JPH01123218A - Device for announcing completion of shutter opening/ closing - Google Patents

Abstract

PURPOSE:To enable a photographer to sensuously recognize the completion of a shutter opening/closing action by generating bimorph oscillation sounds after the shutter opening/closing action is completed. CONSTITUTION:An AC voltage generating means which generates the AC voltage of about the level at which a shutter is not opened and closed even if said voltage is impressed to the bimorph 8 is provided. The bimorph is oscillated by impressing the AC voltage from the AC voltage generating means for the specified time after completion of the shutter opening/closing action. Namely, the bimorph is oscillated by impressing the weak AC voltage to the bimorph to announce the completion of the shutter opening and closing as oscillation noises to the photographer.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a device for notifying the completion of shutter opening/closing in a shutter driving device using a bimorph.

Conventional technology With the MIi ellipse, the conventional shutter (spring locking, etc.) allows the photographer to easily feel when the shutter has opened and closed, as the timing before opening and closing occurs appropriately.
The shutter worked, but I no longer felt anxious.

However, in the case of a bimorph shutter, almost no shutter noise occurs before the shutter opens or closes, and when it is incorporated into a camera, the shutter sound cannot be easily heard even if one listens carefully. For this reason, the photographer may feel uneasy because he or she cannot intuitively grasp whether the shutter has operated or not.

C1 Problems to be solved by the invention The present invention is a camera with a bimorph drive type shutter,
The aim is to provide a camera that the photographer can use with peace of mind by allowing the photographer to intuitively know when the shutter has opened and closed.20 Means for solving problemsUsing a bimorph as a drive source At the shutter,
The bimorph can be activated by providing an AC voltage generating means that generates an AC voltage to a level that does not cause the shutter to open or close even when applied to the bimorph, and by applying the AC voltage from the AC voltage generating means to the bimorph for a certain period of time after the shutter opening/closing operation is completed. I made it vibrate.

E1 Effect The present invention aims to improve the problem in a bimorph drive shutter drive device that the photographer cannot sense whether the shutter opening/closing operation is completed because there is almost no time before the shutter opens/closes, and the present invention aims to improve the method. By applying a weak alternating current voltage to the bimorph, the bimorph vibrates and the photographer is notified of the completion of opening and closing of the shutter by making a vibrating sound.

Embodiment FIG. 1 shows an embodiment of the mechanical section of the present invention. This embodiment is a shutter device in which the shutter also serves as an aperture and opens at a constant speed to an aperture value determined by the brightness of the subject. In Figure 0, shutter blades 2 and 3 are fixed to the shutter base plate 1. It is rotatably held on the shaft 4, and the V-shaped notch openings 2b and 3b formed in the shutter blades 2 and 3 are aligned with the center of the exposure opening IC provided on the shutter base plate 1 and the shaft 4. The shape is symmetrical with respect to the line connecting the centers. The long holes 2a and 3a provided in the shutter blades 2 and 3 are connected to the engagement pin 5a provided in the opening/closing lever 5.
, 5b. The opening/closing lever 5 is rotatably held on a shaft 6 on the shutter base plate 1, and the shutter blades 2 and 3 are simultaneously rotated around the shaft 4 by the movement of the engagement pins 5a and 5b due to the rotation of the lever 5. rotate in opposite directions. The V-shaped notch openings 2b and 3b provided in the shutter blades 2 and 3 open and close the exposure opening IC by the above rotation. At the other end of the shutter opening/closing lever 5 (the left end in the figure), there is a bimorph holding member 7 formed in a mouth shape.
The bimorph holding member 7 is fixedly provided with pins 7a and 7b for holding the free end 8a of the bimorph 8. It is held between the pins 7a and 7b, and the other end 8b (the right end in the figure) is connected to the protrusion 1f of the base plate 1 and the push plate 9.
The push plate 9 is held down by the protrusion 1f of the base plate 1 with screws 10. As a result, bimorph 8 is placed on base plate 1.
installed on. Moreover, electrodes 11.12 are attached to the end portion 8b of the bimorph 8. The shutter opening/closing lever 5 is formed with a long hole 5C that engages with the shaft 4, and the shaft 4 moves symmetrically within the long hole 5c as the lever 5 rotates. Note that the shutter base plate 1 is provided with a notch 1d and a hole 1e to prevent the pins 5a and 5b set on the opening/closing lever 5 from coming into contact and interfering with the movement of the lever.

Next, the electric circuit of this embodiment shown in FIG. 2 will be explained. In FIG. 2, 24 is a camera control circuit which controls all operations of the camera. This circuit is the shutter open signal 2
1 and a shutter close signal 22 are outputted and input to the bimorph drive circuit 25 to drive the bimorph 8. The shutter open signal 22 is input to the bimorph drive circuit 25, and when the input is finished, the bimorph drive circuit 25 outputs the report circuit trigger signal 23, and the report vibration circuit 3
2 is input. When the trigger signal 23 is input, the report vibration circuit 32 outputs the bimorph vibration signal 31 to the bimorph drive circuit 25 for a certain period of time, and vibrates the shutter drive bimorph 8. The vibration sound caused by the vibration allows the photographer to sense when the shutter has opened and closed.

