JPH02168778A - Exposure controller for electronic camera - Google Patents

Abstract

PURPOSE:To adjust properly a luminance balance of master and slave object by providing a gain control circuit outputting a gain adjustment signal to a video processing control circuit and a discrimination means discriminating whether or not the main object is located in excess of a limit to be reached by a flash light based on object distance information. CONSTITUTION:When focusing of an object is finished, a photometric sensor 6 measures the brightness of an object and a system controller calculates the charge storage time of a solid-state image pickup element 9 (that is, shutter open time), propriety of flash and timing of flashing based on the brightness information. When a photographer depresses a shutter button fully and enters release, a main mirror 3 is jumped out, a survey mirror 4 is folded and the exposure to the solid-state image pickup element 9 is started. In the backlight flash mode, the exposure is applied by natural light till the object in the background in the photographic screen reaches a voltage higher by 1Ev than that of proper exposure after the solid-state image pickup element 9 starts the exposure, flash is fired and the exposure is sopped when the main object reaches the proper exposure.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to an exposure control device for an electronic camera. Conventional technology] It has been known to control the timing of the start of flash emission in order to obtain appropriate exposure in cameras using solid-state image sensors such as C and CD. . In addition, in Japanese Patent Application Laid-Open No. 59-123825, exposure amount control (combined control of exposure time and aperture value) is performed using the photometric output measured at the peripheral area of the photographic drawing, and the flash is emitted using the photometric output measured at the central area. Amount control has been proposed, but this is intended for silver halide films. Also, JP-A No. 58-1.477] No. 9-, No. 58147
No. 720, No. 58-147722, No. 58-1477
Publication No. 23 states that if proper exposure is not achieved even after a predetermined period of time has elapsed from the start of charge accumulation in the CCD, the flash is automatically emitted, and when the appropriate fogginess is reached, the flash is stopped. , a device in which charge accumulation is also stopped is shown. Also, JP-A-60-57777, JP-A No. 60-72383
The publication discloses changing the gain of video recording when the subject distance is large and proper flash photography is conical. [Problems to be Solved by the Invention] However, none of the above-mentioned publications describes consideration of the exposure balance between the main subject and the sub-subject. That is, for example, when the main subject is far away due to backlighting, the effect of flash light photography cannot be obtained because the flash light does not sufficiently reach the main subject even if normal flash photography is performed. Furthermore, if natural light exposure is performed until the main subject reaches an appropriate level of brightness, there is a problem in that the secondary subject becomes too bright due to backlighting. The present invention solves the problem described in -1- above. When backlit, the flash light does not reach the main subject sufficiently. F
i When it comes to M, the brightness bar 7 of the 1 subject and sub-subject
C: An electronic camera that can adjust and record images and beautifully capture the main waves 7 and 7 bodies.
) aims to provide an exposure control device. [Means for Solving the Problems] In order to achieve the above object, the present invention provides a photometry means for measuring the brightness of a main subject and a sub-subject, respectively, and a flash emission control that determines the timing of flash emission based on the photometry information. electronic shutter control means for controlling the exposure time of the imaging cable having a shutter function; and a video processing control circuit for processing the accumulated charge of the imaging cable as a video signal for recording on a recording medium. , a gain control circuit that outputs a gain adjustment signal to the Hokki image processing control circuit, and a determination means that determines whether the main subject is beyond the reachable limit of the flash light based on subject distance information. When it is determined that the main subject is beyond the reach of the flash light, the exposure of the image sensor using natural light is controlled to a predetermined amount under the proper exposure, then the flash is fired, and after the exposure is completed. , an exposure control device for an electronic camera in which the gain is increased by the predetermined amount using the gain control I-roll circuit to record an image. In the embodiment described below, the flash light emission control means, electronic shutter control means, and determination means are comprised of a system controller 0, a control IC 22, etc., and the gain control circuit is comprised of a system controller 23, etc. [Effect] According to the above configuration, when shooting with natural light, the exposure value of the main subject is underexposed by a predetermined amount due to the emission of flash light, and the secondary subject (background, etc.) is further away than the main subject. Therefore, the exposure value hardly increases. After the exposure is completed, the video recording gain is increased by a predetermined amount to compensate for the undershoot of the main subject. [Effects of the Invention] According to the present invention, even when the main subject is backlit and the flash light does not reach the subject sufficiently, the difference in luminance between the luminance of the main subject and the luminance of the sub-subject is smaller than the actual luminance. The image is darkened by a predetermined amount overall, and the overall image is brightened by a predetermined amount when recording the image, so that the brightness balance between the main and secondary subjects is adjusted appropriately, and the main subject is You can take beautiful pictures. (Hereinafter, blank spaces) [Example] FIG. 1 shows a schematic diagram of an optical system according to an example of the present invention. In the figure, 1 is a photographic lens including a zoom lens, and 2 is a half mirror 13 with a low reflectance that guides a part of the light transmitted through the photographic lens to the photometric sensor 6. A main mirror that directs the light that has passed through the mirror 2 to the pentaprism 5. 4 is a sub-mirror that totally reflects the light that has passed through the center of the main mirror 3 and guides it to the focus detection sensor 7. 5 is the main mirror 3 is a pentaprism that guides the reflected light to a finder (not shown), 8 is an optical low-pass filter, and 9 is a solid-state image sensor (eg, CCD) arranged in a matrix having a shutter function. The photometric sensor 6 includes a photoelectric conversion element (for example, S P
C), which has two types of sensors: one that measures light in the center of the photographic screen in a continuous manner, and one that measures light around the periphery of the photographic screen. Further, the sensor 6 is arranged such that the distance R, b between the reflection point A of the half mirror 2 and the photometry point opening of the sensor 6 is equal to the distance Rc between the reflection point A and the imaging point C of the solid-state image sensor 9. This is equivalent to photometry being performed on the imaging surface of the solid-state image sensor 9. In addition, the sensor 6 is placed in a position where the light it receives is not blocked regardless of whether the main mirror 3 is up or down.
Even when the solid-state image sensor 9 is exposed to light when the mirror is raised, photometry can be performed at the same time. The focus detection sensor 7 has, for example, two CCD line sensors that each receive images from different injection lenses, and uses a phase difference detection method of the two images to determine the amount of focus shift or detect the amount of focus. It detects the amount of focus. In the above configuration, when the photographer presses the shutter button halfway, the outside system controller 1 to the roller calculate the defocus amount based on the output of the focus detection sensor 7, and based on this, the photographing lens 1 to focus. After the object has been focused, the photometric sensor 6 measures the brightness of the object, and based on the brightness information, the system controller determines the charge accumulation time of the solid-state image sensor 9 (i.e., the shutter opening time), and the flash The necessity of the flash and the timing of the flash emission are calculated. When the photographer presses the shutter button all the way to release the camera, the main mirror 3 flips up, the submirror 4 folds up,
” - Exposure to the solid-state image sensor 9 is started. That is, the solid-state image sensor 9 starts accumulating charges. Also,
When the photometric sensor 6 starts photometry at the same time as the charge accumulation in the solid-state image sensor 9 and does not detect that the amount of photometry has reached the appropriate exposure value, the charge accumulation in the solid-state image sensor 9 is stopped. Then, the accumulated charge is transferred to the analog memory section and the photographing is completed. In addition, in the configuration of this embodiment, while taking the configuration of an eye reflex camera, the solid-state image sensor 9 has a shutter function,
Furthermore, the diaphragm mechanism has been removed to make the camera more compact and to simplify the horizontal section. Therefore, the main mirror 3 and submirror 4 placed in front of the solid-state image sensor 9 are configured to completely shield the low-pass filter 8 and the solid-state image sensor 9 from light, and are designed to prevent light from forming on a high-brightness object (for example, the sun). Imaging or irradiation with light for a long period of time may cause
This prevents color fading (burning) of a color filter (not shown) provided on the front surface of the solid-state camera, and also prevents unnecessary charge accumulation in the solid-state photographing element 9 except at the time of release. Next, FIG. 2 shows the system configuration of this embodiment. In the same figure, ]O is a system controller 1 to 0 (CPUI) that controls the sequence of the entire camera unit, and 23
are system controllers 1 to 2 (cp'U2.) that control the sequence of the video section. Further, reference numeral 11 denotes a control circuit blower consisting of a focus detection CCD line sensor center face circuit section for driving the lens and automatically focusing (AF);
The AP sequence of 0 controls the charge accumulation function and the function of sequentially A/D converting and outputting the accumulated charges. In addition, 12 generates different power supply voltages for each circuit block 1 cock, and power supply fJ (DC/DC converter that supplies the power) 3 switches the power of the motor M to the photographing lens 1, main mirror 3, and sub mirror 4. 14 is an AF auxiliary light source (14) that adds light and dark contrast to dark objects that cannot be measured, and makes distance measurement possible.
