JPH03105334A - Shutter device for camera - Google Patents

Abstract

PURPOSE:To surely make light emission by a stroboscope synchronize with a shutter which is released at a high speed at the time of performing photographing in a daylight synchro mode by providing a daylight trigger means which gives a light emission signal to the stroboscope in specified timing before a 1st sector attains a set stop value. CONSTITUTION:The 1st sector 10 which is ordinarily energized in an opening direction and a 2nd sector 11 which is ordinarily energized in a closing direction are opened and closed by a stepping motor 69 and switched to be in an ordinary photographing mode and the daylight synchro mode. In the daylight synchro mode, the 1st sector 10 is opened at a position where the stop corresponding to photometric data is formed by the motor 69 in a state where the 2nd sector 11 is opened and locked by the motor 69, and the shutter is released just by closing the 2nd sector 11 in the specified timing thereafter. When the shutter is released at a high speed at the time of performing photographing in the daylight synchro mode, the light emission by the stroboscope is surely made to synchronize with the shutter and a shutter speed is made higher.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a shutter device used in an autofocus autoexposure camera, and more particularly to a shutter device that opens and closes a shutter sector to release a lens shutter.

"Prior art and its problems" Conventionally, in an autofocus autoexposure camera that sequentially performs focus adjustment and exposure control in conjunction with the release operation, the lens is moved to the focus position in conjunction with the release, and the lens shutter is then activated. It was driving. In this auto-focus auto-exposure camera, two or more sectors (shutter blades) are opened and closed to block the optical path, the exposure is determined by the opening operation, and the shutter speed is determined by the timing from the opening state to the closing state. It had been decided. Therefore, two operations, opening and closing, are required for the same sector, making it difficult to further increase the shutter speed.

Therefore, the present applicant has previously proposed a shutter device that can increase the shutter speed based on the idea of configuring the shutter using a first sector and a second sector that can be opened and closed independently. .

This shutter device is configured to hold the second sector at an appropriate aperture based on photometric data, then open the closed first sector with a spring, and then close the second sector with a spring at a predetermined timing. has been done. Therefore, the shutter speed is determined by the opening/closing timing in which the first sector is quickly opened by the spring and the second sector is quickly closed by the spring, making it possible to further increase the shutter speed. However, although the above-mentioned shutter device proposed by the present applicant can increase the shutter speed with a simple structure, the first and second sectors, which open and close with springs, are particularly useful during daytime synchronized shooting. Strobe light emission must be synchronized with the shutter operating at high speed, and there is a risk that this synchronization may not be performed properly and good exposure may not be obtained.

``Object of the Invention'' Therefore, an object of the present invention is to provide a shutter device that can increase the shutter speed and reliably synchronize strobe light emission with the shutter that is released at high speed, especially during daytime sync mode photography. purpose.

"Summary of the Invention" The present invention comprises: a first sector that is normally biased in the opening direction by a biasing means; a first sector locking means that locks the first sector in an arbitrary opening; a second sector urged in a closing direction by a biasing means; a second sector locking means for locking the second sector at an arbitrary opening; a stepping motor for opening and closing the first and second sectors; The second sector is opened at a position where a diaphragm is formed according to the photometric data by the stepping process, and after being locked by the second sector locking means, the first sector locking means is released to open the second sector. a normal photographing mode in which one sector is opened by the urging means, and the second sector locking means is released and closed by the urging means to end the exposure; the second sector is opened by the stepping motor and the second sector is closed; After being locked by the locking means,
a daytime synchronization mode in which the first sector is opened by the stepping motor to a position where an aperture is formed according to the photometry data, and the second sector locking means is released and the second sector is closed by the biasing means to end the exposure; Furthermore, in the daytime synchronization mode, a daytime trigger means is provided for giving a light emission signal to the strobe at a predetermined timing before the first sector reaches the set aperture value. "Embodiments of the Invention" The present invention will be described below with reference to illustrated embodiments. FIG. 1 is an exploded perspective view of the shutter device according to the present invention, and O is the optical axis of the photographic lens system.

As shown in FIG. 1, the shutter device 1 of the present invention includes a release section 2, a drive section 3, a drive mechanism holding block 4, and a focusing lens barrel 5.

