JPS59149335A - Power supply device of camera - Google Patents

Abstract

PURPOSE:To prevent wasteful power consumption due to erroneous operation when a film is not loaded, by stopping the power supply in accordance with the output signal of a means which detects whether the film is present or not in the camera. CONSTITUTION:A gate circuit 112 consists of analog switches 224, 226, 228, 230, and 232 connected to an idle feeding control circuit 214, a constant voltage control circuit 216, a winding control circuit 218, a converter control circuit 220, and a rewinding control circuit 222, an analog switch 234 connected to analog switches 226, 228, 230, and 232, and an analog switch 236 connected between the positive-pole terminal of a battery 210 and analog switches 224 and 234. The analog switch 236 is controlled by the output of a film detector, and this switch is turned on when the film is loaded in the camera. Consequently, if the film is not loaded in the camera, power is not supplied to control circuits 214, 216, 218, 220, and 222 because the analog switch 236 is turned off, and wasteful consumption of the power source is prevented even if a release button is depressed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply device for a camera.
Power supplies for cameras with heavy power loads such as iJIC (Related to 1).

In recent years, cameras have become increasingly popular, and cameras that automatically perform everything from exposure control to film winding have been developed. Usually, cameras like this have a built-in strobe, and the strobe charge is +4! It is carried out in a typical manner. The motor for film winding rotates in response to completion of the shutter operation (1), and the light weight of the strobe is activated in response to completion of film winding (1).Therefore, even if there is no film in the camera, the release button can be pressed. When is pressed, the shutter operates and the motor rotates automatically.
1. Ru.

Here, if the main switch of the strobe is closed, the strobe will fire and then be recharged. In this way, the conventional 4+11 camera (=) has a large power load, so if no film is loaded, there is a risk of power being wasted due to incorrect operation.In general, the power supply of the camera is Since it uses batteries, and moreover, small and scary batteries, there is no need for unnecessary power consumption.

This invention is based on the above-mentioned 1. This was designed to deal with the situation where the film was not loaded (from 2).
The purpose is to provide a power supply device for a camera that prevents the power from being wasted.

Hereinafter, an embodiment of a power supply device for a camera according to the present invention will be described with reference to the drawings. First, this embodiment will be schematically described with reference to FIG.

71): The positive terminal of the battery 21θ as a source passes through the gate circuit 212 to the idle feed control II circuit 214, the constant voltage +1H control circuit 276, the winding split section 1 circuit 21B, the converter system circuit 220, and the rewinding circuit. It is connected to the control circuit 222 . Gate circuit? 12 is a control circuit 214,2
16, 218, 220, 222 L2 connected analog switches 224, 226° 228, 2, respectively
,? 0, 2,? 2 and analog switch 2
Analog switch 2 connected to 26°228, 230, 2.72, ? 4, and an analog switch 236 connected between the positive terminal of the battery 210 and the analog switches 224 and 234. The analog switch 236 controls the output of the film detector (described later) (6[11], and is activated when film is loaded in the camera. Analog switches 224 and 23
4 is a series of Φ 1 on the rear lid of the camera, analog switch 2
24 is turned on momentarily at 6 and 7 when the rear lid changes from opening to closing, and analog switch 234 is turned on during the song when the rear lid is closed. The analog switches 226 and 228 are linked to the release button (2), and the analog switch 226 is on while the release button is pressed in, and when the analog switch 228 returns from the pressed state to the original state (1), it turns on (N) The analog switch 230 is turned on momentarily when the main switch of the strobe is closed, and when the main switch is closed, it is turned on momentarily when the film winding is completed.
When the rewind switch is closed (knee [1 meter C is turned on).

A blank feed control circuit 214 supplies a blank feed signal to a film winding motor circuit 238. Film winding (
The two interlocking switches 240 are the idle feed control circuit 21g,
Winding control circuit 2rs+=connected. switch 2 0
is closed when the motor (2) is finished winding the film frame, and outputs a winding completion signal.
:, the output of the control circuit 216 is constant voltage 1,000 times h'g2iz
+2 supplied. The circuit 242 supplies a constant current to the exposure control circuit 2 and 4. Winding system? 1
The circuit 111 and the circuit 218 supply a normal rotation signal to the motor circuit 238 . The convergence control circuit 220 is the strobe circuit 2
46. Strobe circuit 246
When the main capacitor is charged to a predetermined electric field, the completed double charge is supplied to the converter control circuit 220, 7-ro8 rewind, and the control circuit 222 is connected to the motor circuit 23.
8. Supply the 1ψ-transformed irises to 8.

