JPS6232280Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a device for determining the operation status of an electrically controlled shutter, and more specifically, a shutter operating mechanism and an electric circuit section including a release circuit and an exposure time control circuit are separated from each other. The present invention relates to a device for determining the operation quality of an electrically controlled shutter, which controls opening and closing of the shutter by connecting them with a cable.

Shutters attached to microscope cameras, various industrial cameras, etc. have an operating mechanism built into the camera body, such as an electromagnetic drive unit such as a shutter actuator, which is directly related to the operation of the shutter blade, and a release switch, The electrical control circuit section, including the exposure time control circuit, is incorporated into a control box and separated, and is connected to each other by a cable.

This type of device has the disadvantage that it is difficult for an operator using a control box to detect whether or not the shutter has actually operated, which is extremely inconvenient in terms of operation.

In view of the above-mentioned drawbacks, the present invention issues a warning when the shutter blade does not operate due to malfunction of the shutter, i.e. mechanical failure of the shutter blade, disconnection of the coil in the electromagnetic drive unit, poor connection of the connector, etc. In addition, it is an object of the present invention to provide a device for determining whether the operation of an electrically controlled shutter is good or not, which prevents the next release operation from being performed.

Regarding a device for determining the operation quality of such an electrically controlled shutter, there is an earlier application filed in 1986-86933 filed by the same applicant. However, the circuit structure had to be complicated. The present invention is an improvement on this and provides an operation quality determination device having a simpler circuit configuration.

The present invention will be explained below with reference to the drawings, but first, the operating circuit of a conventional electrically controlled shutter will be briefly explained as a block system diagram with reference to FIGS. 1 and 2.

Figure 1 shows the shutter opening/closing drive, which consists of a movable or fixed coil and a fixed or movable permanent magnet, and by reversing the direction of the current applied to the coil, the coil or permanent magnet This is done by an electromagnetic shutter opening/closing device which is configured to rotate back and forth within a certain angular range, and open and close the shutter blades by the reciprocating rotation. 1 is an electromagnetic device that opens and closes in conjunction with the shutter blade, 2 is a release circuit that operates in conjunction with the shutter release operation, and 3 is a shutter opening pulse generation circuit that is connected to the release circuit 2 and generates pulses in accordance with its operation. do. 4 is a shutter blade opening drive circuit connected to the pulse generation circuit 3 and the electromagnetic device 1; the shutter blade is opened by applying the output pulse of the pulse generation circuit 3 to the opening coil (not shown) of the electromagnetic device 1; Activate. Reference numeral 5 denotes a delay circuit connected to the release circuit 2, which operates in accordance with the operation of the release circuit 2 and sets the exposure time. A shutter closing pulse generating circuit 6 is connected to the delay circuit 5 and generates a pulse using the output of the delay circuit 5. Reference numeral 7 denotes a shutter blade closing drive circuit connected to the pulse generation circuit 6 and the electromagnetic device 1, which closes the shutter blade by applying the output pulse of the pulse generation circuit 6 to the closing coil (not shown) of the electromagnetic device 1. make it work.

Therefore, according to this type of electrically controlled shutter, the pulse generating circuit 3 generates a pulse in conjunction with the release operation, and the drive circuit 4 passes current to the shutter opening coil of the electromagnetic device 1 to open the shutter blade. exposure. On the other hand, along with the release operation, the delay circuit 5 that forms a delay time according to the field information etc. also operates, and when the pulse generation circuit 6 generates a pulse with the output after the delay time, the drive circuit 7 is activated and current flows through the shutter closing coil of the electromagnetic device 1, closing the shutter blade and ending exposure.

The specific structure of such an electromagnetic device 1 and the above-mentioned shutter operating circuit is disclosed in Utility Application No. 1983-1982 filed by the same applicant.
No. 127569 and Japanese Utility Model Application No. 1986-86933, respectively, but since they are not directly related to the content of the present application, their explanations will be omitted.

Further, the shutter opening/closing drive shown in FIG. 2 is performed by two actuators: an opening magnet and a closing magnet. As in the above case, 12 is a release circuit, 13 is a shutter opening pulse generation circuit that generates a pulse when the release circuit is activated, 14 is a drive circuit that is activated by the pulse, and Mg1 is a drive circuit 14.
This is a shutter opening magnet that is operated by the shutter. Further, 15 is a delay circuit for setting the exposure time that starts with the operation of the release circuit, 16 is a shutter closing pulse generation circuit that generates a pulse with the output after the delay time, 17 is a drive circuit that is activated by the pulse, Mg2 is a shutter opening magnet operated by the drive circuit 17.

Therefore, according to this type of electrically controlled shutter, as in the case of the electromagnetic shutter described above, the opening magnet Ms1 is operated in response to the release operation, and the shutter is opened. Thereafter, after the delay time of the delay circuit 15 has elapsed, the closing magnet Mg2 is activated, the shutter is closed, and the exposure is completed.

