JPH032899Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a method for adjusting the seconds of an electronic shutter for cameras. More specifically, the seconds are controlled by two electromagnets: an electromagnet for opening control and an electromagnet for closing control. This invention relates to an electronic shutter for cameras that allows fine adjustment of the time.

Conventionally, in the method of adjusting the seconds in electronic shutters for cameras, in which the seconds are controlled using two electromagnets: an electromagnet for opening control and an electromagnet for closing control, adjustments are made by changing the spring force that separates the movable piece of iron from the electromagnet. However, as shutter speeds have increased in recent years, there has been a strong demand for a system that allows for fine adjustment in an analog manner. However, enabling fine adjustment leads to a reduction in the amount of adjustment, and it has been difficult to satisfy these requirements at the same time. For example, if an eccentric pin is used in the spring hook, reducing the amount of eccentricity will reduce the amount of adjustment that allows fine adjustment. If the amount of eccentricity is increased, the range of adjustment increases, but the adjustment amount for the rotation angle of the eccentric pin becomes extremely large at certain positions, which has the drawback of making fine adjustment difficult.

Taking the above points into consideration, the present invention is an electronic shutter for cameras that controls the time using two electromagnets: an electromagnet for opening control and an electromagnet for closing control. To provide an electronic shutter for a camera that can be easily removed and finely adjusted.

According to the invention, this objective is achieved as follows. Both the opening control side and the closing control side have an iron piece lever that pivotally supports a movable iron piece, and each is biased by a spring in a direction to separate the movable iron piece from the electromagnet. By changing the balance of this spring force, the balance of time from demagnetization of the electromagnet to the start of running of the sector changes, so that the time can be adjusted. In the above configuration, one of the opening side and closing side iron lever springs is roughly adjusted digitally using a ratchet, and then one is finely adjusted analogously using an eccentric pin. The adjustment amount is only one tooth of the ratchet, and the amount of eccentricity can be reduced, so the adjustment is easy. With the above configuration, the structure is simple and the time adjustment width is sufficient.
Moreover, fine adjustment is easily possible.

Next, an embodiment of the present invention will be explained with reference to figures. Fig. 1 shows the charging state of the shutter of the present invention;
Figure 2 shows the state before the electromagnet is demagnetized after release, and Figure 3 shows the state where the open control electromagnet is demagnetized.
FIG. 4 is a front view showing a state in which the closure control electromagnet has also been demagnetized and the operation has been completed. In FIG. 1, reference numeral 1 denotes a release lever, which has an arm portion 1a and a claw portion 1b, and is rotatably supported on a base plate by a shaft 2.
It is biased counterclockwise by a spring 3. 4 is a crimp lever with a bent part 4a, a pin part 4b, and an arm part 4c.
It is rotatably supported on the substrate by a shaft 5, and biased clockwise by a spring 6.
Reference numeral 7 denotes a pressure bonding plate having arm portions 7a and 7b, and is rotatably supported on the pressure bonding lever 4 by a shaft 8. 9 is the iron piece lever on the open side, and the pin parts 9a, 9
b, 9c has arm portions 9d, is rotatably supported on the board by a shaft 10, and has an open side iron piece lever spring 11.
is biased clockwise by. 12 is a closing side iron piece lever with pin parts 12a, 12b, 12c,
It has an arm portion 12d, is rotatably supported on the base plate by a shaft 13, and is biased counterclockwise by a closing side iron lever spring 14. Reference numeral 15 denotes an open side movable iron piece, which is rotatably supported on the open side iron piece lever 9 by a shaft 16, and its rotation is restricted by pin parts 9b and 9c. Reference numeral 17 denotes a closing side movable iron piece, which is rotatably supported on the closing side iron piece lever 12 by a shaft 18, and includes a pin portion 12b,
12c restricts its rotation. 19
is a ratchet gear rotatably supported on the base plate by a shaft 10. Reference numeral 20 is fixed to a fixing member (not shown) with a ratchet pawl. Reference numeral 21 denotes an eccentric pin having a pin portion 21a, and is rotatably supported by a shaft 22 on a fixed member (not shown) with a friction that is such that it cannot be moved by at least the torque of the closing side iron lever spring 14. 23 is an iron core. _M1 is an electromagnet for opening control. M ₂ is a closure control electromagnet.

To explain the operation of the device with the above configuration, when the release lever 1 is pushed down in the direction of the arrow from the charge state shown in FIG. When the lever 4 is disengaged from the bent portion 4a, a switch (not shown) opens the control circuit as a star and energizes the electromagnets M ₁ and M ₂ for controlling the closing. When the crimp lever 4, which holds the opening side and closing side iron levers 9 and 12 through the crimp plate 7, is disengaged from the release lever 1, the crimp lever 4 is released by a locking pin (not shown) by a spring 6. Rotate clockwise until the opening and closing side iron levers 9, 12 are released. At this time, the opening side and closing side movable iron pieces 15 and 17 are attracted to the iron core 23, so the opening side and closing side iron piece lever 9,
12 is prevented from rotating. This state is shown in FIG. Starting the control circuit activates a delay circuit which generates pulses after the state of FIG. 2. On the other hand, the pulse generation circuit also starts, and the pulse time is determined based on the field information and camera side information. After the delay time by the delay circuit has elapsed, a demagnetizing signal for the opening control electromagnet _M1 is outputted after the state shown in FIG. 2 has elapsed, and a demagnetizing signal for the closing control electromagnet _M2 is outputted after the pulse time has elapsed. By demagnetizing the opening control electromagnet M ₁ , the adsorption between the iron core 23 and the opening side movable iron piece 15 is released, and the opening side iron piece lever 9 is released.
is rotated clockwise by the bias of the spring 11 until the degree is determined by a degree pin (not shown). At this time, the pin portion 9a comes into contact with a leading pawl (not shown) that locks the leading sector drive lever (not shown), rotates the leading pawl, and releases the lock from the leading sector driving lever, so that the leading sector does not travel. Start and exposure begins. The state at this time is shown in FIG. By demagnetizing the closure control electromagnet _M2 , the adsorption between the iron core 23 and the closing side movable iron piece 17 is released, and the closing side iron piece lever 12 is moved counterclockwise by the bias of the spring 14 (not shown). Rotate until the degree is determined by the degree pin. Then, by the same mechanism as on the open side, the rear sector starts traveling and the exposure ends. This state is shown in FIG. After the state shown in FIG. 4, a shutter charge is performed by a set mechanism (not shown), and a set lever (not shown) contacts the pin portion 4b of the crimp lever 4 to rotate the crimp lever 4 counterclockwise. Therefore, the crimp plate 7 comes into contact with the opening side and closing side movable iron pieces 15 and 17, and the opening and closing side iron piece levers 9 and 12 rotate in the suction direction, and the iron core 23 comes into contact with the opening side and closing side movable iron pieces. The iron piece is crimped. At the same time, the crimp lever 4
engages with the release lever 1 to hold the opening side and closing side iron levers in a crimped state. In this state, the state shown in FIG. 1 is restored.

Next, to explain the amount of adjustment of the seconds according to the present invention, by changing the balance of torque between the opening side iron piece lever spring 11 and the closing side iron piece lever spring, the electromagnet is demagnetized and then the claw that locks the sector drive lever is rotated. Since the balance of the time taken to start is changed, it is possible to adjust the seconds. In FIG. 1, the opening-side iron lever spring 11 is roughly adjusted digitally using a ratchet gear 19, and the closing-side iron lever spring 14 is finely adjusted analogously using an eccentric pin 21. The amount of adjustment of the eccentric pin 21 includes at least the amount of adjustment of the ratchet 19.
The adjustment amount for one tooth is sufficient. In this embodiment, the mechanism in which the iron piece lever releases the engagement between the locking pawl and the sector drive lever has been described, but when the iron piece lever also serves as the locking pawl, or when the iron piece lever directly drives the sector, It can also be used in According to the above configuration, it is possible to finely adjust one pitch that cannot be adjusted by adjusting the digital amount for each pitch with the ratchet gear, using an analog amount using the eccentric pin. In addition to being able to make fine adjustments by adjusting the angle of rotation of the eccentric pin, the amount of adjustment to the rotation angle of the eccentric pin can be made very small, making it easy to make fine adjustments.

[Brief explanation of drawings]

Figure 1 shows the charging state of the shutter of the present invention, Figure 2 shows the state before the electromagnet is demagnetized after release.
Figure 3 shows the state where the open control electromagnet is demagnetized, and the fourth
The figure is a front view showing a state in which the closure control electromagnet has also been demagnetized and the operation has been completed. In the figure, 1... Release lever, 4... Crimp lever, 7... Crimp plate, 9... Opening side iron piece lever, 11... Opening side iron piece lever spring, 12... Closing side iron piece lever, 14... Closing side Iron piece lever spring, 15... Opening side movable iron piece, 17... Closing side movable iron piece, 19... Ratchet gear, 20... Ratchet claw, 21... Eccentric pin, 23... Iron core,
M ₁ ... indicates an electromagnet for opening control, M ₂ ... indicates an electromagnet for closing control.

Claims (1)

[Scope of utility model registration request] an opening control electromagnet for controlling the start of running of the open blades, a closing control electromagnet for controlling the start of running of the closed blades, and an open side that is attracted and held by the electromagnets and detached by demagnetization;
a closing-side movable iron piece; an opening-side and closing-side iron piece lever that operates integrally with the opening side and closing side movable iron piece to start the travel of the blade; and the opening side;
An opening-side and closing-side iron lever spring that acts in a direction to pull the closing-side movable iron piece away from both electromagnets, a ratchet gear for adjusting the spring torque of one of the opening-side and closing-side iron lever springs, and a ratchet gear for adjusting the spring torque of the other. and a ratchet claw for locking the ratchet gear, the ratchet gear roughly adjusts the spring torque of one of the opening side and closing side iron piece lever springs with a digital amount, and the spring torque of the other spring with an analog amount. A second time adjustment method for an electronic shutter for a camera, characterized in that the second time of the shutter as a whole can be finely adjusted in an analog amount by fine adjustment.