According to this configuration, if no film is loaded in the camera, the analog switch 236 is off, so that the control circuits 214, 216, 218, 220, .
222 is not supplied with power, and even if the release button is pressed, the power is not consumed silently.

When a film is loaded, each control circuit operates in the following 11-order sequence only when the film is loaded. When the camera (NiFilm is loaded and the rear lid is closed), the +++ circuit 214 is connected to the -instantaneous power supply 21O (= connected to
). Free feed system 1fllJ circuit 214 1. In response to C1, a blank feed signal is sent to the motor circuit 238 (forward rotation 461 inches)
supply. The blank feed signal continues to be supplied to the motor circuit 238 until the film winding switch 240 is opened three times, i.e. until the film has been wound three frames. Three frames of film are shown. When the rear lid is in the closed state, the analog switch 234 is in the on state. When the strobe main switch is closed, analog switch 230 is pulled-on and converter control circuit 220 supplies a charging signal to strobe circuit 246. Strobe circuit 2
46 boosts the voltage of the power source and charges the main capacitor. When the main condenser → J- is charged to the predetermined pressure, the strobe turns i+! 82#6 supplies the completed signal to the converter control circuit 22θ.\\. Converter control circuit 22
0 is this completion signal (=Therefore, operation is stopped 1~, charging to the main capacitor is accompanied. As a result, charging to the main capacitor is performed only for the minimum necessary period, and wasteful power consumption is avoided. Prevented.

Shooting (1) When the release button is pressed, analog switch 226 h-on L7, fixed 'city system Tsukuda circuit 2I6
(2 power supplies are supplied. From this (2), the fixed market output circuit 24
2 is activated and supplies constant voltage 1 to the exposure control circuit 244. The exposure control circuit 244 is normally made into a C type and is operated by this constant voltage. The shutter and diaphragm are turned on, and the deepest shadow appears at a suitable angle. If the subject's light Y6 is a little weak, use a strobe.
) will be photographed.

The release button remains depressed during shutter operation.

When the shutter operation is completed, the analog switch 22s is turned on at 11 degrees in synchronization with the release button. This causes the hoisting control circuit 228 to
8. A normal rotation signal is supplied to 12, and the film is wound.

When one film is partially wound, the switch 240
The hoisting control circuit 27 is closed and hoisting is completed.
8 C supplied. When the main switch is closed, the winding completion signal (2) is synchronized with the analog switch 2.
30 turns on -IR, and charging to the main capacitor is stopped. KOσ）Yo C2, Hui! When the REM is loaded, when the release button is pressed, the self! The main capacitor for shooting, film winding, and strobe photography can be charged automatically! l! 71.

Here, charging to the main capacitor is completed after film winding 1. (2) and not simultaneously (2). This is because both operations have a fairly large power load, so simultaneous (2) is not performed.
This is because if the process is repeated once, the battery power is consumed considerably.

When the shooting of the specified number of frames is completed and the rewind switch is closed, the rewind control circuit 222 is activated, the motor is rotated in the reverse direction, and the film is rewound. When the film is fully wound up in the Patot Corner, the film becomes unloaded, etc. t7
(2) The analog switch 236 is turned off and all camera operations are stopped.
, is not consumed. In this way (2), in this one major example, the supply of power is controlled depending on the amount of film in the camera, so that power is not wasted unnecessarily.

Next, this embodiment will be explained in detail. FIGS. 2 to 4 show the gate circuit 212, each control circuit 21d, 216
, 218, 220, 222.

Figure 2, ゛Figure 3 I! Hereinafter, the =ii paths will be referred to as the first and second power supply systems, respectively. FIG. 4 shows a circuit that supplies control signals to each gate t in FIGS. 2 and 3. In FIG.

ηZ The first power supply system shown in Figure 2 is the only one when the film detection switch (hereinafter referred to as the K switch) is off (open).
The first power supply system shown in the figure operates only under certain conditions. The K switch is configured as shown in FIG. Ru. 51st Tue 1(a) is a rear view of the camera with the rear lid open. On the main body 25θ side, an IL:, plate rail 252, film rail 254, sprocket 256, spool 258, and switch contact piece 260 are provided.

