JPH0241013B2 - AKUCHEETAOKUDOGENTOSHITASUITSUCHINYORUSHINGOKIOKUHOJISOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal storage/holding device using a switch using a so-called actuator, such as a moving linear drive device, as a drive source.

A good example of a device that employs the above device is an automatic camera. In other words, the movement of the actuator operates the shutter blade or the aperture blade that also serves as a shutter blade, and the movement of the actuator is also linked to turn on the switch.
This is used in such a manner that the blade operation signal is memorized and retained in this switch-on state. The necessity of storing the above-mentioned signals is that the stored signals can be used to timely operate the next steps of the camera, such as the film winding and feeding motor, strobe flash charging, etc. Needless to say.

By the way, in order to operate the next step correctly, the above-mentioned signal storage state, that is, the on state of the switch, must be reliably maintained. For example, in this type of camera proposed earlier by the applicant, the above-mentioned Instead of a switch, the control circuit that drives and controls the actuator captures the back electromotive force generated in the coil when the shutter is operated, that is, holds it as an electrical signal, so that the circuit operates normally. If it does, there is no problem, but for some reason, such as when the photographer stops the release operation immediately after the shutter device completes operation and turns off the power, the circuit stops working and the release operation becomes difficult. If the circuit has already been reset to the previous state, the circuit cannot re-detect which process state the camera is in. For example, if the circuit has been stopped and reset during the process before film winding, the circuit cannot re-detect the process state in which the camera is operating. When the camera is turned on, the shutter starts to open and close again, and because the previously shot film has not been fully rewound, a double exposure occurs, and the power is turned off and then turned on again before the rangefinder has finished charging. If the camera is inserted into the camera, the distance measuring device will not work properly, and in this case, the photos taken will be out of focus, causing malfunctions.

Therefore, in this invention, instead of detecting operating signals such as shutters using the electrical signals mentioned above, we use a mechanical switch that can be reliably held, and also use a permanent magnet in this switch. This will ensure that the system is maintained securely, and eliminate the causes of malfunctions such as those mentioned above.

The details of the embodiment will be described below with reference to the drawings, taking a camera as an example.

Reference numeral 1 denotes an actuator consisting of a movable linear drive device, and a movable arm 2 is connected to this actuator 1, and this movable arm 2 has a shutter blade or an aperture blade 3 that also serves as a shutter blade (hereinafter simply referred to as a blade).
are connected via a connecting pin 4 so that they can be opened and closed. On one side edge of the rotating end of the movable arm 2 is a non-magnetic movable contact piece 5 made of phosphor bronze or the like that constitutes the switch S.
A permanent magnet 7 is fixed to the side of the movable contact piece 5 facing the fixed contact piece 6, and this permanent magnet 7 is attached to the fixed contact piece 6 side (on side). ) so that it can be freely attracted to the magnetic body 8 that also serves as a stopper, and the back side (off side) of the movable contact piece 5.
Similarly, a magnetic body 9 which also serves as a stopper is faced.

Note that the movable contact piece 5 is biased in a direction away from the fixed contact piece 6, and its base portion is fixed. Also magnetic material 8,
In this example, 9 is formed by cutting and raising the base plate.
10 is the release lever, 11 is the reset lever,
12 is an opening.

Therefore, when the release lever 10 is pushed in FIGS. 1 and 2, an unillustrated switch associated with this pushing action is activated to drive the exposure control circuit, and the actuator 1 is operated by the current from this control circuit. At the same time, the movable arm 2 rotates slightly, and the blade 3 is opened and closed by this rotation. On the other hand, due to the rotation of the movable arm 2, it has been turned off until now.
The movable contact piece 5, which had been held in this state, is instantly pushed out and the attraction force of the permanent magnet 7 opposes it.
It acts on the magnetic body 8 on the on side, so that the movable contact piece 5 automatically comes into contact with the fixed contact piece 6 as shown in FIG. 3, and at the same time, the permanent magnet 7 is attracted to the magnetic body 8 and the switch is maintained in the on state. In other words, the closed signal of the operated blade is stored and held.

It goes without saying that the above-mentioned stored signals cause the camera to operate in the next process as described at the beginning.

Then, as shown in FIG. 4, when the reset lever 11 is advanced by an appropriate means after the camera process is completed, the movable contact piece 5 is pushed back against the suction holding force of the movable contact piece 5. is attracted and held by the off-side magnetic body 9 by the relatively weak attraction force of the magnet that permeates through this contact piece. Further, the retraction release operation of the reset lever 11 from the state shown in FIG. 4 is performed in response to a distance measurement completion mechanical signal or a release stroke signal.

In other words, after the shutter blade close signal is received and the next process is performed, the shutter is reset and the switch is held in the OFF state, but it is important to also hold this reset lever.In other words, if the reset lever is returned in the reset state, the camera This is because there is a risk of being sucked back into the on state when an external shock is applied.

As the permanent magnet shown in the above embodiment, it is desirable to use a magnet with a high coercive force, such as ferrite or rare earth.

As described above, according to the present invention, a mechanical device (the shutter blade in the embodiment) is operated as appropriate by the movement of the actuator, and this operation signal is also applied to the ON state of a mechanical switch operated by the movement of the actuator. In particular, in the present invention, the on state of the switch is increased and maintained by the attraction action of a permanent magnet, so for example, when this device is used in the camera mentioned above, the power supply is This is a great feature because it eliminates the possibility of the camera being cut off during the operation process, and prevents system malfunctions from occurring.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of the main part, FIG. 2 is a plan view of the same as above, and FIGS. 3 and 4 are plan views showing an explanation of the operation.

Claims (1)

[Scope of Claims] 1. A device in which a mechanical device is appropriately operated by the movement of an actuator, and the operating state is memorized and retained by a mechanical switch operated by the movement of the actuator, wherein the mechanical switch is ) a movable contact piece that is provided with a permanent magnet and is pushed by the actuator and displaced between an ON position and an OFF position; (b) a fixed contact piece that this movable contact piece abuts in the ON position; and (c) the movable contact piece. A signal storage/holding device using a switch whose drive source is an actuator consisting of holding means that attracts and holds the permanent magnet in the ON position of the contact piece.