LED) and flashing display while the self-timer is operating
A light source such as D, 15 a driving rc for driving the motor M,
16 is a Fujitokagura that generates a number of pulses corresponding to the amount of drive of the photographing lens. A photometric sensor 17 includes a sensor 17a that measures the brightness at the center of the photographic screen as a spot, and a sensor 17b that measures the brightness around the photographic screen except for the center. In addition, 18 is a flash circuit, 19 is a display circuit including an LED display circuit 1.9a in the viewfinder and an I-CD display circuit 1.9b on two sides of the camera body, and 20 is a display circuit including an LED display circuit 1.9a in the viewfinder and an I-CD display circuit 1.9b on the two sides of the camera body.20 is a light source illuminating the subject. A color temperature sensor circuit 21 measures color temperature, and numeral 21 indicates switches including a switch linked to a shutter button and a mode changeover switch. Here, each switch of the switches 21 is shown. SO is the main switch for prohibiting camera operation when F is open, and SL is for starting AE (auto exposure) and AF (auto focusing). S2 is a release start switch. S3.34 is for setting a correction amount at the camera manufacturing stage in accordance with variations in imaging sensitivity (that is, sensitivity of output voltage to a constant exposure amount) corresponding to the ISO sensitivity of the film of the solid-state imaging device 9, which differs individually. There is a switch for
Signals (A, B) to 2 pins 1 with these switches S3 and S4
are configured, and the corresponding correction values γ[Ev:] are stored in the system controller 10, ]:,
When the signals (A, , B) from the second pin 1 are input to the system controller 1 to the roller 10, the correction value γ corresponding to the signal is output from the system controller 1 to the roller 10, and the photometric sensor 1
The brightness measured in step 7 is corrected. In other words, the photometric sensor 17a performs photometry at the same time as shooting, and the timing of shutter release is controlled based on the photometric data, so the shutter speed is controlled by correcting the photometric data, and the imaging sensitivity is corrected. It is what is done. For example, (0,0)=O,OEv, (0,1)-10,3Ev, (1,0)--0,3Ev, (1,,1
)-I-0,5Ev, and if the imaging sensitivity of the solid-state image sensor 9 is 0.3Ev larger, inputting the 2-bit signal (0, 1,) to the system controller 10 is +0 corresponding to (01) from
．． A correction value γ of 3Ev is output, and the photometric brightness of the photometric sensor 17 is corrected by +0.3Ev, so the shutter speed is increased by -0.3Ev, the exposure amount is lowered by 0.3Ev, and the variation in imaging sensitivity is reduced. is corrected. Note that if the number of switches is increased to increase the number of pins and the correction values corresponding to each bit signal are stored in memory, the amount of correction can be made finer. S5 is a data switch consisting of a first switch 55-1 for selecting year, month, day, hour, and minute data 1 to information, and a second switch 55-2 to set and modify the selected data 1 to information. 1~
57-1 is a floppy detection switch that detects whether or not a floppy disc for recording video signals is loaded in the camera. Yes, 57-
Reference numeral 2 denotes a write-protection detection switch that detects whether or not write-protection is selected by a write-protection selection tab on the floppy disk. S8 is a switch that detects whether the accessory slide copier is connected, and S9 is a switch that detects whether the accessory slide copier is connected. S10 is a switch that detects the playback mode, and S11
812 is a group of zoom encoder switches for monitoring the focal length of the zoom lens; and 812 is a group of zoom encoder switches for monitoring the focal length of the zoom lens. S13 is a forced flash switch that forces the flash to emit light regardless of the brightness of the object covered by the flash.
4 is a flash prohibition switch for forcibly disabling the flash, and S15 is a mode changeover switch for switching between single/self-timer shooting mode. ], /] Next, 22 is a control IC, which is a control circuit that controls the drive of each actuator such as the DC/DCC/type controller 12 and clutch 13 based on the control signal from the system controller 10, and the solid-state imaging cable 9. A of the photometric data based on the shutter speed and the light emission timing 17 of the flash circuit 18
/D conversion circuit, appropriate exposure detection circuit, etc. To explain this control IC 22, the voltage control circuit 2
2a is DC/D by DC/DC control signal.
The clutch control signal 22b controls the on/off of the clutch 13 using the clutch control signal, and the self-control circuit 22c controls the light emission of the light source 14 using the self-control signal to control the motor. The circuit 22d controls starting of the motor M using a motor control signal. In addition, the photo interrupter 22e
1 counts the number of pulses corresponding to the amount of lens rotation output from the photo coupler 16 and outputs them to the system controller 1 to the roller 10. Further, the amplifier circuits 22f1 and 22f2 convert the output currents of the spot photometric sensor 17a and the peripheral photometric sensor 17b into logarithmically compressed voltage signals, respectively, and output the signals. It is input to the multiple integral control circuit 22g. Further, the control circuit 22g switches the switch SW1 to collect the analog signals output from the amplifier circuits 22f1 and 22f2, converts them into digital signals, and sequentially outputs them to the system controller 1 to the roller 10. 22i is a circuit for causing the solid-state image sensor 9 to start exposure in response to the "shaft open" signal, and for determining whether the exposure amount has become appropriate based on a detection signal from the photometric sensor 17a. The configuration of the circuit 22i for detecting this proper exposure is such that the common terminal of the switch SWI is connected to the common terminal of the switch SWI via the adder M1.
connected to the base of transistor Q,
has its emitter grounded and its collector connected to the inverting input terminal of comparator CP. Further, the collector of the transistor Q is connected to the negative electrode of a capacitor C, and the positive electrode of the capacitor C is connected to a power supply terminal Vcc (not shown). Further, the power supply terminal Vcc is connected to the positive pole of the constant voltage source B, and the negative pole of the identified voltage source B is connected to the normal input terminal of the comparator CP. In addition, a switch SW2 is connected between the positive and negative electrodes of the capacitor C.
is connected, and the switch SW2 is controlled to open and close by the output of "Shutter open" from the system controller 10. In the proper exposure detection circuit 22i, when the switch SW2 is switched from "closed" to "open" by the above-mentioned "shutter open" signal, the capacitor C is charged by the collector current of the transistor Q, and the negative terminal of the capacitor C is charged. Potential (V
) falls and becomes lower than the normal input terminal voltage (Vo) of the comparator CP, the output of the comparator CP is inverted to detect proper exposure, and this detection result is used as a signal to command the shutter to close. It outputs to the system controller 10 and the shutter control circuit 22n. next. [D/A conversion circuit 221] is a luminance correction amount output from the system controller I/roller 10, for example, the above-mentioned I/A conversion circuit 221].
The adjustment amount for SO sensitivity variation adjustment is converted from the digital 1 raw signal to an analog signal, and the correction signal is input to the adder M1 and added to the light reception signal of the photometric sensor 17. The battery check circuit 22j checks the capacity of the battery. Further, the flash control circuit 22J) outputs a trigger signal for flash emission J to the flash circuit 18 in response to a flash emission signal input from the system controller 10. In addition, the flash control circuit 22
m is the flash circuit 18 by the "boost start" control signal.
It controls the charging of the main capacitor for light emission (hereinafter referred to as flash circuit charging), detects the charging state of the flash circuit 18, and outputs a charging completion signal to the system controller 10. 22n is a shutter control circuit that outputs a shutter opening/closing signal;
The shutter "open J" and "close J" control signals are sent to the system controller 23 and the time controller 1 to roll circuit 24 by the control signal for "open" and the detection signal from the proper exposure detection circuit 22i, or the forced termination signal from the system controller 10. The time control I/roll circuit 24 controls the start and end of exposure of the solid-state image sensor 9 based on the shutter "open" and "close" control signals inputted from the shutter control circuit 22n. The video processing control circuit 25 is connected to the system controller 1~
The video signal is adjusted based on the gain correction amount input from the roller 10 and the color temperature information input from the system controller 23. Also, the recording track is adjusted from 11 to 10 by the field/frame recording signal input from the system controller 23. It also controls two tracks. The details of the gain correction amount will be described later, but
"Frontlight", "Backlight", "Far", "Flash mode",
Determined by each mode such as "forced flash" -1. , OEv
, -0,5Ev, -1-0,5Ev, +1. , is the compensation amount of OEv. Further, 26 is a magnetic head and a disk for recording, and 27 is a spindle motor that rotationally drives the disk 26. Also, from the system controller 1 to the roller 23, map information (information on empty 1-rack, recording end track information), system controller I, information such as recording, head feeding, etc.
The switch reception of the roller 10 sends information such as disapproval. Next, in FIG. 2 showing the system configuration, a shutter control circuit 22 which outputs shutter "open" and "close" signals for shutter opening/closing operations, a proper exposure detection circuit 22i, and a system controller 1-IT7- The explanation will focus on La 10. First, open the shutter from Sysdemcon I-10
When the signal η'''J('' is output, it is input to SW2, starts charging the capacitor C of the detection circuit 22i, and is also input to the EXOR circuit 31 of the shutter control circuit 22n. 'L' on the input terminal at the end
is being input, the EXOR circuit 31 outputs ``H'' to the time controller 24 and system controller 23 to start exposure of the solid-state image sensor 9. In addition, the system controller 10 outputs the shutter "open" signal only when the flash is required, and at the same time starts the flash emission time time count 1~, and when the time count of the flash emission time is finished, the system controller 10 outputs the shutter "open" signal. A flash trigger signal is output to the repower circuit 22fJ, and the flash starts emitting light. Next, when the detection circuit 22i detects proper exposure, the comparator CP connects the system controllers 1 to 0-ra 10 and the OR circuit 32.