1 switch contact piece 260 is connected to film rail 254 and I
The middle of the upper plate rail 252 (two are provided. The rear lid 26
The second side is provided with an IL plate 261a and an I (the other contact piece 266 of the switch) protruding from a notch 6 provided in a part of the pressure plate 264 at a position corresponding to the switch contact piece 260. (bl, fcl are the same figure (■ in al).

The cross-sectional structure taken along the I' line (2) is shown; (b) shows the case with the film (1), and (C) shows the case without the film.

As shown in Figure (b)-2, when C2 and film 268 are present, there is no interlayer between both contact pieces 260 and 266, so the K switch is turned off, and as shown in Figure (cl-2), the film 268 is If there is no contact piece 260, 266, the K switch will be on (open) because both contact pieces 260, 266 will be in contact with each other.

B'', S p', T I', F' in Fig. 2,
T,? ' As shown in FIG. 4, control signals are sent to each switch B, Sp.

T7, F, T, q states (generated according to 1. Here, the B switch is a switch that is turned on by closing the rear lid, the Sp switch is a release switch, the Tl switch is a winding start switch, The F switch is the main switch of the strobe, and the i'3 switch is the rewind switch.The Sp switch and TI switch are the release button (2). Turns on when returning.F switch and 1゛3 switch are manual switches.K
When the switch is on, transistor Q51. Q.5
2°Q96 is the cutoff. transistor Q,
96 collector (M?132's first power supply system)
It is a source of supply information. For this reason, the first
The electric power Δ13i system does not operate when the K switch is on, that is, when there is no film, to prevent wasteful consumption of electric power.

When the R switch is turned off f2 from the film arrangement u+iL2, the transistor t,
sz, Q, 52°Q96 base-emitter junction (=current flows, transistor Q, 5 J, Q52,
Q96 turns on 1, transistor Q9G turns on, the first ? Strain to mi'1llll (Figure 2)
1+'A is supplied to the 1st power supply system.
Start. Transistors Q51, Q, 52 are turned on (from the second, transistors Qris, Q3!?, c
a5° is on 12, then transistor Q, 3. ?
, Q...? Gu.

Q3.5, Q53. Q54. 'Q55. Q56. I turn on Mehachi.

Furthermore, the transistors g2s, q i y, Q
7. Q.5B.

Q, 2 9, Q,? o, Q
Gt, Qis, Q3), Q,”
12. Q, 59 is turned on, switches B, F,
8p, TI, T,? +/)l(j) It is now possible to create.

The B switch and F switch are off when the stone is on the power supply VCCCC side, and on when they are on the ground side.

13.F When the switch is off, the transistor Q remains
z6. Qxy, cuo, Q2I, Q2;? , Q22. Q
2#.

Q25 turns on. When transistor Q2 is turned on, transistor Q27 is also turned on, so transistor Q2B is cut off. Therefore, B', F
' The signal becomes vCC level. Reverse (2 B, 1
．． 1 As long as the switch is on, the transistor Q26
is the cutoff, so the transistor Q2. ? ,
Q22. Q2zu, Q25. Q“21.Q20゜Q19
Also turns off. When the transistor Q24 is turned off (secondarily, the transistor Q27 is also turned off, so the l transistor Q2B is turned on. Therefore, the B' and F' signals are at the ground level.

Sp, T7. T, 9 When the switch is off, the transistor Q (, ? is on and Q7 is off, so Sp', TI'
,T,? 'The signal becomes double the VCC level. Sp, TI, T
, y switch is on, transistor Q13 is cut off and Qg7 is on, so Sp', T
The I' and T3' signals are at ground level. in this way,
Each control signal is switched from OFF to ON (from 2, ■C
Changes from C level to ground level.

In the first power supply system shown in FIG. 2, each control Wllll signal from FIG. 4 changes from V CC (positive) level to ground (negative) level (if it changes by 1, NANI).
25. ,'? 4 outputs a negative pulse of the predetermined pulse 11t4. When the film is loaded and the rear lid is closed, when the level of the signal B' changes from negative to negative, the capacitor C2 is
N i) The output of gate 5 becomes negative level. This ('J Pal Pal (2 therefore NAND gate 12,
7,? A flip-flop consisting of is set, ,
The output of the NAND gate 13 is at a negative level (2).

