JPS6271938A - Photographing device - Google Patents

Abstract

PURPOSE:To prevent photographing from failure due to exposing conditions by continuously taking plural pictures under a proper exposing condition obtained from film sensitivity or the photometry of an object and exposing conditions close to the proper one. CONSTITUTION:After completing imprint under the proper exposing condition, similar recording iis executed under exposing conditions before and after the proper one. Since photographing is continuously executed under the proper exposing condition and the exposing conditions before the after the proper one only by one operation of a release button 6, three continuous images of the same object can be taken by an electronic camera and a film camera. Thus, plural continuous images are taken under the proper exposing condition obtained from the film sensitivity or the photometry of the object and exposing conditions close to the proper one, so that photographing can be prevented from failure due to the exposing conditions.

Description

[Detailed description of the invention] [Technical field of invention] This invention relates to a photographic device.

[Prior art and its problems] In recent years, cameras have become more and more integrated, and the IJ correct exposure conditions are calculated based on film sensitivity and subject photometry.
So-called programmed auto cameras, which automatically determine the aperture and shutter speed, are widely used6.However, even if an auto camera is used and the subject is extremely bright, the brightness in the vicinity may As a result, the exposure of the subject is insufficient, and proper exposure is not achieved, resulting in a failure in photographing.

[Purpose of the invention] This invention was made in view of the above-mentioned concerns.
The purpose is to provide a photographic device that can avoid failures in photographing due to exposure conditions.

[Key points of the invention] This invention aims to achieve the above-mentioned objects.

The gist of this method is to continuously photograph a plurality of images under appropriate exposure conditions obtained by film sensitivity and photometry of the subject, and under exposure conditions close to these exposure conditions.

[Example] The present invention will be specifically described below based on an example shown in the drawings. Note that this embodiment shows an example in which the present invention is applied to a photographic device that combines not only a photosensitive film camera but also an electronic camera that records on an electronic recording medium such as a magnetic floppy disk.

Structure of the Embodiment Fig. 2 is an external perspective view of the photographic RC device. Switch, 7 is the film advance lever, 8 is the shutter speed dial, 9 is the mode selector, 1O is the film rewind knob.

11 is a film sensitivity dial. Further, FIG. 3 shows the back side of the camera, and in the figure, 12 is a finder, 13 is a film number display window, and 14 is the back side 4. In this case, in this embodiment, there is a liquid crystal display device 15. A keyboard 16 is attached. LCD display device! 215 is driven by, for example, a 120×160 dot matrix display system, is used as a playback function of an electronic camera, and is capable of displaying one screen worth of captured images. Further, on the keyboard 16 are various keys for appropriately specifying, for example, 36 screens worth of image data recorded on the recording medium of the electronic camera and displaying it on the liquid crystal display device 2115, that is, the number of images to be displayed. Enter the numeric keypad Kl, 2 for the display key to display the image corresponding to the mechanically selected image number, Y for the plus key to display the next image sequentially, 4 for the minus key to display the previous image sequentially, etc. A display ON key Kb and an OFF key 6 are provided for specifying whether or not to display an image on the liquid crystal display device fi15.

FIG. 3 shows a partial sectional view of the photographic device.

An opening/closing mirror 18 is disposed on the optical path between the pentaprism 17 and the finder 12.

This opening/closing mirror 18 is configured to send light from the pentaprism 17 to an image sensor 20 via a focusing lens 19. That is, the opening/closing mirror 18 is driven by its drive mechanism 21.
It is opened and closed at a position horizontal to the path of light incident on the finder 11 (solid line position in the figure), and open at a position tilted by 45 degrees (dashed line position in the figure).

The image sensor 20 constitutes a solid-state image sensor, and in this embodiment, a COD is used as the image sensor.
The resolution is improved by arranging a large number of CDs in a matrix and configuring the total number of pixels to be, for example, 400,000 pixels. A subject image for one screen is recorded on this image sensor 20, and by detecting the distribution of shading of this subject image, the image formed on it is e'r.
i5 signal. Note that C is a process for extracting signals from the image sensor 20.
Frame transfer type and interline type CD sensors are known, but either type may be used.The image sensor 20 is formed on a film wiring board 9122, and this film wiring board A semiconductor chip 23 constituting an LSI (large scale integrated circuit) is mounted on the film wiring board 22.
The image sensor 20 and the semiconductor chip 23 are electrically connected via 2.

