KR100205985B1 - Electronic shutter of camera - Google Patents

Abstract

Sector drive in which the auto exposure meter rotates forward or reverse according to the direction in which the current is applied so as to be started even at low starting torque, and the rotating member rotated by the auto exposure meter and a sector pin geared to the rotating member and coupled to the sector. In the electronic shutter including an elastic member for applying a force to the member and the rotating member in the direction of closing or opening the sector, the auto-exposure meter is fixed to the shutter base, and rotatably mounted to the body in the direction of opening the sector. A driving pin for rotating the rotating member is formed, and a permanent magnet of a cylindrical shape in which the Y pole and the S pole are formed in a semicircular shape, a coil wound around the body so as to surround the permanent magnet in a radial direction, an m case installed on the body, and a case In addition, a balance plate installed at a predetermined size in a portion corresponding to the open or closed side of the sector Also it provides electronic shutter.

Description

Electronic shutter of camera

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic shutter, and more particularly, to an electronic shutter provided with a balance plate on a part of an open side or a closed side of an automatic exposure meter for proper balance of operating torque.

In general, the camera's electronic shutter controls autofocus for directing the focusing lens as far as the distance from the subject and autoexposure for controlling the combination of the aperture and shutter speed for the appropriate exposure of the subject. It is configured to perform sequential and automatic.

As shown in FIGS. 7 to 9, the electronic shutter configured as described above includes a rotor 2 which is a four-pole permanent magnet, a drive gear 4 integrally formed with the rotor 2, and a pair of stators ( 6) a reduction gear group consisting of a plurality of second gears (12), (14), (16) coupled with the drive gear (4) of the power source described above and rotating and decelerating a rotational force ( 10), the focus control ring 20 is coupled to the second gear 16 of the reduction gear group 10 and rotated and the inner circumferential surface is formed with a helicoid coupled to the lens holder 1, and the focus control A photointerrupter 30 for detecting the position of the ring 20 and an automatic exposure control device 40 for opening and closing the pair of sectors 8.

The automatic exposure control device 40 is rotated by the automatic exposure meter 50 (auto exposure meter) that rotates forward or reverse in accordance with the direction in which the current is applied, and rotates by the automatic exposure meter 50 and the outer peripheral surface portion A sector pin having a rotary member 42 having a gear 43 formed thereon, and a gear 47 engaged with the gear 43 formed at the rotary member 42 formed at one end surface and being coupled to the sector 8. A sector driving member 46 on which the 48 is formed, and an elastic member 58 which always applies a force in a predetermined direction to the rotating member 42.

8 and 10 to 12, the automatic exposure meter 50 is installed rotatably on the body 51 and the body 51 fixed to the shutter base (not shown). And a drive pin 54 for rotating the rotary member 42 and a commutator 52 formed of a permanent magnet 53 having a cylindrical shape in which a negative pole (N pole) and an S pole (S pole) are formed in a semicircular shape. The coil 56 wound around the body 51 to surround the commutator 52 in a radial direction, and a case 55 surrounding the body 51.

In the rotating member 42 is further formed a locking projection 44 is applied to the drive pin 54, one end of the elastic member 58 made of a torsion spring is fixed to the fixing projection (59). .

In the electronic shutter configured as described above, when the user presses the shutter release button, the rotor 2 is rotated by applying a voltage to the stator 6 of the power source with a predetermined pulse, and the rotor 2 is rotated. As the rotation of the drive gear 4 is rotated to rotate the focusing ring 20 through the reduction gear group 10 to perform the automatic focusing control to direct the focusing lens by the distance measured.

When the automatic focus adjustment is performed as described above, a predetermined voltage is then applied to the coil 56 constituting the automatic exposure meter 50 of the automatic exposure control device 40, and thus the commutator ( 52 rotates and the drive pin 54 formed in the commutator 52 rotates clockwise as seen in FIG.

When the driving pin 54 rotates in the clockwise direction as described above, the torque greater than the spring torque of the torsion spring, which is the elastic member 58, is applied to the driving pin 54 as described above. The rotating member 42 rotates clockwise, the sector driving member 46 geared to the rotating member 42 rotates counterclockwise, and the sector pins formed on the sector driving member 46 ( 48, the pair of sectors 8 rotate from the closed state (indicated by the solid line in FIG. 9) to the open state (indicated by the double-dotted line in FIG. 9).

