JPH01310329A - Battery checking device for camera - Google Patents

Abstract

PURPOSE:To check the battery even in a camera which has an electromagnetically driven shutter by providing a control circuit which drives a shutter blade in the reverse direction of a normal direction when battery is being checked. CONSTITUTION:Load resistance mainly consists of the coil of the driving sources MG1 and MG2 of the electromagnetically driven shutter is permitted to be the actual load resistance for the camera battery check, and the shutter control circuit SHT is provided for the load resistance for conduction so as to apply the driving power in the reverse direction of the blade running direction by the subsequent exposure operation. When the battery is being checked by such composition, a signal of SDIR 'H' is sent to the control circuit SHT of the MG1 and MG2 from a camera control circuit PRS, and the shutter running direction is reversed. Thus, the camera which has the electromagnetically driven shutter does not allow the shutter to open when checking, and wire breaking is also checked.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Applicability) The present invention relates to a battery check device for a camera having an electromagnetically driven shutter that performs exposure by driving, by electromagnetic force, a light shielding member that opens and closes a shutter exposure opening. It is also possible to check for disconnections in the coil of the electromagnetic drive source for the shutter.

[Conventional technology]

Conventionally, a known shutter mounted on a camera uses a spring 5 to drive the shutter blade, for example, as shown in FIG.
1 and 52, energy is stored in the spring in the set state, and levers 53 and 55 and levers 54 and 56 are engaged and held.

Furthermore, the charge lever 57 that sets the shutter blades in 8 rows holds the levers 53 and 54 from setting until the end of the quick return mirror (not shown) up operation at the time of the next photograph. Even if the electromagnetic devices 61 and 62 that control exposure are energized (the levers 55 and 56 are actuated to release the aforementioned engagement) and the electromagnetic devices 61 and 62 are activated, the shutter blades do not move. There isn't.

Therefore, it was possible to check the battery condition by energizing the coils of these electromagnets as an actual load for checking the battery of the camera and checking the battery voltage at that time. At the same time, it was possible to check for wire breakage in the coil, thereby preventing the curtain from running with the curtain closed when the open blade coil was broken and the curtain remaining open when the closing blade coil was broken.

However, in an electromagnetic drive shutter, that is, in an electromagnetic drive shutter in which the shutter blade is directly driven by electromagnetic force without using the force of a spring, the output shaft of the electromagnetic drive source is almost directly connected to the shutter blade as the drive shaft of the shutter blade. Unlike the shutter described above, it is not possible to separate the drive and control of the shutter blades.

(Problems to be Solved by the Invention) As mentioned above, in the electromagnetic drive shutter, since the drive and control of the shutter blades cannot be separated, the actual load for checking the battery of the camera is
Alternatively, with the intention of checking for a disconnection, the coil of this electromagnetic drive source is energized in the direction in which the driving force is applied in the direction of travel of the shutter blades in the next exposure operation, as in the known shutter shown in FIG. If this happens, there is a problem in that the shutter blade starts running even though a regular running signal is not being output.

The present invention attempts to solve these problems. That is, the present invention provides a battery check device for a camera that is capable of checking the battery of a camera equipped with an electromagnetic shutter using the actual load of the coil of the shutter, and also checking for disconnection of the coil. The purpose is to provide

[Means to solve the problem]

In order to achieve the above object, the present invention provides a camera having an electromagnetically driven shutter that performs exposure by driving a light shielding member that opens and closes a shutter exposure opening by electromagnetic force.
The load resistance mainly consisting of the coil of the electromagnetic drive source that generates the electromagnetic force is used as the actual load resistance for battery checking of the camera, and the load resistance is set in a direction opposite to the running direction of the light shielding member in the next exposure operation. The shutter is equipped with an electric shutter control circuit that energizes so that a driving force by electromagnetic force is applied in the direction.

[For production]

According to the present invention, when checking the battery of the camera, electric shutter control is performed to energize the coil of the electromagnetic drive source of the shutter so that a driving force acts in the opposite direction to the traveling direction of the shutter blades in the next exposure operation. Since it is equipped with a circuit,
The shutter blades will no longer start traveling in the exposure direction when checking the battery, so even in cameras equipped with electromagnetic shutters, battery checks can be performed using the actual load of the shutter's coil, etc. You can also check for wire breaks in the coil.

