JPS62223736A - Electromagnetic driving shutter - Google Patents

Abstract

PURPOSE:To stabilize an exposing time with simple constitution by applying driving force in the setting direction to an electromagnetic driving device at the 1st releasing stage and temporarily holding a shutter blade at a prescribed start position. CONSTITUTION:When a release switch SW is turned to an S terminal of an FF, the output Q of the FF is turned to 'H' and a transistor(TR) T12 is connected. Simultaneously, the output of an OR gate ORG1 is turned to 'H' by the leading edge of an output signal of an one-shot multi-OSM1, TRs T2, T3 are connected through an inverter and the driving force in the setting direction is applied to an opening blade driving source 2. An abutting pin fitted to the tip part of an arm fixed on a driving shaft of the driving source 2 is abutted against an opening blade position regulating member, the blade is rotated up to the start position and driving force in an exposure working direction is applied to the driving source 2 on the basis of the trailing edge of the output of the OSM1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetic drive shank that uses an electromagnetic drive device to drive open blade groups and closed blade groups.

[Conventional technology]

In recent years, cameras have become increasingly electronic, and functions such as exposure control, charging of the film winding mechanism, and operation of the mirror mechanism have come to be handled electrically. However, since conventional shutters use springs as the drive source for the shutter blades, a mechanical linkage mechanism and a large amount of electrical energy are required to charge the shutter, which is a major disadvantage for electrically controlled cameras. was. Therefore, an electromagnetic drive shutter has been proposed and is well known, in which the shutter does not have a mechanical connection mechanism with the camera body and is controlled only by electrical signals, thereby saving power.

[Problem that the invention seeks to solve]

However, the conventional ffi iff drive shutter described above is not designed to temporarily hold the shutter blade on the start side, so the start position of the shutter blade during exposure operation, which is an important element in controlling the exposure time, is There was a problem in that it was not stable and caused irregularities in exposure time.

So what about shutter blades? A configuration in which it is temporarily held at the starting position using an IT magnet or a combination type magnet has been considered, but in this case, the structure is complicated and expensive in terms of the number and type of components, and it is not always possible to save energy. It was not a desirable configuration.

SUMMARY OF THE INVENTION The present invention addresses the above-mentioned problems and aims to provide an electromagnetic drive shutter with a simple and power-saving structure and stable exposure time.

Means and operation for solving problem C] The electromagnetic drive shutter according to the present invention uses an electromagnetic drive device to drive an opening blade group and a closing blade group. Applying a driving force in the center direction to the drive device to bring the blade drive member into contact with the position regulating member, and applying a driving force in the exposure operation direction to the electromagnetic drive device in the second stage of release, using an electromagnet or the like. This is to stabilize the start position of the shutter blade during exposure operation without causing any problems.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to an illustrated embodiment.

FIG. 1 shows the configuration of the main parts of the shutter of the present invention,
1 is a shutter plate having an aperture 1a, 2 is an open blade drive source such as a motor fixed to the Nyanotar plate 1, and 3 is a group of open blades whose base is fixed to the drive shaft of the open blade drive tA2 and whose tip is a group of open blades. This is an open blade drive member to which an open pin 3a connected to one of the four support arms 5.5 and an engagement pin 3b that can engage with a position regulating member described later are fixed. Reference numeral 6 denotes an open blade position regulating member mounted on the shutter plate 1 so that its position can be adjusted by a shaft 7 and an optical adjustment eccentric shaft 8.

Reference numeral 9 denotes a closing blade drive source such as a motor fixed to the shutter plate l, and 10 has a base fixed to the drive shaft of the closing blade driving source 9 and is connected to one of the support arms of the closing blade group (not shown) at the tip. This is a closing blade driving member to which a closing pin 10a and an engaging pin tab that can be engaged with a position regulating member described later are fixed. 11 is the shaft 12 and the post-adjustment eccentric shaft 1
3 is a closing blade position regulating member attached to the shutter plate 1, 1 so as to be adjustable in position.

In addition, both of the above-mentioned repositioning regulating members may be fixed types, or
Only one side may be adjustable. Further, the blade driving source may be a direct type or a linear motor type that does not require a driving member.

FIG. 2 shows the control circuit of the above embodiment, SW is a release switch, FF is a flip-flop, 03M, .
05M2, 03M, one shot multi, ORG,
, 0RG2 is OR gate, N0RG is Noah gate, 14
is an exposure time control circuit, 15 is a shack set circuit, T1
T to T are transistors, and E is a power supply.

