JPH0472212B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film sensitivity setting device for a camera.

There is a technology in which a code representing the sensitivity of the film is written at the beginning of the film, and a device is installed inside the camera to read this code, thereby automatically setting the film sensitivity in the camera.
RESEARCH DISCLOSURE April 1980 142
Published on page 19223 Photographic fim coding. In the method described in this document, the film sensitivity is written in binary code at the beginning of the film, and a hole is punched between the film feed perforations to serve as the code. A detector that detects the above code and a detector that detects the hole as the code are arranged side by side,
Binary codes are read by the cooperation of the two.

When using the method described above, the camera user does not have to manually set the film sensitivity each time the camera is loaded with film, and the film sensitivity setting is automatically set, which prevents forgetting or making mistakes in setting the sensitivity. Although this is very convenient, it has the inconvenience of not being able to freely set the film sensitivity value to be set on the camera when performing sensitized photography. Sensitized photography is a photography technique that uses, for example, ISO400 film, sets exposure conditions at ISO3200, photographs, and then performs sensitization processing.

Furthermore, taking into consideration the finished image quality such as graininess, and the latitude of the film, lower the film sensitivity (for example, even with ISO 200 film).
ISO 100) may result in slightly overexposed shots. In such cases, the film sensitivity value set in the camera is different from the sensitivity value of the loaded film, but with the technology published in the above-mentioned document, when such shooting is often performed, the film sensitivity information set in the camera can be used. Cannot be changed arbitrarily.

The present invention is based on the technology disclosed in the above-mentioned document,
This was done with the aim of eliminating the inconvenience caused by frequently changing the set film sensitivity to take pictures.

The present invention is a camera that performs exposure control based on the sensitivity value written on the film. In addition, under the film sensitivity value that is modified or not modified in this way, it is also possible to easily change the exposure amount arbitrarily based on the shooting situation, intention, etc. in the case of individual shooting. I did it like that. The present invention will be explained in detail below with reference to Examples.

FIG. 1 shows an embodiment of the present invention, and in order to facilitate understanding of the concept of the invention, each functional part is represented by one block, and the specific structure of these blocks is shown in FIGS. 2 to 4. Indicated. The illustrated device is installed in a camera and used for sensitized photography. In FIG. 1, 1 reads the code of the film sensitivity value recorded at the beginning of the film loaded in the camera. , a sensitivity value code reading means for outputting film sensitivity data, the specific construction of which is shown in FIG. 3 is a manual film sensitivity value setting means. Reference numeral 5 denotes an adder circuit which calculates a sensitivity value assumed by adding the original sensitivity value of the loaded film, which is the output of the sensitivity value code reading means 1, and the sensitivity value (sensitization value) set by the manual film sensitivity value setting means. Outputs the signal. In this embodiment, the manual film sensitivity value setting means 3 does not set the sensitivity value (sensitization value) itself planned for photographing, but rather data indicating how much the sensitivity should be changed from the current film sensitivity in order to achieve this sensitivity. Therefore, the output signals of the two blocks 1 and 3 are added by the adder circuit 5. The output of the adder circuit 5 is stored in a storage device 13 via an AND gate group 11. Reference numeral 18 denotes an exposure compensation means that is manually operated. When the exposure compensation means 18 is not operated, the exposure control device 15 of the camera performs an exposure control operation according to the stored film sensitivity value, and the exposure compensation means 18 When is operated, exposure control in which the stored film sensitivity value is modified in accordance with the operation of the means 18, so-called override, is performed. The override value is displayed by display device 35. A display device 7 indicates that the camera is set to the manual film sensitivity setting shooting mode. The output signal of the film sensitivity reading means 1 is also transferred to the manual film sensitivity value setting means 3.
Both of the output signals are multi-bit signals obtained by binary encoding numerical values related to film sensitivity, and when shooting is not performed by manual film sensitivity setting, each bit of the output from manual film sensitivity value setting means 3 is 0, that is, low. When performing sensitized imaging, at least one of the output lines ₀₁ to ₀₆ of block 3 becomes high level, so this high level signal is sent to the display device 7 through the OR circuit 0R1.
The display device 7 displays that the camera is set to the manual film sensitivity setting photography mode. The AND gate group 11 consists of AND gates corresponding to each output bit of the adder circuit 5, and when the respective bit outputs of the film counter 9 are all 0, the AND gates open simultaneously. All bits of the output of the film counter 9 are 0 only while a new film is loaded and no frame has been photographed. At this time, the output of the NOR circuit NORI becomes high level and opens the AND gate group 11, so the addition circuit is activated. The signal of the film sensitivity value output from 5 is input to the storage device 13 only when a new film is loaded into the camera and no shots have been taken yet, and is stored in the storage device 13 from then on until the shooting of one film is completed. A constant film sensitivity value is held in 13, and exposure control is performed in accordance with this film sensitivity value. The reason why the film sensitivity value data is held and fixed in the storage device even after a new film is loaded and no photo has been taken yet is adopted for the following reason. RESEARCH above
The code for the sensitivity value stored on the film indicated in DISCLOSURE is provided only at the beginning of the film, so the film sensitivity cannot be read during shooting. For this reason, a storage device is required.
In addition, when performing sensitized photography, sensitization is carried out at the development stage, so sometimes sensitization is carried out on a single film, and sometimes it is not, or in the middle of a single film. It is not possible to change the sensitization value. Therefore, in this case, an ANDGATE group 11 is provided so that even if the setting of the film sensitivity value manual setting means 3 is changed by mistake during the shooting of one film, the originally set film sensitivity is not changed.