〔Example〕

1 to 10 show an embodiment of the present invention, that is, an embodiment of an electromagnetic shutter that performs exposure on both the outward and return passes to which the present invention is applied. FIG. 2 is a perspective view showing the entire electromagnetically driven shutter (before the start of outward travel or in a state where return travel is completed); Fig. 2 is a front view of the shutter in the same state as Fig. 1, and Fig. 3 is a front view of the shutter in the same state as Fig. 1, with the electromagnetic drive source that controls the operation of the shutter blade group removed (blade drive lever , brake mechanism, signal contact piece, etc.) is a front view. Further, FIGS. 4 to 6 are front views showing the movement of the blade drive lever and the brake mechanism, with the electromagnetic drive source portion omitted. Of these, FIG. 4 shows immediately after the start of slit exposure, FIG. 5 similarly shows the middle of the second half of slit exposure, and FIG. 6 shows a fully open exposure state. FIG. 7 is a front view of the shutter showing a state in which the forward travel is completed or before the start of the return travel, and FIG. 8 is a front view showing the shutter in the state shown in FIG. 7 with the electromagnetic drive source portion removed.

In FIGS. 1 to 8, reference numeral 1 denotes a shutter base plate, and an opening 1a is provided in the center of the plane. A cover plate 2 is attached opposite to the shutter base plate 1 so as to maintain a constant gap, and has a similar opening (not shown) at a position corresponding to the opening 1a. A blade group 3 and a blade group 4 are provided between the shutter base plate 1 and the cover plate 2, with a partition plate 5 (having an opening 5a at a position corresponding to the opening 1a) sandwiched therebetween. They are configured to be opened and closed by the operation of two blade arms 6 and two blade arms 7 (the blade arms of the blade group 3 are not shown) and a known link mechanism. 8 is a blade dowel for rotatably connecting the blade and the blade arm, and both blade groups 3.4 have the same structure as the blade unit.

Here, since the parts related to the drive of the blade group 3 and the parts related to the drive of the blade group 4 have similar structures and operations, hereinafter, the reference numerals of the parts related to the drive of the blade group 4 are used to refer to the parts related to the drive of the corresponding blade group 3. The numbers related to the drive of the blade group 3 are expressed by adding 100 to the reference numerals, and the description of the drive of the blade group 3 is representative.

Reference numeral 9 denotes a drive lever, which is connected to the blade arm by a pin 9a, and drives the blade group 3 to open and close by rotating around the axis P. The lever 9 also has a hole 9b near the center that receives the transmission of the driving force, and a pin on the transmission side (planted on the lower surface of the connecting lever 10, which will be described later); (at the same position and with the same diameter as the pin 10c) with a predetermined play in the rotational direction around the axis P.

Reference numeral 10 denotes a connecting lever, which is directly connected to the output shaft of the electromagnetic drive source (coaxial with the above-mentioned P), and transmits the rotational force around the axis P of the electromagnetic drive source to the drive lever 9 through the lower transmission side pin of the pin lOc. At the same time, the lower vertical parts 10a and 10b have a spring property on the brake lever 11 (in Fig. 3, the spring property is in the direction of arrow A, and the spring property is in the direction perpendicular to arrow A). The brake lever 11 is rotated in a predetermined direction and at a predetermined angle around the axis R by engaging with the arms 11a and llb (hard to bend), releasing the stopper when the blade group 3 starts traveling, and generating a braking effect when the travel is completed. Do this.

In addition to the above-described structure, the brake lever 11 has a protrusion 11c and a lid that act on the side surface of the pin 9a of the drive lever 9 and serve as a stopper and a brake, and a spring 15 that provides rotational behavior around the axis R. It has an arm part lie that receives force.

12 is a stopper pin that comes into contact with the side surface of the brake lever 11 and restricts clockwise rotation of the brake lever 11;
13 is a stopper pin that also restricts the counterclockwise rotation of the brake lever 11.

Reference numeral 14 denotes a swinging lever, which is rotatably supported around an axis T, and supports a spring 15 at the tip of the lever to give the brake levers 11 and 111 the ability to rotate around the axis R and axis S, respectively. Rotation around the axis T is performed by the balance of the spring force of the spring 15.

