JP3956220B2 - camera - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a camera focus and strobe control device that can always perform daytime synchronized photographing with a strobe light emitter with appropriate exposure.
[0002]
[Prior art]
Some cameras that allow daytime synchro photography with a strobe light emitter have been devised to obtain an appropriate exposure amount. For example, in advance, the delay time and the time from when the shutter starts to open until the inversion signal appears are stored in the ROM as data, and this is compared with the calculated exposure time. Some have aimed to obtain an appropriate exposure amount by triggering a strobe (see, for example, Patent Document 1). In addition, there is also one that performs flashmatic calculation and displays whether or not it is within the aperture interlocking range from the calculation result (for example, see Patent Document 2).
[0003]
[Patent Document 1]
JP-A-60-184234
[Patent Document 2]
JP 63-106733 A
[0004]
[Problems to be solved by the invention]
The guide number (hereinafter referred to as “the flash emission time of the lens shutter camera) is controlled so as to obtain an appropriate exposure from the F value, film sensitivity and distance measurement data obtained based on the subject luminance metering data. The control ("GNO") is well known. According to GNO control, instead of using the full energy stored in the main capacitor of the strobe to emit full light, the light is cut off during the light emission time, so the camera battery can be used efficiently. This has the advantage that the time required for charging the main capacitor for the next strobe emission is shortened and the strobe shooting interval is shortened.
[0005]
However, if the subject is low in brightness and the flash fires automatically, the shutter opens to the release value, so there is no problem if the flash is fired and GNO control is performed in synchronism with this. When the shutter speed is relatively high and the shutter is not fully opened as in the case of GNO control, the conventional GNO control calculation uses the F value at the peak of the shutter operation waveform at that time. However, the exposure amount is insufficient by the amount that is less than the release F value. Here, it is conceivable to detect the F value at the peak of the shutter operation waveform and perform GNO control based on this F value. However, in a general lens shutter type camera, unlike a single lens reflex camera having a focal plane shutter. The F value is determined by the shutter speed, and the F value cannot be obtained in the same manner as a single-lens reflex camera. For this reason, even if daytime synchronized shooting is performed by GNO control with a conventional lens shutter camera, shooting with appropriate exposure cannot be performed.
[0006]
Therefore, the present invention creates an F value table that is paired with the shutter speed according to the subject brightness, detects the F value corresponding to the shutter time from this table, and performs the GNO control calculation based on the detected F value. Accordingly, an object of the present invention is to provide a camera shutter and strobe control device that enables photographing with appropriate exposure even when GNO control is performed by daytime synchronization in a lens shutter camera.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a camera having a lens shutter, the shutter time setting unit for setting the shutter time based on the photometric data, and the time from the shutter time set by the shutter time setting unit. F value selection unit that calculates the F value of F and the F value obtained by the F value selection unit And based on film sensitivity and ranging data When the F number calculated by the guide number calculation unit for calculating the strobe guide number and the F value selection unit is within the range from the open value to the first value Fix the strobe guide number to the maximum value. Flash strobe with flashmatic control Light system The above F value is the above A value greater than the first value And If The F value is fixed to the first value and one stage Flashmatic control And guide number control Combined with strobe Light system Above When the control by the guide number becomes the minimum value of the flash guide number, the flash guide number is fixed to the minimum value. Controlled strobe Light system And a strobe light emission control unit to be controlled.
[0008]
According to a second aspect of the present invention, there is provided a camera having a lens shutter, the shutter time setting unit for setting the shutter time based on the photometric data, and the shutter time set by the shutter time setting unit. F value selection unit for calculating the F value of the shutter and the shutter speed set by the shutter time setting unit F value corresponding to Is in a range smaller than the predetermined value The strobe guide number is fixed to the maximum and flash emission control is performed by flashmatic control. If the F value is larger than the predetermined value, the F value is fixed to the predetermined value, and one-step flashmatic control and guide are performed. The flash control is combined with the number control, and if the control by the guide number reaches the minimum value of the strobe guide number, the strobe guide number is fixed to the minimum value and the flash emission control is performed by flashmatic control. And a strobe light emission control unit to be controlled.
