JPH0244877A - Camera with sound recording function - Google Patents

Abstract

PURPOSE:To prevent the malfunction of a sound input circuit due to the drop of power supply voltage by inhibiting the charge of a flash using a control circuit when a sound recording means operates and a sound is recorded as being accompanied with photographing. CONSTITUTION:A means to inhibit the charge of the flash 41 through the control circuit when the sound recording means 29, 30 operate and the sound is recorded as being accompanied with the photographing is provided. Besides, the means to inhibit the charge is constituted of a CPU 1. Thus, by inhibiting the charge of the flash 41 when sound recording is performed, such a trouble that an electronic circuit like the sound input circuit, etc., in the sound recording means occurs the malfunction because of the temporary drop of the power supply voltage at the time of the start of the charge of the flash 41 can be prevented. Besides, such the trouble that the oscillation sound of a boosting transformer, etc., used for a charge circuit is recorded can be prevented.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a camera with an audio recording function.

[Prior Art] In a camera with a recording function, such as a still video camera, audio is usually recorded in correspondence with video, and approximately 10 seconds of audio can be recorded in one track. Furthermore, input audio signals and the like are recorded on a recording medium such as a floppy disk using an electronic circuit such as an audio input circuit and a magnetic head.

[Problems to be Solved by the Invention] By the way, in this type of camera, if the flash mounted on the camera is activated when the shooting screen is low brightness or backlit, it is difficult to turn off the flash immediately after taking a picture. If the battery of the camera is charged, the battery voltage will drop from time to time during flash charging, which may cause electronic circuits such as the audio input circuit to malfunction during signal recording processing.

Further, since this type of charging circuit has a boosting oscillation circuit using a transistor or the like, there is a possibility that the oscillation sound of the boosting transformer may also be input if audio recording processing is performed during the charging operation.

The present invention solves the above problem and provides an audio recording function that prevents audio input circuits from malfunctioning due to a drop in power supply voltage by prohibiting flash charging at least when recording audio. The purpose is to provide a camera with

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a recording means for recording audio, a flash that is emitted when the exposure amount during photography is insufficient, and charging of the flash is controlled. In a camera that is equipped with a control circuit and shares a power source for recording and charging the flash, when the recording means is activated to record audio while taking pictures, charging of the flash by the control circuit is prohibited. It is equipped with the means to do so.

In addition, the means for prohibiting the above-mentioned charging is CP in the following embodiment.
It consists of a UI.

[Function] In the above configuration, while the recording means is operating and recording audio, charging of the flash is prohibited. Therefore, the power supply voltage does not drop during that time, and the audio recording operation of the recording means is prevented. It will be done right.

[Effects of the Invention] As described above, according to the present invention, since charging of the flash is prohibited during audio recording,
It is possible to prevent electronic circuits such as the audio input circuit in the recording means from malfunctioning due to a temporary drop in power supply voltage at the start of charging the flash. Further, it is also possible to prevent the oscillation sounds of the step-up transformer used in the charging circuit from being recorded.

Note that the present invention is not limited to the still video camera shown in the embodiment, and can be applied to various cameras. (Hereinafter, blank spaces) [Example 1] Fig. 1 shows a block configuration of an embodiment of a still video camera equipped with an audio recording device of the present invention.

In the figure, 1 is a central processing unit (hereinafter referred to as CPU) that controls the entire camera, 2 is a group of various switches that input command information etc. to the CPU (details will be described later), and 3 is a power circuit section. Main battery 4, booster circuit 5 for obtaining power for CCD (described later), backup battery 6, CPU
Regulator 7 for obtaining power for use and general circuits
Consists of etc.

Reference numeral 8 denotes an autofocus (AF) circuit section, which includes an AP circuit 9 that outputs focus and distance information to the CPU, a lens extension motor 0, a lens stop magnet 11, and a lens position detection encoder 12. 13 is a lens switching/barrier opening/closing circuit; 14 is its motor; for example, when the motor 4 rotates forward, the lens is sequentially switched between standard and close-up; when the motor 4 rotates in reverse, it is located in front of the lens, and has the function of an optical path shielding plate. The barrier is then opened and closed.