The shutter "close" signal "H" is output. OR circuit 3
2 receives the output of -F record I('' and outputs "H" to the EXOR circuit 31, and the EXOR circuit 31 receives the shutter "open" signal "11" inputted to the input terminal at the other end. ”, it outputs “L” and notifies the system controller 23 and time controller 24 of the end of exposure. Also, the timing at which the shutter “close” signal is output from the detection circuit 22i is later than the predetermined time (camera shake limit time). In this case, the system controller 10 outputs a forced termination signal "I-1" and notifies the end of exposure in the same way as the above operation. (
(details will be shown later) is calculated and output to the video processing control circuit 25. 28 is system controller +7-ra 10 and system controller l-
This is a communication line for the roller 23, and the system controller 10 sends switch/Ft information signals such as Sl, S2, date, playback, field/frame, slide copier, negative copier, write or write inhibit, floppy detection, etc. and spindle motor ON/OFF, current 1 to easy N. Control signals such as the following are sent. Next, the photometry mode classification of subject brightness based on IU+light information will be explained using Table 1. As shown in the table, the metering mode for subject brightness can be divided into "bright" mode, which allows you to shoot with natural light, and "dark" mode, which requires supplementary light from Franche. "Dark"
For each of these cases, there is a case of [frontlight] where the brightness of the main subject on the shooting screen and the brightness of the sub-subject in the background is properly balanced, and a case where the brightness of the main subject on the shooting screen is relative to the sub-subject in the background σ゛). 9 (1
It will be done. Note that "front light" also includes reverse light. In addition, "Fludge", "Fludge", :r, and "tl" are automatically set based on the photometry results for each of the four types of photometry modes. )
ii Determine the age and select the appropriate photography method [OI-
With Mode J, you can forcibly fire 1], U, and 7Y regardless of the metering result. Three types of shooting modes correspond to the "Flash Prohibition Mode", which is a mode in which the flash is forcibly inhibited. and 1-Flash Prohibition Mode", and "Flash" or "AE (Flash Prohibition) J" indicates the shooting mode selected by "O1-Mode". By the way, "Photography method in a series of shooting modes" In terms of whether or not a flash is necessary, there are two types: natural light mode, which takes photos using only natural light without using a flash, and flash mode J, which uses both natural light and flash light without firing the flash. In the classification of photometry modes in Table 1 (described below), 1-flash prohibition J and rAE (flash prohibition) are classified as natural light mode J, and ``forced flash'' and ``flash'' are classified as ``flash mode.'' Next, we will explain how to take pictures in the shooting mode for each metering mode in this embodiment. When shooting with , the brightness of the sub-subject is relatively bright compared to the brightness of the main subject, so if the main subject is shot with the appropriate exposure, the brightness of the sub-subject in the background will be bright. Therefore, when the main subject is properly exposed by correcting the metered main subject brightness by +0°5Ev, the exposure is stopped.By performing such shooting, the main subject is properly exposed. 0.5 than exposure
Although the image is shot at a low Ev, the background is prevented from being too bright, resulting in a beautiful overall image. Next, when shooting in "dark backlight" with 1 flash prohibition mode J, the brightness of the sub-subject is relatively brighter than that of the main subject, but the brightness of the sub-subject in the background is darker, so the main subject Even if the subject is photographed with proper exposure, the secondary subject in the background will not be photographed excessively brightly. Therefore, the photometered brightness of the main subject is not compensated for, and the main subject is photographed with proper exposure. In addition, in ``When shooting in flash prohibition mode J and rAE (flash prohibition) at dark frontlight 1'', [In the case of bright frontlight J, the balance between the brightness of the main subject and the brightness of the sub-subject is relatively appropriate. In this case, the brightness of the entire shooting screen is bright and dark, so the average brightness (Bvs') is calculated by taking into account both the brightness of the main subject and the brightness of the sub-subject, and calculating the weighted average of each brightness. Take a picture with the average brightness or appropriate exposure. Note that when the luminance of the entire photographic screen is extremely low as compared to the limit value of photometry, the average luminance is set so that the luminance of the sub-subject is weighted more heavily than the luminance of the main subject. Also, if the brightness of the shooting screen is significantly below the photometry limit, the shutter release will be released and shooting will not be possible. (2) Regarding "flash mode j": In this mode, in "forced flash mode", it is thought that the photographer's intention is to use the flash light source regardless of the brightness of the main subject. Regardless of the metering mode, the flash is emitted by the shutter open control signal, and the image is taken so that the main subject is at the appropriate exposure point. In addition, in the case of "bright backlight" (hereinafter referred to as "backlight flash mode"), the luminance of the metered subject is -1.
,, OEv correction is applied to calculate the exposure time for the sub-subject, and if the exposure time A and PEX value obtained by subtracting the correction value 10Ev from item 1 is TV, then after the start of shooting, the above exposure time After exposing to natural light up to T'v, a flash is emitted and when the main subject becomes suitable, the exposure is stopped and photographed. In other words, natural light makes the background 1. E v A photograph is taken in bright light, and then the main subject is properly photographed using flash light. 51: By taking eel photography, you can capture the main subject beautifully, and
The sub-subject is photographed brightly compared to the main subject, creating a backlit atmosphere. In addition, in the case of "dark backlight" and "dark frontlight 1" (hereinafter referred to as "dark flash mode"), the main subject's brightness is multiplied by +-1, OEv, and the main subject is Calculate the appropriate exposure time and calculate the correction value 1.OE
When the APL X value of the exposure time with v added is Tv,
After shooting starts, after exposure with natural light until -1- placement light time Tv, when the flash is fired and the main subject becomes appropriate,
Shoot with the exposure stopped. That is, the main subject is photographed using natural light IEv darker than appropriate, and then the main subject is photographed appropriately using flash light. By the way, in the above embodiment, the exposure time corresponding to the flash emission timing time is divided into the backlight flash mode J and the dark flash mode.
There is a method of calculating the exposure time with the solid-state camera f 90) at the same time as the start of exposure, but from the photometric information of the event, the emission W of the flash 2, the tie and the case.・
Instead of calculating the elapsed time,
In mode I, the secondary subject can be measured directly at the same time as the exposure of the solid-state imaging element 0 for each -L subject in the dark flash mode with one drop. ), [In backlight-7 lash mode 1, the sub-subject brightness is measured to tie 1/I- at the same time as the solid-state sensor i' 0 starts exposure, and the flash is fired when the brightness is 1.OEv higher than the appropriate (g) Come on,
The exposure is finished when the main subject is suitable.
"In the dark flash mode j, at the same time as the exposure of the solid-state imaging probe 9 starts, the luminance of the 6J main fracture body is measured to the die reflex 1~,
Appropriate I[-1. The flash may be emitted when OEv is low, and the exposure may be terminated when -) the self-covering body reaches W'jE. This completes the explanation of the photographing method in each photographing mode, and next explains how the photographing modes are divided into modes based on the brightness of the subject detected by the photometer. The photometric sensor 17 is composed of two types of photometric sensors: a photometric sensor 7a that spot-meters the brightness at the center of the photographic screen, and a photometric sensor 17b that measures the brightness around the photographic screen. For example, when photographing a person, the main subject is placed in the center of the shooting screen.
Since the background, which is the secondary subject, is often placed around the shooting screen, the luminance of the main subject and the luminance of the secondary subject are measured separately. The brightness at the center of the photographic screen (hereinafter referred to as central brightness) is taken as Bvl, the brightness around the photographic screen measured by the photometric sensor 1.7b (hereinafter referred to as peripheral brightness) is taken as Bv2, and the brightness of the main subject is Let Bvs be the brightness of the sub-subject, and BvA be the brightness of the sub-subject, then the photometric value Bv2 is the brightness Bv^ of the sub-subject such as the background.
However, it is known that an error occurs when the photometric value Bv1 is used as the brightness Bvs of the main subject. For example, if the main subject is small compared to the shooting screen and is backlit, the background light will wrap around the main subject, the photometric value Bv1 will be larger than the main subject brightness Bvs, and the shooting lens or zoom lens in the case of,
If you arbitrarily change the ratio of the size of the main subject to the shooting screen by zooming, the photometric value B will change according to the ratio.
The error between v1 and the main subject brightness vs is different. The photometric value Bv is determined according to this slant, the ratio of the size of the main subject to the shooting screen, and the brightness difference between the main subject and the sub-subject.
It is necessary to correct l to obtain the main subject brightness Bvs. That is, if this correction amount is α, the main subject brightness Bvs
is expressed as Bvs-B■1-α mountain■. Note that the unit of subject brightness is expressed in Ev value. Table 2 (described later) is an α map representing the supplementary IF amount α. In the same table, β does not indicate the size of the subject relative to the photographic screen and is the photographing magnification, and ΔBv is the difference between the peripheral brightness Bv2 and the central brightness Bv1, that is, ΔBv=Bv2−Bv
It shows l. As shown in Table GJ, when β becomes smaller, the ratio of the size of the subject to the shooting screen becomes smaller, and the amount of light that wraps around from the surrounding objects to the photometric sensor 1.7a increases, so the correction amount α The value of -
)ing. Also, when ΔBv increases, the brightness of surrounding objects is brighter than that of the main object ( , reverse so(;I)'y strong RuruQ)
Then, from the surrounding subject, the photometric sensor 1. '? The lick correction (α) value, which increases the amount of light that goes around to i'i, is now very attractive. However, when β is smaller than 1/100, the ratio of the size of the main subject to the shooting screen is very small, and the shooting screen is "-7" and the main subject is no longer seen as the main subject, so the correction amount α is not included. l: There is C at 5. In addition, when ΔBv is 2.75 or more, it can be concluded that the amount of light that wraps around from the secondary subject to the photometric sensor is small. In other words, compare whether the subject is alone in strong backlight. However, since the main subject is considered to be a relatively large object, the value of the correction amount α is set to a small value of 1 to take advantage of the shooting conditions. Here, G modes of front light 1 and 1 backlight J based on the main subject brightness Bvs and sub-subject brightness BvA of -1 will be explained. If the brightness difference (BvA - Bvs) between the sub-subject brightness BvA and the main subject brightness F3 v s is ΔBv', then if the sub-subject brightness is larger than the main subject brightness by a certain value (δ) If ΔBv'> δ, it is assumed that the sub-subject is brighter than the main subject (backlight), and ΔBv'
When v'≦δ, it is assumed that the brightness of the main subject and the sub-subject is balanced, which is "frontlight". Table 3 <f&) is a δ map giving the above constant value δ. The δ values in the table are determined through actual photography, etc., and the δ values change in three levels depending on the brightness of the main subject. This is because as the brightness increases, the amount of light that wraps around from the periphery to the center increases, making it difficult to detect backlight, and the constants in Table 3 are selected to accommodate this. Next 1. The classification of flash emission modes will be explained. If the exposure time is long and the limit brightness that causes camera shake (hereinafter referred to as camera shake limit brightness) is BvH, then when the overall brightness of the shooting screen is lower than the camera shake limit brightness Bvll, the flash is fired to take a picture. Set to "flash mode". By the way, for the overall brightness of the shooting screen, since the main subject brightness and the sub-subject brightness are different, the weighted average value Bvs' of the main subject brightness BVS and the sub-subject brightness BvA that takes into account the respective brightnesses is calculated as the overall brightness of the shooting screen. It is used as the average brightness of In the case of "Front light", Bvs' is given by Bvs' = Bvs/4 + (3-BvA)/4, and when Bvs'≧I-3v H, it is defined as [Front light flash mode], and T3vs'<Bvll , the entire shooting screen is dark, so use "U dark flash mode." In addition, in the case of "backlight", the sub-subject brightness is higher than the main subject brightness, so the value obtained by subtracting the above δ from the sub-subject brightness Bv^ (BvA -
δ) will be used. In other words, when BvA-δ≧Bvll, the background is bright and the main subject is dark due to backlighting, so the flash is fired [backlight flash mode J is set and Bv8-δ(
When B v l-l, Bvs≦Bv8-δ [3v
From If, even though it is backlit, the entire shooting screen is dark, so we set it to "dark flash mode". In addition, if the center brightness Bv1 is low enough to reach the photometric limit value of the photometric sensor 17a, the reliability of the photometric value is low, and the sub-subject brightness BvA is compared to the main subject brightness Bv regardless of whether it is frontlit or backlit. Weighted average value B v
s ′ is used to perform processing in “low brightness processing mode”. That is, B v s ′= B v s / 8
-1- (7-B v 8) / B calculated by 8
v s ′ is used to process it as a [dark flash mode]. "Natural light mode" and "dark flash mode" for my son
, ``backlight flash mode'' and ``forced flash mode'', the control of the exposure time of the solid-state image sensor 9 and the control of the flash light emission timing time will be explained. FIG. 3 shows an example of the exposure time of the solid-state image sensor 9 and the timing time of flash emission. In the same figure, t
H (=2-TVH) is the limit exposure time (
camera shake limit shutter speed), and the zoom
1-Evening sunrise J+, that is, it is changed according to the value of the focal length f of the lens. t H<-2T V X > is the highest shutter speed that can control the exposure time of the solid-state image sensor 9, and to is the above t
The time obtained by dividing H into two is reduced. In addition, -1゛■tA (=2) is the delay time from when the solid-state image sensor 9 starts exposure in response to the shutter start signal to when the flash starts emitting light; [In flash mode J,
After being exposed to natural light for a predetermined time tA, a flash is emitted. Furthermore, t[ indicates the time during which the flash is emitting light, and ts indicates the time at which proper exposure is achieved. (1) “Natural light mode” will be explained. The "natural light mode" is divided into three types of photographing methods, which will be explained below, depending on the brightness of the main subject. ■If the brightness of the main subject is very bright and the proper exposure is reached within the time of the maximum shutter speed t, H,
It is exposed until the ivy speed time tH, and the time (tM-t, s) exceeding the time ts at which the cloth tip of the appropriate W is obtained is overexposed, so that the photographed image is not reflected in the image processing control circuit 25. Exposure correction (-θ) is performed by decreasing the gain at . By the way, since the exposure time of LH,'2 corresponds to the overexposure of IEv, t s S t o (however, to=
+LH, /'2) and LH'',>ts>to, the system controller 10 changes the Cain correction amount and outputs it to the video processing control circuit 25/\\.In other words,
If it is ts, excessive exposure time (1s) L
Since it is shorter than J L H / 2, the constant gain t
, O) is decreased, and when t)I>ts>to, the excessive exposure time (tH-ts) is longer than tM/2, so the constant gain of 0.5Ev is reduced. . ■ “When proper exposure can be obtained in a time shorter than the camera shake limit shutter speed t 11. When proper exposure is taken using only normal natural light.