The storage device 13 is a RAM, a magnetic storage device with a write/read device, an electrochromy device, etc., which is constantly supplied with power from the time the film is loaded until all the frames have been photographed or the film is taken out midway. Consists of non-volatile memory.

The setting sensitivity display device 17 displays the normal sensitivity of the film used when shooting is not performed using manual film sensitivity setting, and displays the set film sensitivity when shooting is performed using manual film sensitivity setting.
Since this display does not need to be displayed all the time, it is better to have a configuration in which it is displayed only when the photographer presses the display button.

FIG. 2 shows a specific circuit configuration of the film sensitivity reading means 1 shown in FIG. In Figure 2, F is the film and PH is the perforation for feeding the film. The sign of film sensitivity is 6 bits of data, with 1 bit being the area between two perforations at the beginning of the film.
The bits and 1-bit codes each indicating the start and end of the sensitivity data code are stored in an 8-bit area SH. The code is recorded as number 1 if there is a through hole h in the area SH between the perforations, and as 0 if there is not. This code is read using two sets of light emitting diodes L1 and L2 arranged vertically.
and light receiving elements PD1 and PD2. These light-emitting diodes and light-receiving elements face each other with the film F in between, and the perforation PH of the film F and the through-hole h as a symbol pass together between the pair of light-emitting diode L1 and light-receiving element PD1. It's becoming like that. Only the perforation of the film F passes between the light emitting diode LL2 and the light receiving element PD2. Therefore, the output of photodetector PD1 is perforation PH
It includes both the detection signal of the code hole h and the detection signal of the code hole h. Further, the output of the light receiving element PD2 includes only the detection signal of the perforation PH of the film F. Therefore, by subtracting the output signal of PD2 from the output signal of PD1, only the detection signal of the code hole h can be obtained. This subtraction operation is performed using a signal obtained by inverting the output of the photodetector PD2 using an inverter INO.
is opened and closed, and the output of the photodetector PD1 is taken out through this AND gate ANO. What is indicated by b in the time chart of Fig. 3 is the detection signal train of the code hole h obtained in this way, and Fig. 3a is the perflation detection signal train which is the output of the light receiving element PD2. . Returning to Figure 2, ST is a hole that indicates the beginning of recording the sensitivity code, SE is a hole that indicates the end of recording the sensitivity code, and the sensitivity code is this ST.
and SE. During the process of loading the film into the camera and winding the film until the first frame is at the photographing position, the film moves in the direction of the rightward arrow in FIG. 2, and during this time the sensitivity code mentioned above is read. As mentioned above, the detection signal of the code hole h is a pulse train as shown in FIG. 3b, and is a temporally series signal. The circuit shown in Fig. 2 converts this time series signal into a time parallel signal and inputs it to the storage device 13 (Fig. 1).The outline of its configuration is as shown in Fig. 3a with a shift register. The signal string shown in Fig. 2b is read into the shift register while being shifted by the perforation detection signal.
The columns ~JF6 constitute the shift register.