The release part 2 has an annular base 8.9 having a hole 6.7 centered on the optical axis O, and between these annular spaces 8 and 9 there is a first sector 10 and a first sector 10 that can block light. 2
Sector 11 is installed, the first sector ] 0 and the second sector l
1 has a pair of sector members 10a, 10b and sector members 1la, llb, respectively.

The annular base 9 is formed with protruding pivot points 12, 13, and 14. The sector member 10a of the first sector 10 is pivotally supported on the rotation fulcrum l2, and the sector member Job of the first sector 10 and the sector member 11a of the second sector 1 are pivotally supported on the rotation fulcrum l3. The sector member 1 1 of the second sector 11 is located at the rotation fulcrum l4. b is pivoted.

The drive unit 3 has an actuation plate 16 with a hole l5 formed in the center, and a start switch 1 is provided around the actuation plate 16.
7, a lever member 19, an operating ring 20, a first sector lever 46, a second sector lever 21, etc. are arranged.

The actuation plate l6 has a hole 15 centered on the optical axis O,
A gear 22 is formed on the outer periphery of the actuating plate l6, and a cam portion 23, an actuating lever 24, a cam portion 2
5.26 are formed in sequence.

The starting switch 17 has a switch lever 18 .

A torsion spring 28 is fitted into the pivot point 27 of the switch lever l8.
8 has one end in contact with the hook 29 and the other end in contact with a bottle 30 fixed to the camera body side, and the switch lever 1
8 is always biased counterclockwise. This switch lever l8 has a contact bar 31 that projects laterally,
This contact bar 31 can be rotated clockwise and counterclockwise by being guided by the cam portion 23, and when rotated counterclockwise, one end of the spring 28
terminal]. 7 a and the start switch l7 is turned on.
Operate. Furthermore, the other end of the torsion spring 28 and the terminal 17a of the start switch 17 are each connected to the tip of a lead wire connected to the motor drive control circuit 32.

As shown in FIGS. 1 and 2, the lever member l9 has one end pivoted on a rotation fulcrum 33, and has a protrusion 19a in its center that extends to the left in the figure. is formed, and an abutment pin 35 is formed near the rotation fulcrum 33.
has been planted.

Furthermore, the rotation fulcrum 33 is formed in a “he” shape,
An actuating member 3 having a locking lever 36 bent at one end thereof
7 is rotatably supported. And the actuating member 3
The other end of the actuating member 37 is movable toward and away from an abutment pin 35 installed in the lever member l9, and a spring 39 is provided between the other end of the actuating member 37 and the lever member l9. It is stretched. Therefore, the actuating member 37 is biased counterclockwise by the spring 39 and comes into elastic contact with the abutting pin 35. Further, the actuating member 37 is restricted from rotating counterclockwise by a positioning pin 40 installed on the shutter device 1 main body side.

An armature 41 is attached to the other end of the lever member 19, and a second sector electromagnet 44 connected to an electromagnet control circuit 42 is installed at a position facing the armature 41. A spring 43 is stretched behind the armature 41, and while the second sector electromagnet 42 is not excited, the lever member 19 rotates clockwise together with the operating member 37 until it is regulated by the positioning pin 45. move.

The locking lever 36 of the actuating member 37 is bent laterally, passes through a hole 9a formed in the annular base 9, and is inserted into the sector member 11a.
It is placed above the . The sector member 11a has serrated ratchet teeth 54 on its upper part.
is formed in an arc shape. Therefore, sector member 1
When 1a rotates clockwise, the locking lever 36 comes into elastic contact with the ratchet teeth 54 due to the spring 39.
However, the ratchet teeth 54 are overcome one by one. Then, when the sector member fla stops, the locking lever 36 engages the locking lever 36 at the meshing position at that time, and holds the sector member 11a at that position. Further, on the left side of the ratchet tooth 54 in the figure, an engaging tooth 54a is formed which can engage the locking lever 36 at the position where the sector member 11a is rotated most clockwise.

On the other hand, the first sector lever 46 is rotatably supported at a pivot point 47, and has bifurcated portions 46a and 46b above the pivot point 47 in the drawing. One side 46a of this bifurcated part
An operating bar 49 is attached to 46b, and a long first sector opening/closing bar 50 is attached to the other 46b.