The photographed video is recorded without exposure correction by the video processing control circuit 25. ■ Time ts when the brightness of the main subject is dark and reaches the appropriate exposure
exceeds the camera shake limit shutter speed t11. Camera shake limit shutter speed t to prevent camera shake
Exposure is forcibly stopped at H, and the gain of the image photographed by the image processing control circuit 25 is increased by 0.5 Ev to correct the underexposure. (2) “Dark flash mode” will be explained. In the "dark flash mode", after the solid-state image sensor 9 starts exposure, the main subject in the shooting screen is 1.0
Until the time when Bv reaches a low value (this time is defined as tA),
exposed by natural light, then a flash is fired,
Exposure is stopped when the main subject becomes suitable. In this "dark flash mode J," there are three types of shooting methods depending on the brightness of the main subject. When the exposure is reached. ■ If the time tS at which the proper exposure is reached after the flash fires, exceeds the camera shake limit time shi11 (in addition, when the flash is fired at 7 = tH and the proper exposure is not obtained after the light emission time t[ends r]) In the case of (1) and (2) above, the exposure is stopped when the proper exposure is obtained, and the photographed image is recorded without any exposure adjustment in the image processing control circuit 25. (2) In this case, when the camera shake limit time tH has elapsed, in order to prevent camera shake, the exposure is forcibly stopped, and the video processing control circuit 25 increases the gain of 0.5Ev to compensate for the underexposure. (3) [Backlight flash mode] will be explained. In [Backlight flash mode 1 ~], after the solid-state image sensor 9 starts exposure, the secondary subject in the background in the shooting screen has an IEv value higher than the appropriate exposure. The camera is exposed to natural light until the time (this time is ta), then the flash is fired, and the exposure is stopped when the main subject is properly exposed.In this "backlight flash mode", the subject There are two types of photography methods depending on the brightness of the flash. ■When the proper exposure is reached while the flash is firing. ■When the proper exposure is not reached even after the flash fires and the flash fires. In the case of ■, the exposure is stopped when the appropriate exposure is obtained, and the photographed image is recorded without exposure correction by the video processing control circuit 25.In the case of ■, [In backlight flash mode j, the background is bright Since the object is to be photographed, if the main subject is exposed until the time ts at which the main subject is properly exposed beyond the flash emission time, the sub-subject will become excessively bright due to exposure to natural light after the flash has finished firing. The image processing control circuit 25 forcibly stops the exposure after the light emitting time tl and processes the captured image.
No exposure correction is made. Next, if you are in backlight flash mode J and the distance between the three main subjects exceeds the limit that the flash light can reach, the solid-state image sensor 'f9 starts exposure and then the flash fires as described above. The exposure is performed by natural light for a time that is 10Ev added to the delay time t^ (this time is set as tA' = tA/2), then the flash is emitted, and after the flash is emitted, the exposure is stopped. As in "Flash Mode", the time t when the main subject is properly exposed.
If s exceeds the flash emission time t, the exposure is forcibly stopped after the flash emission time t, and the image processing control circuit 25 increases the gain by 1.OEv to stop the exposure. In other words, in "backlight flash mode" where the distance to the main subject exceeds the limit that the flash light can reach, the flash cannot effectively serve as auxiliary light for the main subject, so the exposure time using natural light is The exposure time was shortened to half of the natural light exposure time in "Flash mode", and the image was taken so that the overall image was darkened by Ev, then the flash was fired and the exposure was forcibly stopped after the flash was finished, and the photograph was taken. Increase the overall gain to 1 at the video stage.
．． E v increases. Then, in this way, the overall IEv is lowered so that the difference in brightness between the main subject and the sub-subject is smaller than the actual brightness difference, and the overall Ev is raised by 1 at the video stage. Since the correction is made, the main subject can be photographed clearly, and the brightness balance between the main subject: the body and the sub-subject can be properly adjusted. Here, the flash emission timing time tA is the time from the start of exposure of the solid-state image sensor 9 until the flash is emitted, and is based on the measured main and sub-object brightness.
It is calculated by o-ra10. (4) “Forced light emission mode” will be explained. In forced flash mode J, when the maximum shutter speed t141 has elapsed after starting exposure, the flash is fired and the exposure is stopped when the main subject is properly exposed. When the time exceeds the camera shake limit shutter speed tH, the exposure is forcibly stopped when the camera shake limit shutter speed tH elapses in order to prevent camera shake, and the image processing control circuit 25 detects the insufficient exposure. This is corrected by increasing the gain of 0.5 Ev. Next, the system controller installed in the electronic camera of this embodiment
A sequence for controlling the camera section of the roller 10 will be explained. About the main routine, see flowchart 1 in Figure 4.
This will be explained using ~. When the camera is first loaded with batteries, the system controller 1-u-ra]0 is reset to the initial 1tJ] state (#5), and the initial setting subroutine is executed. 10 initial settings are performed (#10), and then, in steps #15 to #30, it is checked whether the camera is in the shooting state. In other words, whether the power supply battery is turned on (#1.5) or the "playback mode" is set to 31 with the playback switch S10! Is it not accurate? (#20)
At each step, it is confirmed whether the deck lid is open (125) and whether the deck lid has changed from "open" to 1-closed (#30). Note: If the battery is not inserted in each step, execute the [Battery removal J subroutine (#
200). If the "playback mode" is selected, a "playback" subroutine is executed (#210). When the deck lid is open, execute the "Prohibit recording/playback" subroutine to prohibit both recording and playback (#2
20). When a floppy disk for recording is inserted and the status of the tray changes from "open" to "closed,"
The initial load j subroutine is executed, the information on the floppy disk is checked, and the information is loaded into the system controller 10 (#500). Next, check whether the main switch SO is turned on (#35). If the main switch SO is OFF, shooting will not begin, so proceed to #11o, set the shooting lens 1 to the initial position, and turn off the display on the LCD display circuit 21a. #1.15 > If the flash circuit 18
If you want to boost the voltage to charge it, proceed to #145.
Stop the boost and turn off the flash charging LED display (red) in the viewfinder (#150)
, l-■A Enters IT state (#160). H.A.L.
