JPH05281600A - Camera operatable at low voltage - Google Patents

Abstract

PURPOSE:To enable the operation of a camera even at low voltage without harming compactness by securing the voltage to enable a power circuit of large current capacity to start action by the other power circuit. CONSTITUTION:Two power circuits of different types are used to boost the voltage of a battery 30. The first power circuit 31 is formed of four switches and two capacitors, and outputs sufficiently high voltage even at low input voltage although the output current is small. The second power circuit 32 formed of a chopper type switching regulator can supply a large output current but cannot be started unless input voltage or output voltage is the specified value (3V) or more at the operation starting time. In order to enable the second power circuit 32 to start operation (pressure boosting) stably even when the battery voltage becomes lower than 3V, the output voltage 3V to enable the operation of the second power circuit 32 is secured by the first power circuit 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera which can operate at a low voltage.

[0002]

2. Description of the Related Art In recent years, high functionality of cameras (multi-element autofocus, high speed, power zoom, control involving complicated operations such as fuzzy control, etc.) has been realized.

[0003]

However, in order to improve the functions of the camera, a high-performance microcomputer is required.
It is necessary to use (high speed operation). Along with this, the current consumption increases. In addition, in order to pursue miniaturization, it is necessary to design a circuit system with a 3V lithium battery (usually a 6V lithium battery, which is approximately twice the size).

The present invention has been made in view of these points, and an object thereof is to provide a camera which can operate at a low voltage without impairing compactness.

[0005]

In order to achieve the above object, the camera of the present invention comprises a first power supply circuit for boosting the voltage from a battery and a relatively large output current for boosting the voltage from the battery. A second power supply circuit which can be supplied and a means for connecting the first and second power supply circuits so as to secure the operation startable voltage of the second power supply circuit in the first power supply circuit are provided. It has a feature.

[0006]

According to this structure, the first power supply circuit can start operating so that the second power supply circuit having a large current capacity can stably start operating even when the input voltage becomes low. Secure a proper voltage. For example, if the output voltage 3V of the second power supply circuit is secured by the first power supply circuit, the second power supply circuit starts operation (starts boosting) even when the input voltage (battery voltage) is lower than 3V (for example, 1.5V). )It can be performed.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B show a schematic configuration of the entire camera of this embodiment. FIG. 1A is a plan view and FIG. 1B is a front view. This camera has a camera body 1 and a camera body 1.
The photographic lens 2 is detachably attached to the lens mount 1A.

Reference numeral 10 is a release button for performing a photographing operation. Reference numeral 11 denotes a screen size switching key for switching between shooting with a normal screen size (full size mode) and shooting with a half screen size obtained by cutting the upper and lower sides of the normal screen size (panorama size mode). The 12 key will be described in detail later, but the screen size switching key 11
This is a PF mode switching key that determines whether or not to set a mode for controlling the zoom of the lens (hereinafter referred to as "PF mode") so that the vertical angle of view does not change even when the full size and panoramic size are switched with. Reference numeral 13 denotes a multiple exposure switching key for switching whether or not multiple exposure is performed. 1
Reference numeral 4 is a drive mode switching key for switching whether or not the release is continuously possible when the release button is continuously pressed. 15 is the main switch of this camera, ON
The camera becomes operable when set to the position. Reference numeral 16 is a body display unit that displays various operation modes, film counts, and the like. FIG. 12A shows all symbols displayed on the body display unit 16. However, not all symbols are actually displayed at the same time. The number displayed in the segment display indicates the film counter value.

FIG. 4 is a block diagram around the control circuit section. In FIG. 4, reference numeral 100 denotes a CPU for controlling the operation of the camera, which controls the operation of each device in the camera body 1 and the entire camera system, and various switches (S).
W) SM, S1, S2, SFP, SPFM, SSC and SME status signals are input. S1 is a photometric switch that is closed by pressing down the first stroke of the release button 10 (FIG. 1). When the photometric switch S1 is closed, the photometric operation and the distance measuring operation are started. S2 is a release switch that is closed by pressing down the second stroke of the release button 10 beyond the first stroke. When the release switch S2 is closed, the actual photographing operation is started. SM, S1 and S2, SFP, SPF
M, SSC and SME are respectively the main switch 15, the release button 10, the screen size switching key 11 and the PF.
This is a switch that is turned on / off by a mode switching key 12, a drive mode switching key 14 and a multiple exposure switching key 13.

