JPS6326813Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a so-called electromagnetic shutter device that uses an electromagnetic device such as a solenoid to open and close a shutter member in an optical device such as a camera.

Conventionally, various electromagnetic shutter devices are known, as shown in FIGS. 1a to 1c.

However, in any of the above-mentioned electromagnetic shutter devices, a driving member such as a plunger, which is displaced by the operation of an electromagnetic device such as a solenoid, is connected so as to directly act on the shutter blade or the shutter blade that also serves as an diaphragm of the shutter member. Since the structure is such that the displacement operation of the drive member is directly involved in the opening/closing operation of the shutter member, the influence of gravity on the displacement operation of the drive member may occur, for example, when a camera or the like is tilted at 90 degrees from its normal posture when taking pictures. As a result, the shutter speed becomes unstable in the electromagnetic shutter device shown in FIGS. 1a and b, and the shutter speed becomes unstable as in the electromagnetic shutter device shown in FIG. The so-called guillotine-type shutter structure, in which exposure is controlled by the opening formed by the pair of shutter members by directly driving displacement in opposite directions by the drive members of the electromagnetic device, is also affected by gravity. In addition, the shutter speed becomes unstable as described above because the displacement speed of the shutter blade on the side that is displacing in the opposite direction is slower than that of the other shutter blade, and in addition, the center of the opening is the shooting hole formed in the shutter board. Due to the attitude difference due to the attitude state of the electromagnetic device, such as the exposure amount changing due to the opening being kicked by the shutter board due to the relative positional relationship with the photographing hole of the shutter board. However, due to variations in exposure conditions, it was not possible to always take pictures with proper exposure.

The present invention has been made in consideration of the above, and its main object is to provide an electromagnetic shutter device which can offset the effects of gravity caused by changes in the position of the device, is compact in size, and allows the shutter to be opened and closed smoothly without any irregularities in operation when the shutter is started.

To achieve this objective, the present invention consists of an electromagnetic device consisting of a hollow cylindrical excitation coil and a pair of drive members housed within the excitation coil and sliding in opposite directions. two driving force transmitting members, one end of which is connected to the member and the tip of the other end displacing in the same direction; and a shutter opening/closing member that is movable in one direction by these two driving force transmitting members and is connected to the shutter member. , and a connecting member provided on the shutter opening/closing member to restrain the respective moving directions of the two driving force transmitting members from each other.

The present invention will be described in detail below based on one embodiment of the present invention shown in Figs.

First, its structure will be explained. In the figure, reference numeral 10 denotes an electromagnetic device such as a solenoid, which includes a coil 12 wound around a coil frame 11 and two devices inserted into an inner hole of the coil frame 11 and displaced close to each other in opposite directions by the excitation of the coil 12. It consists of driving members 13 and 14 such as plungers. 20 and 30 are driving force transmitting members, respectively, and the two driving members 13,
Recesses 21 and 31 connected to the pins 15 and 16 implanted in the shutter board 60 and elongated holes 22 and 32 are respectively formed at the other end, and the shafts 61 and 62 implanted in the shutter board 60 etc. are used as fulcrums. Rotatably supported.
Reference numeral 40 denotes a shutter opening/closing member, which includes a pin 41 that fits into the elongated holes 22 and 32 of the two driving force transmitting members 20 and 30 and is displaced by the correlated displacement of the two driving force transmitting members, and a shutter board 60. axis 6 on the back side of
A pin 44, which fits into the elongated holes 51 and 52 of a shutter member 50 such as a shutter blade or a shutter blade that also serves as an diaphragm and is rotatably supported around fulcrums 5 and 66 and drives the shutter member 50 to open and close, is implanted. ,or,
It is slidably supported by shafts 63 and 64 formed with elongated holes 42 and 43 and implanted in the shutter base plate 60, etc., and furthermore, the shutter is constantly displaced in the right direction by the biasing force of a spring 45. While maintaining the member 50 in a closed state, the two driving members 1 are transmitted via the two driving force transmitting members 20 and 30.
3 and 14 are respectively configured to maintain them in a spaced state.