FIG. 1 shows the internal structure and circuit configuration of this photographic device. In this photographic device, light from a subject passes through a photographic lens 2 so as to follow the optical path, is reflected by a reflecting mirror 24 installed at an angle of 45 degrees, and is reflected by a pentaprism 25.
In addition to being sent to the finder 12 through the shutter curtain 2
The reflection mirror 24 automatically springs up in conjunction with the opening operation of the film 6 and is sent to the silver halide film (photosensitive film) 27. In addition, this photographic device is a programmed auto camera that calculates appropriate exposure conditions based on film sensitivity and subject photometry, and automatically determines aperture and shutter speed. The light is measured by an optical sensor 29 such as CdS through a sub-mirror 28 provided at 24, and the output of this optical sensor 29 is detected by a light amount detection section 30.

The photographic apparatus has a one-chip microcomputer as its core, and numeral 31 in the figure is a main control section that controls various operations. Input terminal 11 of this main control section 31
An operation signal of the release button 6 is input to the input terminal . Here, the release button 6 has a two-stage push structure, and the power is turned on by pressing the button halfway (half-pressing), and the shutter is turned on by pressing the button two steps. In addition, the aperture value set by the aperture ring 4 is input to the input terminal I2 of the main control unit 31, the shutter speed set by the shutter speed dial 8 is input to the input terminal I3, and the shutter speed is set by the film sensitivity dial 11 to the input terminal ■4. The selected ISO sensitivity is supplied respectively, and the input terminal ■
5 is supplied with mode data corresponding to the switching of the mode selector 9. Here, the mode selector 9 is p (program auto), S (shutter priority auto mode),
A (aperture priority auto mode) and M (manual mode) are replaced with vJ. Further, a detection signal from the light amount detection section 30 is inputted to the input terminal f■b, and the calculation of exposure conditions is executed in accordance with this.

Therefore, the main control g4 section 31 has its output terminals 01 to 0.
6 outputs corresponding signals a1 to a6. Here, the signal a is sent to the aperture a41 control unit 32 to adjust the aperture 33, the signal a2 is sent to the mirror control unit 34 to control the upward movement of the reflecting mirror 24, and the signal a3 is It is sent to the shutter control unit 35 and the shutter curtain 26
This is a signal that controls the opening operation of the Further, the signal a4 is sent to the winding control section 36 to wind the photosensitive film 27, and the signal a5 is an electronic camera drive signal sent to the electronic recording XvJ control section 37. Further, the signal a6 is given to the mirror control section 38 as an operation command signal.

Electronic recording 1tjl 8 section 37 includes a photographing lens 2, a reflecting mirror 24. The data corresponding to the subject image received by the image sensor 20 through the pentaprism 25, the opening/closing mirror 18, etc. is sequentially read as one screen's worth of imaging data, and is written to the semiconductor memory 39 as an imaging recording medium. 31 and from its output terminal 07 via the display control section 40 to the display section 41 for display. Note that the display section 41 constitutes the liquid crystal display device 15. The semiconductor memory 39 is constituted by a RAM (random access memory), and is capable of storing, for example, 36 screens worth of image data.
Its fortune-telling and reading operations are performed under the control of 7.

Note that a signal corresponding to the operated key is inputted from the key input section 42 to the input terminal IJ of the main control section 31, and the main control section 31 executes a key processing program according to the operated key.

First, let's look at the overall operation of this photographic device. The main points will be explained with reference to Figure @5. When the release button 6 is pressed halfway from the 'lTt source OFF state, the power is turned on, power is supplied to the circuitry of the entire photographic apparatus, and accordingly the photographic apparatus becomes ready for photometry processing. In this state, if no operation is performed for several seconds (for example, 8 seconds), the device enters a dormant state and the power is turned off. Then, press the release button halfway once i1 to turn the power on again. Through this photometry process, the subject's brightness value (
EV) is calculated. In this case, the open F value of the subject is such that when the aperture 33 is open and the light from the subject is
The light is measured by being received by the optical sensor 29 via the photodetector 8.