When the voltage applied to the coil 56 of the automatic exposure meter 50 is turned off in the above state, the driving pin 54 is disposed between the permanent magnet 53 and the meter case 55. The holding torque is applied by the magnetic force and the position is fixed in the open state. At this time, the holding pin (magnetic force of the permanent magnet) must be set larger than the spring torque of the elastic member 58, so that the driving pin 54 overcomes the elastic force of the elastic member 58 and the sector 8 is opened. Can be maintained.

Particularly, in the case of taking a bulb shutter, the magnetic force of the permanent magnet 53 is set to represent a holding torque of a certain enough size because the sector 8 needs to be maintained for a certain time in the open state.

When the predetermined exposure is made, the reverse voltage is applied to the coil 56 of the automatic exposure meter 50 to actuate the operating torque in the counterclockwise direction to the driving pin 54 as shown in FIG. . At this time, as the predetermined reverse voltage is applied to the coil 56, the magnitude of the operating torque acting on the driving pin 54 should be larger than the magnitude of the holding torque by the permanent magnet 53.

As described above, when the operating torque is applied to the drive pin 54 in the counterclockwise direction and the drive pin 54 is rotated in the counterclockwise direction, the rotating member 42 is formed by the elastic member 58. An elastic force is applied to rotate in the counterclockwise direction, and the sector driving member 46 geared to the rotating member 42 rotates in a clockwise direction, and the sector pins formed in the sector driving member 46 ( 48), the pair of sectors 8 rotate from the open state (indicated by the dashed line in FIG. 9) to the closed state (indicated by the solid line in FIG. 9).

Another example of the automatic exposure meter 50 is, as shown in Figure 13, in order to increase the holding torque by the permanent magnet 53, the balance plate 57 is further installed in the meter case 55 It is.

If the balance plate 57 is installed in addition to the case 55 as described above, the holding torque due to the magnetic force of the permanent magnet 53 is relatively greater than that of the case 55 only. It is possible to set the magnetic force of the permanent magnet 53 smaller.

FIG. 14 shows the permanent magnet 53 and the meter case 55 of the automatic exposure meter 50 when the sector 8 moves from the open state to the closed state in the electronic shutter configured as shown in FIG. The change in the holding torque and the spring torque caused by the elastic member 58 are shown.

As shown in FIG. 14, the holding torque is the same size in the open side and the close side, and in the middle state, the boundary between the negative pole and the south pole of the permanent magnet 53 is located perpendicular to the case 55 and applied to the case 55. Since the magnetic force of the permanent magnet 53 maintains the smallest state, it changes into a curve that decreases toward the middle, and the spring torque is the smallest in the closed state and the largest in the open state. It changes to a straight line that gets smaller toward the closing side.

Since the holding torque is always set to be larger than the spring torque, when the holding torque and the spring torque are determined in the intermediate state when the holding torque is the smallest, the holding torque is the largest and the spring torque is the smallest on the closing side. The difference between the torque and the spring torque is large. That is, when the difference between the holding torque and the spring torque is small and large, the deviation is large (E " F).

FIG. 15 illustrates an electronic shutter configured to close the sector 8 by the driving force of the automatic exposure meter 50 and open the sector 8 by the elastic force of the elastic member 58 unlike FIG. 7.

As shown in FIG. 15, another example of the electronic shutter includes the rotating member 42 such that the driving pin 54 of the automatic exposure meter 50 rotates the rotating member 42 counterclockwise. It is installed to be caught on the right side of the locking projection 44, and the elastic member 58 made of a torsion spring is installed to rotate the sector drive member 46 in the counterclockwise direction.

Also in the other example of the above-mentioned electronic shutter shown in FIG. 15, it has the structure similar to the example of the electronic shutter shown in FIG.

FIG. 16 shows the permanent magnet 53 and the meter case 55 of the automatic exposure meter 50 when the sector 8 moves from the open state to the closed state in the electronic shutter configured as shown in FIG. The change in the holding torque and the spring torque caused by the elastic member 58 are shown.

As shown in FIG. 16, the holding torque is changed to the same curve as in FIG. 14, and the spring torque is closed in the open side unlike in FIG. 14 because the spring force is the smallest in the open state and the largest in the closed state. It changes in a straight line that increases toward the side.