Reference numeral 15 denotes an automatic exposure (AE) circuit section, and this circuit section 15 is a spot photometry circuit that receives as input the detection signal of the photometry element SP that measures the subject brightness at the center spot of the shooting screen! 1
t816, a photometry circuit 17 that inputs the detection signal of the photometry element AVE that measures the brightness of a subject in the peripheral area of the photographic screen; an A/D conversion circuit 18 that converts these detection data from A/D;
There is one serial communication interface that receives this A/D conversion data and performs serial communication with the CPU, and there is a serial communication interface that receives this A/D conversion data and performs serial communication with the CPU.In order to obtain appropriate exposure based on the commands from the CPU that are input through the same interface, as described later, a weighting circuit 20 that weights the detected data;
It consists of a level shift circuit 21 that shifts the level of a signal based on the output of the weighting circuit 2o and a command from a CPU via an interface.

Reference numeral 22 denotes a circuit section for controlling the actual closing timing of the CCD shutter based on the output from the AH circuit section 15, which connects a capacitor 25 for timekeeping and an opening circuit at the timing of opening of the shutter shutter. The circuit includes a switch 26 which releases the short circuit of the capacitor 25, and comparators 27 and 28 which compare the potential V at the connection point between the capacitor 25 and the output part of the level shift circuit 21 with reference potentials VO and Vl.

23 is the release signal and C for shooting the CCD shutter.
A control circuit that opens based on a pulse signal from the CD driver 32 and closes when a predetermined exposure is obtained by the output of the comparator 28 of the circuit section 22 or a forced close signal from the CPUI, A shutter opening/closing signal is output to the CPUI and CCD driver 32.

Reference numeral 24 is a gain control discrimination circuit, which detects when the predetermined exposure (exposure amount less than the appropriate exposure by a predetermined amount) is not obtained even after the camera shake limit time is exceeded based on the output of the comparator 27 and the close signal from the shutter control circuit 23. etc.,
A signal for electrically controlling the gain of the video recording image signal is given to the CPU 1.

29 is a microphone for recording, 30 is an audio circuit that operates in response to a recording control signal from the CPUI, and the output of this audio circuit 30 is given to a video recording circuit 34, which will be described later.

31 is a CCD image sensor (hereinafter referred to as COD), which is a solid-state imaging device that converts optical image information into electrical signals;
2 is a driver that drives the CCD 31, and this CCD driver 32 receives the output of the COD shutter control circuit 23, C
It operates in response to the ISO sensitivity switching signal from the PUI, the synchronization signal PG generated in synchronization with the rotation of the floppy disk, etc.

34 is a video recording circuit for magnetically recording images and audio onto a floppy disk, and 35 is a magnetic head thereof. Digital information signal (year, month, day, track number, etc.) displayed simultaneously with the image, gain control output, synchronization signal PG
It operates according to the following.

36 is a spindle motor driver for driving the floppy disk to rotate at a constant speed according to a command from CPtJl, and 37 is a spindle motor.

38 is the magnetic herad 35 according to the command from the cpui.
The stepping motor driver for moving the 3 is a stepping motor, and this stepping motor 3
9, the magnetic head 35 is controlled to move to a predetermined track position on the floppy disk. 40 is a head holding plunger for setting the head in a predetermined position during recording (writing).

41 is a flash that fires when the exposure amount is insufficient during shooting, and it has a built-in charging circuit and booster circuit for flashing.
The boost operation is started by the boost signal from cpui, and the CP
Based on the charging completion monitor signal from the UI, a charging completion signal is output to the CPU when charging is completed. Also, CPUI
The flash is emitted by a light emission trigger signal from.

42 is a circuit to the camera 1 for preventing abnormal operation when the power supply is low, and 43 is a circuit for blinking when the CCD shutter is not opened in a self-timer mode during photographing. LED, 44 is a buzzer that generates a sound to warn the user when the floppy insertion part's deck lid is left open, and 45 is activated by the output of CPU 1 and displays various camera information and settings. This is a display section for displaying the mode etc. on an LCD or the like.

The components of the switch group 2 include the main switch SO1 and the switch S for performing photometering and distance measurement prior to photographing.
1. Release switch S2 when performing a photographing operation; Recording switch S3 for selecting a recording mode or not.
Switch S4, date switch to switch between single shooting (S, which is the standard mode), quick shooting (C), which takes multiple shots in succession, and self-timer shooting (SELF). information changeover switch S5,
A switch S6 to correct the information to data 1, a switch S7 that detects the open/closed state of the deck lid, a switch S8 that detects the insertion state of the floppy disk, a switch S9.1.0 that detects the presence or absence of the write-protection claw of the floppy disk. Switch S detecting position and closed position
IO, Sll, switch S that detects the initial position of the lens
12. A lens changeover switch 813 for setting the lens in a close-up state during close-up photography, and a switch S14 for detecting the close-up lens position (close-up state) and hanging position (stand-start state), respectively. It consists of a switch S15 and a switch S16 that detects the initial position of the magnetic head.