A photometric circuit 107 photometrically measures the brightness of the object guided by the lens 2 (FIG. 1 (a)), and outputs the measured data as CP.
Output to U100. The distance measuring circuit 108 mainly includes a light receiving sensor array (for example, CCD) for focus detection, and outputs a light receiving signal for detecting a deviation from the in-focus position of the photographing lens 2 to the subject to the CPU 100.

In FIG. 3 showing a block diagram around the power supply system,
The drive circuit unit 34 includes a shutter drive unit 110, a film drive unit 111, and a mechanical charge mechanism unit as shown in FIG.
(Shutter, mirror, aperture charge mechanism) 112, release mechanism 113 and screen size switching drive unit 114. The control circuit unit 33 in FIG. 3 is the CP in FIG.
Equivalent to U100. In the power supply system of this embodiment, two power supply circuits of different types, that is, a first power supply circuit 31 and a second power supply circuit 32 are used to boost the voltage of the battery 30.

As shown in FIG. 17, the first power supply circuit 31 has four
Switches SW1 to SW4 and two capacitors C1
Use C2 to double the input voltage (5V in the figure) (10
V) and output. That is, in the first power supply circuit 31, since the switches S ₁ and S ₃ are closed at time t ₀ , the capacitor C ₁ is charged to 5V, and at the next time t ₁ , C _{2 is changed} to C ₁ at C ₂ . Since electric charge is given, C ₂ is charged. Since the charge of C ₁ has decreased, the charge is stored again in C ₁ at time t ₂ . In this way, the capacitors C ₁ and C ₂ are charged while switching the switches and these capacitors are connected in series, so that + 5V twice the +
A voltage of 10V is generated. This first power supply circuit 31
Cannot supply a large output current, but can output a sufficiently high voltage even with a low input voltage.

Next, the second power supply circuit 32 is composed of a chopper type switching regulator as shown in FIG. 16. In this structure, the N-channel MOS transistor Tr.1 is completely off. Then, the value obtained by subtracting the voltage drop due to the coil L and the diode D from the input voltage Vin becomes the output voltage Vout. Here, when the transistor Tr.1 is turned on only for the period of the pulse P and is rapidly turned off, the voltage VL is generated across the coil L due to the energy stored in the coil L during the period P. Therefore, the peak value of the voltage generated at the point (a) when the transistor Tr.1 is turned off is Vin + VL, this voltage is stored in the output capacitor C via D, and Vin≤Vout.
A boosted output voltage Vout is obtained. The power supply circuit 32 is provided with a control circuit 32A for controlling the ON / OFF frequency (hence the pulse P) of the transistor Tr.1 according to the output voltage in order to keep the output voltage Vout constant. Input voltage is lower than 3V (eg 1.
Even if it becomes 5V), if the output voltage is 3V, the control circuit 32A operates normally and the second power supply circuit 32 can be started. Conversely, if the input voltage or the output voltage is not higher than a predetermined value (3V) at the time of starting the operation, the operation cannot be started.
The second power supply circuit 32 can supply a large output current.

By the way, a high-performance microcomputer (high-speed operation) is used as the CPU 100 in order to realize a high-function camera (multi-element autofocus, high-speed operation, complex zoom operation such as power zoom, fuzzy control). , The current consumption increases. Further, in pursuit of miniaturization, it becomes necessary to design a circuit system with a 3V lithium battery (usually a 6V lithium battery, which is approximately twice the size).