Next, when the release button 6 is completely pressed in this photometry processing state, program calculation is executed according to the mode set by the mode selector 9, and the aperture fl or the shutter speed or both of these aperture value and shutter speed are calculated. At the same time, aperture control is performed according to the set or calculated aperture value and shutter speed, followed by shutter control, and a photograph is imprinted under these exposure conditions.

Then, frame advance control is automatically performed for the first imprinting, and this completes the series of steps T and returns to the photometric IS mode again. Although frame-by-frame advance is automatically performed by a motor after each photograph is taken, it is also possible to wind the watch by hand for normal use.

Next, the operation of the shutter priority mode will be explained in more detail with reference to FIGS. 6 to 9. here.

FIG. 6 is a flowchart specifically showing a moving object when the mode selector 9 is switched to the shutter priority mode;
The figure is a configuration diagram of the RAM that stores various information used in this shutter priority mode, Figure 8 is a program diagram for determining exposure conditions, and Figure 9 shows the field of view of the finder 12 in the shutter priority mode. There is.

Here, the RAM shown in FIG. 7 is an internal memory provided in the main control unit 31, R1 to R3 are registers for storing aperture value, R is a register for storing film sensitivity 15O (SV), and R" is a register for storing open Ff1. R11l is a register for storing photometric values according to R11 is a register for storing brightness values (EV), R
5 is a register for storing shutter speed (S), R^ is a register for storing aperture, MS is a mote register, To is a register for counting the shutter opening time, and C is a register for counting the number of shots.

First, make various settings before taking a photo. That is, the mode selector 9 switches to the shutter priority mode. Also,
For example, shutter speed 1/12 with shutter speed dial 8.
Set 5 seconds. Furthermore, the film sensitivity dial 11 is set to, for example, ASA (ISO) 100 (SV). These setting information are sent to the main control section 31. However,
After completing these setting operations, point the photographic lens 2 at the subject and press the release button 6 halfway to take a picture.
When the power is turned on and power is supplied, the light from the subject is reflected by photometry into the sub-mirror 2 with the lens open.
The light is measured by the optical sensor 29 via the optical sensor 8, and the open F value is sent to the main control section 31.

When the power is turned on, the flow shown in FIG. 6 starts to be executed, and first, photometry processing is executed. That is, 74jLt
The lh sensitivity too (sv) is stored in the RISO register (step 51).The aperture metering value (BY) of the subject measured according to the aperture F value (FO) at the 0th order is stored in the R[register (step 51). Step S2), and the brightness value (EV) of the subject is determined by the CP in the main control unit 31 according to the ISO sensitivity (SV) and the photometric value (BV) of the open F camera (FO).
Calculated by U (central processing circuit) (step S3
), and the luminance value (EV) thus calculated is stored in the REV register (step 34).

Next, the mode is determined and the second digit M of the MS register is
It is determined whether the shutter priority mode flag "l" is set in S2 (step S5). If the mode is not the shutter priority mode, the process proceeds to other processing routines, but if it is the shutter priority mode, the process proceeds to the next step S6. The shutter speed set by the shutter speed dial 8 is read and stored in the RS register. Now, assuming that the shutter speed is set to 1/125 seconds, the aperture value is 2.8 according to the program diagram in Figure 8.
(F) is calculated (step S7). Here, Figure 8 shows the correlation between the brightness value (EV) of the subject, the aperture value (F), and the shutter speed (S). As in, if the shutter speed is set to 1/125 seconds and the ISO sensitivity too (sv) is set, EV=10. The aperture value F = 2.8, which intersects with S = 1/125, is automatically determined. The aperture value A calculated in this way is used in the next step S8.
is stored in the R1 register, and this aperture value A
Based on this, the next stage upper aperture value (ll'IA+1.The next stage lower aperture value A-1 is determined and stored in the corresponding R2 register and R3 register. Therefore, in this case, R
The calculated aperture value of 2.8 is set in the 1 register, the next higher aperture value of 4.0 is set in the R2 register, and the next lower aperture value of 2.0 is set in the R3 register. And C
Increment processing is executed to increment the number of registers by 1 (step S9), and then the aperture value in the RC register, which is addressed by the value of the C register among registers R1 to R3, is read out and stored in the RA register. is stored (step 510), where the R1 register is initially designated and its aperture value of 2.8 is set in the RA register.