FIG. 3 shows the control circuit of the shutter operation quality determination device according to the present invention in relation to the electromagnetic shutter operation circuit of FIG. 1 above, and the same parts as in FIG. Therefore, their explanation will be omitted. Incidentally, the operating circuit of the two-actuator type shutter shown in FIG. 2 can be similarly applied if considered in correspondence with each part of FIG. 1.

20 is a D flip-flop having a data signal input terminal D, a clock signal input terminal C, a reset signal input terminal R, and an output terminal Q. The clock signal input terminal C is connected to the output terminal b of the shutter closing pulse generating circuit 6. SWs is a shutter switch, which is interlocked in a shutter mechanism (not shown) so that when the shutter blade is fully opened, it is reversed and held from the open state to the closed state, and is connected between the power supply V _DD and the ground via a resistor R1. Connection point a with R1 is D flip-flop 20
is connected to the data signal input terminal D of. Tr
is a transistor whose base is connected to the output terminal Q of the D flip-flop 20 via a resistor R2, and whose emitter is grounded. D _L is a warning light emitting diode, Mg3 is a magnet arranged to lock the shutter release mechanism, and these are connected in parallel to each other, and are connected between the power supply V _DD and the collector c of the transistor Tr. SW _R
is a reset switch, which connects the power supply V via resistor R3.
It is connected between _DD and ground, and the connection point with resistor R3 is connected to the reset signal input terminal R of the D flip-flop 20.

According to such a control circuit, by performing a release operation after turning on the power, the connections and mechanisms of each part work normally, and the electromagnetic device 1 is activated via the pulse generation circuit 3 and the drive circuit 4. When the shutter is fully opened, the shutter switch SWs is closed in conjunction with, for example, an opening shutter drive member, and the closed state is maintained throughout the entire time the shutter is fully opened. Therefore, as shown by the solid line in FIG. 5, point a is held at L level during this period, and data signal input terminal D is set at L level. Therefore, when a shutter closing pulse is generated from the pulse generating circuit 6 at the stage when proper exposure has been obtained after an appropriate delay time, the electromagnetic device 1 operates in the opposite direction via the drive circuit 7, and the shutter closes. Closes with a mechanical delay from the time the pulse is generated. In this case, when the shutter closing pulse is generated, the output terminal b of the pulse generating circuit 6 rises from the L level to the H level as shown in FIG. However, as mentioned above, since the data signal input terminal D is at the L level at this rising time, the D flip-flop is not inverted, the output terminal Q is at the L level, and the warning circuit is not activated.

On the other hand, if the shutter does not fully open even if you perform the release operation due to a disconnected connector, disconnection, mechanical failure of the shutter opening/closing mechanism, etc., the shutter opening pulse can be set by performing the release operation after turning on the power. Even if a pulse is generated from the generating circuit 3, the shutter remains open or remains closed, and the shutter switch SWs is kept open, so that the data signal input to point a, that is, the D flip-flop 20, is Terminal D is held at H level (dotted line in Figure 5). Therefore, in terms of the circuit, when an appropriate exposure time is set and a pulse is generated from the shutter closing pulse generation circuit 6 at the output of the delay circuit 5, the voltage at point b, that is, the clock signal input terminal C of the D flip-flop changes from the L level to the H level. rise to the level. Therefore, since the data signal input terminal D is at H level at this time, the D flip-flop 20 is inverted and the output terminal Q becomes H level. As a result, the transistor Tr becomes conductive, operating the magnet Mg3 and locking the release mechanism, and the light emitting diode _DL emits light to issue a warning. This state is maintained until the power is turned off, but after confirmation, by closing the reset switch SW _R , a reset signal is applied to the reset terminal R of the D flip-flop 20.
The D flip-flop 20 returns to its previous state. Therefore, if the release operation is repeated after removing the cause of the malfunction, normal operation will be performed as described above.

Figure 4 shows a case where the shutter operation quality determination circuit according to the present invention is applied to another shutter operation control circuit, but in this case, the shutter closing operation is electrically controlled by one magnet. , the shutter opening operation is done mechanically. In this embodiment, the shutter operation quality determination circuit block has the same structure as that in FIG. In the figure, 21 is a comparator, and Rx is
CdS, C is a capacitor connected in series with CdS, Rx, and its connection point d is connected to the non-inverting input terminal (+) of the comparator 21. SW2 is an exposure start switch connected in parallel with capacitor C. R4 and R5 are bleeder resistors, and the connection point e is the inverting input terminal (-) of the comparator 21.
It is connected to the. Mg4 is a magnet connected to the output terminal b' of the comparator 21, and the output terminal b' is also connected to the clock signal input terminal C of the D flip-flop 20.