Here, the CPUI is equipped with various functional configurations such as a self-timer means and a sequence control means to be described later, and the setting information such as the recording switch S3 and the mode changeover switch 84 is input by the user before shooting and is stored in the memory within the CPUI. Based on this memory information, the CPU executes predetermined program operations, and camera operations such as video recording and audio recording are performed.

Particularly, in the present invention, when the self-timer mode is selected and set using the mode selector switch S4, recording is performed during the self-timer count before taking an image, whereas when the self-timer mode is not selected, recording is performed after the end of taking the image. , the sequence is automatically switched by the CPU 1.

Hereinafter, the operation of this camera will be explained according to the flowcharts shown in FIGS. 2 to 7.

FIG. 2 shows the main flowchart. In the figure, when the power is turned on to the CPU 1, the CPU 1 is reset (#1), the reset flag is set to "1"(#2), the flag and RAM are initialized, and the lens and magnetic head 35 are set to their initial positions. Perform the initial settings (#3). In addition,
If this reset flag remains at "1", it means that the date has not been corrected as described later, and such date information is not recorded on the floppy disk, so it is not possible to record the date information on the floppy disk. Warning is given by flashing the part. Next, check to see if there is a battery (#4), and if there is no battery, perform the battery removal routine (#5), and if there is a battery, check the status of the main switch SO (#6).

If the switch SO is currently ON, check the open/closed state of the deck, the presence or absence of a floppy disk, the presence or absence of a recording prohibition claw, and whether the deck lid has just changed from opening to closing (#7
~ #10) If the deck lid has just been closed, an unrecorded track on the floppy disk is located in the initial load routine, and the magnetic head 35 is moved to that position (#11).

After that, if the judgment in #10 becomes No, check the status of the photometry/distance measurement switch S1 (#12), and if it changes from OFF to ON, perform the photometry/distance measurement, exposure, and subsequent various steps. The S1 sequence (shown in FIGS. 3 and 4) consisting of the following is processed (#13 and #14). If switch S1 is OFF or has remained ON, the S1 sequence does not proceed and the state of the lens close-up switch 313 is checked (#15) - If this is turned ON, the lens switching routine (#16) is started. ).

Next, check the state of the mode selector switch S4 (#17
), when this is turned on, the date flag is set to r OJ,
If it is the date switching correction mode, exit this correction mode (#18) and execute the mode change routine (#19).
). Through this mode change process, as described above, one of the shooting modes of single, continuous shooting, and selfie is stored in memory. Next, check the status of the recording switch S3 (#20), and if it is turned on, the date flag will be set to "0" and if the date changeover correction mode is 1, it will be removed from this correction mode. (#21), and processes the recording switching routine (#22>).

The close-up switch 313, the mode changeover switch S4, the recording switch 83, etc. all change to a different state each time they are pressed (turned on), and return to the original state when they are pressed as many times as they exist.

After that, check the status of the date selector switch S5 (#23
), when this is turned ON, the date flag is set to "1" and the date switching correction mode is entered (#24), and the reset flag is set to "0" to enable recording of date information.
25) After a predetermined period of time has elapsed, start a date timer to exit this switching correction mode (#26).
, process the date switching routine (#27). Then,
Check the date flag (#28), and if it is "1" and the date correction switch S6 is turned on, start the date timer anew (#29 and #30), and perform a date correction routine (#31). process. When the date correction switch 36 is turned OFF and the date timer time elapses (#
32 (YES), set the date flag to “0” (#33
), exit the date switching correction mode 6. Also, as will be described later in the S1 sequence, turn on the photometry/distance measurement switch S1.
Even so, it is now possible to escape from the date switching correction mode.

After that, check whether the charging circuit of the flash 41 needs to be boosted (#34), and if boosting is necessary, check whether charging is complete (#35), and if not, start boosting the voltage (#36). , return to step #4 above. Also, when the main switch SO is OFF in #6 above, and #34 above. Although boosting is not necessary in #35, if charging is complete, stop boosting the voltage (#37), start the first timer that measures the non-operation state (#38), and wait until a predetermined time has elapsed (#37). Check the open/closed state of the deck lid (#44), and check whether it is closed, or even if it is open, until a predetermined time period according to a second timer (described later) has elapsed (#45: No). Main+S0,31,83. S4.
S5. Check whether there are any changes in the condition of S6 or the deck lid (#
47), if there is a change, return to #4 above; if there is no change, return to #39.