When such processing is completed, the main control unit 31 sends a signal a.
6 is outputted and given to the mirror control section 38 to open the opening/closing mirror 18 and set it to the position δ indicated by the broken line in the figure, and then a signal a5 is outputted from the main control section 31 and sent to the electronic recording control section 37 ( Step S11.512), whereby the light from the photographing lens 2 passes through the reflection mirror 24, the pentaprism 25, the opening/closing mirror 18, etc., and forms an image on the image sensor 20, and the light is received by the image sensor 20 for one screen. The photographic data is sent to the electronic recording control section 37, sequentially written into the semiconductor memory 39, and recorded as an electronic photograph.

When such imprinting on the semiconductor memory 39 is completed, a signal al is sent from the main control section 31 to the aperture mechanism control section 32.
is given to drive the aperture mechanism (step 313).
Then, it is checked whether the aperture movement amount has reached the aperture value of the RA register, and as a result, if Q=Rn, the value of the statement is incremented by +1, and then the process returns to step S13 to drive the aperture mechanism. Continue (Step 7)
As a result, when the narrowing down is performed according to the contents of the Rn register, this is detected in step S14 and the process proceeds to step 316, where the driving of the aperture mechanism is stopped. Signal a2 from section 31
is output and sent to the mirror control unit 34, and the reflection mirror 2
4 (step 517), then the main control section 31 outputs the signal a3 and the shutter control section 3
5, the shutter control magnet is turned on and the shutter curtain 26 is opened (step 518), and in the next step 7 319, in order to open the shutter curtain 26 by a preset shutter speed. T. After the value of the register is incremented by 1, the value of A4 of the To register and the value of the R5 register are compared, and as a result, the value of the To register is incremented by 1 until To=Rs. When the shutter speed has been released in this way, the shutter control magnet is turned off (step 521), in this case, 1/
The shutter is released in 125 seconds and the photosensitive film 27 is exposed. When such shutter control is completed, T
o After the contents of the register are cleared, the aperture 33 is returned to its original position (steps 322 and 523), and the main control section 31 outputs the signal a4, and the winding control section 36 causes the photosensitive film 27 to be The frame is wound up.

(Step 524).

Up to this point, the image is imprinted onto the photosensitive film 27 and the semiconductor memory 39 using the appropriate aperture value F=2.8 calculated based on the set shutter speed of 1/125 seconds. Once you have finished imprinting under these appropriate exposure conditions, change the exposure conditions before and after, i.e. aperture value 2.0, 4.0.
(Both shutter speeds were 1/125 seconds). That is, it is determined in step 325 whether the value of the C register exceeds "3", and if the photographing has not been completed under the exposure conditions before or after the appropriate exposure condition, the process proceeds to step S.
Returning to 9, the value of the C register is incremented by 1. Now, when the C register is incremented by 1, photography is performed with the aperture value of the R2 register of 4°0, and then the process proceeds from step S25 to step S9, where the value of the C register is incremented by 1 and the aperture value of the R] register is set to 2. Photographing is performed at .0.

Therefore, with one operation of the release button 6, images are taken continuously under the appropriate exposure condition and the exposure conditions before and after it, so three consecutive images of the same subject are taken with the electronic camera and the film under different exposure conditions. It will be photographed on camera. When such iJu&e photography is completed, the contents of the C register are cleared (step 526).

This state can be confirmed within the field of view of the finder. That is, as shown in FIG. 9, the set shutter speed r125J is digitally displayed on the display body Di, the calculated appropriate aperture value r2,8J is digitally displayed on the display body D2, and P, S, A
, M, the mode indicator D3 is lit,
Further, an indicator D4 indicating before and after the appropriate exposure condition is lit, and a number indicator D5 indicating the number of frames to be produced before and after the appropriate exposure condition is lit. This allows for proper exposure conditions (2, 8
) and the exposure conditions before and after (2,0), (4,
0) indicates that a total of three images will be taken, one for each image.

Next, the operation in program auto mode is shown in Figures 1θ to 1.
This will be explained with reference to FIG. Figure 1Theta (A) is a configuration diagram of the RAM for storing various information used in the program auto mode, and Figure 1Theta (B) is a diagram showing a state in which all exposure conditions including proper exposure conditions are stored. , FIG. 11 is a flowchart showing the operation in the program auto mode, and FIG. 12 is a diagram showing the inside of the viewfinder field of view. Here, in FIG. 1O (A), A+ "An is a plurality of aperture values corresponding to all exposure conditions determined according to the brightness value of the subject, Sl to Sn are registers in which shutter speeds are stored, Other details are the same as in FIG. 7.