The circuit configuration and operation of FIG. 2 will be described in further detail below with reference to the time chart of FIG. 3. Figure 3 shows the case where the film sensitivity value is stored as 110110 in 6-bit binary format.
The last (rightmost) pulse of the ST detection signal is the through hole SE detection signal indicating the end of recording. When the film is attached to the camera and the back cover of the camera is closed, power is supplied to a winding mechanism (not shown) and the circuits shown in FIGS. 1 and 2, and the film is wound up to the first frame. 21 is a circuit that lights up the light emitting diodes L1 and L2, and 23 and 24 are circuits that shape the outputs of the light receiving elements PD1 and PD2.

FF1 is RS-flip-flop and inverter IN
This flip・The Q output c of the flop FF1 outputs the waveform shown in FIG. 3c. In addition, the RS-flip-flop FF2 and the hexadecimal counter CO1 are reset signals output from the power-on reset circuit (not shown) when the film (F) is attached, the back cover is closed, and power supply starts. Reset by signal POR. Therefore, the carry terminal CY of counter CO1 and the Q output of flip-flop FF2 are "Low".
It's getting old. And the detection signal of the through hole ST is still an AND circuit because the carry terminal output of the counter CO1 is 0 and the output of the inverter IN2 is "High".
The output from AN2 sets the flip-flop FF2, the Q output d becomes "High", the AND circuit AN3 is opened, and the third
As shown in Figure e, a detection signal of perforation PH is output by the light receiving element PD2.

JK - The circuit composed of flip-flops JF1 to JF6 constitutes a serial input/parallel output shift register, and these flip-flops
JF1 to JF6 are reset by the above-mentioned power-on reset signal POR, and the output e of the AND circuit AN3 is used as a clock pulse.Based on the rising signal of this clock pulse, the Q output of flip-flop FF1 (FIG. 3c) is sequentially output. Output P1 to P
Transfer to 6. This situation is shown in Figure 3 P1 to P6
It is shown in Also, the output e of the AND circuit AN3
The clock pulse from is also input to the clock terminal of the heptadary counter CO1, and when this counter counts seven clock rises, it makes the carry terminal output f "High" (FIG. 3f). Therefore, the gate of AND circuit AN2 is closed and the AND circuit AN2 is closed.
When AN1 is opened, an AND circuit is formed by the through hole SE.
The signal from output terminal b of ANO (pulse signal at the right end of Fig. 3b) is output from AND circuit AN1,
Flip-flop FF2 is reset and its Q output terminal i becomes "Low", and the AND circuit AN
3 is closed and the clock pulse shown in FIG. 3e is no longer output. As a result, the outputs P1 to P6 of flip-flops JF1 to JF2 do not change, and the outputs of terminals P6 to P1 become 6-bit film sensitivity data of "110110", which is the same as the sensitivity signal recorded on the film. ing.