In the T state, the execution of the sequence of the system controller 1-0-10 is suspended, and the settings of the switches 21 are checked at regular intervals to see if there are any changes (#170). If there are no changes in the settings, the If the T state is continued and the settings have been changed, return to #15. If the main switch SO is turned on, check if the switch SO has changed from OFF to ON (#
40>. When the main switch SO is turned ON for the first time, set the step-up necessary J flag to charge the flash circuit 18 (#45). If the main switch SO is not turned ON for the first time, skip #45. Display is performed on the LCD display circuit 21a (#50). In addition, I-CD
In the display circuit 21a, field/frame and single/
Displays self-timer mode selection, number of shots counter, battery warning, recording mode, etc. Next, make sure that the start switch S1 of AE and AP is ON (#55). Check the presence (#60). This means that when switch S1 is pressed again, A, E, A,
F is performed, and if switch S1 is held down, no new AE or AF is performed. If this flag is not set, execute the "Sl" subroutine and perform AE (automatic exposure) and AP (automatic focus) (
#800). If switch S1 is OFF or [Press and hold J flag or Sera I], then check whether there is a change in each mode of single/self-timer, field/frame, and date information switching ( #
65). That is, when none of the single/self-timer mode changeover switch 315, field/frame mode changeover S11, and date information mode changeover 55-1 is held down, the switch S15.311.55-1 is pressed. are checked in order to confirm whether the mode has changed (#70 to #80). And #7
0: single/self-timer mode selector switch S
If 15 is ON, the [mode change] subroutine of #230 is executed. Date changeover switch 5 with #75
If 5-2 is ON, the subroutine #240 "1 CHI/CHANGE" is executed. If the field/frame mode changeover switch S11 is ON in #80, #2
50 [Field/Frame Change] subroutine is executed, and if there is no change in each mode, Day 1 ~ (Date)
Make sure to check if there is one pot correct (#85). If any switch is held down, there will be no mode change, so there is no need to check each mode switch. <#70
~Skip #80), proceed to Day 1 ~ Modification (#85). If date correction switch 55-2 is pressed, #2
60 "Day 1 to Repair ■" subroutine is executed. If the date information has not been corrected, then the necessity of flashing is checked (#90 to #1.05). This is to set a flag in order to identify whether or not boosting the voltage for charging the flash circuit 18 is necessary depending on whether or not flash is required. #90 If the "forced flash" switch S13 is pressed, set the "boost required" flag #9
5), If the "light emission prohibition" switch S14 is pressed in #100, [Set boost unnecessary J flag (#1
05). Next, check whether there is a "boost required J flag", and if it is, start boosting if charging is not completed,
When the flash is charging inside the finder, turn on one LED display b (red) (#], 20~#], 35)
. Then, check the boost time (#1, 4.0>,
When the pressure increase is completed within the predetermined time, return to #]5. Here, if the voltage increase is not completed within the predetermined time, a battery check is performed (#270). Also, #1
If the "boosting required" flag is not set in 2o, or if charging has already been completed in #125, the above #
Proceed to steps 145 to #170 and enter the HALT state. When each subroutine ends, the process returns to step #15 (A>. Next, the subroutine #500 "1 Initial Load" will be explained using FIG. 5. First, the battery check subroutine is executed. , check the battery capacity (#505).Next, check if a floppy disk is inserted (#510), and if it is not inserted, execute the subroutine of #700 that does not allow Lullies, mirror 3, and take a picture. Prohibit driving other than rinse 1 I
View. If inserted, the DC/DC cable is used to supply power to the spindle motor 27 and video processing control circuit 25.
The DC converter 12 is activated (#515). Next, the spindle motor 27 and the video processing control circuit 25 are driven (#520), the content written on the floppy disk 26, that is, the take of 50 tracks is read, and a map is created. Furthermore, the track that is being counted up is displayed on the LCD display circuit 1.9b, without indicating that the contents of the floppy disk 26 are being checked (<#525). Next, check whether 1 playback mode J is selected with the playback switch S10 (#530), and if [playback mode] is selected, execute steps #535 to #545 to enter the "playback mode". In other words, check to see if there is a recording prohibition claw on the floppy disk 26 #535>, and if there is no claw, recording will be prohibited, so set the "Erase Prohibited" flag to Sen1-L.
(#540), recording is allowed if there is a nail, so set the "erasable" flag (#545), and select "
Proceed to the "Playback Mode" subroutine. If "Playback mode" is not selected in #530, check whether there is a recording prohibition claw on the floppy disk 26 (#550). If there is no claw, check the "
"Prohibit recording" should be displayed on the LCD display circuit 19b #555
), the recording operation is stopped (#570). Also, check if there are any free tracks on the floppy disk 26 (#560), and if there are no free tracks, check if there are any free tracks on the floppy disk 26.
- Display that there is no rack on the CD display circuit 19b (#565), and stop the recording operation in the same way as when there is no rack (#570). If there is an empty track, #600
Proceed to #15 of the main routine, move the head to the unrecorded track based on the map information obtained in #525, and then proceed to #15 of the main routine.
to return to. Next, “Sl” of #800 executes AE and AP etc.
The subroutine will be explained using FIG. “S.
1'' subroutine sequence executes AF, executes AE after focusing on the subject, prepares the flash to emit light if necessary, and enters release. #805 to #8 before entering Masu, A, and F
At step 35, a battery check, power supply, system controller 23, white balance, etc. are prepared. That is,
When boosting the flash circuit 18, stop the boost (#805) and perform a battery check (#805).
810), white balance (WB) should be set to a specific color temperature for daylight #815), solid-state image sensor 9,
In order to supply power to the video processing control circuit 25, spindle motor 27 and other circuits, start the DC/DC converter (#820) and reset the system controller 23 (CPU 2). #825),
The color temperature sensor circuit 20 is activated (#830). Next, execute the AF subroutine #1.200 (described later), perform a focusing operation on the subject (#835), and confirm that the low contrast tilt focus detection result is unreliable and the focus is incomplete. In this case, the out-of-focus display will be displayed in the viewfinder.
Return to main routine #15 (#84.O~#
850). When focusing is completed in #840, check that the self-timer mode is selected #855
), when the self-timer mode is not selected, the spindle motor 27 is activated to drive the floppy disk 26 to prepare for recording (#860). If the self-timer mode is selected, there is no need to drive the spindle motor during the time until release, so #86
0 is skipped and the color temperature information of the light source is read from the color measurement information of the subject by the color temperature sensor circuit 20 (#865)
, detect whether the light source is a fluorescent lamp or tungsten light (#870). When the light source is a fluorescent lamp or tungsten light, select the ``Flash Required 1'' flag (#875) to fire the flash and take a picture. The color temperature distribution is different, and it is better to take pictures with a flash light close to sunlight, so the flash is automatically fired. Without setting the flag to sen 1~, execute the subroutine #i500 "Photometering-1" described later and measure the brightness of the subject (#88
0). Next, when the metering of the subject brightness is completed in #880, #88
In steps 5 to #905, various flags are checked to confirm whether or not a flash is necessary. First, check the front right of the "Flash Required" flag (#885), and see if the flag is set.
Or, if the flag is not set to 1 or 1, but 1 forced flash mode is selected (#890), then check whether flash prohibition mode J is selected (#895).
. "Flash prohibition mode J is not selected (if J is flash mode, please check whether #890 r forced flash mode" is selected #905), and if it is selected, "forced flash mode" Set the flag to 1~ (#9
], 0), check the state of charge of the flash circuit 18 (#915>. Setting the "forced flash mode" flag to sen 1 in #910 means that the flash is activated at "forced flash 1 o'clock" and "o1 mode" This is to identify the different light emission timing times.Next, if charging of the flash circuit 18 is completed in #915, the R pressure for charging should be stopped (#920), #8
If the spindle motor 27 is not started at step 60, the spindle motor 27 is started and preparations are made for recording to the floppy disk 26 (#925), and the LED display 19a (green) indicating flash charging completion is displayed in the viewfinder. ) and do (#
930), the process proceeds to #970, and the release switch S2 is checked. If charging of the flash circuit 18 is not completed in #915, start boosting the voltage for charging #935
), if the spin wheel motor 27 has been activated in #860, its driving is stopped (#940), and the display 19a (red) indicating that the flash is being charged is displayed in the viewfinder (#945). The reason for stopping the driving of the spindle motor 27 at #9/10 is to avoid unnecessary current consumption since there is no need to drive the spindle motor 27 during preparation for flash emission. Next, check the state of switch S1 (#950),
If it is OPF, return to main routine #15 and OPF.
N If so, please check switch S2 #955
), if the switch S2 is ON, the process returns to #15 of the main routine and the flash charging L in the viewfinder is displayed.
ED display 1.9 Turn off a (red) (#965),
Proceed to #920 to #930 described above. By the way, if #890 "forced flash mode" is not selected, the flash will not fire, so just press #890.
Proceeding to 970, the release switch S2 is checked. In addition, in #895, the flash will not fire even when flash prohibition mode J is selected, so 1 forced flash will be disabled, giving priority to O1~Mote, and #
Change the daylight color temperature set in 815 to #86
Based on the colorimetric information input in step 5, the temperature sensor circuit 20 changes it to a signal for adjusting the color balance of the photographed image and outputs it (#900m. Proceed to #970. Next, check the release switch S2. #970 )
, if the switch S2 is turned OFF, the switch So
, Check Sl (#], 030~#1035),
If either is OFF, the process returns to #15 of the main routine. If both switches S01 and S1 are ON, check whether the deck is opened or closed early.
), if the lid of the disc is closed, the process returns to #865, and if it is open, the routine of #220 is executed to prohibit all recording and playback operations. If release switch S2 is turned on in #970,
Make sure the self-timer mode is selected #9
75) If the self-timer mode is selected, the timing for self-timer photography is set by clicking L-L, the light emitting element 14 blinks (#980), and the spindle motor 2
7 and prepares for recording to the floppy disk 26 (4985>, after 100 m5 has passed, the main mirror 3
, and remove the light shielding for the solid-state image sensor 9 (#
990). If the self-timer mode is not selected (if so, skip #980 to #985 above to raise the main mirror 3 and start the solid-state image sensor 9 and video processing control circuit 25 (#995). Turning on the power of the video processing control circuit 25] - rising time (approximately), OO
m s ) after counting 1-7 (#1000) - the "release" subroutine of #2000, which will be described later, is executed and the solid-state imaging probe 9 is exposed (#1005). next,
After the solid-state image sensor 9 has been exposed, the floppy disk 26
Please record the image taken to # ], 01. O)
, the driving of the color temperature sensor circuit 20, the video processing control circuit 25, and the solid-state imaging probe 9 is stopped (#1-01.5).
, lower the main mirror 3 (# ],, 020 )
, execute the subroutine (designate the next track based on map information), O2
5) Return to #15 of the main routine. As explained above, in this embodiment, in the subroutine sequence of "Sl", in order to accurately measure the brightness of the main subject and the brightness of the sub-subject, AP is executed first,
After accurately focusing on the subject, photometry (A, E) calculations are executed. By doing this, in the "photometering" subroutine sequence described later based on accurate photometry data,
It is possible to classify appropriate photometry modes and calculate accurate flash firing timing. Also, in self-timer mode, to avoid unnecessary current consumption,
The spindle motor 27 is not activated until a predetermined period of time has elapsed. In addition, when using fluorescent light or tungsten light as the light source, the color temperature setting is fixed to sunlight (flash light source), so the flash is automatically emitted to take a picture, and the flash prohibition switch S14 is set. [When flash prohibition mode J is selected, the color temperature is automatically adjusted to the color temperature of fluorescent light or tungsten light (AVtM
3) I try to do this. Next, r of well 1200 (#835 above) that executes 8P.