Therefore, in the flow of FIG. 11, steps 531-334 first perform step 5l-34 shown in FIG.
Processing corresponding to is executed, and the brightness value EV of the subject is calculated and stored. Then, in step S35, it is checked whether the program auto mode is selected according to the contents of the first digit MSI of the MS register, and if it is not the program auto mode,
If so, the process proceeds to other processing routines, but if it is the program auto mode, the process proceeds to step S36, where program calculations are executed and the aperture image and shutter speed are calculated based on the program diagram of FIG. Now, if the brightness of the subject is EV=10, this appropriate exposure condition F=5.6,
S=1760 is obtained and all exposure conditions of EV=IO are obtained and stored as shown in FIG. 10(B) (step 537).

Then, in the following processes (steps 538 to 552), processes corresponding to steps S9 to S324 in FIG. In step 353, it is checked whether the contents of the C register are rnJ, and the preset number of shots rnJ times I! Since photography is performed by continuously changing exposure conditions, if C=n, the process returns to step 33g and similar imprinting is performed with n@'aha. Therefore, in the memory state as shown in FIG. 10(B), the aperture value is 16...1.4 and the shutter speed is 1/4...
...8 consecutive shots under the exposure condition of 11500! ! Shadows are performed. i like this! ! When the continuation photographing is completed, the contents of the C register are cleared (step 554).

FIG. 12 shows the viewfinder field of view in program auto mode. That is, in addition to digitally displaying the shutter speed 60, aperture value 4.0, and seven non-appropriate exposure shots under appropriate exposure conditions, the program auto mode indicator is lit.

As mentioned above, in the explanation of the operation, the operation in the shutter priority mode and the program auto mode has been explained, but it goes without saying that continuous shooting can be performed in the same way in other modes as well.

Furthermore, although the above embodiments have been described in the case of being applied to a camera equipped with an image recording medium of a silver halide film and an electronic recording medium, they may be applied to a normal silver halide film camera or an electronic camera having an electronic recording medium, respectively. It goes without saying that
It is particularly effective when applied to electronic cameras in which the recording medium can be used many times.

[Effects of the Invention] As explained in detail above, in this case 171, multiple shots are taken in succession under the appropriate exposure conditions obtained from film sensitivity and photometry of the subject, and under exposure conditions in the vicinity of these exposure conditions. Therefore, it is possible to avoid failures in photographing due to exposure conditions.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a blow 2 circuit diagram of a photographic device to which the invention is applied, FIG. 2 is an external perspective view, FIG. 3 is a back view, and FIG. Partial sectional view, 5th
Figure 6 is a flowchart showing an overview of the overall operation, Figure 6 is a flowchart showing specific operation in shutter priority mode, Figure 7 is a diagram showing registers in the RAM used in shutter priority mode, and Figure 8 is a program line. Figure 9 is a diagram showing the viewfinder field of view in shutter priority mode, and Figure 10 (A) is the R used in program auto mode.
FIG. 10(B) is a diagram showing the registers in the AM, and FIG. FIG. 11 is a flowchart showing the specific operation of the program auto mode, and FIG. 12 is a diagram showing the viewfinder field of the program auto mode. 6... Release button, 27... Photosensitive film, 29... Light sensor, 30...
...Light amount detection section, 31... Main control section, 32
..... Aperture mechanism control section, 35 ..... Shutter control section, 39 ..... Semiconductor memory. Figure 2 Figure 3 Figure 4 Figure 7 Figure 5 Figure 7 RO/r-ythY group Figure 8 Figure 9 Figure 12 Figure 10 (A) Ai Si Figure 10 CB)

Claims (1)

[Claims] a shutter switch, a photometer for metering light from a subject, and a calculation means for determining an appropriate exposure condition and an exposure condition in the vicinity of the exposure condition according to the amount of photometry obtained by the photometer by operating the shutter switch. and an imprint control means for successively imprinting a plurality of subject images onto a recording medium under the appropriate exposure conditions obtained by the calculation means and exposure conditions in the vicinity of the exposure conditions. Photographic equipment.