Since the holding torque is always set to be larger than the spring torque, when the holding torque and the spring torque are determined in the intermediate state when the holding torque is the smallest, the holding torque is the largest on the open side and the spring torque is the smallest. The difference between the torque and the spring torque is large. In other words, the deviation between the holding torque and the spring torque is small and large is large (G < H).

According to the conventional electronic shutter configured as described above, since the deviation of the holding torque by the permanent magnet 53 of the automatic exposure meter 50 and the spring torque by the elastic member 58 is large, in order to stabilize the holding torque If the holding torque is set on the basis of the small difference between the holding torque and the spring torque (E, G), the coil is operated to operate the auto exposure meter 50 when the difference between the holding torque and the spring torque is large (F, H). There is a problem that the starting voltage applied to (56) must be high. That is, a large starting torque is required in the automatic exposure meter 50.

An object of the present invention is to solve the above problems, by installing a balance plate only on a part of the body of the automatic exposure meter, that is, the open side or the closed side to reduce the deviation of the difference between the holding torque and the spring torque to reduce the starting torque To provide a shutter.

The electronic shutter of the present invention includes an automatic exposure meter that rotates forward or reversely according to a direction in which a current is applied, a rotating member that is rotated by the automatic exposure meter, and a gear is formed on a part of an outer circumferential surface thereof, and formed in the rotating member. A sector driving member having a gear engaged with the gear and having a sector pin coupled to the sector, and an elastic member for applying a force to the rotating member in a direction of closing the sector; A body fixed to the shutter base and a driving pin rotatably installed on the body and rotating the rotating member in a direction of opening the sector are formed, and the negative pole (N pole) and the south pole (S pole) are formed in a semicircular shape. A cylindrical permanent magnet, a coil wound around the body to surround the permanent magnet in a radial direction, a meter case installed on the body, and the By the way, the emitter casing comprises a balance plate, which is installed to a predetermined size in the region corresponding to the open side of the sector.

According to the electronic shutter of the present invention configured as described above, since the balance plate is installed at a portion corresponding to the opening side of the sector, the magnetic force of the permanent magnet acts on the meter case and the balance plate at the opening side, and at the closing side. Since the magnetic force of the permanent magnet acts only on the case, the size of the holding torque generated by the permanent magnet is larger than that of the closed side.

In the above, the spring torque by the elastic member is set to appear large on the open side and small on the closed side.

Therefore, even if the holding torque is set based on the open side where the difference between the holding torque and the spring torque is small, the difference between the holding torque and the spring torque on the closing side does not appear so much. The starting torque of may be small.

In addition, the electronic shutter of the present invention includes an automatic exposure meter that rotates forward or reversely according to a direction in which a current is applied, a rotation member that rotates by the automatic exposure meter and a gear is formed on a part of an outer circumferential surface, and the rotation member. A sector driving member having a gear engaged with the formed gear formed on one end surface and having a sector pin coupled to the sector, and an elastic member for applying a force to the sector driving member in a direction of opening the sector; The meter has a body fixed to the shutter base and a driving pin rotatably installed on the body and rotating the rotating member in the direction of closing the sector, and the negative pole (N pole) and the south pole (S pole) are semicircular. A cylindrical permanent magnet formed, a coil wound around the body so as to surround the permanent magnet in a radial direction, and a meter case installed on the body; By the way, due to the meter case it comprises a balance plate, which is installed to a predetermined size in the region corresponding to the closed side of the sector.

According to the electronic shutter of the present invention configured as described above, since the balance plate is installed in a portion corresponding to the closed side of the sector, the magnetic force of the permanent magnet acts only on the meter case on the open side, and the permanent on the closed side. Since the magnetic force of the magnet acts on the meter case and the balance plate, the size of the holding torque generated by the permanent magnet is larger than that of the open side.

In the above, the spring torque by the elastic member is set to appear large on the closing side and small on the opening side.

Therefore, even if the holding torque is set based on the closing side where the difference between the holding torque and the spring torque is small, the difference between the holding torque and the spring torque on the open side does not appear so much. The starting torque of may be small.

In addition, the electronic shutter of the present invention applies a voltage to the auto exposure meter for a predetermined time when the power switch of the camera is turned on in case the sector is partially or fully open due to an external shock or malfunction. The control pulse is first applied to the closing side, and then the control pulse to the opening side.