16 and 17 are rubber stoppers, which are attached to the pin 9a of the drive lever 9.
It acts on the sides of the blade and reduces the shock to the blade when the blade ends.

Reference numeral 18 designates a base plate for electromagnetic drive source, which is made of insulating and non-magnetic material such as plastic, and has the electromagnetic drive sources MGI and MG2 for driving and controlling the blade group 3.4 on the upper side, and the electromagnetic drive sources MGI and MG2 for driving and controlling the blade group 3.4 on the lower side. Signal contacts 19, 20 for detecting running conditions
and 119 and 120, and is fixed to a column 22 installed in the shutter base plate 1 with screws 21. Here, the signal contacts 19 and 20 have their bases supported by the electromagnetic drive source ground plate 18, and their tips abutted against pins 23 planted on the lower side of the ground plate 18 with a bulletin board to determine their positions. There is. The position is within the rotational region of the pin loc around the axis P, and the running state of the blade group is detected by turning ON/OFF the contact point in response to the opening/closing operation of the blade group 3.

24 is the yoke of the electromagnetic drive source MCI, 25 is a permanent magnet,
It is magnetized in the vertical direction of the figure. 26 is a moving coil,
It is rotatably supported around an axis P, and when a current is passed through it, an electromagnetic force is generated, forming a so-called meter-type electromagnetic drive source that generates rotational force. Then, by detecting the ON and OFF states of the contacts mentioned above, the direction of the current flowing to the coil is reversed, and the coil reciprocates. Reference numeral 27 denotes a holding plate for fixing the electromagnetic drive source MCI to the ground plate 18, and is coupled to the ground plate 18 with screws 28.

FIG. 9 is a block diagram showing the electrical configuration of the above embodiment.

In FIG. 9, PH1 is a control circuit, for example, a chip microcomputer in which a central processing unit CPU, RAM, ROM, human output port, timer circuit, etc. are arranged. Software such as circuits and parameters are stored.

The boat manually operates a switch that detects the state of the shutter, outputs a shutter energization signal, etc., and the timer counts a set time to time the shutter control. Further, SHT is a shutter control circuit and receives a control signal 5SHTI from the control circuit PR5.

5SHT2 and the running direction signal 5DIR energize the electromagnetic drive sources MGI and NG2, respectively. When the drive source MCI is energized, the blade group 3 runs in the direction specified by the running direction signal 5DIR. The energization is stopped after the time required for No. 3 to complete running has elapsed.

The same applies to the blade group 4, and when the drive source MG2 is energized by the 5SHT2 signal, the blade group 4 is driven.

The state of the shutter is transmitted from the shutter control circuit SHT to the control circuit PR5 by state signals 5SWI and 5SW2. When contact pieces 19 and 20 are in a conductive state, 55111
outputs "H", and when contact pieces 119 and 120 are in a conductive state, 5SW2 outputs "H". When each wire is disconnected, it outputs "L".

In other words, 5SW1= @H", 5SW2= "L
”, it is before the start of the outward journey (Fig. 3), and conversely, it is before the start of the outward journey (Fig.
5111 = "L", 5SW27 In the case of "H", the shutter is fully open (Fig. 6), which indicates before the start of return travel (after the end of outward travel) (Fig. 8), 5SWI =
“L”, 5SW2=“L”.

Next, the operation of the embodiment configured as described above will be explained.

With Figures 1 to 3 as the starting state for the outbound trip, first a so-called battery check is performed to confirm whether or not there is enough energy in the battery for the camera to operate correctly. A rotational force is applied to the coils 26 and 126 of the electromagnetic drive source that drives and controls the blades 4 in a counterclockwise direction around each rotation axis P and Q, that is, in the opposite direction (locking direction) to the direction in which the blades will run and perform exposure. A predetermined current is applied for a predetermined time so as to give

In this case, by conducting a battery check by energizing both coils 26.126 at the same time, the state in which both coils 26.1'2B are energized at the same time at high speed (the most severe power condition) can be reproduced. This ensures the accuracy of the exposure time and also checks for disconnections in both coils 26 and 126. However, even if only one coil is energized, it can still be used as a battery check.