In order to operate the above-mentioned high-performance microcomputer, it is necessary to operate the second power supply circuit 32 which can secure sufficient current consumption and voltage. However, as described above, the second power supply circuit 32 has an input voltage of 3 V or more or an output voltage of 3 V or more as the condition for starting the operation (at this time, the input voltage may drop to about 1.5 V). is necessary. Therefore, in this embodiment, the securing of the output voltage of 3 V is realized by using the first power supply circuit 31.

That is, the second power supply circuit 3 having a large current capacity.
2 is an output voltage at which the second power supply circuit 32 can start operating so that stable operation can be started (boost start) even when the input voltage (battery voltage) becomes lower than 3V. It secures 3V.

When high-speed arithmetic processing is not necessary (during standby, etc.), the microcomputer is made to operate at a low speed. At this time, since the current consumption is small, the highly efficient first power supply circuit 31 is used. Operate the computer. At this time, although the current consumption is large, the inefficient second power supply circuit 32 stops its operation.

At the time of start-up that requires high-speed arithmetic processing, the operation of the second power supply circuit 32 is started to operate the microcomputer at high speed. Once the second power supply circuit 32 operates, stable operation is possible even if the first power supply circuit 31 is stopped (at this time, the second power supply circuit 32 can operate even if the input voltage drops). is there). However, in this embodiment, as can be seen from the flowchart of FIG. 5 described below, the operation of the first power supply circuit 31 is not stopped even when the second power supply circuit 32 is operating.

Returning to FIG. 4, the shutter drive section 110.
Drives the shutter curtain under the control of CPU100,
Give the film surface a proper exposure time TVC. The film drive unit 111 winds and rewinds the film under the control of the CPU 100. Mechanical charge mechanism section 112
Performs mechanical charging of a shutter, a mirror, and an aperture under the control of the CPU 100. The release mechanism 113 is C
Under the control of the PU 100, the mirror up / down and the lens diaphragm are controlled. Screen size switching drive unit 114
Under the control of the CPU 100, as shown in FIG. 2, the panorama shading members 21A, 2 that can move forward and backward in the shooting image frame 20b.
Shutter opening 20 by taking in and out 1B
By changing the size of a, the size of the photographing screen can be switched to the full size screen (FIG. 2A) or the panoramic screen (FIG. 2B).

In FIG. 4, reference numeral 200 denotes a lens circuit in the taking lens 2, which exchanges lens data, zoom control data and the like with the CPU 100.

Now, the operation after the power supply is attached will be described with reference to the flowchart of FIG. After mounting the battery, first, the first power supply circuit 31 is operated (# 0). The capacitor 130a of the power-on reset circuit 130 shown in FIG. 4 is charged, and the voltage across the capacitor 130a rises, so that the CPU 10
0, the internal system reset unit 101 is reset, and the clock selection unit 102 sets the low-speed clock oscillation unit 105.
To supply the system clock to the CPU 100. In FIG. 4, 103 is an internal system clock generator, and 120 is internal software.

When the CPU 100 is reset and the system clock is supplied, first the internal registers (accumulator, stack pointer, etc.) are initialized (reset).
(# 1), the operation of the second power supply circuit 32 (FIG. 3) is started (# 2), and the control circuit section 33 receives 5 V
Supply V. Next, the clock selection unit 102 is switched to the high-speed clock oscillation unit 104 to operate the CPU 100 in the high-speed mode (# 3), the variables in the RAM area in the CPU 100 are initialized (# 4), and the lens 2 (see FIG. Various data such as lens data is read from the circuit 200 in (d))
(# 5).

Next, the main switch 15 (FIG. 1A) is checked (# 6). Main switch 15 is LOCK
In the position (switch SM is open), clock selection unit 1
02 is switched to the low-speed clock oscillation unit 105 and the CPU 1
00 in the low speed mode (# 7), and the second power supply circuit 3
The operation of No. 2 is stopped (# 8), and the power supply to only the first power supply circuit 31 is switched to suppress the consumption of the battery. Then, the operations of steps # 6 to # 8 are repeated, and the main switch 15
Wait until is in the ON position.