Also, when the predetermined time set by the first timer has elapsed in step #3 above, check the setting mode (#40), and if it is selfie or continuous shooting mode, change to the standard single mode (#41). , further check the condition of the lens (
#42), if it is close-up, change to stunt start #43), then proceed to #44 above. Additionally, if the predetermined time set by the second timer has not elapsed in #45 above, the buzzer 44 issues a warning of 6 (#46
). Furthermore, as is clear from this flowchart, when D-'rM is open, no input is accepted.
Only date corrections are possible.

Also, if the deck lid is open in #7 above, proceed to #48, and if it has just changed from closed to open, start the second timer (#49), and continue until the predetermined time elapses. and #8 above. If there is no floppy disk in #9 or there is no claw (i.e. recording is prohibited), stop boosting the voltage and press (#9).
51), without checking the status of the switch 81, etc., proceed to #23 above, and when the predetermined time of the second time elapses, a warning is issued in the same manner as above (#52). Further, when the deck lid is closed, the warning is stopped (#53).

Next, an example of the S1 sequence of #14 will be described with reference to FIG. In this example, recording is prohibited during rapid shooting, and recording is performed after continuous shooting, and moreover, when the self-mode is selected, recording is performed during the self-timer.

In Fig. 3, the voltage increase should be stopped in order to prohibit charging during recording/recording (#61), and the date fair lag should be set to "0", that is, the date switching correction mode should be exited by turning on the switch S1). (#62), check whether self mode is stored in memory (#63),
If it is not self, it will immediately go into recording standby.
The spindle motor 37 that drives the floppy disk is oNr (
If #64L is self-timer, the spindle motor 37 is not turned on at this point to save power while the self-timer is counting.

Next, distance measurement and photometry/AE calculation routine (described later) are performed.
865, #66), it is checked from the calculation result whether or not boosting is necessary (#67), and if it is not necessary, it waits for the release switch S2 to be turned on (#68). When the switch S2 is turned on, it is checked whether the self mode is stored in memory (#69), and if it is not the self mode, it immediately processes the self sequence (#70) described later if it is the self mode, and the spindle motor 37
ONL (#71), then open the barrier (#72)
), operates the lens extension motor 10 to extend the lens to the in-focus position #73, processes the release routine (#74) described later, and records the image onto a floppy disk using a recording device such as the video recording port #134. I do(#
75). In this recording step, date information of year, month, day and track number are also recorded at the same time. Note that when not in self-mode, recording is performed after the image is taken, so
I haven't done it yet at this point.

After that, the magnetic head 35 is sent to the next empty track (
#76), reset the lens #77), check whether the memory information for mode selection is continuous shooting mode (#78),
If not in continuous shooting mode, reset continuous shooting flag 2#
79) To finish recording the image, turn the spindle motor 37 to 0FFL (#80), close the barrier (#81), and return the lens to the standard position. (#82.#83).

Furthermore, if it is not self mode (No in #84), check the memory information according to the setting of the recording switch S3 (#85
), if it is in recording mode, the recording operation begins. Set the recordable timer time T of the audio memory to 9.6 seconds (s) #86) and start the audio memory (#87).

Then, the timer counts down and checks whether T-0 is reached (#88), and before reaching that point, it is checked whether the photometry/distance measurement switch S1 has been turned from OFF to ON (#89).

Here, in order for the operator to indicate his/her intention to stop recording midway through, switch S1 is set to turn ○FFL ON again, so if YES in #89, that is, to stop recording, , set the count of 83 (described later) to r□ (#90), and end the audio memory (#95>).

If No in #89 above, check the state of the main switch SO (#91), and if it turns OFF, reset the audio memory as an indication of your intention to stop the current recording from the beginning #92), and process the audio recording. The process moves to #4 of main flowcharts 1 to 4 in FIG. 2 described above. If the main switch SO remains ON in #91 above, then check whether the recording switch S3 has changed from OFF to ON (#93).

This is because the user indicates his/her intention not to perform additional recording for one captured image by pressing the recording switch s3. That is, recording switch S3
When you press once, the 83 count is incremented by 1 (#94>, and the process returns to #88.
As the count is incremented, the process returns from #100 to #86 via #101, as will be described later, and the recording timer is set again, making it possible to perform additional recording by the number of 83 counts.

When the timer reaches T=O, end the audio memory #95
), the spindle motor 37 is turned on (#96), and audio is recorded (#97). Here, the track number and the audio support number 1 to easy number are displayed.

Date information such as year, month, and day is not recorded.