The actuation bar 49 is in contact with the cam portion 26 of the actuation plate 16, and the first sector opening/closing bar 50 is connected to the elongated hole 9b formed in the annular base 9 and the elongated hole 9 of the sector members 10a, 10b.
It is inserted into both 1 and 92. And the actuating plate 16
At the initial position, the actuating bar 49 rides on the highest position of the cam part 26, so the first sector lever 46 rotates counterclockwise against the spring 53, and
7 is moved to a position where it can be attracted by the first sector electromagnet 55. At the same time, the first
The sector 10 includes long holes 91 in sector members 10a and 10b,
Since the upward force from the first sector opening/closing bar 50 is applied to the sector member 92, the sector member 10a is rotated counterclockwise and the sector member 10b is rotated clockwise.
is closed. Note that 48 in the figure is a positioning pin that restricts the clockwise rotation of the first sector lever 46 at a predetermined position.

The second sector lever 21 is rotatably supported at its center by a rotation fulcrum 59, and has a second sector opening/closing bar 60 implanted on one side of one end thereof, and a bar on the other side. One member 97 is implanted, and the other end is biased by a spring 6l.

Therefore, the second sector lever 21 is normally rotated to a position regulated by the positioning pin 62.

Further, the interlocking bar member 60 passes through the elongated hole 9C formed in the annular base 9 and the elongated holes 51 and 52 formed in the sector members 11a and 11+]. Therefore, the second sector l] applies the force of the spring 6 to the second sector opening/closing bar 60.
The cam portion 25 is biased in the closing direction.
When the second sector opening/closing bar 60 is pressed due to the movement of
Open your mouth.

The drive mechanism holding block 4 has a middle frame 65 and a motor mounting base 66, and a female threaded portion 67 is formed in the center of the middle frame 65. Further, a stepping motor 69 is disposed on the motor mount 66 .

The stepping motor 69 has a rotor 72 rotatably disposed at the intersection of stators 70 and 71 arranged in a dogleg shape. The stator To, 71 has a coil 73.
75 are wound, and these coils 73 and 75 are connected to the motor drive control circuit 32 through lead wires.

The rotor 72 passes through the middle frame 65, and a pinion gear 76 attached to its tip meshes with a pinion gear 77 that meshes with the gear 22 of the actuating plate 16. It consists of

Arc grooves 80 and 81 are formed in the middle frame 6S and the motor mounting base 66 along respective circumferences centered on the optical axis O. The actuation ring 20 is fitted into the cylindrical portion 82 provided at the center of the middle frame 65, and the actuation lever 83 provided on the actuation ring 20 passes through the arc 80.81, and its tip is It engages with the center of a bifurcated interlocking arm 85 formed on the focusing lens barrel 5.

A male threaded portion 86 is formed on the outer periphery of the focusing lens barrel 5, and the male threaded portion 86 is screwed into the female threaded portion 67 of the middle frame 65. Therefore, when the stepping motor 69 is not driven, the focusing lens barrel 5 is moved by the spring 8.
7, it is rotated to the maximum clockwise, and the lens is in the maximum retracted position.

Further, the stepping motor 69 is driven, and the actuating plate 1
6 is rotated counterclockwise, for example, the bent portion 24 contacts and suppresses the actuating lever 83 of the actuating ring 20 after a predetermined interval. As a result, the actuating lever 83 rotates along the arcuate groove 80.81, and the focusing lens barrel 5 is rotated in the same direction and extended.

A ratchet tooth 20 is provided on a part of the outer periphery of the operating ring 20.
a is formed. Adjacent to the actuation ring 20, a lens locking lever 93 having a claw portion 93a at one end is rotatably supported at a rotation fulcrum 95. A spring 96 is stretched between the other end of the lens adjustment lever 93 and the main body of the shutter device 1. Therefore, the lens locking lever 93 is rotated counterclockwise by the spring 96 and comes into contact with the lever member 97, so that its rotation is restricted. Note that the tension of the spring 96 is set to be weaker than that of the spring 61, and when the second sector lever 21 rotates clockwise and comes into contact with the positioning pin 62, the lens locking lever 93 is moved by the lever member 97.
can be rotated in the same direction by pushing up the other end.