The subroutine of A l"J will be explained using No. 7171. First, turn on the power to the focus detection sensor 7 (CCD line sensor #1205), and then drain the unnecessary charge accumulated in the focus detection sensor. , set it to the initial state (
#], 2], O), start charge accumulation in the focus detection sensor (#1.2], 5). after that,
Please wait until the inclub 1~signal lNTl, which indicates the end time of charge accumulation in the focus detection sensor, is input.$12
20>, when the included signal 1-'N T 1 is detected (#1225), the accumulated charge of the focus detection sensor 7 is transferred to the analog shift register, and the accumulated charge is output from the shift I register one pixel at a time, A, /D conversion and sequential input to system controller I-roller 10 (#
1230). Next, detect the defocus tD from the data captured by the system controller 10 (#1235), and judge the reliability of the defocus measurement #]240),
If it is unreliable due to low contrast l-last, execute the subroutine for "low contrast 1~last 1~" processing #], 325), and display the out-of-focus state (#1.33).
0), return to the main routine (#1B20). If the low contrast 1 helast is not unreliable, check that the subject is accurately focused #]245
>, when in focus, find the information on the current stop position of the photographic lens 1 from the information on the previous stop position and the current movement amount, and then calculate the focal length f at that time based on this information. The photographing position ratio is determined using a conversion coefficient corresponding to
). Then, the focus LED display 19a in the finder (
(green) 1j (#1, 310), clutch circuit 1
3 is turned off, the connection to the motor M is switched from the photographing lens 1 to the main mirror 3 (#1315), and the process returns to the main routine (#1320). Furthermore, if the image is not in focus in #1245, it will be focused in the following steps. First, the lens extension amount conversion coefficient K is read from the ROM in the system controller 1-roller 10 based on the current focal length f from the zoom encoder switch S12 (#1.2
50) Multiply the defocus scale by the conversion coefficient K to obtain 5 photointervals corresponding to the amount of rotation of the motor required to reach the in-focus point. ) Pano

[Number of spaces N (=
1g×1)) Find (#i','), 55
) , , then the calculated number of pulses N is the motor l','
jj, in i? Connect the clutch circuit 13 to the system controller 1 (#1260) in the system controller 1 (#1260), which controls the amount of Switch to main mirror 3 or 4., li1 shadow 1.ance 1 (#)
, 265>, Photographing lens 1ζ2) Start driving (#1
270>. Next, cover 1 r: - (make the interrupt possible (#) 2 '7 ''-r, wait until the counter value -0 and a counter interrupt occurs)
280) 2 Cow]・7 including 1 or in a low state (#
],, 285 > , Stop driving the photographing lens 1 and focus (#1.290). Then, in order to confirm the in-focus state, charge accumulation in the focus detection sensor 7 is started again.#12≦)c))
The camera waits until T1 is input manually (#300.), and then returns to #1.225 to perform focus confirmation processing. If the focus is incomplete during the focus H confirmation process, try #]245 again.
Go to #]250 and focus until #1250~#
1. Repeat routine 300. Next, the "photometering" subroutine of #1500 (#880 above) will be explained using FIG. 8(a). In addition, in the same figure, the units used for calculation are A, P E
It is the X value. First, the correction calculation of the ISO sensitivity is performed, that is, the corrected ISO sensitivity 5v (-3v O+ 7 ) is calculated from the standard ISOSO3MO of the solid-state image sensor 9 and the imaging sensitivity σ) variation correction amount γ.
#1503), then the photometric sensors 17a, 1
7b, the brightness at the center of the shooting screen Bvl (spot I ~ photometric value) and the brightness around the shooting screen 13v2 (
photometry (average photometry value) is started (#1505). next,
The double integration circuit 22g starts converting the analog signal of the brightness measured by the photometric sensors 17a and 17b into a digital signal (81.510), and then checks whether the A/D conversion of the measured brightness is completed. #151.5>
If the process is not completed, the process waits until the process is completed, and when the process is completed, the photometric data converted into digital signals is input to the system controller I to the roller 10 (#1520). Next, check whether the AP-AE lock is completed (#
1525). If AP-AE is not locked, #
Execute 1.530 to #1.545 and set the peripheral brightness Bv
2 and the center brightness Bv1, the brightness difference ΔBv and the main subject brightness Bv
Find s. In other words, check whether Bvl exceeds 11 (#1530), and if it exceeds 11, the central brightness is too high, so fix it at Bvl-11 (#1535), 11
If it is below, using the same Bvl, the peripheral brightness B
Brightness difference Δr3v between v2 and center brightness Bv1=Bv2−BV
#1540), then subtract the correction amount α shown in Table 1 from the center brightness BV1 to obtain the main subject brightness Bvs
(=Bv1-α) is calculated (#154, 5). A,
When F-AE is locked, the above luminance difference ΔBv
and the main subject brightness Bvs have already been found, so #1
530 ~ # 1.545 is skiraged and #155 described later
Go to 0. Note that when AF-AE first enters the photometric (A, E) calculation subroutine after switch S1 is closed (#55) in the main routine (#880 of subroutine "Sl" II 5008, ), 17 ivy is right at the foot of the tl1525#↑5
Proceed to 130, subroutine rSIJ(7) [1040
It is locked only when the car returns to #865 and the car #88o enters #1525. Next, check whether the peripheral brightness Bv2 exceeds 10.#
1550), Bv2 exceeds 10 (If the ambient brightness is too high, please fix it to Bv2-10)
5), ], If it is 7L or less, use Bv2 as it is to set the sub-subject brightness to B~.8 (Sho 1, 560 >.Next, the center brightness BV1 is the photometry limit value of HH1 light sensor 7a Please check if it is at a low temperature #1565
), if the luminance is low to the photometry limit value, calculate the ``1-no-uniform luminance B VS' of the entire photographic screen for low luminance processing using the following formula.#1.595), and proceed to #1600. In other words, Bvs 7-BvA Bvs' = -(at low brightness) (obtain the reference value δ for backlight judgment using Table 2 and Bvs (#) 570), then sub-subject brightness E (vA and main subject Brightness difference ΔBv' (=)3v8-B of brightness Bvs
vs) and the judgment reference value δ obtained in #1.570 (#1575). Here, if ΔBv'>δ, it is determined that it is backlighting and the "backlight" flag is set.
80), the average brightness of the backlight process Bv F, ′ is B
Set vs (#], 590), #i,
The process proceeds to 600, and if ΔB v '≦δ, it is determined to be "frontlight", and the average brightness Bvs' for frontlight processing is calculated using the following formula (#], 585), and the process proceeds to #1600. Bvs 3 ・Bv8 to vs' = + then # ],
600 to #1.615 are used to classify the shooting mode. First, check whether the [Backlight] flag is set to 1 or more (#1.600), and if the flag is not set to 1 or more (in the case of "Front light mode"), check if the flag is set to 1 or more.
The average brightness of the entire shooting screen determined by 1.595 is 13 V
s' and the camera shake limit brightness Bvll, and separate the modes into "flash mode" and "natural light mode j"(#
1605), if Bvs'≧BvH, then it is determined whether the flash necessity flag is set (#1606). Here, if the flag is set, the illumination light source is not sunlight but artificial light such as a fluorescent lamp or tungsten light, and in #875 of FIG.
This indicates that the flash mode has been flashed in the dark, and the process advances to routine 2 of the "dark flash mode." On the other hand, if the flag is not set to 1~, #1620 of the "natural light mode" routine ■
Proceed to. If Bvs'<Bvll, the process advances to #], 675 of the "dark flash mode" routine (■). [If the flag for backlight j is set to Sen 1~ (in the case of backlight J), compare the brightness (BvA-δ) obtained by subtracting the backlight judgment reference value δ from the sub-subject brightness BV^ and the camera shake limit brightness Bvll. #1610), if (BvA-δ)≧BvH, set the “intermediate” flag indicating backlight on a bright background (#1.61.5>, and execute the “backlight flash mode” routine. Go to #1.800 of ■.(B
v8) < B v l-1, which means backlighting in a dark background, so proceed to [# of routine ■ of dark flash mode J] 675. Next, the "natural light mode" will be explained. First, it is checked whether the [-forced light emission] flag is set (#1620). If the flag is not set, then check whether the "road" flag is set (#1.625), and if the "road" flag is also not set, the control Bv value Bv[ Set the average brightness Bvs'(#1.630), and set the correction amount ΔE v 11 to 0 when directly metering the main subject brightness (#1.635). #1625 [If the road 1 flag is set to Sen 1, the background is brightly backlit, so the control B v (i'fi B v T is the value obtained by correcting the main subject brightness Bvs by +0.5, Zunawa T-BvT
=Bvs+0.5 (#1640), set J2 correction amount ΔEv old to (0,5-α) (#]6'
15). Note that α is the supplementary IE amount shown in Table 1, and its value changes depending on the imaging magnification β. Next, control BV value BvT and minimum brightness Bv that can be photographed
If BvT≦F3 v L, the shooting screen is too dark, so please set the 1 shooting not allowed flag. 665), executes the "release lock" subroutine and prohibits shooting (#1.6
70). )3 If v I > B v l, set the flash unnecessary flag #1655) and return to the main routine (#1.795). Also, if the "forced flash" flag is set in #1620, the flash mode is active, so proceed to #1675 of the "dark flash mode J routine ■".Next, regarding the "dark flash mode" routine ■ explain. First, check whether the "light emission prohibition" flag is set to Cera 1~.
Since this is a natural light photo shoot, proceed to #i 625 of "Natural Light Mode 1 Routine ■."
When the image is sorted, the main subject brightness Bvs is set to ii, o.