When the main switch 15 is in the ON position,
The second power supply circuit 32 (FIG. 3) is started (if it is originally operating, it is kept as it is) (# 9), and the clock selection unit 102 (FIG. 4) is switched to the high-speed clock oscillation unit 104 to switch the CPU 100. Operate in high speed mode (# 10),
Check the status of various switches (# 11). When the main switch is changed from ON to LOCK, the operation proceeds to step # 7. When any switch other than the main switch is operated, start the second power supply circuit 32 (if it is originally operating, leave it as it is).
(# 15), the clock selecting unit 102 is switched to the high-speed clock oscillating unit 104 to operate the CPU 100 in the high-speed mode (# 16), and the processing operation according to various switches to be described in detail later is performed (# 17). Returns to the check operation (# 11) of various switches.

If there is no switch operation in the check of various switches (# 11), it is determined in step # 12 whether or not a predetermined time or more has elapsed since the previous switch operation or the end of the processing operation by the various switches. To judge. Then, if it is within the predetermined time, check operation of various switches
Returning to (# 11), when there is no switch operation for a predetermined time or more, the clock selection unit 102 is set to the low-speed clock oscillation unit 105.
To operate the CPU 100 in low speed mode (
13), stop the operation of the second power supply circuit 32 (# 14),
Switch to power supply only by the first power supply circuit 31 to suppress battery consumption and check operation of various switches (# 1
Return to 1).

Next, the processing operation (#
17) will be described based on the flowchart of FIG. First, it is determined whether or not the shutter release button 10 has been depressed by one step and the switch S1 has been turned on (#
20), if it is ON, move to S1ON processing (# 21) described later. If the switch S1 is not ON, it is judged whether or not the screen size switching key 11 is ON (# 22). If this key 11 is ON, the screen switching process between panorama and full size described later (# 23). Move on to. Key 1 in step # 22
If 1 is OFF, it is determined whether the PF mode switching key 12 is ON (# 24), and if it is ON, the process proceeds to PF mode switching processing (# 25) described later. However, if it is OFF, it is determined whether or not the drive mode switching key 14 is ON (# 26), and if the key 14 is ON, the process shifts to single shooting and continuous shooting (# 27) described later. Key 14 is OF
If it is F, it is determined whether or not the multiple exposure switching key 13 is in the ON state (# 28), and if the key 13 is ON, the process proceeds to the exposure mode switching process (# 29) described later. When the above processes are completed, the process returns to the various switch checks (# 11) in FIG. 5 to execute the operations after step # 11.

Next, the exposure mode switching process (# 29) shown in the flowchart of FIG. 6 will be described with reference to the flowchart of FIG. First, it is determined whether or not the current exposure mode is the multiple exposure mode (# 120), and if it is not the multiple exposure mode (ME.F = 0), the multiple exposure mode is set in step # 121 (ME.F ← 1. ), And displays the multiple exposure mode (# 1
22), and proceeds to step # 128. If the multiple exposure mode is set in step # 120 (ME.F = 1), the multiple exposure mode is canceled in step # 123 (ME.F ← 0), and the display indicating the multiple exposure mode is erased (# 124). Then, it is determined whether or not multiple exposure is in progress (# 125). If multiple exposure is not in progress (N = 0), the process proceeds to step # 128. If multiple exposure is in progress (N> 0), then in step # 126. The number of exposures is reset (N ← 0), the film is wound up one frame (# 127), and the process proceeds to step # 128. In step # 128, the multiple-exposure switching key 13 is O
Wait until FF.

Next, the switching process (# 27) between single shooting and continuous shooting shown in the flowchart of FIG. 6 will be described with reference to the flowchart of FIG. When this routine is called, it is first determined whether or not the current drive mode is continuous shooting (# 110), and if it is single shooting mode (DRIVE.F = 0), continuous shooting is performed in step # 111. Set to (DRIV
EF ← 1), the continuous shooting mode is displayed (# 112), and the process proceeds to step # 115. In continuous shooting mode (DRIVE.F = 1),
In step # 113, set the drive mode to single shot (DRI
VE.F ← 0), the single shooting mode is displayed (# 114), and the process proceeds to step # 115. In step # 115, the process waits until the drive mode switching key 14 is turned off.