The motor drive control circuit 32 and electromagnet control circuit 42
is connected to the arithmetic circuit 88. The arithmetic circuit 88 incorporates a photometry means 89 that calculates photometry data based on a photometry switch, and a distance measurement means 90 that calculates distance measurement data based on a distance measurement switch.

Next, the operation of the shutter device l when the mode is set to normal shooting mode by a mode switch (not shown) will be explained along with the operating state diagrams in FIGS. 2 to 7 and the timing chart in FIG. 8. .

In the initial position where the photometry and ranging switch is set to F, the electromagnet 55 for the first sector and the electromagnet 4 for the second sector
4 are all demagnetized, and the stepping motor 69 is stopped, so that the shutter device I is in the state shown in FIG.

That is, the actuating plate 16 is held at the initial position in the normal photographing mode, the actuating bar 49 rides on the highest position of the cam portion 26, and the first sector lever 46 is rotated counterclockwise. Therefore, the first sector opening/closing bar 5
0 rotates in the same direction, rotates the sector member 10a counterclockwise and the sector member iob clockwise to block the optical path and close the shutter. In addition, the second sector opening/closing bar 6
0 is at the lowest position of the cam portion 25, and the second sector lever 21 is rotated clockwise by the spring 61 until it is regulated by the positioning pin 62. This results in
The second sector opening/closing bar 60 moves the elongated hole 9C of the annular base 9 upward in the figure, rotates the sector member 11a counterclockwise and the sector member 1lb clockwise, and closes the second sector 11. state.

In this state, the actuation lever 24 of the actuation plate 16 engages with the protrusion 19a of the lever member 19, and the lever member 19 is rotated counterclockwise by a predetermined amount against the spring 43.

Therefore, the armature 41 is the electromagnet 4 for the second sector.
4, the locking lever 36 is in a position regulated by the positioning pin 40, and is in a state where it can engage with the ratchet teeth 54 of the sector member 11a.

A predetermined gap exists between the actuating lever 24 of the actuating plate l6 and the actuating lever 83 of the actuating ring 20, and the actuating ring 20 is fully rotated clockwise by the spring 87. Therefore, the operating lever 83 is
The focusing lens barrel 5 is rotated in the same direction until it comes into contact with the clockwise ends of the circular arc groove 80 of the motor mounting base 66 and the circular arc groove 81 of the motor mounting base 66, and the lens is fully retracted.
At this time, the lens locking lever 93 is rotated clockwise until the second sector lever 21 comes into contact with the positioning pin 62, so the other end of the lens locking lever 93 is pushed up by the lever member 97 and is pushed against the spring 96. It is rotated clockwise. Therefore, the pawl portion 93a is the ratchet tooth 2 of the operating ring 2o.
It is located far away from 0a.

Further, the switch lever 18 rotates clockwise due to the contact bar 31 riding on the high part of the cam part 23, and releases one end of the torsion spring 28, which is a contact point, from the contact point 17a, and turns the start switch 17. It is maintained in the leaf F state.

From this state, when you turn on the photometry and distance measurement switch (press the release switch halfway), the calculation circuit 88 is activated, and the photometry means 89 calculates the photometry data, and the distance measurement means 90 calculates the distance measurement data. Ru.

Further, when the release switch is turned on, the photometry means 8
From the motor drive control circuit 32 based on the photometric data of No. 9,
A number of forward rotation pulses corresponding to the brightness of the subject are applied to the stepping motor 69, and the motor 69 begins to rotate forward for a predetermined number of steps. At the same time, the second sector electromagnet 44 is energized by a signal from the electromagnet control circuit 42 based on the arithmetic circuit 88, and attracts the armature 4l that is in contact with this IT&Ii stone 44, and the first sector electromagnet 55 is excited, and the armature 5 is in contact with this electromagnet 55.
Adsorb 6.

Therefore, the other end of the lever member l9 is attracted, and even if the protruding portion 19a is released from the operating lever 24, it is held so as not to rotate counterclockwise. Further, the other end of the first sector lever 46 is also attracted, and the operating bar 4
Even if 9 is released, it is held so as not to rotate clockwise.