Next, a series of shutter operations will be explained.

First, an exposure control circuit (not shown) is activated by the release operation of a camera, etc., and the coil 12 of the electromagnetic device 10 is activated.
is excited, the two drive members 13 and 14 are attracted, and are displaced in opposite directions against the biasing force of the spring 45 of the shutter opening/closing member 40 and come close to each other. At this time, if the electromagnetic device 10 is in the posture shown in the figure, it will naturally be affected by gravity, but the lengths of the two driving force transmitting members 20 and 30 connected to these two driving members 13 and 14 Since the holes 22 and 32 are both fitted with the pin 41 of the shutter opening/closing member 40, and the two driving force transmitting members 20 and 30 always rotate at the same speed, the two driving members 13 and 14 are not affected by the influence of gravity. cancel each other out and approach each other at the same displacement speed. The two driving force transmitting members 20, 30 are displaced at the same speed due to the close displacement of the two driving members 13, 14, and this correlated displacement causes the pin 41 of the shutter opening/closing member 40 to spring in the left direction. The pin 44 of the shutter opening/closing member 40 opens the shutter member 50 and exposes the shutter by moving the shutter opening/closing member 40 to the left. After the appropriate exposure time, the exposure control circuit operates to cut off the current supply to the coil 12 of the electromagnetic device 10, thereby eliminating the attraction action of the two drive members 13, 14. are separated by the biasing force of the spring 45 of the shutter opening/closing member 40, and the shutter opening/closing member 40 returns to the left due to the biasing force of the spring 45, and the pin 44 of the shutter opening/closing member 40 pushes the shutter member 50. A series of exposure control operations is performed by completing the closed exposure.

As described above, according to the present invention, a pair of drive members housed in an excitation coil of an electromagnetic device and sliding in mutually opposite directions have two drive force transmissions connected at one end and displacing the tip of the other end in the same direction. a shutter opening/closing member that is movable in one direction and connected to the shutter member by the two driving force transmission members;
By constructing the shutter opening/closing member with a connecting member that restrains the respective moving directions of the two driving force transmitting members, the influence of gravity due to the difference in the posture of the device can be canceled out, and the device can be moved freely in one direction. By using the shutter opening/closing member, the degree of freedom is increased in the arrangement of the electromagnetic device with respect to the shutter member, and the device can be made smaller.

Furthermore, the electromagnetic device is equipped with a hollow cylindrical excitation coil,
By configuring this excitation coil with a pair of drive members that slide in opposite directions, the excitation of the excitation coil ensures that the pair of drive members are synchronized and displaced, so the shutter operates when the shutter is started. The shutter can be opened and closed smoothly without any unevenness.

[Brief explanation of the drawing]

1A to 1C all show conventional electromagnetic shutter devices, FIG. 2 shows an embodiment of the electromagnetic shutter device of the present invention, and FIG. 3 shows a view of FIG. 2 from the back. be. In the figure, 10...electromagnetic device, 12...coil, 1
3, 14... Drive member, 20, 30... Driving force transmission member, 40... Shutter opening/closing member, 50... Shutter member.

Claims (1)

[Scope of Claim for Utility Model Registration] An electromagnetic shutter device comprising a shutter member for opening and closing an optical axis aperture, and an electromagnetic device for driving the shutter member to open and close, the electromagnetic device having a hollow cylindrical excitation coil, It consists of a pair of drive members that are housed within this excitation coil and slide in opposite directions to each other, and two drive forces are generated in which one end of the base end is connected to the pair of drive members and the other end of the drive member displaces in the same direction. a transmission member; a shutter opening/closing member which is movable in one direction by the two driving force transmitting members and connected to the shutter member; and each moving direction of the two driving force transmitting members provided on the shutter opening/closing member. An electromagnetic shutter device consisting of a connecting member that restrains each other.