According to the electronic shutter of the present invention configured as described above, since the operation for exposure is always performed in a state in which the sector is closed, exposure failure due to an operation error does not occur.

1 is a perspective view showing an embodiment of an automatic exposure meter applied to an electronic shutter according to the present invention.

FIG. 2 is a graph showing changes in holding torque and spring torque when the embodiment of the automatic exposure meter shown in FIGS. 1 and 7 is applied. FIG.

Figure 3 is a perspective view showing another embodiment of the automatic exposure meter applied to the electronic shutter in accordance with the present invention.

4 is a graph showing a change in holding torque and spring torque when another embodiment of the automatic exposure meter shown in FIGS. 3 and 15 is applied.

FIG. 5 is a graph illustrating a comparison of holding torques of FIGS. 1, 3, 10, and 13 when the automatic exposure meter and the conventional automatic exposure meter are applied according to the present invention.

6 is a graph showing a control pulse applied when operating the electronic shutter according to the present invention.

7 is a front view schematically showing an example of the electronic shutter;

8 is a rear view schematically showing the configuration of a power source and an automatic exposure meter in an electronic shutter;

Fig. 9 is a plan view schematically showing the configuration of a sector in an electronic shutter.

10 is a perspective view showing an example of a conventional automatic exposure meter.

11 is a cross-sectional view showing an example of a conventional automatic exposure meter.

12 is a bottom view of the commutator and drive pins.

13 is a perspective view showing another example of a conventional automatic exposure meter.

FIG. 14 is a graph showing changes in holding torque and spring torque in the electronic shutter shown in FIGS. 7 and 13; FIG.

15 is a front view schematically showing another example of the electronic shutter.

Fig. 16 is a graph showing changes in holding torque and spring torque in the electronic shutter shown in Figs. 13 and 15;

Next, a preferred embodiment of the electronic shutter according to the present invention will be described in detail with reference to the drawings.

First, as shown in FIGS. 1 and 7 and 9, one embodiment of the electronic shutter according to the present invention includes an automatic exposure meter 60 that rotates forward or reversely according to a direction in which a current is applied, and the automatic exposure described above. Rotating member 42 which is rotated by the meter 60 and the gear 43 is formed on a part of the outer circumferential surface, and gear 47 which meshes with the gear 43 formed on the rotating member 42 are formed on one end surface. And a sector driving member 46 having a sector pin 48 coupled to the sector 8, and an elastic member 58 for applying a force to the rotating member 42 in the direction of closing the sector 8. do.

The automatic exposure meter 60 has a body 61 fixed to a shutter base (not shown) and a rotating member rotatably installed on the body 61 and opening the sector 8. A driving pin 54 for rotating the 42 is formed, and the permanent magnet 63 having a cylindrical shape in which the negative pole (N pole) and the south pole (S pole) are formed in a semicircular shape, and the permanent magnet 63 in the radial direction. Corresponding to the opening side of the sector 8 in addition to the coil 66 wound on the body 61, the case 65 installed on the body 61, and the case 65 so as to be wrapped in the body 61. It includes a balance plate 65 installed in a predetermined size to the site.

In addition, an embodiment of the electronic shutter according to the present invention configured as described above is a rotor 2 which is a permanent magnet of 4 poles as shown in FIG. 8 and a drive gear 4 integrally formed with the rotor 2. And a power source consisting of a pair of stators (6).

And one embodiment of the electronic shutter according to the present invention is coupled to the drive gear 4 of the above-described power source as shown in Figure 7 a plurality of two-stage gears 12, 14 to rotate and reduce the rotational force transmitted (14) , A reduction gear group 10 consisting of (16) and the second gear 16 of the reduction gear group 10 of the above described rotation control and focus adjustment is formed on the inner circumferential surface of the helical coupling coupled with the lens holder (1) The ring 20 and a photo interrupter 30 for detecting the position of the focusing ring 20 is further included.

In one embodiment of the electronic shutter according to the present invention configured as described above, when the user presses the shutter release button, the rotor 2 is applied by applying a voltage to the stator 6 of the power source with a predetermined pulse. As the rotor 2 rotates, the driving gear 4 rotates to rotate the focusing ring 20 through the reduction gear group 10 to extract the focusing lens by the distance measured. Adjust the focus.