When the stepping motor 69 receives a normal rotation pulse corresponding to the number of aperture steps determined in advance by photometry and the rotor 72 rotates in the normal direction, the rotation of the rotor 72 causes the actuating plate 16 to move clockwise through the reduction gear train 79. begins to rotate. Then, the cam portion 25 gradually presses down the second sector opening/closing bar 60, so that the second sector opening/closing bar 60 moves radially outward within the elongated hole 9c of the annular base 9, and the sector member 11
a clockwise and sector member 1lb counterclockwise. At this time, since the lens locking lever 93 rotates counterclockwise following the movement of the lever member 97, its claw portion 93a comes into contact with a portion of the actuating ring 20 other than the ratchet teeth 20a.

One step of the stepping motor 69 corresponds to one tooth of the ratchet tooth 54 of the sector member 11a, and this one tooth corresponds to one scale of the aperture value. By rotation, the second sector 11 can be opened to obtain the desired exposure value. Therefore, when the rotor 72 is stopped after rotating forward a predetermined number of steps, the second sector 1l forms an opening S corresponding to a desired exposure value, as shown in FIG. At this time, the locking lever 36 climbs over the ratchet teeth 54 one by one, and when the actuating plate 16 stops, it is locked at the meshing position at that time, holding the second sector 1l at its open position, and determining the aperture. .

In this state, the first sector 10 remains closed, so the shutter opening 6 remains shielded from light and is not exposed to light.

Subsequently, the motor drive control circuit 32 outputs a predetermined number of steps of reversal pulses to the stepping motor 69, so the rotor 72 reverses and rotates the actuating plate 16 counterclockwise via the reduction gear train 79. do. Then, the actuating bar 49 gradually comes off from the cam part 26, but the first sector lever 46 moves the armature 56 to the first sector electromagnet 55.
Since the first sector 10 is attracted by the first sector 10, it does not rotate clockwise, and therefore the first sector 10 continues to maintain its closed state.

In addition, the cam portion 23 rotates the contact bar 3 as the actuating plate l6 rotates.
1 is gradually released, and the switch lever 18 is rotated counterclockwise by the torsion spring 28. As a result, one end of the torsion spring 28 is connected to the start switch l.
7, and the start switch 17 is turned on (see FIG. 4).

During the operation caused by the rotation of the actuating plate l6, the actuating lever 24 does not come into contact with the actuating lever 83 of the actuating ring 20 due to the presence of a predetermined gap, so the focusing lens barrel 5 does not operate.

The stepping motor 69 continues to rotate in reverse until the number of in-focus position steps calculated by the distance measuring means 90 is satisfied. Therefore, the actuating lever 24 of the actuating plate 16 starts to come into contact with the actuating lever 83 of the actuating ring 20 from a predetermined rotational position, and the actuating ring 20 is rotated counterclockwise (the fifth
(see figure).

Then, the actuating lever 83 moves between the middle frame 65 and the mork mounting base 6.
While moving within the arcuate grooves 80 and 81 of No. 6, the focusing lens barrel 5 is rotated in the same direction, and the lens barrel 5 is extended to the focusing position. At this time, the claw portion 9 of the lens locking lever 93
3a climbs over the ratchet teeth 20a one by one and is locked at the engaged position when the actuating ring 20 stops, thereby holding the actuating ring 20, that is, the focusing lens barrel 5 at the in-focus position.

Thereafter, when the first sector electromagnet 55 is demagnetized by a signal from the electromagnet control circuit 42, the armature 56, that is, the sector lever 46 is released. As a result, the sector lever 46 is rotated clockwise by the spring 53 (see FIG. 6).

Therefore, the first sector opening/closing bar 50 moves radially outward of the annular base 9 and rotates the sector member 10a clockwise and the sector member 10b counterclockwise, so that the first sector 10 is fully opened. . At this point, the second sector 1l is opened to satisfy the predetermined exposure value, so
It is exposed through the first sector 10 and the second sector 1l. Further, after a predetermined period of time has elapsed to satisfy the appropriate exposure obtained by the photometry means 89, the second sector electromagnet 44 is demagnetized by a signal from the electromagnet control circuit 42. For this reason,
The armature 4l, that is, the lever member l9 is released and rotated clockwise by the spring 43. As a result, the actuating member 37 rotates in the same direction as the lever member l9, and the locking lever 36 disengages from the ratchet teeth 54 of the sector member 11a, releasing the sector member 11a.