Therefore, a blank feed bold signal is output from the impark 5I. The bold signal is an IF signal for operating each control circuit. Below, each signal is city logic and 1. I will explain. Konoto Nagai NA,'N T) Gate 49
Since the output of @2 power supply system (3rd
(Fig.) becomes operational. The negative pulse output from the N and AND gate 5 causes the NAND gate 9 and IO to output a timer reset pulse and a film counter reset pulse, respectively.

These reset pulses reset the flip-flops 87-99, 59, 60, 6.9, and 64 in FIG. 3. A timer 28.theta., which is made up of flip-flops 87-99, counts the output signal of the oscillation 4282. R,
The oscillator 2B'2 oscillates at a frequency determined by the capacitor 1-C6 and the resistor R2. Due to the idle feed hold signal, the output of the NAND gate 71 becomes a positive level, and the inverter 78 outputs an IE inversion signal. this is,
This is the idle feed signal in FIG.

Motor circuit 2. ? A detailed circuit diagram of 8 is shown in FIG. 6C. In response to the normal rotation signal, transistors Q60°Q61. Q6
7 is off. Current flows from the L1 positive pole inductor ('→) to the negative pole terminal (c), and the motor M rotates in the normal direction.

The film is wound by normal rotation of the motor M. When the film is wound one frame, the T2 switch (switch 24θ of salt 11 and 1) is closed (turned on). The T2 switch is turned off during winding. The number of times the T2 switch is turned on is counted by a blank feed counter consisting of flip-flops 63 and 64.

Flip-flop 59, 60, NANJ)
Gates 61 and 62 are circuits for preventing chattering rain. When the T2 switch is turned on three times, both the Q outputs of the Tsuritubu flops 63 and 64 become [E level, and the N A
, N I) The output of the gate 66 becomes a negative level.

This (from 2), as the forward rotation signal becomes negative level, 2,
A brake signal is output from the inverter 76. In Figure 6C2, the brake aunt (from 2, transistor Q
62, Q6.9, and Q6B are turned on, both ends of the motor M are short-circuited, and the electromagnetic brake is applied to the motor M.As a result, when the rear lid is closed, the C film is automatically turned on. Only one frame is skip-fed. At this point, the output power of the inverter 68 becomes a negative level, so the reset of the flip-flops 72 and 73 is released.After this, when a predetermined period of time has elapsed, operation L7 starts from the start of the blank-feed.
The output of the flip-flop 890 of the timer 280 causes both Q outputs of the flip-flops 72 and 73 to be at a positive level (2), and a winding reset signal is output from the inverter 8o. NA of
Ni) The output of the gate 8 becomes a positive level, and the flip-flops 72 and l3 are reset. NAND
Gate 1? Since the output of is at the city level, NA, N
The output of D Agate 9 becomes its own level, and the second power supply system (
(Fig. 3) is accompanied.

For this reason, the amount of brake applied is set to several 10 to several 100 m5cc, so that excess power is not consumed.

Also, during the dry feed operation (2. If some abnormality occurs and it takes a long time to wind up 12.3 frames, the ζ feed reset signal output from the flip-flop 98 of the timer 280 (2. 12, Z, and ? are set, and the operation of the second power supply system is terminated.As a result, when !I!JS occurs]lss it'"lG:
Power is saved. Up to this point, there have been 1191 films, from loading the film to empty-feeding the film.

The above explanation is shown in FIG. 9 (flow chart and 1.).

In this flowchart 22, the steps indicated by broken lines are 7 unique actions by the photographer, and if these actions are not performed, the flow enters a standby state at that action step.

Next, I will explain the 4υ1 works taken by I Chugu. Here, if the main switch F is on, the main capacitor of the strobe is charged. When the F switch is turned on from off, and the F' (m number changes from ■CC level to 48/ground level, the same as in the case of B switch +: kC2, NAN
J) A negative pulse is output from the gate 34 (FIG. 2). Flip 70 Tsubu 36...? 7 no I - set, N
A N l) The output of the gate 37 is at a negative level (2).