Subsequently, when a predetermined voltage is applied to the coil 66 of the auto exposure meter 60 such that a torque greater than the sum of the holding torque and the spring torque acts on the permanent magnet 63 of the auto exposure meter 60. The permanent magnet 63 rotates, and the driving pin 54 formed on the permanent magnet 63 rotates the rotating member 42 in the direction in which the sector 8 is opened.

As described above, when the rotating member 42 rotates, the sector driving member 46 geared to the rotating member 42 rotates, and the sector pin 48 is formed on the sector driving member 46. The pair of sectors 8 are rotated in the open direction to expose.

In the above, the total exposure amount is determined by the exposure time which is the time when the sector 8 is opened and closed and the degree of opening of the sector 8.

The opening degree of the sector 8 is determined by adjusting the time for applying the voltage to the automatic exposure meter 60 in accordance with the aperture value calculated by the photometric circuit unit.

When the sector 8 is opened to match the aperture value calculated by the photometric circuit unit as described above, the voltage applied to the coil 66 of the automatic exposure meter 60 is turned off.

When the voltage applied to the coil 66 is turned off, the magnetic force acting on the permanent magnet 63 and the case 65, that is, the holding torque, is applied to the sector 8 by the elastic member 58. Is larger than the spring torque acting on the rotating member 42 in the closing direction, the position of the driving pin 54 is kept fixed.

In the above state, when an appropriate exposure is made at a predetermined exposure time corresponding to the aperture value to correspond to the total exposure amount, a torque larger than the holding torque by the magnetic force of the permanent magnet 63 is applied to the driving pin 54. A predetermined reverse voltage is applied to the coil 66 of the automatic exposure meter 60 to act.

When a predetermined reverse voltage is applied to the coil 66 as described above, the driving pin 54 rotates in the direction in which the sector 8 is closed, and the rotating member 42 is free to rotate. By the elastic force of the elastic member 58, the sector 8 rotates in the direction of closing.

When the rotating member 42 rotates, the above-described sector driving member 46 rotates in a direction in which the sector 8 closes, and is paired by the sector pins 48 of the sector driving member 46. The sectors 8 in turn rotate in the closing direction.

According to an embodiment of the electronic shutter according to the present invention constructed and operated as described above, as shown in FIG. 2, since the balance plate 67 is installed at a portion corresponding to the open side of the sector 8, The magnetic force of one permanent magnet (63) acts on the case (65) and the balance plate (67), and the magnetic force of the permanent magnet (63) acts only on the case (65). The size of the holding torque generated by the permanent magnets 63 is smaller than the opening side. That is, when the difference between the holding torque and the spring torque is small and large, the deviation A < B appears smaller than the deviation E " F shown in Fig. 14 (A? E, B < F).

On the other hand, since the spring torque by the elastic member 58 has a smaller closing side than the opening side, the magnetic torque of the holding torque, i.e., the permanent magnet 63, is determined based on the opening side where the difference between the holding torque and the spring torque is small. Even if set, the holding torque at the closing side smaller than the opening side is also sufficiently larger than the spring torque at the closing side.

Therefore, according to one embodiment of the electronic shutter according to the present invention, since the holding torque on the closing side is low, the starting torque can be started even if the magnitude of the voltage applied to the coil 66 of the automatic exposure meter 60 is small. The holding torque on the open side is sufficient so that the sector 8 remains open even when the voltage applied to the coil 66 of the automatic exposure meter 60 is turned off.

Another embodiment of the electronic shutter according to the present invention, as shown in Figure 3 and 9 and 15, the automatic exposure meter 70 for forward or reverse rotation according to the direction in which the current is applied, and the automatic exposure Rotating member 42 which is rotated by the meter 70 and the gear 43 is formed on a part of the outer circumferential surface, and gear 47 which meshes with the gear 43 formed on the rotating member 42 are formed on one end surface. And a sector driving member 46 having a sector pin 48 coupled to the sector 8 and an elastic member 58 for applying a force to the sector driving member 46 in the direction of opening the sector 8. Include.