[0009]
[Action]
According to the first aspect of the present invention, the shutter time setting unit sets the shutter time based on the photometric data, and the F value selection unit obtains the F value at that time from the set shutter time from the ROM table. If this F value is within the range from the open value to the first value, Fix the strobe guide number to the maximum value. Flash strobe with flashmatic control Light system I will do it. The F value is the above A value greater than the first value And If The F value is fixed to the first value and one stage Flashmatic control And guide number control Combined with strobe Light system I will do it. the above When the control by the guide number becomes the minimum value of the flash guide number, the flash guide number is fixed to the minimum value. Controlled strobe Light system I will do it. As a result, daytime synchronized photographing by GNO control is performed with an appropriate exposure amount.
[0010]
In the invention according to claim 2, the shutter speed set by the shutter speed setting section F value corresponding to Is in a range smaller than the predetermined value The strobe guide number is fixed to the maximum and the flash emission is controlled by flashmatic control. When the F value is larger than the predetermined value, the F value is fixed to the predetermined value, and the flash emission control is performed by combining one-step flashmatic control and guide number control. I will do it. When the control with the guide number is the minimum value of the strobe guide number, the strobe guide number is fixed to the minimum value and the flash emission control is performed by flashmatic control. I will do it.
[0011]
【Example】
Embodiments of a camera shutter and strobe control device according to the present invention will be described below with reference to the drawings. FIG. 1 shows an electrical block of a circuit used in an embodiment of the present invention, which is mainly composed of a CPU 1 and an interface (hereinafter referred to as “IF”) IC 20. A constant voltage power is supplied from the battery 2 to the CPU 1 via the DC-DC converter 3. The CPU 1 includes a reset IC 4, a remote control IC 5, an AEIC 6 for inputting photometric data, an AFIC 7 for inputting distance measurement data, a date imprinting LED 8, a clock oscillator 9, a strobe light emitter 11, an external liquid crystal display element (hereinafter referred to as “liquid crystal display element”). 12), an operation switch 13 linked to the release button, a driver 15 of the finder display LCD 14, an EEPROM 16 for storing various adjustment values, and a personal computer 10 used for adjustment and inspection.
[0012]
The IFIC 20 controls the constant voltage control transistor 24 to control its constant voltage output. The IFIC 20 displays a constant voltage driver 21 of a pulse motor 22 for driving a focusing lens and the like, a display LED 23, a driver 31 of a zoom motor 32 and a film feeding motor 33, a driver 34 of a shutter 35, a self-timer operation and other various displays. A driver 36 of the lamp 37 to be performed, a photo reflector (PR) and a photo interrupter (PI) 38 for detecting the operation of the shutter and other parts, and a DX switch 39 for detecting film sensitivity and other various data relating to the film from the contact point of the film cartridge are connected. ing.
[0013]
When reset by the reset IC 4, the CPU 1 activates the DC-DC converter 3 and supplies a constant voltage of, for example, 5 V to each IC. Each IC has a built-in power saving function that consumes less current except during operation. The IFIC 20 is controlled by serial communication data from the CPU 1. When the CPU 1 periodically detects the operation of the operation switch 13 and determines that the release button has been pressed, the CPU 1 captures the photometry data from the AEIC 6 and the distance measurement data from the AFIC 7 to check the charging voltage of the strobe light emitter 11. After predetermined display is performed by the external LCD 12, the finder LCD 14, and the display LED 23, the pulse motor 22 is driven and the focusing lens is extended to a predetermined position obtained from the distance measurement data, and then shutter opening / closing control is performed.