As a result of this (2), the impark 58 outputs a =1 pattern hold signal.

Koga 1. is 71! It is supplied to the strobe circuit 246 shown in Figure 1. This is the charging signal.

=L Toa Ho times! A detailed circuit diagram of N8216 is shown in Figure 7. Converter hole route number (from the second point, transistors Q9.?, Q'9θ are turned on, and T consisting of transistors Q9o, Q9i, Q9z, and transformer T)
The C-DC converter 290 starts oscillating. When the oscillation rises 1'E of this converter 290, the output power is charged to the sub capacitor C8 and the main capacitor C10.

The toxicity of the secondary capacitor C8 is much smaller than that of the main capacitor CZO. When the terminal voltage of the capacitors cs and cxo reaches 8: or more (2), the charge in the auxiliary capacitor C8 flows through the gas discharge tube XI, turning on the transistors Q99 and Q95.The main capacitor Cxo Since there is a diode FD9, the charge is not discharged.When the transistor Q and 95 are turned on, a converter reset signal (charging completion signal in Figure 1) is output.

1st power supply system (@Figure 2) (In the 2nd stage, the converter reset signal activates the flip-flops, ?6, ?6, ?
7 is reset and generation of the converter hold signal is stopped. As a result, 1) C-D C converter 29
The operation of the main capacitor C7θ is stopped and the charging of the main capacitor C7θ is completed. In other words, the main condenser→)-CtO becomes the discharge starting voltage of the gas discharge tube X7.
=Charging ends.

Where is the gas discharged? , 73
) has a small size that allows the flash discharge tube X2 to emit light when the flash discharge tube
It has been selected as one ball. In this manner, the DC-DC converter 29θ terminates its operation after charging the main capacitor C10 to a certain W current, so that power is not consumed unnecessarily.

When the release button is pressed, the Sp switch is turned on. 3
When the p J signal falls (2), flip-flops 2o and 2I (see FIG. 2) are set, and the 2' output is turned on, and the AE hold signal is output from the inverter 52. AE hold signal (From the second point, the CTL signal is output from the NAND gate 82, and the constant voltage i1'82
42 (FIG. 1).

The detailed circuit diagram of constant voltage Doma 1; Raku 242 is shown in Figure 8. When the CTL signal is supplied, a constant voltage determined by the ratio of resistors R31 and R32 is output to the output terminal Vout. This (from 2, exposed side ff) 11 circuit 244 is activated 1
7. Automatic exposure photography is performed.

Here, in the strobe circuit (Fig. 7), switch SW
1 is interlocked with main switch F. Therefore,
When the main switch F is on, 6 is linked to the shirt release, and the X contact switch SW2 is on.
, flash 1fi; tube X2 is triggered. This results in
The discharge current from the main capacitor C1θ is flashed and cooled: Chi X2
Flows and flash light emission is obtained.

Due to the fall of the SP' signal, the timer is reset 'A'.
Film counter reset signal is also output Timer 2
When the 8θ is reset and a certain period of time has elapsed, an Sp reset signal is output from the flip-flop 9. N
A N 1. ) The output of gate 21 is at a positive level, but since the Sp' signal is at a negative level, NAND gate 45
The output remains at a positive level and the AE hold is maintained.

When the shutter operation is finished, the release button returns to L, 8p.
When the switch is turned off and the Sp' signal returns to +F and I novel (1), the output of the NAND gate 45 becomes a negative level and the generation of the AE hold signal is stopped. It also stops working.

If the camera is placed in a bag etc., the release button may not be pressed (
If the button 2 continues to be pressed (the number 2 depends on the timing operation of the timer 280), an AE reset signal is output from the NAND gate 102 after a certain period of time (90srffi in this case) has elapsed. As a result, the A E hold signal is set to a negative level (Ni), and the constant voltage 1 and Raku 242 are turned off. The above explanation is shown in the form of a flowchart in FIG.

1most shadow i+'-end'f l, , the release button returns to C2 (2, first, the Sp switch turns off C2, then the 1゛1 switch turns on. Signal fall j) C yo +), -7II Rough -7 Rozzo 2/l,
29 (vPJZ diagram) is set, the second power supply system is activated, and the inverter 53 outputs a winding hold signal, and also outputs a timer reset signal and a film counter reset signal. In response to the winding hold signal, a normal rotation signal is supplied to the motor circuit 238 (=
Motor M rotates forward. - The T2 switch is turned off (2) during the winding of the evenly distributed film, - When the winding of the frame is finished, the T2 switch is turned on (2. level, and the output of the NAND gate 67 becomes a positive level.As a result, 1) the E rotation signal is completed, and a brake signal is output, and the rotation of the motor M instantaneously (stops and stops. Same as inside (2, also at this time, the second
The power supply system is the Q of the flip-flop 89 of the timer 280.
Once output is obtained, it stops operating and does not consume excess power.

Here, we will explain the operation in the case where a specified number of frames have been photographed and a so-called film end condition occurs.In this case, the film is not wound even if the motor rotates forward.This example Now, when a certain predetermined period of time (in this case, 2) has elapsed after the winding hold signal was output, the outputs of the flip-flops 95 and 96 of the timer 280 both reach the (2"J level), and the NAND gate 8 ( The output reaches the noha shell level.For this reason, the forward rotation signal is turned off and the rotation of the remoter stops.At the same time (2. PeV ON No. 43 is output from the inverter 85 and NA N 1))
C'll'L (previous issue) is output from f-to 82. From this area 2, exposure control circuit 244 (2 fixed type; "- is applied, and the J'CV element incorporated in C2 is The signal is oscillated and the person in the shadow is informed that the film has ended.

After this, the winding hold reset 4fN is output from the inverter lθ1, and the output of the NAND gate 29 becomes 1'' - iE level ζ2, so the output of the NAND gate 9 becomes a negative level.As a result, ψ, 2' The skewer 5 source system is turned off and the PCV oscillation ends.Alternatively, when the photographer turns on the rewind switch T3 by turning the PCV element β4hψ on, the inverter 55 A reverse rotation signal is output from.

In the motor circuit shown in FIG. The film is rewound to the Hatron side.The film is completely rewound (2 rewound tl, XK switch (
5) turns on (-), the entire power supply system turns off 1. The operation ends.

Meanwhile, the film is wound up twice,
When switch 2 is turned on and the second power source system is turned off, if the main switch F is on, the strobe is charged at the same time (= practically used. ``1-'', the power supply system is turned off, but since the converter signal is output, the strobe is charged as described in ^1■.After this, the release button is pressed in the waiting state (2) in Figure 10. The flIIt operation up to this point is shown as a flowchart in FIG.

As explained above (=, according to this embodiment, the power supply is stopped at 11 dynamic (2 stops, 1 L L
, 9) Provides a camera power supply that can avoid unnecessary power consumption.

Please note that the above explanation is based on the ``1-bore built-in automatic exposure, self-4i''
# Film winding (I went with the camera, but this invention is not limited to C2.

[Brief explanation of the drawing]

Fig. 1 is a block diagram schematically showing an embodiment of a camera power supply device according to the present invention, Figs. 2 and 4 are detailed circuit diagrams of the power supply system of this embodiment, and Fig. 5 is Figure 6 is a diagram showing the four-body configuration of the film detector of this example, Figure 6 is a specific circuit diagram of the motor circuit of this example, and Figure 7 is the actual strobe circuit of this example. Fig. 8 is a specific circuit diagram of Shimako's actual installation: Denen-laku, and Fig. 9 to η! This is an IJ-chart. 210...Battery, 212...Gate circuit 214
...Dry feed control circuit 216... Constant voltage control circuit 218... Winding control circuit 220... Converter control 111 circuit 222... Rewinding control circuit 238... Motor, 242... Constant voltage circuit 244・
...Exposure control circuit 26... Strobe circuit applicant's representative Patent attorney Takehiko Suzue Figure 7 290 Commissioner of the Patent Office Kazuo Wakasugi 1. Incident Display Special Application No. 58-23627: 3. Relationship with arrestee case Patent applicant (037)t! , 1 Seo Gus Optical Industry stock extra line 4, agent fi, i'rlL+l:, full text of the subject specification

Claims (1)

[Claims] < Camera electric fllit having at least one of a small control circuit, a strobe circuit, and a film winding motor.
A power supply device which has means for detecting the absence of film in the camera, and stops supplying power in response to an output signal (1) of the detected half-immersion.