The automatic exposure meter 70 has a body 71 fixed to a shutter base (not shown) and a rotating member rotatably installed in the body 71 and closing the sector 8. A driving pin 54 for rotating 42 is formed, and a permanent magnet 73 having a cylindrical shape in which the negative pole (N pole) and the south pole (S pole) are formed in a semicircular shape, and the permanent magnet 73 is radially formed. Coil 76 wound on the body 71 so as to be wrapped in the body, the case 75 installed on the body 71 and the case 73 in addition to the closed side of the sector 8 It includes a balance plate 77 installed in a predetermined size to the site.

The other embodiment of the electronic shutter according to the present invention also has the same configuration as that of the embodiment of the electronic shutter according to the present invention shown in FIGS. 1, 7 and 9 except for the above-described configuration.

In another embodiment of the electronic shutter according to the present invention configured as described above, when the user presses the shutter release button, automatic focusing is performed by the same operation as the above-described embodiment, and the coil of the automatic exposure meter 70 A predetermined voltage is applied to the drive pin 54 so that a torque larger than the holding torque of the magnetic force of the permanent magnet 73 acts on the driving pin 54.

When the voltage is applied to the coil 76 as described above, the driving pin 54 is rotated in the direction in which the sector 8 is opened, the rotating member 42 is free to rotate, the elastic member The sector driving member 46 is rotated in the direction in which the sector 8 is opened by the elastic force of 58, and the pair of sectors 8 are formed by the sector pins 48 formed on the sector driving member 46. The exposure is achieved by rotating in the direction of opening.

When the sector 8 is opened to meet the predetermined aperture value, the voltage applied to the coil 76 of the automatic exposure meter 70 is turned off.

When the voltage applied to the coil 76 is turned off, the magnetic force acting on the permanent magnet 73 and the case 75, that is, the holding torque, is applied to the sector 8 by the elastic member 58. ) Is larger than the spring torque acting on the sector driving member 46 in the opening direction, the position of the driving pin 54 is fixed and maintained, and the rotation of the rotating member 42 is driven by the driving pin 54. The rotation of the sector drive member 46 geared to the rotary member 42 is stopped and the sector 8 remains open.

When the predetermined exposure is made in the above state, the torque greater than the combined torque of the holding torque by the magnetic force of the permanent magnet 73 and the spring torque by the elastic member 58 is greater than the driving pin 54. A predetermined reverse voltage is applied to the coil 76 of the automatic exposure meter 70 so as to act).

When a reverse voltage is applied to the coil 76 as described above, the driving pin 54 rotates to rotate the rotating member 42 in the direction in which the sector 8 is closed, and the rotating member 42 is rotated. The sector drive member 46 coupled with the gear is rotated in the direction in which the sector 8 is closed by overcoming the elastic force of the elastic member 58, the pair of sectors (8) by the sector pin (48) Rotates in the closing direction.

According to another embodiment of the electronic shutter according to the present invention constructed and operated as described above, as shown in FIG. 4, since the balance plate 77 is installed at a portion corresponding to the closed side of the sector 8, The magnetic force of one permanent magnet (73) acts only on the case (75) described above, and on the closing side, the magnetic force of the permanent magnet (73) acts on the case (75) and the balance plate (77). The size of the holding torque generated by the permanent magnets 73 is greater in the closing side than in the opening side. That is, when the difference between the holding torque and the spring torque is small and large, the deviation C " D appears smaller than the deviation G " H shown in Fig. 16 (C 도 G, D < H).

On the other hand, since the spring torque by the elastic member 58 has a smaller opening side than the closing side, the magnetic torque of the holding magnet, that is, the permanent magnet 63, is set based on the closing side having a smaller difference between the holding torque and the spring torque. The holding torque on the open side smaller than the figure closing side is also sufficiently larger than the spring torque on the open side.

Therefore, according to another embodiment of the electronic shutter according to the present invention, the holding torque at the closing side is sufficiently larger than the spring torque, so that the closing state can be maintained, and since the holding torque at the opening side is low, the low starting torque, that is, the above-described auto exposure meter Even if the magnitude of the voltage applied to the coil 66 of 60 is small, it can be started and the sector 8 can be operated from the open state to the closed state.

5 shows a comparison of holding torque in one embodiment and another embodiment of the electronic shutter according to the present invention and a conventional electronic shutter.