Next, move the magnetic head 35 to the next empty track (#
98), spindle motor 37 to 0FFL (#99),
Check the S3 count (#100), and if it is "0", return to standard single if the mode is self or continuous shooting (#1゜2.1103), then return to #4 of the main flowchart. . Further, if #100 is S3 count or 0, it is decremented by 83 counts (#101), and the process returns to #86. In this way, additional recordings are made.

Incidentally, in the recording mode at #85, the process moves to #102 without processing the steps of the recording operation described above.

Also, if continuous shooting mode is set in #78 above,
Continuous shooting is executed by setting the continuous shooting flag 2 to "1"(#104), returning to #65, and cyclically processing the above routine. Here, no recording was made during continuous shooting.

In addition, in #68 above, if the release switch s2 remains OFF or becomes OFF, check the continuous shooting flag 2,
If continuous shooting is not in progress, check the open/close status of the deck lid, the status of the main switch So, and the status of the metering/distance switch S1 (#106 to #108), and check whether each is closed, ON, or
If ON, return to #66, open, OFF, 0FF (7)
If any of the above applies, proceed to main flowchart #4.

On the other hand, if the continuous shooting flag 2 is "1" in #]05, the continuous shooting operation is canceled and the process moves to #79 above.6 On the other hand, in #67 above,
If it is determined that the voltage needs to be boosted, check whether charging is complete (
#109) If charging is complete, proceed to #68 above, but if charging is not complete, check to see if there is bright backlight (#110). As a result, if there is bright backlight and the release switch S2 is turned on (YES in #111),
S), proceed to #69 above, but otherwise go to check continuous shooting flag 2 without indicating whether continuous shooting is in progress (#112
), if continuous shooting is in progress, a so-called uncharged lock (occurs when it becomes dark during continuous shooting) occurs, stopping continuous shooting and proceeding to #79 above. If continuous shooting is not in progress, turn off the spindle motor 37 to save power during charging (#113).
), start increasing the voltage (#114>. After that, check whether charging is completed (#115), and if charging is completed, stop increasing the voltage (#116), and check again for bright backlight (
#117), if YES, turn the spindle motor 37 to O.
N (#118) and return to #66 above. If No, return to #4 of the main flow.

Also, if charging is not completed in #115 above, the deck lid,
Check the status of the main switch so and the photometry/distance measurement switch S1 (#119 to #121>, respectively closed, ON,
If it is ON, check to see if there is bright backlight, and if there is bright backlight, check the status of release switch S2 (#123>
, if this is ON, stop boosting the voltage while waiting for charging to complete (#124), and turn on the spindle motor 37 (#125).
) and start shooting < (Proceed to #69). Also, #1 above
22 All judgments are No, that is, when it is dark, or #12
When the release switch s2 is OFF at #3, the above #1
Return to 15. In addition, the deck lid opens in steps #119 to #121 above, and the main switch s is turned on.

is OFF, and when the photometry/distance measurement switch s1 is OFF, exits from the S1 sequence and moves to #4 of the main flowchart.

Note that if the self mode is stored in memory and the sequence of the same mode (#70) is not processed, recording has already been completed, so the process directly proceeds from #84 to #96.

The S1 sequence shown in Figure 3 above is recorded after continuous shooting (
However, as will be described later, in this embodiment, recording is performed during self-timer counting, but below, an embodiment in which recording is performed during continuous shooting will be described with reference to FIG.

In FIG. 4, in this embodiment, if the continuous shooting mode is #
The process advances from 78 to #104, and after setting the continuous shooting flag 2 to "1", a recording operation is performed. That is, timer T=9.6 seconds (
s) should be set #201>, and the voice memory should be started #
202), the process returns from #203 to #65 until T=O, and thereafter, this routine is repeated to perform continuous shooting and recording.

When T=O, end the audio memory #204>, set continuous shooting flag 2 to "0"#205), and close the barrier (#205).
206>, after returning the lens to standat (#207
．． #208), skipping the recording routine and proceeding to #97 to record the audio.

Also, go from #68 to #105, and here continuous shooting flag 2
If it is "1", it is determined that continuous shooting has stopped, so the continuous shooting flag 2 is set to "0"(#209), and the spindle motor 3
7 oFpL (#2tO) close the barrier (#211),
After returning the lens to the standat (#212.#213
)= Moving on to #88, what follows is the remaining time on the timer? f Continue recording. Also, when proceeding to #112 with uncharged lock, if continuous shooting flag 2 is "1", the above #20
Similar to steps 9 to #213, processing to stop continuous shooting is performed in steps #214 to #218, and the process moves to #88.