Since the electromagnetic drive shutter according to the present invention is constructed as described above, the operating principle will be explained with reference to FIG. 3 showing changes in the operating state of each member and FIG. 4 showing the operating sequence. Release switch SW
When the contact piece of the flip-flop FF is switched from the reset terminal R to the set terminal S, the output Q of the flip-flop FF becomes rHJ, and the transistor T becomes conductive. At the same time, the one-shot multi-O3M emits output,
Due to the rise of the output signal, the output of the OR gate ORG becomes "I("), and the output of the OR gate becomes "I("), and the
2 and T3 are electrically connected, a driving force in the setting direction is applied to the opening blade drive tA2, and as shown in FIG. The robot is rotated to the right until it reaches the starting position.

On the other hand, at the same time as above, the output Q of the flip-flop FF is r
Since the output of the exposure time control circuit 14 is "L" in the initial state, the output of the NOR gate N0RG becomes rHJ.
(or game) The output of ORG2 becomes "I", and it is connected to transistor T via an inverter. , T, are applied to the closing blade drive source 9 through W, and a driving force in the seven-node direction is applied,
Closed 11"I blade drive 1J member 10 is connected to its engagement pin 10b
The closing wing F is rotated to the right to a position where it comes into contact with the position regulating member 11 and is regulated, that is, a starting position.

Next, due to the fall of the output signal of the one-shot multi 08M1, the output of the OR gate ○RG1 becomes "L", and this time, the transistors T a and T s are connected via the inverter.
conducts, a driving force in the exposure operation direction is applied to the closed blade F11 drive source 2, the open blade drive member 3 rotates to the left, the open blade group 4 retreats from the I-most shadow optical path, and exposure is started.

At the same time, the exposure time control circuit I4 starts measuring time, and after a predetermined period of time has elapsed, its output becomes rHJ. Then, the transistors T, . The light path is covered and exposure is completed.

Also, when the output of the exposure time control circuit 14 becomes "H" and becomes rLJ via the inverter, the output of the one-shot multi-O3M becomes rHJ after a predetermined delay time in the shack set circuit 15, and a constant The output of one-shot multi-OS M z becomes "Tr" with a time difference.
becomes. When the output of the one-shot multi○SM2 becomes rHJ, the output of the OR gate○RG becomes "I", so the transistors Tz and Ts become conductive via the inverter, and the open blade drive source 2 operates in the cent direction. The open blade group 4 returns to the state covering the photographing optical path. After that, when the output of one-shot multi O3M becomes "1[", OR gate O
Since the output of RG z becomes rHJ, the transistors T, , T, become conductive via the inverter, and the closing blade group retreats from the photographing optical path. Thus, the cent ends.

The operating principle of the electromagnetically driven shutter of the present invention has been explained above.The electromagnetically driven shutter of the present invention applies a driving force in the center direction to the electromagnetic drive device in the first stage of release to position the blade driving member. Since it is brought into contact with the member, the starting position of the shank and blade during exposure operation is stabilized, and as a result, the exposure time is stabilized. However, 7ri
Since there is no need to use a magnet or the like, the structure is simple and power-saving.

Furthermore, since the start position can be adjusted by adjusting the position of the position regulating member, an exposure time of -5 items can be obtained.

〔Effect of the invention〕

As described above, the electromagnetically driven shutter according to the present invention has the important practical advantages of a simple and power-saving structure and stable exposure time.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the configuration of essential parts of an embodiment of an electromagnetically driven shutter according to the present invention, Fig. 2 is a diagram showing a control circuit of the above embodiment, and Fig. 3 is an operating state of each member of the above embodiment. FIG. 4 is a diagram showing the operation sequence of the above embodiment. DESCRIPTION OF SYMBOLS 1... Shutter plate, 2... Opening blade drive source, 3... Opening blade driving member, 4... Opening blade group, 5... Support arm, 6... Opening blade position regulating member, 7... shaft, 8... tip adjustment eccentric shaft, 9
... Closing blade drive source, 10... Closing blade driving member, 11... Closing blade position regulating member, 12...,
Axis, 13. . ...Post-adjustment eccentric axis, 14...Exposure time control circuit, 1
5...Shack set circuit, SW,..., release switch, FF...flip-flop, 03M,
. OS Mz, OS Mx...One shot multi, ORC,, ORC2...Or gate, NO
R.G. ...Nor gate, TI to T, ...transistor,
E...Power supply. Figure 3

Claims (1)

[Claims] In an electromagnetic drive shutter that uses an electromagnetic drive device to drive an open blade group and a closed blade group, in the first stage of release, a driving force in the set direction is applied to the electromagnetic drive device to bring the blade drive member into contact with the position regulating member. An electromagnetically driven shutter characterized in that a driving force in an exposure operation direction is applied to an electromagnetic driving device at the second stage of release.