FIG. 4 shows a specific configuration of the manual film sensitivity value setting means 3 shown in FIG. 1, which is suitable for sensitized photography. The sensitivity value (sensitivity increase) is set by operating the up and down buttons (not shown). Sensitivity is originally set by pressing the UP button the required number of times, but if you press the UP button too many times, or if you want to change the sensitivity to a lower value, press the DOWN button the required number of times. Modify the increase sensitivity set with the start up button. CO2 is a 2-bit up-down counter,
CO3 is a 4-bit up-down counter into which the carry signal or borrow signal of counter CO2 is input, and both constitute a 6-bit up-down counter. Switch SW1 is a switch linked to the above-mentioned up button, switch SW2 is a switch linked to the down button, and SW3 is a switch linked to a reset button (not shown). When the back cover of the camera is closed and power is supplied to the circuit, the reset signal POR is sent to the counter through the OR circuit OR3.
Applied to the CO2 and CO3 reset terminals, both counters are reset. In this state, the counter
Since the outputs O1 to O6 of each bit of CO2 and CO3 are all 0 (low level), the output of NAND circuit NAN1 is 1 (high level) and the output of OR circuit OR4 is 0.
It is. Therefore, the AND circuit AN4 receives the high level signal from the NAND circuit NAN1 at one terminal and is open, and the AND circuit AN5 is closed because the output of OR4 is low. When the UP button is pressed, switch SW1 closes, one shot circuit OS1 is triggered, one pulse is output, and the AND circuit is activated.
It is applied as an up signal to counter CO2 via AN4. Press the down button to switch SW
2 closes and one pulse is output from the one-shot circuit OS2 and sent to the counter through the AND circuit AN5.
Although it is applied as a down signal to CO2, initially, as described above, AND circuit AN4 is open and AN5 is closed, so only the operation of the up button is effective. In other words, operation is possible only in the direction of sensitization. When the UP button is pressed many times, the 6-bit counter consisting of counters CO2 and CO3 adds up the number of times the UP button is pressed, and the output lines 01~
At least one output of 06 becomes 1 (high level). Then, the output of the OR circuit OR4 becomes high, so the AND circuit AN5 is also opened, and the operation of the down button becomes valid, and the counter CO2,
Decrease CO3 counting output arbitrarily. That is, it becomes possible to adjust the sensitivity. counter CO2,
When the outputs of output terminals O1 to O6 of CO3 all become 1, the output of NAN1 becomes low and the AND circuit AN
4 is closed, further pressing of the up button becomes invalid, and only the operation of the down button is valid. With the above configuration, it is possible to output binary 6-bit data to the output terminals O1 to O6 of the counters CO2 and CO3 by operating the up and down buttons, and this data is used as the output of the manual film sensitivity value setting means 3. The signal is input to the adder circuit 5 shown in FIG. If you wish to cancel the settings, press the reset button (not shown) to close switch SW3, apply a reset signal to counters CO2 and CO3 through OR circuit OR3, and reset CO2 and CO3.

FIG. 5 shows another embodiment of the invention. In this embodiment, the manual setting device 3 is configured to set the film sensitivity value itself at the time of photographing, rather than the amount of data to be changed. This configuration may be similar to the circuit shown in FIG. 31 is a data selector, and when the data set from the manual setting device 3 is output, the output of the OR circuit OR1 becomes "High", and the setting data from the manual setting device 3 is input, and the manual setting device 3 outputs the set data. When the output from the device is 0, the output of the OR circuit becomes "Low" and the data from the film sensitivity data 43 acquisition device 1 is output. Data from this data selector is sent to the gate circuit 11, and the output of the OR circuit OR1 is input to the display circuit 7.

FIG. 6 shows the internal details of one embodiment of the exposure compensation means 18 in FIG. 1 and the related configuration around it, and shows switches SW1, SW2, SW3 for setting film sensitivity values (sensitization data). It doubles as a switch for setting override (exposure compensation) shooting. When switch SW4 is connected to terminal A, AND circuits AN6 and AN7 are closed and override photography cannot be set. At this time, the output of inverter IN5 is “
“High”, and the AND circuit AN4 in Figure 4,
AN5 is opened and setting for shooting using manual film sensitivity setting (sensitivity shooting) is performed.