Therefore, the second sector opening/closing bar 60 has a spring 6l.
As a result, it rotates clockwise until it is regulated by the positioning pin 62. At this point, the cam portion 25 is in a position retracted from the second sector opening/closing bar 60 due to the rotation of the actuating plate l6, so that the sector interlocking bar member 60 is inserted into the elongated hole 9 of the annular base 9.
moving radially inward along c. As a result, the sector member 11a rotates counterclockwise and the sector member 1lb rotates clockwise to close the second sector I1, and the exposure that started from the opening of the first sector 10 ends at this point. At this time, the other end of the lens locking lever 93 is pressed upward by the clockwise movement of the lever member 97 and rotates in the same direction, so the claw portion 93a disengages from the ratchet teeth 20a and locks the actuating ring 20. release. Therefore, the actuating ring 20 is rotated clockwise by the spring 87, and the focusing lens barrel 5 is returned to its initial position.

After the exposure, the stepping motor 69 receives a predetermined number of steps of normal rotation pulses from the motor drive control circuit 32 and begins to rotate in the normal direction, causing the operating slope l6 to rotate clockwise. As a result, the cam part 26 of the actuating plate l6 rides on the actuating bar 49 of the first sector lever 46 at its highest point, so the first sector 10 is returned to the closed position (
charging), the shutter device 1 is brought to the initial state shown in FIG. Also, just before the charging of the first sector 10 is completed, the contact bar 31 rides on the cam portion 23, so that
The torsion spring 28 is separated from the terminal 17a,
Start switch l7 is turned off.

On the other hand, the operation of the shutter device 1 when the mode is set to "daytime synchronization mode" by a mode switch (not shown) is shown in the operating state diagrams in FIGS.
This will be explained along the timing chart shown in the figure.

In the initial state where the photometry and distance measurement switches are turned off, the shutter device 1 is set to the second
It is in the same condition as shown in the figure. From this state, photometry. When the distance measurement switch is turned on, the calculation circuit 88 is activated, and the photometry means 89 calculates photometry data, and the distance measurement means 9o calculates distance measurement data.

Then, when the release switch is turned on, the stepping motor 69 starts to rotate forward by a predetermined number of steps based on the motor drive control circuit 32. At the same time, a signal from the electromagnet control circuit 42 based on the arithmetic circuit 88 causes the second sector electromagnet 6a to be excited 1a to attract the armature 4l at the contact position with the electromagnet 44, and The electromagnet 55 is excited and attracts the armature 56 which is in contact with the electromagnet 55. As a result, the other end of the lever member l9 is attracted, and the protruding portion 19a is held so as not to rotate counterclockwise even when the operating lever 24 is released. Also, the first sector lever 4
6 is also attracted at its other end, and is held so as not to rotate clockwise even when the actuating bar 49 is released from the cam portion 26.

Then, the stepping motor 69 rotates forward a predetermined number of steps to rotate the actuating plate l6 clockwise via the reduction gear train 79. Then, the cam portion 25 opens the second sector opening/closing bar 60.
is pressed, the second sector opening/closing bar 60 moves fully radially outward within the long hole 9c of the annular base 9, and rotates the sector member 11a clockwise and the sector member 1lb counterclockwise. . At this time, after overcoming the ratchet teeth 54 one by one, the locking lever 36 engages with the engagement ti 5 4 a when the sector member 11a rotates clockwise to the maximum, and fully opens the second sector 11. Hold in position (see Figure 9).

Then, the stepping motor 69 is temporarily stopped. In this state, the first sector 10 remains closed, so the shutter opening 6 remains shielded from light and is not exposed to light. At this time, the lens locking lever 93 is connected to the second sector opening/closing bar 6.
0 rotates counterclockwise, and the claw portion 93a comes into contact with a portion of the actuating ring 20 other than the ratchet teeth 20a.