[0014]
In the shutter opening / closing control, the operation of the constant voltage control transistor 24 is controlled by the IFIC 20 based on the serial communication data from the CPU 1 to set the shutter driving voltage, and the shutter operation is controlled by detecting the reflected light from the shutter. This is done by processing a photoreflector (hereinafter “PR”) signal to be detected. When the subject brightness is low during shutter control, the strobe 11 emits light in accordance with the operation of the shutter. Strobe light emission is controlled by light emission timing, that is, the FM control that emits light at an appropriate aperture value while the shutter is open, the GNO control that controls the light emission time to achieve proper exposure, and the control that combines these FM and GNO controls. This ensures proper exposure. As described above, the IFIC 20 has a function as an FM control unit and a function as a GNO control unit. With these functions, the operation of the shutter 35 is controlled from the “MAG” terminal via the driver 34. Yes.
[0015]
In FIG. 1, a part of the IFIC 20, a portion including the constant voltage control transistor 24, the constant voltage driver 21, and the pulse motor 22 is a voltage setting for setting a focus drive voltage, a hold voltage at the focus hold, and a drive voltage at the shutter drive. Part 40 is configured. A specific example of the voltage setting unit 40 is shown in FIG. In FIG. 2, a pulse motor 22 drives a focus lens. The shutter is driven by an electromagnetic plunger or the like (not shown). The output of the constant voltage control transistor 24 is supplied to the pulse motor 22 through the constant voltage driver 21. The IFIC 20 controls the constant voltage control transistor 24 by outputting a control signal from the VCONT terminal so that the output voltage of the constant voltage control transistor 24 input to the VSENS terminal matches the set voltage of the CPU 1. The FPMV terminal of the IFIC 20 is a terminal that outputs an output voltage switching signal of the constant voltage driver 21. When the signal is “L”, the constant voltage driver 21 is functioned, and the reference voltage is divided by the ratio of the resistor R1 and the resistor R2. The pulse motor 22 is driven by voltage, and when it is “H”, the pulse motor 22 is driven by the constant voltage output of the constant voltage control transistor 24 without causing the constant voltage driver 21 to function. The FPM0 to FPM3 terminals of the IFIC 20 are pulse control output terminals for driving and controlling the pulse motor 22.
[0016]
Next, examples of various ROM tables used in the present invention will be described. FIG. 10 shows an example of the shutter speed / F value ROM table. When the shutter time ROM table is EV 3.5 to 17 (shutter time: about 1.4 seconds to 1/400 seconds), AESTEP is changed from 60 to 168, and ROMSTEP, that is, the ROM address is subtracted from AESTEP by 60. Corresponding to the values 0 to 108. Therefore, ROMSTEP is 0.125 EV step. The F value ROM table is a shutter time ROM table. When EV is 3.5 to 17, it corresponds to AV4 to 10 (F value: about 4 to 32), and FMSTEP at that time corresponds to 0 to 24. ing. Therefore, FMSTEP has 0.25 steps. As described above, the ROM table is prepared so that the shutter speed, the F value, and the FMSTEP can be obtained by associating AESTEP with the ROMSTEP in a certain relationship and selecting the ROMSTEP.
[0017]
FIG. 11A shows a combination example of the FMSTEP and GNOSTEP in the SYSTEM table, that is, the strobe light emission control. There are 0 to 38 in the SYSTEM, but the F value is from 0 to 4 in the SYSTEM. Open From 4.00 to 5.66, the GNO during this period is 16.00 full emission and only the flash FM control is performed. Also, FMSTEP during this period is 0 to 4. F value is from 5 to 28 Open GNO is 14.67 to 2.00 and GNOSTEP is changed from 1 to 24 during this time, and strobe GNO control is performed and FMSTEP is set to 4. Only one stage of strobe FM control is combined. In SYSTEM 29 to 38, the F value is from 6.17 to 13.45. During this time, GNO is fixed at 2.00, GNOSTEP is fixed at 24, FMSTEP is set from 5 to 14, and strobe GNO control and strobe FM control are set. Can be combined.