Next, regarding the screen switching process (# 23) between panorama and full size shown in the flowchart of FIG.
This will be described with reference to the flowchart of FIG. First, it is determined whether or not the multiple exposure is currently being performed (# 70). If the multiple exposure is being performed (N> 0), the screen size cannot be switched, so the process proceeds to step # 82. If multiple exposure is not in progress (N = 0), the current screen size is determined (# 71).

When the current screen is full size,
(PANORAMA.F = 0), change to the panorama size by the screen size switching drive unit 114 (FIG. 4) (# 72), and step # 73
To set the panorama mode (PANORAMA.F ← 1). next,
It is determined whether or not the shooting angle of view does not change even if the screen size is switched (# 74), and when the PF mode is selected (PF.
F = 1), the panorama designation display of the PF mode of FIG. 12E is performed (# 75), and otherwise, the panorama setting display of FIG. 12C is performed (# 76). Then, the process proceeds to step # 82.

When the current screen is the panorama size in step # 71 (PANORAMA.F = 1), the screen size switching drive unit 114 changes the size to full size (# 77), and the panorama mode is released in step # 78. (PANORAMA.F ←
0). Then, it is determined whether the PF mode is set (# 79), and the PF is set.
When the mode is set (PF.F = 1), the full size designation display of the PF mode of FIG. 12 (d) is displayed (# 80), otherwise the full size setting display of FIG. 12 (b) is displayed. (# 76). Then, the process proceeds to step # 82. In step # 82, PF
Wait until the mode switch key turns off.

Next, the PF shown in the flowchart of FIG.
The mode switching process (# 25) will be described with reference to the flowchart of FIG. First, determine whether the PF mode
(# 90), if in PF mode (PF.F = 1), step # 9
The PF mode is released with 1 (PF.F ← 0). After that, the current screen size is judged (# 92), and if it is full size (P92
ANORAMA.F = 0), full size setting display of Fig. 12 (b) is displayed (# 93), and panorama size is (PANORAMA.F = 1),
The panorama size setting display of FIG. 12C is performed (# 94).
Then, the process proceeds to step # 105.

When it is determined in step # 90 that the PF mode is not set (PF.F = 0), the PF mode is set in step # 95 (PF.F ← 1) and the current screen size is determined. (# 96). When the current screen is full size, (PAN
ORAMA.F = 0), full size designation display of the PF mode of FIG. 12D is performed (# 97), and the limit value of the focal length on the wide angle side is calculated in step # 98 (Z'fw). Then, the current focal length (Zf) of the lens is compared with the limit value (Z'fw) (# 99),
When Zf <Z'fw, the lens zoom is controlled so that the focal length of the lens becomes Z'fw (# 100), and step # 10
Go to step 5, and if Zf <Z'fw is not true, go directly to step # 105.
Move on to.

When it is determined in step # 96 that the screen has the panorama size (PANORAMA.F = 1), P in FIG.
Perform panorama size designation display in F mode (# 101),
In step # 102, the limit value of the focal length on the telephoto side is calculated (Z'ft). Then, the current focal length (Zf) of the lens is compared with the limit value (Z'fw) (# 103), and when Zf>Z'ft, the lens focal length becomes Z'ft. Control the zoom of (# 104), move to step # 105, Zf>Z'f
If not t, the process directly moves to step # 105. At step # 105, the process is terminated after the PF mode changeover switch 12 is turned off.