The circuit for override photography shown in FIG. 6 will be briefly explained below. If the counters CO4 and CO5 have been reset, the outputs of the OR circuits OR5 and OR6 will be "Low", and the outputs of the NAND circuits NAN2 and
Since the output of NAN3 is "High", AND circuits AN8 and AN10 are open. Therefore,
The UP signal is input to the UP terminal of counter CO4,
The DOWN signal is input to the UP terminal of counter CO5. At the stage when data is set in the counter CO4, the AND circuits AN8 and AN9 are opened, and when the UP signal is input, the counter CO4 further counts up, and when the DOWN signal is input, the counter CO4
counts DOWN. At this time, the counter CO5
The output of remains 0. Also, counter CO4
When all the outputs of become “High”, the NAND circuit
The output of NAN2 becomes "Low" and no further UP signals are accepted.

Also, if data is set in counter CO5, AND circuits AN10 and AN11 are opened, and if the DOWN signal is input to counter CO5,
Counts DOWN and UP when UP signal is input
Do a count. At this time, the output of counter CO4 remains 0. Also, if all the outputs of counter CO5 become "High", NAND circuit NAN3
The output becomes “Low” and does not accept the DOWN signal.

A data selector 33 outputs data from the counter CO4 when the output of the OR circuit OR6 is "Low" and outputs data from the counter CO5 when the output is "High". 35 is a display device that displays the override value, and the output of the OR circuit OR6 is "
If it is "Low", it indicates that +n stages are being overridden, and if it is "High", it indicates that override is being carried out by -n stages (n is the value based on the data from counter CO4 or CO5). 37 is an addition/subtraction circuit. OR circuit
If the output of OR6 is "High", the data from the data selector 33 and the data from the storage device 13 in FIG. 1 are added; if it is "Low", the data from the data selector 33 and the data from the storage device 13 are added. and subtract. The data from the addition/subtraction circuit 37 is inputted to the exposure control device 15 shown in FIG. 1 as film sensitivity data.

Note that the UP and DOWN buttons can also be used as buttons for setting exposure time or aperture value, for example.
It is possible to implement it with a circuit similar to that shown in FIG.

In addition, there are multiple types of data provided on the film (data other than film sensitivity is also provided).
If this is the case, the data can be read using the same arrangement as shown in FIG. 2 by increasing the number of JK-flip-flops, and the data from the JK-flip-flops corresponding to the film sensitivity data can be taken out as film sensitivity data.

According to the present invention, it is possible to take pictures with manual film sensitivity setting even with an automatic film sensitivity setting type camera.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention, FIG. 2 is a specific configuration example of the film sensitivity data reading device shown in FIG. 1, and FIG. 3 is a block diagram for explaining the operation of FIG. 2. Time chart Figure 4 is Figure 1
5 is another embodiment of the present invention, and FIG. 6 is a detailed diagram of the changing means portion of FIG. 2 of the present invention. 1... Reading device, 3... Manual film sensitivity setting device, 5, 11, 31... Output device, 13...
...Storage device, 15...Exposure control device, 7, 17...
...Display device.

Claims (1)

[Claims] 1. A reading means for reading a digital signal corresponding to the sensitivity of the film loaded in the camera; and a means for reading the digital signal read by the reading means to correspond to different film sensitivities according to manual operation. a manual film sensitivity setting means for changing the digital signal to a digital signal changed by the manual film sensitivity setting means when the manual film sensitivity setting means is operated; storage means for storing the digital signal read by the reading means as the sensitivity value of the film loaded in the camera when the reading is not performed; and storage means for storing the film sensitivity value based on the digital signal stored in the storage means. film sensitivity display means for displaying; exposure compensation means for changing the digital signal output from the storage means in response to manual operation; and exposure compensation means for changing the digital signal output from the storage means by the exposure compensation means a change operation display means for displaying the amount of change to be made; and a digital signal changed by the exposure correction means when the exposure correction means is operated;
A film sensitivity setting device comprising means for outputting a digital signal stored in the storage means for exposure control when the exposure correction means is not operated.