[0018]
FIG. 11B shows an example of the FMROM table. AV4 to 7.5 (F value: about 4 to 13) are represented by 0 to 14 in FMSTEP. FIG. 11C shows an example of the GNOROM table. GNO16 to 2 are represented by GNOSTEP0 to 24. The table shown in FIG. 10 and FIG. Open Aperture value, GNO. It depends on other various design conditions.
[0019]
Next, a specific example of the operation of the device of the present invention will be described. First, the focus hold operation during the shutter operation will be described with reference to the timing chart shown in FIG. In FIG. 12, PI is an operation signal of the shutter, the film feeding mechanism, and other components input to the IFIC 20 from the photo reflector (PR) and the photo interrupter (PI) 38 shown in FIG. MAG is a shutter release magnet drive signal, and SY is a strobe light emission signal. When the operation switch 13 shown in FIG. 1 is operated by depressing the release button, a number of pulse signals corresponding to the distance measurement data are output from the terminals FPM0 to FPM3 of the IFIC 20, and the pulse motor 22 is driven according to these pulse signals. Then, the focus lens is extended to focus on the subject. The pulse signals output from the terminals FPM0 to FPM3 are shifted in phase so that the pulse motor 22 rotates forward. During focus driving, the FPMV signal is “H”, and the constant voltage driver 21 drives the pulse motor 22 with the constant voltage of the constant voltage control transistor 24, that is, a relatively high voltage.
[0020]
After focusing by lens extension, the MAG signal is output and the shutter is opened and closed. The opening / closing operation of the shutter can be detected by inversion of the PI signal. After focusing by the lens extension, a constant voltage is applied to the pulse motor 22 to hold the focus position by the focus lens. At this time, the FPMV signal becomes “L” and the constant voltage driver 21 is turned on. The hold voltage lower than the drive voltage at the time of the focus drive is supplied to the pulse motor 22. The hold voltage may be set to the same voltage as the voltage at the time of driving the shutter.
[0021]
After the opening / closing operation of the shutter, a pulse signal is output from each of the terminals FPM0 to FPM3 of the IFIC 20, and the pulse motor 22 is driven to return the focus lens to the origin. At this time, the pulse signals output from the terminals FPM0 to FPM3 are shifted in phase so as to reverse the pulse motor 22. The origin of the focus lens is one end side of the entire movement stroke of the focus lens. Subsequently, a fixed number of pulse signals are output from the terminals FPM0 to FPM3, the pulse motor 22 is rotated forward, and the focus lens is extended to the reference position. Thus, by moving the focus lens to the origin and then extending it to the reference position, it is possible to eliminate a useless portion for moving the lens at the time of focusing and to shorten the time required for focusing. During the return driving to the origin of the focus lens and the extension driving to the reference position, the FPMV signal becomes “H” and the pulse motor 22 is driven with a relatively high voltage. Note that the detection of the focus lens reaching the origin or the reference position can be performed by outputting a PI signal.
[0022]
3 to 7 are release sequence flowcharts including the focus hold operation. In FIG. 3, when released, it is determined whether or not the strobe emission flag STBF is 1. In the case of 1, that is, in the case of strobe emission, it is determined whether or not the red-eye reduction flag AKAMEF is 1, and in the case of 1, that is, the red-eye reduction flag. If is standing, set and start the red-eye reduction timer to fire the red-eye reduction flash. When the STBF does not stand up and the AKAMEF does not stand up and after the strobe red-eye reduction light emission, the AF LED, that is, the distance measuring display LED, the STLED, that is, the strobe LED, the FLCD, that is, the finder distance measuring display LCD is turned off. Next, PDON_S, that is, focus drive voltage setting, LENF_S, that is, focus feed-out drive, and PMHOLD_S, that is, focus hold voltage setting during shutter drive (see FIG. 4) are sequentially performed.