Corrected brightness (Bvs()) and camera shake limit brightness Bv
Compare H #1.680>, and change the setting of the control Bv value depending on the brightness of the main subject. Tsunawachi Bv
If s -1-1≧B v H, control E (v value Hv
Add 1-subject brightness Bvs to T + 10 sleeve closures (
Please set Bvs-1-1) #1685),
Hv s +-] < B v tl is lower than the main subject brightness or camera shake limit brightness, so the control Bv value B
V[ is fixed at camera shake limit brightness [:1 v II (#
], 690>. Next, the amount of correction of the exposure amount due to flash emission ΔE V
Let the coefficient K added to Fl- be 0 # 1.69
5) Classify the value of photographing magnification β into three types (#j700
), set the exposure amount correction amount ΔEvFL by flash emission for that note (#1705 to #17
15), that is, β><1/25), the correction amount Δto]■[should be set to 0 #1705), (1/25
＞≧β＞(]155) That is complementary-IU rat △E v
Please set F to (0,5-]<,, >#1-
71. O), (1, / 55) ≧ β, then E■[l- is (1,
0-K) (#1715). This is the imaging magnification β
This is a correction because the size of the main subject on the photographic screen changes and the amount of exposure due to flash emission also changes. Next, the maximum light emission amount of the flash is 1v, and the correction amount △
Flash light emission amount Iv (= ■v
->-ΔEvFl-), and further calculates the aperture value A v D from the above Iv', film sensitivity Sv, and subject distance information Dv using the following formula (#1720). That is, AvD =Tv'-1-3v-1)vl,v
-t 5v-Dv + Δ EvF then #]
Compare the aperture value AvD obtained in 720 with the aperture value Avoz corresponding to the focal length at that time, and determine whether the distance to the subject exceeds the limit that the flash light can reach (#1725
). If AvD'>Av02, the distance to the subject is beyond the limit of flash light reach.
Executes six warnings (#1730), further sets the "far limit" flag (#], 735), and sets the aperture value A v
Set D to Avoz (#1740). AvD≦Av
oz, don't do anything with that, just set the aperture value AvD.
is set to Avoz (#1740). Next, the brightness B v H (='Fv H-1-A
v DSv) and the control Bv value Bv'r set in 81.685 or #1690 #1.74
5>, if BvT≦BvH, leave it as is #1.76
Proceed to step 5 and calculate the control IJv (flash emission timing time using direct BvT) ゛■.BvT>
If BvH is set, check if the "Midway" flag is set to Sera 1-, 750), and if the flag is set to Sera I, proceed to #1.765 and set the flag or Sera 1-
If so, set the control Bv value ByT to (Tv)4→-Av
D-3v) (#1.755), the control 13 ■ value obtained with the main wave'q body brightness B v s and #1.755! 3 v T (= 'f' v M tA v D
-3v >-#1-760), Bvs≦B
If it is vT, the process proceeds to #1765, and the flash light emission timing time '[V is calculated using the control Bv value BvT set in #1755. Also, if Bvs>BvT, [# of (:1 natural light mode] routine ■),, 6
Proceed to 20. Incidentally, in #1765, the flash emission timing time T'v is calculated from the following equation. Ev=)3vT+Sv Tv-Ev-AvDBvT-1-Sv-AvDThen, #],
, 765, the flash timing time T”
Compare v with maximum shutter speed TvM or camera shake limit shutter speed "I' v H#] 770
．． #], 780), if T"v≧'I"vH, it is the time when flash emission cannot be controlled, so set the timing time Tv to the maximum shutter speed i"vH (#1775), and ≦"v II, there is a risk of camera shake before the flash fires, so set the timing time Tv to the camera shake limit shutter speed 'T' v If (#: +-785),"
Set the “Flash Required” flag to Cera I-L (#1790)
, returns to the main routine (#1795). "F
v fl < T” v < T v H (#
1770, #1780), #1.765 T
Using v, proceed from #1790 to #]795'\. Next, the routine (2) of the [backlight flash mode] will be explained. First, check whether the flag "1 flash prohibited" is set to 1- (#1800), and if the flag is set, "
Proceed to #1625 of Routine ■ of ``Natural Light Mode''. 1
If the "Flash Prohibition" flag is not set, the control Bv value B■[is changed from the sub-subject brightness Bv8 to the correction amount 1. ○E
Set the value subtracted by v, that is, BvT = Bv8-10 (#1805), and calculate the brightness difference from the control Bv value Bv'I and the main subject brightness BvS, Zunawaji, and the brightness from the appropriateness of the natural light component. Difference ΔE v N (−B v s
-B v T) #1.8 ], O)
, J2 luminance difference ΔEvN and -10EV are compared (#
], 8] 5), ΔEvN>-], , If O, then ΔE
Fix vN to -1, o, set the control FJ v value BvT to the main subject brightness Bvs plus correction amount 1, oEv, that is, BvT -Bvs-11-,O, and set ΔEv
If N≦-1,0, #1805 and #1.81.0
B v T = F3 vs −+−1, set by
0 and ΔEvN = Bvs-BvT. Then, the amount of compensation for the amount of fog light due to flash emission EvF
[Set the coefficient K added to - to the value of α #1825
), proceed to J-Note #1-700 and perform the processing from #1700 described in [Dark flash mode]. By the way, [in backlight flash mode J, the predetermined timing time for flash emission is determined from the brightness of the sub-subject 'Fv
(however, when δ≦Bv≦2, calculate the flash emission timing from the main subject brightness), and after the start of exposure, the flash is emitted after the predetermined time T v has elapsed to ensure that the main subject is properly exposed. The balance between the brightness of the main subject and the background sub-subject is adjusted by stopping the exposure when the exposure becomes appropriate. Since the main subject is stopped, the main subject will be properly photographed, or the sub-subject will be overexposed by the amount of time the flash fires. Therefore, in addition to the above-mentioned embodiment, a second embodiment will be described below, which can accurately adjust the balance of brightness between the main subject and the sub-subject. In other words, a fixed correction time X [seconds] is calculated from the brightness difference between the main subject and the sub-subject, and the flash is emitted X [seconds] before the predetermined time 'r''V elapses. 2. The value obtained by converting the specified time 1゛■ into [seconds]
″, if the timing time of the flash emission corrected by the fixed time X from the same x ″ is x′ [seconds], then TV X' expressed as 2-x [: seconds] is the timing time of flash emission. FIG. 8(b) shows the second embodiment using the predetermined time
) will be explained using flowchart 1~. In addition, the flowchart l~ in FIG. 8(b) is as shown in FIG. 8<a).
It is inserted between #1765 and #], ]770. After the flash emission timing time 1゛v is calculated in #1765, check whether the "interval" flag is set (#1895); if it is not set, proceed directly to #1.770. If the flag is set, the correction amount ΔEvF from the appropriate amount of flash light is calculated from the brightness difference ΔEvN from the appropriate amount of natural light using the following equation (#1900). ΔE v N > ΔEvF = log2 (]-2 Next, the required amount of flash light Iv from the main subject distance
Calculate s from the following formula (#], , ]905). I vs=Avoz+Dv-8v Next, the flash light emission amount Ivs determined in #1.905
Compare the actual luminescence amount Iv with #19] 0>Ivs≦I
If it is v, calculate the correction amount ΔEvF' obtained from the distance information obtained from the main wave object distance ^ 13 and the correction amount ΔEvF from the appropriate amount of flash light amount using the following formula # 1.9
1.5), the correction amount ΔEv from the table shown in Table 4.
Determine the correction time X corresponding to F'(#1940
). ΔEvF ′-1vs-1v±ΔEvF Also, I v
If s > I v, the light emission amount Ivs is corrected by adding the brightness difference correction amount ΔEvF to the flash light emission amount 1 vs
'<:IVS+ΔEvF) #1920)
, the above correction amount ΔEvF' is calculated from the difference between this light emission amount T vs' and the actual light emission amount 1v (#], ]9
25). That is, ΔEvF'=Ivs'-1v Next, check whether the above correction amount ΔEvF' is less than ○Ev (#1930), and if ΔEvF'>O, ΔEv
F' should be set to O41935), ΔEvF'≦0
If so, use the same ΔEvF', #19/]
Proceed to O and calculate the correction amount ΔEvF from the table shown in Table 3.
′ is determined. Next, # 1.940 is calculated as
From v, the timing time x' for flash emission is determined by the following formula:
Calculate [seconds] (#1945). Tv X′=2−x Next, convert the flash emission timing time
1.950>. Tv=log,,<1. /X') This concludes the explanation of the second embodiment, and next the subroutine of "release j" in #2000 (#1005 in FIG. 6) will be explained using FIG. 9. It consists of routines for "natural light mode J,""flashmode," and "forced light emission mode." First, switch the switch SWI to designate the photometry sensor as the light receiving section 17a (spot photometry at the center of the shooting screen) (#
2005). This is to control the exposure of the solid-state image sensor 9 to be stopped when the main subject becomes appropriate, so that the sensor that performs photometry is set to spot photometry at the center of the photographic screen. Next, use #20]0 and #201.5 to divide the shooting mode into "natural light mode 1,""flashmode," and "forced flash mode." If the "forced flash" flag is set in #2010, #2235 to #2275
Proceed to the “1 forced flash mode” routine (described later), #20
If the "Flash Required" flag is set in step 15, the process advances to the "Flash Mode" routine in #2090 to #2230 (described later); if the "Flash Required" flag is not set to Sera 1 to #2085, the process proceeds to #2020 to #2085. Proceed to the “Natural Light Mode” routine. When shooting in natural light mode (#2020), the ISO feeling is corrected by the main subject brightness correction value ΔEvil and the imaging sensitivity variation correction value γ (#2025). Next, timer T1 and timer 1-2 are set to VH, the two-way division value of maximum shutter speed tM (-2)
At the same time, the camera shake limit shutter speed th'T' v H <-2) is started, and the exposure of the solid-state image sensor 9 is also started (
#2030). Next, time t. As time elapses, it is confirmed whether the exposure amount of the solid-state image sensor 9 has reached an appropriate level. In other words, check timer T1-0.#
2035), T1. >0 means that the voltage (l'riV (hereinafter referred to as exposure voltage value)) of the content C of the circuit 22i that detects that the amount of charge accumulation in the solid-state image sensor 9 has become appropriate is compared with the reference voltage value Vo. #2040), Vo
<V" (If it is -, the charge accumulation amount has not reached the appropriate value, so return to #2035, check timer T1 again, and set Vo
If ≧V, the amount of charge accumulation has reached an appropriate value, but the charge accumulation is being performed excessively at time t), so a flag is set to correct the gain of the captured image by -1 or 0. (#20/1.5), proceed to #2280~#2290,
The shutter is closed, the gain supplement Jf value -10 is output to the video processing control circuit 25, and the process returns to the main routine. If #2035 is T】-0, timer 1 is set to t again.