In the above embodiment, the report circuit trigger signal 23 is output from the bimorph drive circuit, but it may be output directly from the camera control circuit 24 to the report vibration circuit 32.

Next, the operation of this embodiment will be explained. When a release switch (not shown) is turned on by pressing the shutter button, the camera control circuit 24 outputs a shutter open signal 21 that opens the shutter blades, and the shutter open signal 21 is input to the bimorph drive circuit 25. The bimorph drive circuit 25 outputs a drive current to the bimorph 8 and charges the bimorph. When a voltage is applied to the bimorph 8, as shown in FIG. 1, the bimorph 8 is distorted clockwise using the right end 8b as a fulcrum, the lever 5 is rotated about the shaft 6, and the rotation of the lever 5 causes the shutter blade 2.
3 in opposite directions to open the exposure opening 1c.

Figure 3 shows the time change in the voltage across the bimorph, to ~
During period t1, the shutter open signal is output from the camera control circuit 24, and the voltage increases linearly in the positive direction.The camera control circuit 24 calculates the exposure time according to the brightness of the subject, and then At time point 1, which is the exposure time, the camera control circuit 24 outputs a shutter close signal 22 to close the 1 m exposure IC with a shutter blade to the bimorph drive circuit 25. When the shutter close signal 22 is input, the bimorph drive circuit 25 applies a voltage between t1 and t2 to the bimorph 8. By applying a reverse voltage to the bimorph 8, the bimorph 8 is distorted counterclockwise with the right end 8b as a fulcrum in FIG.
are rotated about the shaft 6, the shutter blades 2.3 are rotated to their original positions, and the exposure aperture 1c is closed. The time required for the shutter to open varies depending on the shutter opening, but the time interval from t1 to t2 is set to be equal to or slightly longer than the time required to close the exposure aperture when the shutter opening is at its maximum. The shutter open signal 22 is input from the camera control circuit 24 to the bimorph drive circuit 25, and at time t2 when the input ends, the bimorph drive circuit 25 outputs the report circuit trigger signal 23 to the report vibration circuit 32. Or shutter close signal 2 from camera control circuit 24
The report circuit trigger signal 23 may be output to the report vibration circuit 32 after the output of the second report is completed. Report vibration circuit 3
2 is a reporting circuit. When a trigger signal is input, the reporting vibration circuit 32 operates for a certain period of time Ta (t2 to ts) in FIG.
After the elapse of time, the bimorph drive circuit 2 sends a bimorph vibration signal 31 that causes the bimorph 8 to vibrate for a certain period of time shown as Tb in FIG.
5, and the bimorph drive circuit 25 vibrates the bimorph 8 at a constant period Tc for a constant time.

The voltage applied to the bimorph 8 during this vibration is a negative voltage. This is because the shutter blades perform an opening operation when a positive voltage is applied to the bimorph 8, so the bimorph 8 is vibrated without affecting the opening/closing operation of the shutter blades at all.

Another embodiment for imparting vibration to the bimorph 8 is shown in FIG. In the above embodiment, when the bimorph vibrates, a voltage is applied in the negative voltage direction to cause the bimorph to vibrate in the shutter blade closing direction, but as shown in FIG. 4, -V1 [V] in the negative voltage direction and 10 V in the positive voltage direction. , [V].

This voltage application direction has the advantage of eliminating hysteresis in the positive and negative directions that occurs in the bimorph.

That is, bimorph hysteresis can be removed every time the shutter is released. However, the applied voltage of 10 V+ [V] during this vibration is set to such an extent that the amount of displacement of the bimorph affects the shutter blades and the shutter does not open. Further, although the voltage applied to the bimorph during vibration was a rectangular wave, the effect remains the same even if a sine wave is applied.

G. Effects According to the present invention, by generating a bimorph vibration sound after the shutter opening/closing operation is completed, the photographer can now intuitively grasp the completion of the shutter opening/closing operation, thereby alleviating the photographer's anxiety. By solving this problem, we were able to improve the usability of a camera equipped with a bimorph shutter.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the mechanism section of an embodiment of the present invention, FIG. 2 is a configuration diagram of the electric circuit section of the above embodiment, FIG. 3 is a diagram of the bimorph applied voltage signal of the above embodiment, and FIG. FIG. 7 is a diagram of another example of a bimorph applied voltage signal. 1... Shutter base plate, 1c... Exposure opening, 1d.
...Notch, 1e...hole, 1f...protrusion, 2,3.
...Shutter blade, 2a, 3a...long hole, 2b, 3
b... Notch opening, 4... Shaft, 5... Opening/closing lever, 5a, 5b... Bin, 6... Shaft, 7... Bimorph holding member, 7a, 7b... Bin , 8... Bimorph, 8a... Drive end portion, 8b... Fixed end portion, 9...
... Push plate, 10... Screw, 11.12... Electrode. Figure 3

Claims (1)

[Claims] In a shutter opening/closing device using a bimorph as a shutter driving source, an alternating current voltage generating means is provided to generate an alternating current voltage of a level that does not cause the shutter to open or close even if applied to the bimorph, and after the shutter opening/closing operation is completed, the alternating current from the alternating current voltage generating means is A shutter opening/closing completion notification device characterized in that a voltage is applied to the bimorph for a certain period of time to cause the bimorph to vibrate.