[0023]
FIG. 5 shows a subroutine of the focus drive voltage setting PDON_S. In FIG. 5, the voltage setting unit 40 sets the focus driving voltage by setting the FPMV (see FIG. 2) of the IFIC 20 to 1, and the focus lens moves to the focus position and the focus photo interrupter (PI) is turned on. Drive to finish this routine. FIG. 6 shows a subroutine of focus hold voltage setting PMHOLD_S during the shutter driving. In FIG. 6, the hold voltage is set with FPMV set to zero. As described above, the focus hold voltage is set to a voltage lower than the focus drive voltage. The hold voltage may be set to the same voltage as the voltage at the time of driving the shutter. Thereafter, when a shutter drive voltage is set to drive the shutter, in FIG. 2, the hold voltage lower than the shutter voltage (focus voltage) is set in the pulse motor 22 via the constant voltage driver 21 in the shutter drive voltage. For example, if the focus drive voltage is 5 V and the shutter drive voltage is 2.5 V, and the design is such that the voltage can be driven, the constant voltage driver 21 is a driver having no constant voltage function, so that the hold voltage is 2. 5V, which is lower than the focus voltage and equal to the shutter drive voltage. The focus photo interrupter is turned off to detect the PR signal for detecting the shutter operation.
[0024]
Returning to FIG. 4, it is determined again whether or not the strobe emission flag STBF is 1. If it is 1, it is determined whether the red-eye reduction flag AKAMEF is 1. If it is 1, strobe charging is started and the strobe charging voltage ROK is started. Becomes more than the strobe full charge voltage FC, and the charging of the strobe is terminated after the end of the red-eye reduction time, and the shutter is driven. At this time, if the STBF is 1, the strobe light is also emitted. Subsequently, the focus drive voltage setting PDON_S is executed according to the subroutine of FIG. 5, the focus feed-out drive LENF_S is executed, and the focus drive off PDOFF_S is executed. The focus drive off PDOFF_S is executed according to a subroutine shown in FIG. That is, after the FPMV is set to 1, the focus drive is turned off, the focus drive power supply is turned off, and the focus photo interrupter is turned off, and this subroutine is finished. At the same time, the release sequence ends.
[0025]
As described above, since the power is supplied to the focus lens driving pulse motor and the focus is held during the shutter operation, the focus lens moves even if force is applied to the focus lens due to vibration or the like during the shutter operation. There is no. Further, since the focus is electrically held and there is no need to add a focus hold mechanism, the focus hold function can be added with a simple configuration with a small number of components. The voltage of the power source supplied to the pulse motor for the focus hold is a hold voltage different from the drive voltage at the time of focus drive by the voltage setting unit 40, more specifically, a shutter lower than the drive voltage at the time of focus drive. Since the driving voltage is set at the time of driving, the power consumption at the time of focus hold is reduced, which is extremely effective for a power supply battery of a camera having strict conditions in terms of capacity.
[0026]
Next, the operation when the shutter drive control is defective will be described with reference to FIG. FIG. 13A shows the operation after film loading, and FIG. 13B shows the operation when loading the film. FIG. 13 (a) shows that after the focus lens is extended and focused on the subject, MAG becomes “H” and the shutter operates. In synchronization with this, the strobe emits light and the shutter does not operate normally. PI remains “H”, indicating that photographing was not performed normally. After shooting, as described above, the returning operation to the origin of the focus lens and the feeding operation to the reference position are performed. Subsequently, the feeding motor 33 shown in FIG. 1 is driven to wind up the film by one frame. When the film is wound up by one frame, the feeding motor 33 is driven until a predetermined number of film perforations are detected, that is, until the number of PI signals output by perforation detection becomes eight as shown in FIG. Can be done.