In addition, in this embodiment, additional recording cannot be performed after recording ends after 9.6 seconds have elapsed during continuous shooting, and if continuous shooting ends (switch S2 is turned off or the battery is not charged) before 9.6 seconds have elapsed, , it is now possible to record additional audio. Further, according to the S1 sequence shown in FIGS. 3 and 4, the barrier is kept open during continuous shooting in order to reduce the time lag.

Furthermore, the corresponding video track number for audio during continuous shooting can be made to correspond to the track number of the first (first stage of continuous shooting),
It can also be made to correspond to all track numbers.

Next, repeat the self mode sequence in #70 above in the fifth step.
This will be explained using figures.

Set timer T to 9.6 seconds (s) #301) and start voice memory and self-count #302. #
303), during timer counting, the LED is blinked to indicate that self-counting or recording is in progress (#305). And while recording, #306. #308
If the deck lid is opened or the main switch SO is turned off.
When it is FF, please reset the voice memory by self-cancelling as an indication of your intention to stop recording from the beginning #308).
Return to the main flowchart. If the recording does not continue until the timer counts up (YES in #304), end the audio memory in #309>, #7 in the S1 sequence.
Move to 1.

In addition, to record the audio memory to the floppy disk in self mode, after recording the image (#75 in Figures 3 and 4),
This is done in #97. Also, during self-count, LE
In addition to blinking D to indicate self-count and recording, this self-service LED also doubles as a display to indicate that recording is in progress when recording during normal shooting (for example, single mode). Good too.

Next, #66 photometry/AE in the above S1 sequence
The calculation sequence will be explained with reference to FIG.

16.17 Photometric elements SP, AVE and photometric circuit
Photometry is performed (#401), and the photometric analog data is A/D converted by the A/D conversion circuit 18 and taken into the CPUI (#402 to #404).

Next, check whether the switch S1 is AF locked without being pressed (#405), and if NO, the brightness photometric value Bv of the center (spot) is determined from the brightness photometric value Bv2 of the surroundings (above).
1 to find the brightness difference ΔBv (#406), and subtract a predetermined correction value α according to ΔBv from the photometric value Bv1 of the spot to find the main subject brightness BvS (#4
．． 07), and the above-mentioned Abe photometric value By2 is set as the background, that is, the sub-subject brightness BvA (#408>. Also, #405
If it is AF lock, #406. Proceed to #408 without processing #407. Here, the AP lock at #405 is #1 in the 81 sequence in Figures 3 and 4.
This is only the case when moving from #08 to #66 and performing photometry/AE calculations.

Next, check whether the lens is in a close-up state (#409>, if NO, calculate the difference between the sub-subject brightness BvA and the main subject brightness BvS calculated above, that is, the degree of backlighting ΔBvS (#410>, Compare this value with the backlight detection level δ (#411). If ΔBvS is smaller than δ, the degree of backlighting is considered to be small (frontlighting), and the weighted main subject brightness Bvs- is 1/8 B v S.
Use +7/8 B vA (#412), while #4
11, if ΔBvS is larger than δ, the degree of backlighting is large (backlighting), and a backlight flag is set as "1"#4
15), BvS is set to Bvs- (#416>.

These weightings are performed by weighting circuit 20 (FIG. 1).

When the above process #412 is performed two times in a row, Bvs
” Checks whether the brightness is higher than the camera shake limit brightness BvH (#414), and if it is YES, it is judged that the brightness is brighter than the camera shake limit brightness, enters natural light shooting mode, and selects No.
I judge it to be dark and enter dark flash photography mode■. Also, when the process of #416 is performed, check whether the sub-subject brightness BvA minus the backlight detection level δ is greater than or equal to the camera shake limit brightness BvH (#41.7
), if YES, it is a bright backlight, so set it to ``1'' and enter the backlight flash photography mode ■, while if NO, it is a backlight, but the background is dark, so use the dark flash. Enter shooting mode ■.

First, natural light photography mode (2) will be explained.

In this mode, the initial setting ISO sensitivity SvO determined by the CCD 31 corresponding to the film is set as the sensitivity value Sv.
419), the maximum brightness BvM that can control proper exposure when the subject brightness is extremely bright, and the maximum shutter speed T
From v M, the value Av corresponding to the aperture of the lens, and the value Sv corresponding to the sensitivity of the CCD (both are apex values), B
Let vM=TvM+Av-8v (#420).