If the battery check is NG, the camera will stop the sea fence and become inoperable. If the battery check is OK (good), the coil 26 that drives and controls the blade group 3 (which becomes the leading blade during outward travel)
A predetermined current is started to be applied so that the coil rotates clockwise around the axis P, and the shutter starts an exposure operation. The rotation of the coil 26 is directly transmitted to the connecting lever 10, and the lever 10 starts rotating clockwise around the axis P.

At that point, as shown in FIG. 3, there is some play between the pin 10c on the lower surface of the connecting lever 10 and the sixth part 9b of the drive lever 90 on the clockwise rotation side, so the rotation of the connecting lever 10 is caused by the drive. The information has not yet been transmitted to the lever 9, and the blade group 3 remains in the start preparation position. In addition, brake lever 1
1, the side surface of the lever is brought into contact with the stopper pin 12 while being given a clockwise rotational habit around the axis R by the spring 15, and the protrusion 11c is placed within the travel area of the bin 9a of the drive lever 9. The pin 9a of the drive lever 9 is pushed out by a predetermined amount and pressed into the area formed by the protrusion lie and the rubber stopper 17, thereby regulating the fluctuation of the start preparation position of the blade group 3. Immediately after the connection lever lO is rotated, the lever 1
The lower vertical bent portion 10a of 0 pushes the tip of the arm portion 11a of the brake lever 11 in a direction substantially perpendicular to the direction of arrow A,
The brake lever 11 is rotated counterclockwise around the axis R against the clockwise rotational tendency of the spring 15. Then, due to the rotation of the connecting lever 10, the play between the bottle lOc on the lower surface and the hole 9b of the drive lever 9 is eliminated.
At the time of contact, the brake lever 11 touches its protrusion ti.
c is rotated until it is retracted out of the travel area of the bin 9a. For the first time, the rotational force of the electromagnetic drive source MGI is transmitted to the drive lever 9, the drive lever 9 begins to rotate clockwise around the axis P, and the blade group 3 begins to open. At this time, the connecting lever 10 has gained momentum by making a certain amount of rotational angle run-up, so the rise of the opening operation of the blade group 3 becomes sharp.
Contributes to improving curtain speed.

Eventually, as shown in FIG. 4, immediately after the blade group 3 starts the opening operation, the connecting lever 10 further rotates the brake lever 11 in the counterclockwise direction, and the lower vertically bent portion 10a and the arm portion 11a are engaged with each other. to leave.

At this time, the brake lever 11 has already been given the habit of rotating counterclockwise around the axis R. That is, the swing lever 14 is connected to the arm part lie of each brake lever.
This is because the spring 15 is rotated clockwise around the axis T to a position where the spring 15 is balanced by the position 1ife.

In order to perform proper exposure after the coil 26 for the blade group 3 is energized, a predetermined exposure time T (based on the number of exposure stages of the camera), even +fl/2n (n is an integer) seconds, is set. ), plus the second time ΔTl (so-called start-up adjustment) that must be adjusted according to the response characteristics and drive characteristics of the drive control system specific to the shutter unit, or the running characteristics of the blade system, and then the blade group 4 energization is started to the coil 126, and a closing operation is performed.

Furthermore, as time passes and as shown in FIG. The protruding portion lid is made to protrude by a predetermined amount into the travel area of the pin 9a of the drive lever 9, and the bottle 9a waits for the travel of the bottle 9a.

Eventually, when the pin 9a comes into contact with the protrusion lid, the pin 9a rotates the brake lever 11 clockwise against the counterclockwise rotational behavior of the brake lever 11 due to the spring 15, since the blade group 3 has considerable running energy. It rotates in the direction and attempts to move to the final stop position.

At the same time, the lower bent portion 10b of the connecting lever 10 comes into contact with the side surface of the springy arm portion 11b of the brake lever 11, and while pushing the arm portion 11b away in the direction of arrow A, it also returns to the final stop position. I'm trying to move on. therefore,
The blade group 3 is braked by the conversion of these spring drag forces and energy into rotational motion by the brake lever 11, allowing stable running with excellent durability. Furthermore, feather group 3
The bounce immediately after reaching the travel completion position is due to the spring 15
The protruding portion lid of the brake lever 11, which is given a counterclockwise rotational habit, presses the pin 9a toward the area formed by the rubber stopper 16 and is removed. Also, the contact pieces 19 and 20, which were in contact (ON) state before the blade group 3 started traveling (Fig. 3), are in contact (ON) state at the time when the blade group 3 completes traveling
6 and 8), it is in a non-contact (OFF) state.