Here, a concrete example will be described with reference to FIG.
For example, as shown in FIGS. 14A and 15A, if the mode is switched to the panorama size mode while the image is properly captured in the full size mode, the flow proceeds from step # 90 to step # 95. At this time, as can be seen from FIG. 14 (d), the angle of view becomes small (αF → αP), and if the image is taken with the focal length as it is, the size of the image does not change on the film surface as shown in FIG. 14 (b). , When printed
It becomes like (b). So, step # 96,
When the focal length is changed by the routines # 101, # 102, # 103, and # 104 so that the vertical screen angle of view (α) does not change as shown in FIG.
The size is as shown in (c), and when printing is performed, appropriate photographing can be performed as shown in FIG. 15 (c).

That is, when the panorama size mode and the full size mode are switched, the lens is zoomed so that the upper and lower angles of view do not change during switching, and the zoom range of the lens in the PF mode is restricted. By doing so, even if the photographer makes an erroneous operation, the image is properly photographed.

The relationship between the focal lengths of the full size mode and the panorama size mode at this time satisfies the following expression (1), as is apparent from FIG. 15 (d). fF / fP = 12 / 6.5 (1) where, fF: focal length in full size mode fP: focal length in panorama mode.

The focal length by switching between the panorama size mode and the full size mode shown in FIG. 13 will be examined with a zoom lens having a focal length of 24 to 70 mm based on the relationship with the vertical angle of view. The wide-angle limit value Z'fw in size mode is expressed as Z'fw = fmin x 12 ÷ 6.5 = 24 x 12 ÷ 6.5 ≈ 44 (point C in Fig. 13), and the telephoto side limit value Z'ft in panorama mode is Is expressed by Z'ft = fmax × 6.5 ÷ 12 = 70 × 6.5 ÷ 12≈38 (point B in FIG. 13). Here, fmin: Limit value on the wide-angle side of the lens fmax: Limit value on the telephoto side of the lens.

Therefore, the range in which the focal length changes in the PF mode is as follows for each screen size. 44 ~ 70mm ...... Full size mode 28 ~ 38mm ...... Panorama mode

Focal length 70mm in full size mode (Fig. 13
When the screen is switched to panorama mode at point D), the focal length becomes 38 mm (point B in FIG. 13), and when the focal length is 24 mm in panorama mode (point A in FIG. 13), the screen becomes full size mode. The focal length is changed to 44 mm (Fig. 13
Point C).

The S1ON process (# 21) shown in the flowchart of FIG. 6 will be described with reference to the flowchart of FIG. First, when the shutter release button 10 is pressed and the switch S1 is turned on, data such as the focal length is input from the lens 2 (# 40) and the distance measurement data is input from the distance measuring circuit 108 (# 41). Calculate the defocus amount from the data (# 42), drive the movable lens of the lens (# 43),
Focus and focus display on the finder display unit 106
(# 44). Next, the photometric data is input from the photometric circuit 107 (# 45), the film sensitivity is input from the film sensitivity reading unit 109 (# 46), and the exposure value EV is obtained from both data.
Is calculated (# 47), and the exposure control value A
VC and TVC are calculated (# 48).

Next, it is determined whether or not the switch S2 is ON (# 49). If it is OFF, the process goes to step # 11 of the flow chart of FIG. 5 to check various switches. When it is ON, it is judged whether the TVC is long time.
(# 50), Interruption processing is possible so that the exposure at a long time can be released during the determination at the long time, and a specific switch (for example, the main switch) can be accepted. (# 51). Then, the release mechanism 113 is controlled to raise the mirror, and the lens is narrowed down according to the exposure control value AVC. Next, the shutter drive unit 110 is controlled to give an exposure time according to the exposure control value TVC to the film surface, and then the mechanical charge mechanism 112 is controlled.
The mirror is lowered and the shutter, mirror, and diaphragm are mechanically charged. This series of shutter release control is performed in step # 52. Next, the interrupt processing permitted in step # 51 is prohibited (# 53). Next, it is judged whether or not the multiple exposure mode is set (# 54).
(EF = 1), the number of exposures is incremented in step # 55, and then the process proceeds to step # 56. When the multiple exposure mode is not set (ME.F = 0), the process proceeds to step # 58. Next, it is determined whether or not the number of exposures reaches a predetermined number of exposures (# 56),
If it does not reach the predetermined number of times, the process proceeds to step # 59. When the predetermined number of times is reached, in step # 57, the exposure number is reset (N ← 0), the film is wound up one frame, the film count is incremented by 1 and displayed on the body display unit 16 (# 5
8) Go to step # 59.