Next, the Bvs- obtained in #412 above and the BvM above
Compare the magnitude of #421), if Bvs is larger than BvM, it is too bright, so set the sensitivity value Sv to 5vO-1
is used (#422), and if BvS- is not greater than BvM, the step #422 is not performed, the boosting is determined to be unnecessary (#423), and the process moves to the S1 sequence.

Next, dark flash photography mode (2) will be explained.

In this mode, compare the main subject brightness BvS plus IEV and the camera shake limit brightness Bv] (#42
4) If it is smaller than -BvS+1 or BvH, the main subject brightness BvS plus IEv is set as the control brightness value BvT (#425). As a result, when using only natural light, the main subject will be photographed at an IEV level below the appropriate value. On the other hand, if it is smaller than BvS+1 or BvH, the main subject is dark, so the camera shake limit brightness BvH is set as the control brightness value BVT (#426).

Furthermore, in order to calculate the correction value for flash dimming, we calculate the value ΔEvN, which indicates how much the main subject will be undershot from the appropriate level when photographing in full natural light, and calculate the main subject brightness Bv
Obtained from the difference between S and the above control brightness value 13vT (#427)
, check whether this value ΔEvN is larger than IEv (#428>, and if it is, set ΔEvN to −IEv).
429), then check whether ΔEvN is 13EV or less (#430), and if YES, set the correction value I to 0 (#431); if No, that is, Δ
When EvN is between -1 and -3, the correction value K is 1/2)
ΔEvN+<3/2) (#432).

Next, check whether the main subject distance is 5m or more (#4
33), if it is 5m or more, flash dimming correction value ΔE
VFL to above correction value] (Please set +0.5 #434)
, if it is less than 5 m, the tuning light correction value ΔEvFL is set to the above correction value (#435).

Next, set the initial setting ISO sensitivity SvQ to I of CCD 31.
The SO sensitivity value Sv is determined by #436), and the controllable maximum brightness BvM at the brightest time is determined by the maximum shutter speed TvM, the lens aperture value AV, and the above sensitivity value Sv.
After setting BvM=TvM+Av-Sv (#437), it is checked whether the control brightness value BvT is equal to or higher than the maximum controllable brightness BvM determined above (#438). If the comparison result is YES, it is a bright time, and the ISO sensitivity Sv is set to 5vO-1 #43
9), then the maximum controllable brightness BvM-
Similarly, using T v M +A v −S v (
#440), check again whether the control brightness value BvT is greater than or equal to the maximum controllable brightness BvM (#441), and if the comparison result is YES, check the error (#442) and check if the flag is set. Compare the main subject brightness BvS and the maximum brightness value B v M'' above (#443). If BvS is greater than BvM-, the brightness of the main subject is bright even if it is backlit and no flash is necessary, so set the intermittent flag to `` 0
” (#444) and shifts to natural light photography mode ■.

Above #438. Comparison result of #441 and #443 is N
o, and when the error in #442 is 0, go to #445 and control the flash emission timing Tv by setting the brightness value BvT, ISO sensitivity value Sv, and lens aperture value A.
From v, it is assumed that Tv=BvT+5v−Av. Furthermore, it is checked whether the flash emission timing Tv is greater than or equal to the maximum shutter speed TvM (#446), and if Tv is smaller than T' v M,
The same timing Tv is the touch limit shutter speed Tv
Check whether it is less than H (#447) and select TV or T v
If it is larger than H, the Tv obtained in #445 above is left unchanged and a flag indicating the need for boosting is raised (#448), and S1
Move to Siegen. Also, when the determination in #446 and #447 is YES, Tv is set as 'T'vM, respectively.
(#449), set TvH (#450) and #448
Proceed to.

Next, backlight flash photography mode (2) will be explained.

In this mode, the sub-subject brightness BvA-1 is used as the control brightness value BvT (#451.). As a result, when the main subject is properly exposed, the background will be photographed at an overexposure of IEv. After the process of #451, the process moves to #427, and the same process is performed thereafter.

In addition, in #409 above, if the lens is in a close-up state, proceed to #452, and the camera shake limit brightness value at close-up is BvCU, and the camera shake limit shutter speed T.
vH and close-up aperture value AvCU and initial setting I
From SO sensitivity SvO, BvCU=TvH+AvCU-3
vO, then compare this camera shake limit brightness value 13vCU with the sub-subject brightness BvA (#453), and BvA is 13v.
If it is larger than cU, the sub-object brightness BvAl-0,75
As the control brightness value BvT (#454), the flash emission timing Tv is determined from the above BvT, the initial setting ISO sensitivity SvO, and the aperture value for close-up AvCU as Tv = BvT + 5vO - AvCU (#455), and the boost is necessary. #456), S1
Return to Siegens. In addition, if BvA is smaller than BvCU, the camera shake limit shutter speed T v HC during close-up is set as the flash emission timing Tv (
#457), proceed to #456 above.