[0027]
If the shutter drive control is defective, the PI signal does not change from “H” to “L” even if the MAG signal becomes “H”. Therefore, the shutter determination unit determines that the shutter drive control is defective and proceeds to the next operation. The release prohibition unit prohibits the next release. Incidentally, in the case of a defective shutter drive control, the PI signal is not inverted when the shutter is opened or closed, and therefore it can be determined that the shutter drive control is defective in any case. If it is determined that the shutter drive control is defective and the next release is prohibited, the back cover is opened and the film is reloaded. When the film is loaded and the back cover is closed, this is detected by the back cover closing operation detection unit, the shutter reset unit executes shutter reset, and the battery check is performed as shown in FIG. The shutter is opened by the signal. At this time, if the shutter drive control failure is restored and the shutter operates normally, the PI signal is inverted to “H”, “L”, and “H” by opening the shutter, and it can be seen that the shutter has returned to normal. In this example, the pre-winding, that is, the operation of pulling out the loaded film from the cartridge and winding it on the take-up reel is performed. Thereafter, the film is wound on the patrone side and set to the first photographing frame (FF set). If the PI signal does not invert even when the back cover is closed, it can be determined that the shutter drive control is defective, so that preliminary winding and subsequent FF setting are prohibited. At this time, it is displayed that the film set is defective.
[0028]
Operation when the back cover is opened / closed will be described with reference to the operation URAC_S flowchart shown in FIG. In FIG. 8, when the back cover is opened and closed, first, the shutter determination unit determines whether or not the shutter drive failure (NG) flag SNGF is set. When SNGF stands (when SNGF = 1), AESTEP described with reference to FIG. 10 is set to LOWEV. LOWEV is an EV value that is a long time in which the shutter speed is shaken when the subject brightness is further reduced. If AESTEP is equal to or higher than LOWEV, the LOWEV is a short time. At the same time that AESTEP is set to LOWEV, STBF = 0, that is, strobe light is not set, and shutter driving is executed at AE3_S. As a result of executing the shutter drive, if SNGF does not stand, preliminary winding is executed, and if SNGF is set again, preliminary winding failure is displayed and the operation ends.
[0029]
Even if the shutter drive control is defective and the next release is prohibited, if the shutter is reset and the shutter open / close operation is performed again, the shutter may recover and operate normally. Then, when the back cover opening / closing operation detection unit detects that the back cover is closed, the shutter reset unit executes a shutter reset before setting the film on the first photographing frame, and the shutter determination unit after the shutter reset again fails to perform shutter drive control. The film set defect is displayed for the first time, and if the shutter drive control defect is not determined again, the normal operation is started.
[0030]
Next, the strobe emission control calculation operation will be described with reference to FIG. When the release switch is pressed, the strobe emission control calculation operation FMSTEP is executed. First, the shutter time setting unit sets the shutter time based on the photometric data, and then the F value selection unit displays the ROM table shown in FIG. The F value AESTEP to be combined with the shutter speed is selected from the above, and whether or not this AESTEP is equal to or greater than the shutter speed high / low determination value FM_EV, in other words, the F value obtained by the F value selection unit is the shutter open value ( It is determined whether it is close to 4.00 in the illustrated example. Here, for example, FM_EV is set to EV11.5 at the 124th step in the table of FIG. When the shutter reaches the open value, that is, when the shutter speed is low, FMSTEP_LO is set. When the shutter does not reach the open value, that is, when the shutter speed is high, FMSTEP_HI is set.
[0031]
When the shutter speed is low, the strobe exposure calculation value SYSSTEP and the strobe exposure correction value FMSHIFT are selected from the table shown in FIG. 11, SYS-FMSHIFT is input to the register A, and then whether or not SYSTEM is equal to or greater than FMSHIFT. judge. In the example, FMSHIFT = 16 was set. If SYSTEM is less than FMSHIFT, the strobe FM control value FMSTEP = 0 and the strobe GNO control value GNOSTEP = 0 are set. Controls the flash firing. If the SYSTEM is FMSHIFT or more, it is determined from the table in FIG. 11 whether the SYSTEM is 5 or more. If SYSTEM is 5 or less, the strobe FM control value FMSTEP = A and the strobe GNO control value GNOSTEP = 0 are set, and the strobe is fully emitted to perform only FM control. If the above STEP is 5 or more, it is next determined whether or not the SYSTEM is 28 or more. If SYSTEM is 28 or less, according to the table of FIG. 11A, FMSTEP = 4, GNOSTEP = SYSTEM-4 are set, and the F value is set to a value that is reduced by one step from the open value, and the strobe FM control and strobe are set. Control is performed by a combination of GNO control. If the above-mentioned SYSTEM is 28 or more, according to the table of FIG. 11A, FMSTEP = SYSTEM-24 and GNOSTEP = 24 are set, and control is performed by a combination of strobe FM control and strobe GNO control.