In step # 59, it is determined whether or not the single-shot mode is set. In the single-shot mode, the shutter release switch S2 is set.
Wait until it turns off (# 60). Then, the focus display is turned off (# 61), and the process goes to step # 11 of FIG.

As described above, in this embodiment, in the camera capable of switching the screen size between the full size and the panorama size, the switching of the screen size is prohibited during the following operations ([1] to [3]). ..

[1] During multiple exposure As is apparent from step # 70 in the flowchart of FIG. 8, the screen size cannot be switched during multiple exposure.

[2] During long-time exposure During exposure, the screen size cannot be switched because it is operating at step # 52 in the flowchart of FIG.

[3] During Continuous Shooting As is apparent from the flowchart of FIG. 6, during continuous shooting, the step of checking the screen changeover switch in step # 22 does not proceed.

[0048]

As described above, the camera operable at a low voltage according to the present invention loses its compactness by ensuring the voltage at which the operation of the second power supply circuit can be started by the first power supply circuit. It is possible to realize a camera that can operate at a low voltage. Therefore, it is possible to use a 3V
It is possible to realize a camera system with the same level of battery life using system batteries.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an entire embodiment of the present invention.

FIG. 2 is a diagram for explaining a shooting screen switching mechanism in the embodiment of the present invention.

FIG. 3 is a block diagram showing a schematic configuration around a power supply system according to an embodiment of the present invention.

FIG. 4 is a block diagram showing a schematic configuration around a control circuit unit according to an embodiment of the present invention.

FIG. 5 is a flowchart showing a main routine of control operation according to the embodiment of the present invention.

FIG. 6 is a flowchart showing a subroutine of processing operation according to various switches in the embodiment of the present invention.

7 is a flowchart showing a subroutine of S1ON processing in the flowchart of FIG.

8 is a flowchart showing a subroutine of a screen switching process between panorama size and full size in the flowchart of FIG.

9 is a flowchart showing a subroutine of PF mode switching processing in the flowchart of FIG.

10 is a flowchart showing a subroutine of a switching process between single shooting and continuous shooting in the flowchart of FIG.

11 is a flowchart showing a subroutine of exposure mode switching processing in the flowchart of FIG.

FIG. 12 is a diagram showing a display displayed on the body display unit according to the embodiment of the present invention.

FIG. 13 is a diagram for explaining switching between the panorama size mode and the full size mode in a state where the vertical angle of view is kept the same in the embodiment of the present invention.

FIG. 14 is a diagram for explaining the size of an image on a film when switching shooting modes according to an embodiment of the present invention.

FIG. 15 is a diagram for explaining the size of an image with respect to a print when switching the shooting modes according to the embodiment of the present invention.

FIG. 16 is a diagram showing an example of a basic circuit configuration of a boosting operation of a CPU applied to an embodiment of the present invention.

FIG. 17 is a diagram for explaining an example of a circuit configuration of a CPU applied to the embodiment of the present invention.

[Explanation of symbols]

 10 ... Release button 11 ... Screen size switching key 12 ... PF mode switching key 13 ... Multiple exposure switching key 14 ... Drive mode switching key 15 ... Main switch 16 ... Body display 20a ... Shutter opening 20b ... Shooting frame 21A, 21B ... Light-shielding member for panorama

Claims (1)

[Claims] 1. A first power supply circuit that boosts a voltage from a battery, a second power supply circuit that boosts a voltage from the battery and can supply a relatively large output current, and a second power supply circuit. A means for connecting the first and second power supply circuits so as to secure an operation startable voltage in the first power supply circuit.