In FIG. 5, the dashed-dotted line P represents a change in holding torque when the embodiment of the auto-exposure meter according to the present invention shown in FIG. 1 is applied, and the dashed-dotted line R is an automatic according to the present invention shown in FIG. 3. The change in holding torque when another embodiment of the exposure meter is applied, the dotted line T indicates the change in holding torque when the example of the conventional automatic exposure meter shown in FIG. 10 is applied, and the solid line S is shown in FIG. The holding torque is changed when another example of the conventional automatic exposure meter shown in FIG. Is applied.

Further, according to another embodiment of the electronic shutter according to the present invention, when the power switch of the camera is turned on in the case where the sector 8 is partially or completely opened due to an external shock or malfunction, the predetermined embodiment is shown. Apply the voltage to the closing side to the coils 66 and 76 of the auto-exposure meters 60 and 70 for the time of, and when operating, first apply the control pulse to the closing side and then control pulse to the opening side. It is configured to apply.

In one or another embodiment of the electronic shutter according to the present invention described above, one of the pair of sectors 8 is provided with a slot 9 as shown in FIG. 9, and a shutter base (not shown). And a photo reflector 32 for detecting the rotation of the sector 8.

When the sector 8 is rotated in the direction in which the sector 8 is opened by the operation of the automatic exposure meters 60 and 70 (a state indicated by a double-dotted line in FIG. 9), the sector It senses that the slot 9 formed in (8) passes and recognizes the starting point at which the sector 8 is opened, and transmits it to the control unit of the camera to perform precise control of the exposure amount calculated by the photometric circuit unit.

According to another embodiment of the electronic shutter according to the present invention configured as described above, since the operation for exposure (operation in the open direction) is always performed in a state in which the sector 8 is closed, poor exposure due to an operation error occurs. I never do that.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

According to the electronic shutter according to the present invention, which is constructed and operated as described above, only the portion of the auto exposure meter corresponding to the larger torque of the spring is larger so that the holding torque of the larger spring torque is relatively larger than that of the smaller torque. Since the plate is installed, it is possible to keep the size of the overall holding torque small, and even at low starting torque, the driving pin of the auto-exposure meter can be opened or closed in a stationary state even at a low starting torque.

In addition, according to the electronic shutter according to the present invention, the control pulse is applied to the closing of the sector before opening the sector, and then the control pulse is applied to the opening of the sector, so that exposure failure due to a malfunction is not generated.

Claims (4)

A sector drive in which an autoexposure meter that rotates forward or reverse according to a direction in which a current is applied, a rotating member that is rotated by the above-described auto exposure meter, and a sector pin that is geared to the rotating member and coupled to a pair of sectors An electronic shutter comprising a member and an elastic member for applying a force in a direction of closing a sector to the rotating member, wherein the automatic exposure meter is rotatably mounted to the body fixed to the shutter base and to open the sector. A driving pin for rotating the rotating member in a direction is formed, and the coil and the coil wound around the body to surround the permanent magnet in the radial direction and the permanent magnet of the cylindrical shape in which the Y-pole and the S-pole are formed in a semi-circular shape and installed in the body. In addition to the meter and the case described above, a predetermined size is installed at a portion corresponding to the open side of the sector. Electronic shutter comprising a balance plate. The method of claim 1, wherein when the power switch of the camera is turned on, the auto exposure meter is applied with a voltage toward the closing side for a predetermined time, and when operated, a control pulse toward the closing side is first applied and then a control pulse toward the opening side is applied. Electronic shutter. A sector driving member having an automatic exposure meter rotating forward or reversely according to a direction in which current is applied, a rotating member rotated by the automatic exposure meter, and a sector pin gear-coupled with the rotating member and coupled to the sector; In the electronic shutter comprising an elastic member for applying a force to the sector driving member in the direction of opening the sector, the automatic exposure meter is a body fixed to the shutter base and rotatably installed in the body and the direction of closing the sector A driving pin for rotating the rotating member is formed, and the coil and the coil wound around the body so as to surround the permanent magnet and the permanent magnet of a cylindrical shape in which the Y-pole and the S-pole are formed in a semicircular shape in a radial direction. In addition to the meter case and the meter case, the feet are installed in a predetermined size at a portion corresponding to the closed side of the sector. Electronic shutter comprising a lance plate. The method of claim 3, wherein when the power switch of the camera is turned on, the auto exposure meter is applied with a voltage toward the closing side for a predetermined time, and when operated, a control pulse toward the closing side is first applied and then a control pulse toward the opening side is applied. Electronic shutter.

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