[0032]
Next, when the shutter speed is high, that is, when the shutter does not reach the open F value or close to the F value, the shutter exposure calculation value AESTEP and the strobe light emission appropriate exposure adjustment value FM_EV_Y at the shutter high speed time are obtained and the difference between them is obtained. AESTEP-FM_EV_Y is input to the register A, and then it is determined whether A is 0 or more. In the embodiment, FM_EV_Y = 60. If A is 0 or less, A = 0 (that is, the open F value is 4.00 in FIG. 11B) is input to the register X. If A is greater than or equal to 0, it is then determined whether A is greater than 108. If A is greater than 108, A = 108 is input to register X. If A is less than 108, the value of A is registered in register X. To enter. The above calculation is performed by the F value determination unit.
[0033]
Next, the register Y is set to Y = ROM [EVTOF_TBL + X]. Here, EVTOF_TBL is set to FNO. This is the head ROM address of the table shown in FIG. Next, register A is set to A = SYSTEM-FMSHIFT, and it is determined whether the value of A is 0 or more. When the value of A is 0 or less, since there is no ROM address, both FMSTEP and GNOSTEP are set to 0, and the strobe FM control and the strobe GNO control are performed according to 0 step of each ROM table shown in FIGS. Shoot in combination. On the other hand, if A is 0 or more, register A is set to A-Y. If the value of register A at this time is 0 or less, there is no ROM address, so FMSTEP and GNOSTEP are set to 0 as described above. Then, shooting is performed with a combination of strobe FM control and strobe GNO control. When A is 0 or more, the GNO table shown in FIG. 11C has only 24 steps. Therefore, when A is 24 or more, A is set to 24. When A is 24 or less, A is set to that value. Is set, FMSTEP is set to 0, GNOSTEP is set to A, and shooting is performed by a combination of FM control and strobe GNO control. Such strobe photography is performed at the peak of the shutter operation waveform.
[0034]
As described above, when the strobe guide number is calculated by the guide number calculation unit, the F value at that time is obtained from the shutter time set by the shutter time setting unit using a ROM table prepared in advance. Since the strobe guide number is calculated based on the value, film sensitivity, and distance measurement data, it can be calculated quickly. In addition, since the F value corresponding to the shutter speed is detected from the above table and the GNO control calculation is performed based on the detected F value, the proper exposure can be achieved even when the lens shutter camera performs GNO control by daytime synchronization. Shooting by is now possible.
[0035]
【The invention's effect】
According to the first aspect of the present invention, when the F value calculated by the F value selection unit is in a range smaller than the first value from the opening. Fix the strobe guide number to the maximum value. Flash strobe with flashmatic control Light system The above F value is the above A value greater than the first value And If The F value is fixed to the first value and one stage Flashmatic control And guide number control Combined with strobe Light system Above When the control by the guide number becomes the minimum value of the flash guide number, the flash guide number is fixed to the minimum value. Controlled strobe Light system Therefore, even when the lens shutter camera emits strobe light during daytime synchronization, it is possible to shoot with proper exposure.