A countdown is started by setting 0 to 0, and it is confirmed that the exposure amount of the solid-state image sensor 9 reaches an appropriate level by the time t elapses (#2250 to #2060). time t
If the solid-state image sensor 9 reaches proper exposure by the time tH elapses, excessive charge accumulation is performed until time tH, and a flag is set to correct the gain of the captured image by -0.5.し”i((#
2045), proceed to #2280 to #2290, close the shutter, and send the gain correction value -0.5 to the video processing control circuit 25.
and return to the main routine. time to
If the solid-state image sensor 9 does not reach the proper exposure by the time tH elapses (T'1=0 in #2055), then the time tH~t1
Check whether the solid-state image sensor 9 reaches the appropriate exposure during 1 (#2070, #2075>, that is, if VO≧■ (12,070 m) The solid-state image sensor 9 has reached the appropriate exposure, so close the shutter ( #2280), and since there is no gain correction, a gain correction value of 0 is output to the video processing control circuit 25 (#2285>), and the process returns to the main routine (#2280).
2290>. If Vo<■, T2=0 (time tl+
#2075) If T2 = 0, the exposure time of the solid-state imaging element 9 exceeds the camera shake limit time, so forcefully stop the charge accumulation of the solid-state imaging element 9. 2080), set a flag to correct the gain of the slanted image by +0.5 to correct the underexposure.
2085), closes the shutter (#2280), and outputs the gain correction value +0.5 to the video processing control circuit 25 (#2
285), return to main routine (#2290
). Next, to explain the flash mode (#2090), as in the natural light mode, first, the main subject brightness correction value E v FL and the imaging sensitivity variation correction value? − Is○sensitivity Sv corrected by D/A conversion circuit 22
Output to h (#2095). Next, check if the "backlight" flag is set (#21.00), and if the flag is set, #2
Proceed to "Backlight" flash mode shooting (described later) from 155 to #2230, and if Sera 1 to #2230 have not been set, proceed to #21
．． Perform normal flash mode photography from 05 to #2150. In normal flash mode shooting, timers T1 and T2 are programmed with flash emission timing time tA (2) and camera shake limit shutter speed t11, respectively, and at the same time as timers TI and T2 start counting, solid-state imaging is performed. Exposure of element 9 is also started (#2105). next,
Exposure with natural light is performed until T1 = 0 (time forward), and when T''1 = O, a flash is emitted (#211.0 to #21.1.5),
At the same time, set timer T3 to the time when the flash is emitting light, and start the flash 1~down (#2
1.20). Compare the reference voltage value ■0 and the exposure voltage value V during flash emission (T3>Oh), and if ■0≧■, (#
2125 to #21.30), after the solid-state image sensor 9 reaches proper exposure, the process proceeds to #2280 to #2290,
The shutter is closed and there is no gain correction, so the gain correction value is 0.
is output to the video processing control circuit 25, and the process returns to the main routine. Next, if proper exposure is achieved with V o < V during flash emission, the solid-state image sensor 9 will be activated by the time the camera shake limit time t ]1 has elapsed (T2=0) after the flash emission (after time tF has elapsed). Check whether proper exposure is reached (#213
5~-#214.0). If the proper exposure is not achieved, please refer to (#
2]40), #2280 to #229 similar to #2]30
0, the shutter is closed, and since there is no gain correction, the gain correction value O is output to the video processing control circuit 25, and the process returns to the main routine. If proper exposure is not reached by the time the camera shake limit time tH elapses ('v20), charge accumulation in the solid-state image sensor 9 will be forcibly stopped when the time t11 has elapsed (#2145), and the underexposure will be corrected. To make the correction, set a flag to correct the gain of the photographed image by +0.5 (#2150), proceed to #2280 to #2290, close the shutter, and set the gain correction value by 0.5 to the image processing control circuit 25. and return to the main routine. Next, in #2100, check that the backlight j flag is set to 1~, and when shooting in the flash mode of ``backlight'', check that the ``remote'' flag is also set.
5) If the flag is not set, the timer'
Set the flash firing timing time ta to F (#2160), and if the flag is set, set the flash firing timing time 7 to timer 1''(#2160).
Set - to 8/2) (#2195) and count l~
At the same time, exposure of the solid-state image sensor 9 is also started. "If the remote J flash has not been set to Sen 1~, when the flash emission timing time has elapsed (#2),
65), fire the flash (#21, 70),
At the same time, set timer 1 for the flash emission time and
・Open C, Count l to Town (#2175>. Then, while the flash is firing ('T'>0), if the solid-state image sensor 9 is set to proper exposure (#21.80.#21.
90>, the process proceeds to #2280 to #2290, the shutter is closed, and since there is no gain correction, the gain correction value O is output to the video processing control circuit 25, and the process returns to the main routine. If proper exposure is not obtained during flash emission, charge accumulation in the solid-state image sensor 9 will be forcibly stopped after the flash is emitted (after time t has passed), and the gain correction of the captured image will be The shutter is closed (-92280) without setting the flag, and since there is no gain correction, a gain correction value of 0 is output to the video processing control circuit 25 (#22
85), return to main routine (#2290)
. #21.8 Because the background is brightly backlit when shooting in [Backlight Flash Mode] from 821.60 to #2185.
Even if the exposure is forcibly stopped in step 5, the gain correction of the captured image will not be performed. ``Even if the remote J flash is set to 1~, the flash is emitted after the flash emission timing time tA' has elapsed, as in the above-mentioned case where the remote J flash is not set to 1~ When the image sensor 9 is exposed properly, the shutter is closed, and since there is no gain compensation, a gain compensation value of 0 is output to the video processing control circuit 25, and the process returns to the main routine (2200 to #2220.
#2280-#2290). If proper exposure is not obtained during flash firing, the charge accumulation in the solid-state image sensor 9 is forcibly stopped after flash firing #2], 45), and the gain of the photographed image is corrected by +-1 or 0. Sent the flag 1
~ (#2230) and close the shutter (#2280)
, outputs the gain correction value +10 to the video processing control circuit 11825 (#:2285), and returns to the main routine <#2290>. #2 ],, When shooting in the "remote""backlight flash mode" of 95 to #2230, the exposure time using natural light is half of the time when shooting in the "backlight flash mode", so the exposure time in #2225 When it is forcibly stopped, the gain correction of the captured video is +1°0. Next, to explain the forced flash mode (#2235), first, the correction of main subject brightness, the value ΔEv[1-, and the 130 sensitivity S corrected by the imaging sensitivity variation correction value γ.
v and 1)/A conversion circuit 221] (#2
240). Next, set the maximum shank speed tM and camera shake limit shutter speed t+1 to timer 1 and timer T2, respectively, and set timers T''] and T''2.
The solid-state image sensor 9 is activated at the same time as starting the call 1~town.
Exposure is also started (#2245). Next, when the maximum shutter speed l has elapsed (T1.=O), the flash is emitted (#2250 to #2255), and the solid-state image sensor 9 is Check whether proper exposure is reached (#2260 to #22
65). 1F until camera shake limit time tH elapses
If the exposure is not achieved, close the shutter (#2280),
Since there is no gain correction, a gain correction value of 0 is output to the video processing control circuit 25 (#2285), and the process returns to the main routine (#2290). If the appropriate exposure is not reached, the camera shake limit time t h has not elapsed (when T2=O), the charge accumulation in the solid-state image sensor 9 is forcibly stopped (#2270), and the insufficient exposure is corrected. To do this, set a flag to correct the gayness of the shot video by 0.5 (#2275), close the shutter (#2280), and output the gain correction values -+-0, 5 to the video processing control circuit 25. (#2285) and return to the main routine (#2285).
2290). This concludes the explanation of the release sequence operation. In this embodiment, in order to downsize and reduce the cost of the device, the flash light emitting control circuit is omitted so that the flash always emits all light. However, in order to save power, the flash may also stop emitting light when the exposure is stopped. (The following is a blank space) Table 4.17 Simple explanation of I song Figure 1 is a diagram showing the configuration of the optical system of an electronic camera according to an embodiment of the present invention, and Figure 2 is the system configuration of the electronic camera described in 1-7. Figure 1.3 is a diagonal time chart explaining the exposure time and flash firing timing time. ′
1F-Note '5I'-Chart of the main 7°lL7 which controls the camera part of the camera, Figure 5 shows the initial load applied to the camera. Flowcharts 1 to 6 of '3', 'r are applied to the above main 111gram.
Figures 1 to 7 are flow charts 1 to 1 for executing AF applied to -70-Char 1- in S1 above, and Figures 8 (a, ) are flowcharts 1 to 8 (a, The flowchart l~, FIG. 8(l')) for executing the applied photometric AE calculation is a flowchart for explaining the second embodiment of the timing time of -7 U/NOSH according to the present invention. , FIG. 9 is a flowchart for executing the release applied to flowchart 1 to S1 above. 6... Photometric sensor, 9... Solid-state image sensor, 10...
・System controller, 18... flash circuit,
22... Control IC123... System controller, 25... Video processing control circuit. Applicant Minolta Camera Co., Ltd. Agent
Patent Attorney Yasushi Itaya Fire Brother

Claims (1)

[Claims] (1) A photometer that measures the brightness of the main subject and the sub-subject, a flash control unit that determines the timing of flash emission based on the photometry information, and an electronic shutter that controls the exposure time of an image sensor that has a shutter function. a control means; a video processing control circuit that processes the accumulated charge of the image sensor as a video signal for recording on a recording medium; a gain control circuit that outputs a gain adjustment signal to the video processing control circuit; , a judgment means for determining whether the main subject is beyond the reachable limit of the flash light, and when it is determined that the main subject is beyond the reachable limit of the flash light when the subject is backlit, the image sensor is activated by natural light. It is characterized in that the exposure is controlled to be under the proper exposure by a predetermined amount, then a flash is emitted, and after the exposure is completed, the gain is increased by the predetermined amount by the gain control circuit and the image is recorded. Electronic camera exposure control device.