average photometry mode.

In addition, when no film is stored, the output of inverter G1 becomes high level, so converter TRN2
is in a clear state, and 7 segment pattern 1
Since the display of 9 is prohibited and the counter 011iTR1 is also cleared, the bar pattern display is also prohibited even in the average metering mode, and in this case, depending on the display 14, nothing may be displayed at all in the average metering mode. becomes.

In this example, whether the bar pattern displayed on the display 14 indicates the remaining film amount or the spot photometry value is determined by the presence or absence of a scale pattern. Another display pattern may be provided to indicate whether the photometric value or the photometric value. Further, in the embodiment, the spot photometry display is performed using a relative value display, but instead of this, an absolute value display in which the absolute value of each spot value is displayed as a bar may be used. Further, the remaining amount of film is displayed in a 1-bar pattern every 6 sheets, but it goes without saying that this number is not limited to 6 sheets.In addition, in the embodiment, the remaining amount of film is displayed in a pattern of 1 bar. However, instead of this, the number of captured frames may be displayed.

Further, in the embodiment, the film frame information is set such that a number of bar segments corresponding to the number of remaining frames are lit, but instead of this, bar segments of a position corresponding to the number of remaining frames can be selectively illuminated. You can also turn it on. Also, although seven segments are shown as the display, a dot pattern display may be used instead.

<Effects> As described above, the film frame number display device according to the present invention displays film information when the number of remaining films falls below a predetermined value, so the number of film frames is always displayed. It is possible to prevent flickering at the time of display, and also to know the number of frames when displaying film information is necessary.

In this embodiment, when the film is loaded, the display is displayed in a specific pattern, so even if the number of film frames is not constantly displayed, it is possible to know whether or not the film is loaded. It is something that can be done.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing the optical system of a camera to which a display device according to the present invention is applied, FIG. 2 is a viewfinder configuration IN of a camera equipped with a display device according to the present invention, and aK31i& is a display device according to the present invention. A configuration diagram showing an example of the above, Fig. 4~
FIG. 14 is an explanatory diagram showing a display state by the display device of the present invention, and FIG. 15 is a circuit diagram showing a control circuit of the displayed coin according to the present invention. 14...Display device DCD6/Φkai decoder

Claims (3)

[Claims] (1) In a film frame number display device that displays information on the number of frames counted by a frame counting means for counting the number of film frames, when the counted value of the frame counting means is detected and the number of film frames reaches a predetermined value. A film frame number display device comprising a detection circuit that generates an output for subsequently displaying frame number information on the display device. (2) The film frame number display device according to claim (1), wherein the detection circuit generates the output when the remaining amount of film falls below a predetermined value. (3) The display device displays a specific pattern before the detection circuit output is generated.
The film frame number display device according to item 1).