[0036]
According to the invention of claim 2, the shutter speed set by the shutter speed setting section F value corresponding to Is in a range smaller than the predetermined value The strobe guide number is fixed to the maximum and flash emission control is performed by flashmatic control. If the F value is larger than the predetermined value, the F value is fixed to the predetermined value, and one-step flashmatic control and guide are performed. The flash control is combined with the number control, and if the control by the guide number reaches the minimum value of the strobe guide number, the strobe guide number is fixed to the minimum value and the flash emission control is performed by flashmatic control. Therefore, even when the lens shutter camera emits strobe light during daytime synchronization, it is possible to shoot with proper exposure.
[0037]
The above In the embodiment, the F value at that time is obtained from the RON table from the shutter time set by the shutter time setting unit, but may be obtained by calculation. Also , Real In the embodiment, from the shutter time set by the shutter time setting unit, the F value at that time is obtained from the RON table to determine whether it is close to shutter release, but it is determined whether it is close to shutter release directly from the shutter time. Also good. Further, in the above-described embodiment, as described with reference to FIG. 13, the camera is a pre-winding camera. However, the present invention is not limited to the pre-winding camera, and the film is not preliminarily wound after the film is loaded. It may be a camera of the type set in the first frame.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a shutter and strobe control device of a camera according to the present invention.
FIG. 2 is a circuit diagram showing a specific example of a voltage setting unit in the embodiment.
FIG. 3 is a flowchart showing an example of a focus hold operation of the apparatus of the present invention.
4 is a flowchart showing an operation following the operation shown in FIG.
FIG. 5 is a flowchart showing an example of a focus drive voltage setting operation in the above operation.
FIG. 6 is a flowchart showing an example of a focus hold voltage setting operation in the above operation.
FIG. 7 is a flowchart showing an example of a focus off operation in the above operation.
FIG. 8 is a flowchart showing an operation example when the back cover of the device of the present invention is opened and closed.
FIG. 9 is a flowchart showing an example of a strobe light emission control calculation operation of the apparatus of the present invention.
FIG. 10 is a shutter speed / F value ROM table that can be used in the apparatus of the present invention;
FIG. 11 is a SYSYEP table, FM, and GNOROM table that can be used in the apparatus of the present invention.
FIG. 12 is a timing chart showing an example of lens driving and focus hold voltage setting operations of the apparatus of the present invention.
FIG. 13 is a timing chart for explaining the operation when the shutter drive control of the apparatus of the present invention is defective.
[Explanation of symbols]
1 Central processing unit
35 Shutter
40 Voltage setting part

Claims (2)

A camera having a lens shutter,
A shutter speed setting unit for setting the shutter speed based on photometric data;
An F value selection unit for calculating an F value at that time from the shutter time set by the shutter time setting unit;
A guide number calculation unit for calculating a strobe guide number based on the F value obtained by the F value selection unit, film sensitivity, and distance measurement data ;
Gyoshi flash onset optical system by flashmatic control to secure the flash guide number to a maximum value when the F value calculated from the F value selecting unit is in a range smaller than the first value from the open, the F value is the first 1 value Gyoshi flash onset optical system in combination of flashmatic control and guide number control of one stage to secure the F value to the first value if a large value and ing than control by the guide number flash camera made comprises a flash onset optical system Gosuru strobe light emission control unit by flashmatic control to secure the flash guide number to the minimum value, a case where the minimum value of the guide number. A camera having a lens shutter,
A shutter speed setting unit for setting the shutter speed based on photometric data;
An F value selection unit for calculating an F value at that time from the shutter time set by the shutter time setting unit;
When the F value corresponding to the shutter time set by the shutter time setting unit is in a range smaller than a predetermined value, the strobe guide number is fixed to the maximum and the flash emission control is performed by flashmatic control. Is larger than the predetermined value, the F value is fixed to the predetermined value, and the flash emission control is performed by combining one-step flashmatic control and guide number control. The control by the guide number is the minimum of the strobe guide number. camera comprising a, a strobe light emitting system Gosuru strobe light emission control unit by flashmatic control to secure the flash guide number to a minimum value when a value.

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