Next, the release sequence (#74.) in which C is applied to the S1 sequence will be explained with reference to FIG.

This release is controlled based on the photometry/AE calculation results.

If the lens is not in close-up mode and strobe light is not required (NO in #501 and #502), natural light photography will be used, and the center spot (SP) of the light receiving area and the surrounding area (AV
Using the luminance data of E) (#503), the photometry/AE
Calculation Sequence is calculated in #412 and weighting is added based on vs. (#504>. This is based on C
Weighting is performed by the circuit 20 based on a command from the PU1. Then, the timer t1 is set to the camera shake limit time t, □, and light adjustment (exposure) is started when the timer is started (#505, #506). Here, -T v H.

tH=2 After the start of dimming, the reference standard potential VO that sets the appropriate exposure in the circuit 28 that controls the opening time of the shutter shown in FIG. The exposure is finished when the comparison becomes 0≧■. (#511).

If the timer reaches t1-0 before reaching this ■0≧■ (YES in #508), compare the reference potential V1 (>VO) and the control potential V (#509), and if V is higher than Vl ( #509: NO) Even after the camera shake limit time has elapsed, the subject is dark and the exposure is still insufficient, so increase the gain by a predetermined amount at gain control determination #t24.
522), and the exposure is completed (#511). Also, # above
If 509 is ■1 or 7 or more (#509 is YES),
Exposure is ended (#511) without changing the gain. Note that after the exposure is completed, the process proceeds to #75 of the S1 sequence.

On the other hand, if strobe light is required (YES in #502)
), use the brightness data of only the center spot (SP) of the light receiving part (#512, add the ΔEvFL and Sv calculated above as correction values #513), and use the Bvs- calculated in #416 above. 514), check whether it is backlit from the above-mentioned intermediary flag (#515), and if it is backlit (intermediate flag - ○), process #516 to #522 below,
It's backlit (intermediate flag -1), #523-#527
is processed and the exposure is completed (#51.]).

In any of these processes, a timer of 1tA and a timer of t2-tH and tF are set.

-T v -・Here, at tA=2, T until Fufunyu light emission
vH is the hand wave timing time, tH-2 is the limit time, and tF is the flash emission time.

Then, natural exposure is started by timer start, and tl
When the value reaches -0, dimming is started by flash emission.

Regarding the processing after the start of light adjustment, when there is no backlight, the timer t1 in the case of shooting with only natural light as described above is used.
It is the same except that timer t2 is used instead of , and since it is brighter when backlit than when it is not backlit, it is necessary to process whether to increase the gain when timer t2-0 is reached. Exposure is immediately terminated (#511).

Also, when the lens is in close-up mode, #5
28 to #536 are performed, and the exposure is completed (#511). That is, in this process, similar to #503 above, the brightness data of the center spot (SP) and the periphery (Ave) of the light receiving section are used, and the correction of AvCU is added, so that Bvs-= (3/4)BvS+ ( 1,/4) BvA
Then, the same processing as #523 to #527 for backlighting described above is performed. In addition,
Let the camera shake limit time during close amplification be - T v HC.

In addition, in the above embodiment, weighting is added in the case of close-up and natural light modes, but weighting may also be added in backlighting, or the value may be determined separately. You can.

three

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a still video camera according to an embodiment of the present invention, FIG. 2 is a main flowchart showing the operation of the camera, and FIG. 3 is a flowchart 1 showing an example of the sequence of switch S1. Fig. 4 is a flowchart showing another example of the sequence of switch S1, Fig. 5 is a flowchart of the self-sequence, and Fig. 6 is a photometry/A
FIG. 7 is a flowchart of the E calculation sequence. FIG. 7 is a flowchart of the release sequence. 1... CPU, 3... Power supply circuit section, 2... Microphone, 30... Audio circuit, 35... Magnetic head, 41... Flash, S3... Recording switch.

Claims (1)

[Claims] (1) Equipped with a recording means for recording audio, a flash to emit light when the exposure amount is insufficient during shooting, and a control circuit to control charging of the flash, and the power source for the above-mentioned recording and flash charging is shared. 1. A camera having an audio recording function, characterized in that the camera is equipped with means for prohibiting the control circuit from charging the flash when the recording means is activated to record audio in conjunction with photographing.