Blade group 4 (which becomes the trailing blade during outbound travel) performs exactly the same operation as blade group 3 with respect to its driving and braking, except for the closing operation. Before the blade group 4 travels (Fig. 3, Fig. 6), there is a non-contact (O
The contact pieces 119 and 120, which were in the FF) state, become in contact (ON) state when the blade group 4 completes travel (FIG. 8).

The above-described brake mechanism can operate in the same manner as described above in both the slit exposure shown in FIG. 5 and the full-open exposure shown in FIG.

As shown in FIGS. 7 and 8, the forward travel is completed, the blade group 4 blocks the opening, and the exposure is completed. In this state,
Compared to before the start of the outward journey, the number of blades involved in blade group 3 and blade group 4
The things involved in this are completely reversed. In other words, this state becomes the next return trip start state. Therefore, the camera control microcomputer first determines which contact pieces 19, 20 and 119.
It is detected that the ON and OFF states of 120 are reversed from before the start of outward travel, and the drive control of each blade group 3.4 is performed so that the traveling direction of blade groups 3 and 4 is opposite to that during the outward travel. The direction of energization to the coils 26 and 126 is reversed.

Hereinafter, in the return trip, the functions of each part are reversed from those in the above-mentioned outbound trip (for example, the protrusion lid of the brake lever 11
(controls the fluctuation of the start preparation position of the blade group 3, and the protrusion 11c acts as a brake and prevents bouncing when the blade group 3 finishes traveling, etc.), so only the characteristic parts will be described.

First, to check the battery, each coil 26, 126 is energized so as to apply a rotational force in the opposite direction (lock direction) to the direction in which exposure is performed during the return trip. on the other hand,
The only thing that is different from the outward trip is the geta adjustment, in which the roles of leading blade and trailing blade are switched between blade groups 3 and 4, so the order of energizing the coils 26 and 126 of each electromagnetic drive source MGI and MG2 is changed. Both electromagnetic drive sources MCI
, due to subtle differences in the characteristics of MG2, differences in the characteristics of the same electromagnetic drive source itself due to differences in the rotation direction, differences in the operating load of the blade groups due to differences in the travel direction of the blade groups, etc.
If T1 is used as it is, proper exposure time accuracy cannot be obtained.
Another getter adjustment ΔT2 is provided for the return journey, and the contact piece 19 is also set.
Detects and switches the ON and OFF states of ゜20, 119, and 120.

Further, when the return trip is completed, the state shown in FIG. 3 is reached, and the contact pieces 19, 20 and 119 and 120 are ON.

Since the OFF state is the opposite of what it was before starting the return trip (that is, the same as before starting the outward trip), the camera's control microcomputer detects this and reverses the current direction to the coil 26.126 again to make the getter adjustment. The vehicle is switched to 6-1 and enters the outbound traveling start state mentioned at the beginning of the operation description.

Next, driving of the electromagnetic shutter will be described based on the timing chart of FIG.

(Time a) SS) ITI and 5SHT2 are energized at the same time to perform a battery check. Since the state of the shutter is after the end of the return journey, the shutter blade group 3 is closed and the blade group 4 is open. Therefore, 551111-"H".

5SV12 = ”L@.Battery check is performed in the direction in which the shutter blades do not travel, that is, in the direction of blade group 3.
is opened and closed, and the blade group 4 is energized between closed and opened. Such a current direction is specified by 5DIR="H".

(Time b) When the battery check is completed, 5DIR is set to "L" in order to change the shutter running direction.This sets the shutter running direction for the outbound trip.

(Time C) When the magnet of the shutter blade group 3 is energized, the blade group 3 moves in the closed-open direction and becomes the leading curtain.

(Time d) When the blade group 3 becomes open, the signal becomes 5SWI-"L".

(Time e) The energization of SSHTI is stopped after a sufficient time has elapsed since time C for the shutter blade to travel.