Therefore, in this case, when the shutter operates normally and is fully opened by performing the release operation after the power is turned on, the shutter switch SWs closes, and the point a, that is, the data signal input terminal D of the D flip-flop 20 becomes L. level (solid line in Figure 5). On the other hand, when the shutter opens, the start switch SW2 opens, and the capacitor C is charged with a current according to the field brightness, and when the voltage at point d becomes higher than the voltage at point e, The comparator 21 is inverted and the output terminal b' becomes H level (FIG. 5), and the magnet Mg4, which has been in operation up to that point, is demagnetized and the shutter is closed. In this case, as is clear from FIG. 5, the D flip-flop has its data signal input terminal D (point a) at L.
Since the rising signal from the L level to the H level due to the shutter close signal is input to the clock signal input terminal C (point b'), the D flip-flop 20 is not inverted and the output terminal Q is at the L level. The warning circuit will not operate because the

On the other hand, if the shutter does not fully open even if the release operation is performed due to a mechanical failure of the shutter opening/closing mechanism, etc., the shutter switch SWs is left open, so the data signal at point a, that is, the data signal of the D flip-flop 20, is Input terminal D is held at H level (dotted line in Figure 5). Therefore, when the voltage at point d becomes higher than the voltage at point e due to charging of capacitor C, comparator 21 is inverted and output terminal b' becomes H level. The signal is inverted, and the output terminal Q becomes H level. So the transistor Tr
conducts, the magnet Mg3 operates and locks the release mechanism, and the light emitting diode D _L emits light to issue a warning.

Although the present invention has been described above as applied to three different shutter control circuits, it is clear that the present invention is not limited to these, including the operation quality determination circuit.

For example, the D flip-flop described in the above embodiments may of course also include shift registers or other devices that have data and clock signal input terminals and perform the equivalent function of inverting the output every time a clock signal is input when a data signal is input. The switches are not limited to mechanical ones, but may also be other switch members that use light or magnetism to reverse the so-called electrical conduction state, and these switch from a closed state to an open state depending on the circuit connection position. Furthermore, a light emitting diode may be used as a warning member such as a buzzer, and it is also possible to use these in parallel and at the same time. Further, the power switch may be an independent changeover switch or may be linked to a release mechanism.

As described above, if the operation quality determination device according to the present invention is applied to an electrically controlled shutter, the signal obtained from a part of the operating mechanism of the shutter can be used to
It has an extremely simple configuration discriminating circuit that warns of malfunctions, and in that case, the subsequent release operation can also be disabled, so the shutter operating mechanism and the electric circuit are separated from each other so that they can be separated from each other. It has the characteristic that it is extremely convenient to apply to microscope cameras, various industrial cameras, etc. that are connected by cables.

[Brief explanation of the drawing]

Fig. 1 is a block system diagram showing an example of the control circuit of a conventional electrically controlled shutter, Fig. 2 is a block system diagram showing another example, and Fig. 3 is a block system diagram showing an example of the control circuit of a conventional electrically controlled shutter.
A circuit connection diagram showing an example of applying the operation quality determination device according to the present invention to the conventional circuit shown in the figure, FIG. 4 is a circuit connection diagram showing another embodiment according to the present invention, and FIG. 5 is a circuit connection diagram as shown in FIG. and FIG. 4 is a time chart showing the relationship between waveforms of various parts of the embodiment. 1... Electromagnetic device, 2, 12... Release circuit,
3, 13...Shutter opening pulse generation circuit, 4,
7, 14, 17... Drive circuit, 5, 15...
Delay circuit, 6, 16...Shutter closing pulse generation circuit, 20...D flip-flop, 21...
Comparator, SWs...shutter switch,
SW _R ...Reset switch, SW1...Power switch, SW2...Exposure start switch, Tr...
...Transistor, Mg1 to Mg4...Magnet,
D _L ...Light emitting diode, Rx...CdS, C...Capacitor, R1-R5...Resistance.

Claims (1)

[Scope of Claim for Utility Model Registration] In an electrically controlled shutter in which at least the closing timing of the shutter opening/closing timing control device is electromagnetically controlled by an exposure control circuit, a shutter blade opening/closing mechanism. a switch means which can reverse the electrical conduction state when the shutter blade reaches a fully open state in conjunction with the shutter blade; and a switch means which uses the inverting and non-inverting signals of the switch means as a data signal input, and also clocks the closing signal of the exposure control circuit. A D-flip-flop is provided as a signal input, and a warning circuit is connected to an output terminal of the D-flip-flop, and the D-flip-flop is configured to receive a data signal input by the switch means when the shutter blade reaches a fully open state. In the inverted state and non-inverted state, when the clock signal input is applied,
The signal at the output terminal is set to be inverted in the former case and not inverted in the latter case, and the warning circuit is activated only when the signal at the output terminal of the D flip-flop is inverted. A device for determining the operation quality of an electrically controlled shutter, which is characterized by notifying a state in which the shutter is not fully opened.