After a predetermined period of time, a reversal pulse of a predetermined number of steps is sent from the motor drive control circuit 32 to the stepping motor 69.
As the rotor 72 reverses, the actuating plate l6 is rotated counterclockwise via the reduction gear train 79. Then,
Although the actuation bar 49 gradually comes off from the cam portion 26, the first sector lever 46 does not rotate clockwise because the armature 56 is attracted by the first sector electromagnet 55, and the first sector 10 Continue to maintain the closed state. Further, the cam portion 23 is rotated by the rotation of the actuating plate 16, so that the contact bar 3
1 is gradually released, and the switch lever 18 is rotated counterclockwise by the torsion spring 28. As a result, one end of the torsion spring 28 is connected to the start switch 17.
contacts the terminal 17a, and the start switch 17 turns on (
(See Figure 10). During said operation by rotation of the actuating plate 16, its actuating lever 24 is moved by the actuating lever 8 of the actuating ring 20.
3, since there is no contact due to the presence of a predetermined gap, the focusing lens barrel 5 does not operate.

Then, the stepping motor 69 continues to reversely rotate in the same direction until the number of steps of the focus position calculated by the distance measuring means 90 is satisfied. Therefore, the actuating lever 24 of the actuating plate l6 starts to abut the actuating lever 83 of the actuating ring 20 from a predetermined rotational position, and the actuating ring 20 is rotated counterclockwise (see FIG. 11). Then, the actuating lever 83 rotates the focusing lens barrel 5 in the same direction while moving within the arcuate grooves 80 and 81 of the middle frame 65 and the motor mounting base 66, and brings this lens barrel 5 into focus. Move it out to position. Then, when the focusing lens barrel 5 moves to the position based on the distance measurement data, the stepping motor 69 receives a stop signal from the motor drive control circuit 32 and stops. At this time, the claw portion 93a of the lens locking lever 93 climbs over the ratchet teeth 20a one by one and is locked at the engagement position when the actuation ring 20 stops.
That is, the focusing lens barrel 5 is held at the in-focus position.

From the time when the focusing lens barrel 5 is in focus, the stepping motor 69, which had been previously stopped, now starts to rotate forward for a predetermined number of steps, rotating the actuating plate l6 clockwise (the first
(See Figure 2). When the stepping motor 69 stops after a predetermined number of forward rotations, the contact bar 3l rides on the cam portion 23, so the start switch 17 is turned off, and the actuating bar 49 rides on the cam portion 26.

Thereafter, the first sector electromagnet 55 is demagnetized based on a signal output from the electromagnet control circuit 42 at a predetermined timing.
Since it is riding on the highest part of 6, it will maintain that state. At this time, since the ratchet teeth 20a of the actuation ring 20 are also locked by the lens locking lever 93,
It never returns to its initial position.

From this state, distance measurement data and strobe guide NO.
．． In order to satisfy the aperture value determined from , the motor drive control circuit 32 outputs a pulse signal of a predetermined number of steps. When the stepping motor 69 is reversed based on this,
The operating bar 49 slides on the cam portion 26 and gradually moves to a lower position away from the cam portion 26. therefore,
The first sector lever 46 is rotated clockwise by a spring 53. As a result, the sector member 10a rotates clockwise and the sector member 10b rotates counterclockwise, the first sector 10 gradually opens (see FIG. 13), the blocked optical path gradually opens, and exposure begins.

Then, by reversing the stepping motor 69 by a predetermined number of steps, the first sector 10 opens to a position forming an aperture that satisfies a predetermined exposure value. At this time, a synchro switch (not shown) is activated in synchronization with the pulse immediately before reaching the aperture aperture.
turns ON, the light emitting trigger is output and the strobe lights.

In "daylight synchronization", the position of the subject is determined by distance measurement, and the strobe guide number is set. However, when the distance to the subject is short, the aperture aperture formed by reversing the stepping motor 69 is smaller than the open aperture, so after firing the strobe,
The stepping motor 69 continues to rotate in reverse, and the first sector 1
Further open 0. Then, when the subject background reaches a predetermined aperture for proper exposure, the stepping motor 69 is stopped based on a stop signal from the motor drive control circuit 32. At this time, the opening is as shown by S' in FIG.