(Time f) After a time period obtained by adding the predetermined exposure time T and getter adjustment ΔT1 from time C, 5SHT2- becomes "H" and the blade group 4 runs. When 5DIR=“L”, the blade group 4 is energized in the direction of opening the gate (rear curtain running).

(Time g) When the blade group 4 is no longer in the open state, 5SW2- becomes "H".

(Time h) SSHT2 is energized after a certain period of time has elapsed from time f.
Stop.

In this way, the outbound shutter travel is completed. At this time, the blade group 3 is open and the blade group 4 is closed, and the blade group 3 remains closed-open and the blade group 4 remains open-closed due to the running direction signal 5DIR-"L".

Furthermore, the return journey will be explained.

(Time i) A battery check is performed. Since the running direction is the same as at the time of the clock, the vehicle cannot run.

The battery is checked at time a and energized in the opposite direction.

(Time j) After checking the battery, set 5DIR=“H” and set the running direction in the opposite direction.

(time k) On the return trip, the blade group 4 becomes the leading curtain and travels first.

(Time l) When the blade group 4 is in the open state, it becomes 5SW2-@L''.

(time m) SSHT2 stops energizing after a certain period of time from time k.

(Time n) From time k to the predetermined exposure time T and the outbound shift adjustment Δ
After the time T2 has been added, blade group 3 starts running (SS
HTI = “H”).

(Time O) When the blade group 3 is no longer in the open state, 55wt - "H"
become.

(Time p) When a certain period of time has elapsed from time n, energization is terminated at 5SHTI-".

In this way, the shutter travel on the return trip is completed.

〔Effect of the invention〕

As explained above, according to the present invention, when checking the camera battery, the coil of the electromagnetic drive source of the shutter is
Equipped with an electrical shutter control circuit that energizes the shutter blades so that the driving force works in the opposite direction to the direction in which the shutter blades will travel during the next exposure operation, so the shutter blades will not start traveling in the direction of the exposure operation when checking the battery. Therefore, even in cameras equipped with an electromagnetic shutter, it is possible to check the battery based on the actual load of the shutter's coil, etc., and it is also possible to check for disconnections in the coil, thereby preventing malfunctions such as running with the curtain closed or leaving the curtain open. It has the effect of preventing

[Brief explanation of the drawing]

1 to 10 show an embodiment of the present invention, of which FIG. 1 is a perspective view showing the entire electromagnetically driven shutter, and FIG. 2 shows the shutter in the same state as FIG. 1. Figure 3 is a front view showing the state shown in Figure 2 with the electromagnetic drive source removed, and Figure 4 is a front view showing the movement of the blade drive lever and brake mechanism immediately after the start of slit exposure. Figure 5 is a front view showing the movement of the blade drive lever and brake mechanism during the second half of slit exposure, and Figure 6 is a front view showing the movement of the blade drive lever and brake mechanism during full-open exposure. Figure 7 is a front view of the shutter showing the state at the end of the outbound trip or before the start of the return trip;
Figure 8 is a front view of the state shown in Figure 7 with the electromagnetic drive source section removed, Figure 9 is an explanatory diagram showing the electrical configuration as a block diagram, and Figure 10 is a timing chart. It is an explanatory diagram. Further, FIG. 11 is a perspective view showing an example of a conventional technique. 3.4...Blade group, 6.7...Blade arm,
9.109... Drive lever, 10.110... Connection lever, 11, 111... Brake lever, 14... Rocking lever, 15... Spring, 19, 20.119
, 120... Contact piece, 26, 12 [i... Moving coil, PR5... Camera control circuit, 5) IT... Shutter control circuit, MCI, MG2... Electromagnetic drive source.

Claims (1)

[Claims] 1. In a camera having an electromagnetically driven shutter that performs exposure by driving a light shielding member that opens and closes a shutter exposure aperture using electromagnetic force, a load resistor mainly consisting of a coil of an electromagnetic drive source that generates the electromagnetic force is used as a load resistor of the camera. It is equipped with an electric shutter control circuit that serves as an actual load resistance for battery checking and that energizes the load resistance so that a driving force by electromagnetic force acts in a direction opposite to the traveling direction of the light shielding member in the next exposure operation. A camera battery check device characterized by: