JPH02165781A - Electromagnetic-driven half-open type shutter - Google Patents

Abstract

PURPOSE:To accurately diaphragm in an appropriate manner even for CCD shutter photographing by stopping energizing for a motor interlocking with the output of a signal generating means accordant with the traveling position of a shutter vane at the time of a CCD shutter photographing mode. CONSTITUTION:In the case of the CCD shutter photographing, when the energizing for a motor 1 is stopped by a signal from a signal generating means 23 at a point where the apertures of shutter vanes 14 and 15 reach a prescribed stop value, since the motor 1 travels to some extent by inertia and stops after that, for the apertures of the shutter vanes 14 and 15, exposure accordant with the stopped stop value can be obtained. After that, a control magnet 18 is energized, and the shutter vanes 14 and 15 are closed. Thus, the CCD shutter photographing can be executed without closing the diaphragm apertures of the shutter vanes 14 and 15 and without performing a complicated operation during the CCD shutter photographing.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electromagnetically driven half-open shutter, particularly to a half-open shutter suitable for CCD shutter photography.

<Prior Art> In general, a half-open type shutter is configured to gradually open the shutter and then rapidly close after reaching a predetermined aperture value.

This is because the opening operation is slow in order to stabilize the exposure amount.
This is because the faster the closing action is, the more advantageous it is.

<Problems to be Solved by the Invention> However, in the case of normal automatic exposure (AE) photography, the above-mentioned means are desirable, but when photography is performed using the shutter function of the image sensor itself, that is, by using a CCD shutter. This causes inconvenience when photographing. The reason for this is that when shooting with a CCD shutter, the aperture value is determined based on the set shutter speed and the brightness of the subject, but as mentioned above, when the aperture changes over time, the aperture value is This is because it is difficult to maintain accuracy.

If an attempt is made to set the aperture value in accordance with the changing aperture value, extremely complicated calculations will be required.

In view of the problems of the prior art described above, the present invention provides a simple CCD
-, An object of the present invention is to provide a new electromagnetic drive half-open shutter suitable for i-yatta photography.

Means for Solving the Problems> In order to achieve the above object, the present invention provides an electromagnetic drive half-open type roller that opens the shutter blade in conjunction with the forward rotation of the motor and closes the shutter blade by the operation of a control electromagnet. , the control electromagnet operates in conjunction with the output from the signal generating means in mechanical shutter shooting mode, and the control electromagnet operates in conjunction with the output from the signal generating means in mechanical shutter shooting mode. It is configured so that the power to the motor is cut off in conjunction with the output of the signal generation means.Also, in the CCD shutter photography mode, the motor is configured to be cut off in conjunction with the output from the signal generation means. It may be configured such that the current is turned off in the reverse direction of time and then the current is turned off.

In the electromagnetically driven half-open shutter with the above configuration, when performing mechanical photography in normal automatic exposure, the shutter blades are opened by forward rotation of the motor, and when a predetermined aperture value is reached, the signal generating means is activated. By energizing the control magnet with a signal from the camera, the two shifter blades are closed and the exposure is completed.

Next, in the case of CCD shutter photography, when the aperture of the shutter blades reaches a predetermined aperture value, the power to the motor is cut off by a signal from the signal generating means.The motor runs for some distance due to inertia and then stops, so the shutter The amount of exposure corresponding to the aperture value at which the blade aperture is stopped can be obtained. Thereafter, the control magnet is energized to close the shutter blade.

By performing such control, the aperture aperture of the shutter blade does not change during CCD shutter photography, and CCD shutter photography can be performed without performing complicated calculations.

Furthermore, when taking CCD images, if the motor is reversely energized in response to a signal from the signal generating means when the shutter blade aperture reaches a predetermined aperture value, and the brake is applied, then the power is cut off, the shutter blade aperture is reliably set at the predetermined aperture value. It is possible to stop the exposure at an aperture p value of , and a very appropriate amount of exposure can be obtained.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 4.

First, FIG. 2 is a configuration diagram of this embodiment, in which 1 is a motor, and a pinion gear 2 directly connected to the rotating shaft of the motor is in mesh with a reduction gear 3. 4 are shafts 5 and 6 implanted in a frame (not shown)
The rack gear is guided by a small gear 3a that is coaxial with the reduction gear 3, and is biased toward the left in the figure by a return spring 7, and has a hole 4a at its left end. A clutch plate 8 is rotatably supported in a hole 4a of the rack gear 4, and one end 8a of the clutch plate 8 is connected to the control plate 1 by a clutch spring 9.
0, and has a convex portion 8b formed on its lower surface. The control plate 10 is rotatably supported by a frame (not shown) and is supported by a return spring 12.
It is biased clockwise as shown, and on its top surface,
A Q-Russ plate 11 is glued on the bottom surface of which a bottle 10b is placed symmetrically around the center of rotation.

10c is provided protrudingly. The e-rus plate 11 is arranged so that its light-transmitting portion crosses the photointerrazota 13.

Reference numerals 14 and 15 denote diaphragm blades which also serve as Nyatta blades and are slidable while being guided by shafts 16 and 17 installed in a frame body (not shown), and the control plate 10Ot y 10b
, 10c are fitted into elongated holes 14a, 15a, respectively, and have throttle openings 14b, 15b, respectively. 18 is an electromagnet consisting of a coil 18a and an armature 18b rotatably supported by a shaft 19;
When the armature 8a is energized, the armature 18b rotates in the counterclockwise direction shown in the figure, and one end 18b of the armature 18b rotates in the counterclockwise direction shown in the figure.

Press the convex portion 8b of the clutch plate 8 to release the clutch plate 8.
The one end 8a of the control plate 10 is disengaged from the gag 10a of the control plate 10.

The operation of this embodiment with the above configuration is shown in Figures 1(a) and 1(b).
) will be explained using the shutter running characteristic diagram.

First, in the case of normal mechanical shutter photography, after the release, when the motor 1 rotates clockwise and the reduction gear 3 rotates counterclockwise, the rack gear 4 slides to the right against the biasing force of the spring 7. Start.

Then, since the clutch plate 8 attached to the rack gear 4 also slides to the right, the pin 10a of the control plate 10 is pushed by one end 8a of the clutch plate 8, and the control plate 10 is returned by the biasing force of the spring 12. Rotate counterclockwise against pin 1.
Slide the diaphragm blade 14 to the left from 0bVc, slide the diaphragm blade 15 from the pin 10c to the right,
As shown in FIG. 1(a), the diaphragm opening gradually opens.

At the same time, the Q-rus plate 11 on the control board 10 also rotates counterclockwise, and the first and -r interface data 13 are rotated counterclockwise.
The number of transparent parts of 1 is counted, and when a predetermined number of 9 pulses Pfi is reached, the coil 18a of the electromagnet 18 is energized, and after a delay time TmO due to the operation of the electromagnet 18, the armature 18
b is sucked upward in the figure, and its one end 18b rotates the clutch plate 8 in the counterclockwise direction, and the clutch plate 8F) One end 8
Since the engagement between the pin 10a and the control plate 10 is released, the control plate 10 is rotated clockwise by the return spring 12.
The diaphragm blades 14 and 15, which also serve as shutters, close rapidly, completing the exposure.Then, the motor 1 rotates in reverse, and the rack gear 4 slides back to the left to return to its initial position. This completes the series of operations.

Next, regarding the case of CCD photography, when the motor 1 rotates clockwise after the release and the reduction gear 3 rotates counterclockwise, the rack gear 4 starts sliding to the right against the biasing force of the spring 7. .

Then, as described above, the clutch plate 8 attached to the clutch gear 4 also slides to the right, so one end 8a of the clutch plate 8 is also slid to the right.
Then, the bottle 10a of the control plate 10 is pushed, and the control plate 10 rotates counterclockwise against the biasing force of the return spring 12.
y 10b and 10c respectively aperture blades 14
．． 15 to open the diaphragm opening as shown in FIG. 1(b).

At the same time, the photointerrazotor 13 counts the light transmitting portion of the 9-lux plate 11 on the control board 10, and when the predetermined number of 9-luxes Pn is reached, the motor 1 is immediately turned off, but the coil of the electromagnet 18 18a is not energized immediately. Therefore, the motor 1 runs for a time Tsl due to inertia and then stops, and the diaphragm blades 14 and 15, which also serve as a shutter, stop at a predetermined position. Therefore, after the diaphragm blades 14 and 15 remain in a stopped state for the CCD shutter time Te1, the diaphragm blades 1 immediately
4. Electromagnet 1 after timer Tdl so that 15 is closed
When the coil 18a of No. 8 is energized, the shutter is closed after a time period of Td1+Tm has elapsed. After exposure, motor 1 rotates in reverse direction 1. Return rack gear 4 to its initial position.

FIG. 3 is a block diagram of an electric circuit for controlling the operation of this embodiment.

In the same figure, 20 is a control circuit, which is a mechanical shutter /C (
"T) Shutter switching circuit 21. Photometering circuit 22. Each signal from the release signal generation circuit 23 and the photo interlayer 13 of the shutter section is input, and the output signal is sent to the motor 1 of the shutter section via the motor drive circuit 24. and an electromagnet drive circuit 25f!: The electromagnets 18 of the shutter section are controlled to operate, respectively.

Next, the control operation will be explained using the flowchart shown in FIG.

First, in #1, it is determined whether the mode is mechanical shutter photography mode or CCD shutter photography mode. When in mechanical shutter shooting mode, metering is performed in #2, and the reference value is set according to the metered value in #3.
9. Calculate the russ number Pn. At this time, as shown in FIG.
The operation delay time T, the amount Δ by which the diaphragm overruns TI
Pn is determined by taking into account Pnx'Th. Then #
At #4, motor 1 is turned on, and at #5, the aperture blades are opened and the shutter is opened.At the same time, at #6, the Q pulse is counted, and at #7, it is counted. The Q Lus number is the reference Norse number P.

When this is reached, the electromagnet is energized in step #8, and the shutter is closed in step #9. Thereafter, at #10, the motor 1 is reversely rotated to return the rack gear 4 to its initial position, and the series of operations is completed.

Also, when #1 is in CCD shutter shooting mode, #11
First, manually set the shutter speed and set the aperture value accordingly. Then, in #12, the reference number Pn is determined according to the aperture value. At this time, as shown in Fig. 1fb), the amount ΔPn2 of the aperture overruns from when the motor 1 is turned off until it stops. Put-
decide.

Next, the motor 1 was turned on in #13, the shutter shutter was opened by the diaphragm blades 14 and 15 in #14, and at the same time, the number of pulses was counted in #15, which was counted in #16. 9
When the number of pulses reaches the reference/Q pulse number Ptl, the motor 1 is turned off in #17.

After this, the timing for energizing the electromagnet 18 is determined as follows. That is, the time T111 from turning off the motor 1 at #18 until the diaphragm stops is the CCD shutter time T at #19. 1. Based on the operation delay time Trrl of the electromagnet 18, the time Td1 from turning off the motor 1 to starting energizing the electromagnet 18 is Tai = (Tel + Tet) Tm
It is.

Therefore, after motor 1 is turned off, time Tax 'e is set at #20.
After that, the electromagnet 18 is energized in #21, the shutter is closed in #22, and the motor 1 is reversed in #23 to return to the initial state.

FIGS. 5 and 6 show other embodiments of the present invention. In order to simplify the explanation, only the points different from the previous embodiment will be explained.

In this embodiment, the motor is reversely energized for a short period of time before the energization to the motor is cut off so that the aperture blades can more quickly stop the iris during the CCD shutter photographing mode. The other configurations are completely the same as those of the previous embodiment.

FIG. 5 is a flowchart for the operation of this embodiment, and #31 to #40 in the mechanical shutter shooting mode and #41 to #46 in the CCD shutter shooting mode are #1 in the above embodiment.
It is similar to #10 and #11 to #16, but when the predetermined reference pulse number ptL shown in the shutter running characteristic diagram in FIG. After the current is applied in the direction, the current is cut off, and after the time Tl12 when the aperture stops at #48, the CCD shutter second time T is set at #49.
112 photographs are taken. Then, at #50, timer T
(After H2, when the electromagnet 18 is energized with #51, Ta
After the time of 2+ Tm has passed, the shutter closes at #52,
At #53, motor 1 is reversed and returns to the initial state.

In the case of this embodiment, the stopping accuracy is improved by the shorter time until the aperture stops.

FIG. 7 shows still another embodiment of the present invention, and shows a shutter running characteristic diagram thereof.

In each of the above embodiments, when the CCD shutter is photographed, the diaphragm blades and the diaphragm blades are interlocked. Even if you stop the motor and stop the throttling,
Since there may be cases where the aperture does not stop accurately at the desired aperture value, in this embodiment, after the aperture stops at L7'C, the aperture is stopped at C.
The CD shutter is operated for a time Te2 to expose the image sensor. Thereafter, this amount of light is compared with the standard exposure amount to determine whether it is too much or too little (7) The second electric shutter is operated for a time T.2 to optimize the exposure amount.

By operating the CCD shutter twice in this manner, the accuracy of the aperture value can be further improved.

<Effects of the Invention> As explained above, the present invention provides an electromagnetic drive half-open type shutter in which, in the CCD shutter photographing mode, the power to the motor is cut off in conjunction with the output of the signal generating means according to the traveling position of the shutter blade. By cutting off the current after reverse energization]
, it is possible to accurately adjust the aperture, which is also suitable for CCD shutter photography, without adding any special mechanism.

[Brief explanation of the drawing]

FIG. 1 is a shutter running characteristic diagram of an electromagnetically driven half-open shutter according to an embodiment of the present invention, (al indicates the time of mechanical shutter photography, and (b) shows the time of CCD shutter photography, respectively.
1. Fig. 2 is a schematic configuration diagram of the shutter section, Fig. 3 is a block diagram of an electric circuit for controlling the operation, Fig. 4 is a flowchart explaining the operation, and Fig. 5 is a diagram showing the structure of the shutter section. FIG. 6 is a shutter running characteristic diagram thereof, and FIG. 7 is a shutter running characteristic diagram according to still another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Motor, 4... Rack gear, 8... Clutch plate, 10... Control board, 11... No.9 Lux plate, 13
...Photo interrazota, 14.15...Aperture blade (also serves as shutter blade), 18...Electromagnet, 18a.
... Coil, 18b... Armature, 20... Control circuit, 21... Mechanical gloss/CCD gloss switching circuit, 22... Photometry circuit, 23... Release signal generation circuit, 24... Motor drive Circuit, 25... Electromagnet drive circuit. Figure (a) Ichinya Nta

Claims (1)

[Scope of Claims] 1. In an electromagnetic drive half-opening shutter in which the shutter blades are opened in conjunction with forward rotation of a motor and closed by the operation of a control electromagnet, a signal generation means according to the traveling position of the shutter blades. The control electromagnet is operated in conjunction with the output from the signal generating means in the mechanical shutter photographing mode, and the motor is energized in conjunction with the output of the signal generating means in the CCD shutter photographing mode. An electromagnetically driven half-open shutter characterized by being configured to be closed. 2. In an electromagnetic drive half-open type shutter in which the shutter blade is opened in conjunction with forward rotation of the motor and closed by the operation of a control electromagnet, the shutter blade has a signal generating means according to the traveling position of the shutter blade, and a mechanical type In shutter photography mode, the control electromagnet operates in conjunction with the output from the signal generation means, and in CCD shutter photography mode, the motor is energized in the reverse direction for a certain period of time in conjunction with the output from the signal generation means. An electromagnetically driven half-open shutter, characterized in that the electromagnetic drive half-open type shutter is configured such that the current is cut off after the energization is completed.