Furthermore, when the distance to the subject is long, the aperture diaphragm is set to the maximum aperture, so immediately after the strobe light is emitted, the stepping motor 69 rotates by l pulses and is stopped.
Do not open sector IO any more.

From this state, when a predetermined time period for achieving proper exposure calculated by the photometry means 89 has elapsed, the second sector electromagnet 44 is demagnetized by a signal from the electromagnet control circuit 42 .

Therefore, the lever member 19 is moved by the spring 43.
It rotates clockwise together with the operating member 37. Then, the locking lever 36 comes off the engagement tooth 54a and the sector member 11a
is released, the biasing force of the spring 61 transmitted via the second sector opening/closing bar 60 causes the sector member 1 ]. a rotates counterclockwise, and sector member 1lb rotates clockwise. Therefore, the aperture S' is closed and the exposure is completed (see FIG. 14).

At this time, the second sector lever 21 is
As the lever member 97 rotates in the clockwise direction, the lever member 97 also rotates in the same direction, so that the lever member 97 pushes up the other end of the lens locking lever 93 . In this case, since the tension of the spring 61 is set to be stronger than the tension of the spring 96, the lens locking lever 93 rotates clockwise. Therefore, since the claw portion 93a is disengaged from the ratchet teeth 20a of the actuation ring 20, the actuation ring 20 is rotated clockwise by the spring 87 and returned to the initial position. Therefore, the focusing lens barrel 5 is retracted to the pre-operation position by the actuation lever 83 rotating in the same direction.

After this, the stepping motor 69 rotates forward in response to a command from the motor drive control circuit 32 and starts rotating the actuating plate 16 clockwise again, so that the actuating blade 49 gradually rides on the cam portion 26 and the first sector lever 46 is rotated. It rotates counterclockwise against the spring 53 to return the first sector 10 to the closed position. At this time, since the contact bar 3l rides on the cam portion 23, the torsion spring 28 separates from the terminal 17a, and the start switch 17 is turned off. As a result, the forward rotation of the stepping motor 69 is stopped, the shutter device I is returned to the state shown in FIG. 2, and all operations are completed.

"Effects of the Invention" As described above, according to the present invention, the shutter can be released by simply opening the first sector with the second sector open and then closing the second sector at a predetermined timing. By simply changing the timing of operation of the second sector after opening the first sector, a desired shutter speed can be obtained and the shutter speed can be increased.

Furthermore, by switching to daytime synchronization mode, the first
The operation of the sector can be switched to an operation based on rotation of a predetermined number of steps by a stepping motor. Therefore, the operation of the first sector in which exposure is to be started in the daytime synchronization mode can be pulse-controlled, and strobe light can be emitted at appropriate timing simply by providing a light emission signal in synchronization with the pulse.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the shutter device of the present invention, and FIGS. 2 to 7 are front views showing different operating states of the shutter device in normal shooting mode.
The figure is a timing chart showing the operation timing of each part during the operation. 9 to 14 are front views showing different operating states of the shutter device during the daytime synchronization mode, and FIG. 15 is a timing chart showing the operating timing of each part during said operation.

Claims (2)

[Claims] (1) The first part is normally biased in the opening direction by the biasing means.
sector; a first sector that locks this first sector with an arbitrary opening;
sector locking means; a second sector which is normally urged in the closing direction by the urging means; second sector locking means which locks this second sector at any opening; a stepping motor for opening and closing the sector; the second sector is opened by the stepping motor to a position where an aperture is formed according to the photometric data, and after being locked by the second sector locking means, the first sector is locked; a normal photographing mode in which the locking means is released and the first sector is opened by the urging means, and the second sector locking means is further released and closed by the urging means to end the exposure; to open,
After being locked by the second sector locking means, the first sector is opened by the stepping motor to a position where an aperture is formed according to the photometric data, and then the second sector locking means is released and closed by the urging means. It is possible to switch between a daytime synchronization mode in which the exposure is terminated after the first sector reaches the set aperture value; A camera shutter device comprising: (2) The camera shutter device according to claim 1, wherein the daytime trigger means controls the light emission timing based on subject distance information.