JP2000039647A - Shutter for electronic camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of a shutter by constituting the shutter so that a separate member is not required for a shutter blade for a diaphragm and a shutter member for shielding exposure. SOLUTION: First, second and third diaphragm cams 1b, 1c and 1d are provided on the outer periphery of a driving ring 1. This shutter is provided with a diaphragm lever 4 having a pin 4b brought into elastic contact with the diaphragm cams outside the driving ring 1, a sector lever 5 for driving a sector for a diaphragm of a shutter aperture linked with the rocking of the diaphragm lever and a closing lever 6 for turning the sector lever 5 in the direction of closing the shutter aperture at a stroke when releasing from attraction by an electromagnet 7 A receiving part 1e for holding the closing lever 6 in an opening position of the shutter aperture and a notched part 1f for permitting the movement of the closing lever 6, when the shutter aperture is closed at a stroke are provided on the outer periphery of the driving ring 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter for an electronic camera.

[0002]

2. Description of the Related Art Unlike a camera for capturing an image on a film, an electronic camera does not open and close a shutter mechanically.
The exposure is performed by turning on the power supply, and when a sufficient exposure amount is obtained, the power supply is turned off to close the exposure. However, if the power is turned off to close the exposure, it is difficult to set the exposure amount exactly. Therefore, when closing the exposure, the shutter is mechanically closed to instantaneously shut off the exposure, and then the power is turned off. I try to turn it off.
As a conventional mechanism for that purpose, for example, Japanese Utility Model Laid-Open No. 4-31
In the device disclosed in Japanese Patent Publication No. 128, two shutter members are provided so as to be partially slidable and relatively slidable. A shutter opening is provided at this overlapping position. At one sliding position, both shutter openings overlap to open the opening, and at the other sliding position, both shutter openings are shifted and the opening is closed. Usually, the opening is held in a position where the opening is opened, and when a predetermined exposure amount is obtained, the shutter member is slid to shift the opening to instantaneously shut off the exposure.

[0003]

However, in such a conventional configuration, it is not possible to adjust the opening amount of the shutter opening, and therefore, a separate shutter blade for the stop is required. A shutter blade and a shutter member for blocking exposure are both required, which complicates the configuration and raises the cost accordingly.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention controls an opening / closing member for opening and closing a shutter opening by a control member for adjusting the opening amount of the shutter opening, and further comprises a closing member for controlling the opening amount of the shutter opening. The shutter opening is closed by the opening / closing member when released from the attraction by the electromagnet. And by using such an opening and closing member, both control and closing of the shutter opening become possible,
It is possible to eliminate the need for separate members for restricting and blocking.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to an image pickup device capable of being exposed by energization, an opening / closing member for opening and closing a shutter opening, a control member for adjusting the opening amount of the shutter opening, a closing member for closing the shutter opening, And an electromagnet capable of adsorbing the closing member. The opening / closing member is normally held at the open position, and a biasing force is applied in a direction to open the shutter opening, and the control member drives the opening / closing member in conjunction with the aperture cam to adjust the opening amount of the shutter opening. The closing member drives the opening / closing member to release the shutter opening when released from attraction by the electromagnet. The imaging element starts exposure of the subject image by energization when the shutter opening is open, and stops exposure when the shutter opening is closed.

The aperture cam is provided on the outer periphery of a drive ring that is driven to reciprocately rotate. The outer periphery of the drive ring is provided with a notch for allowing movement of a closing member for closing a shutter opening. Is desirable. It is preferable that a receiving portion for holding the closing member at an opening position of the shutter opening is provided on an outer periphery of the driving ring. Further, a plurality of the aperture cams are provided on the outer periphery of the drive ring, and a plurality of the receiving portions are provided at positions for holding the closing members at the open positions of the shutter openings corresponding to the plurality of aperture cams. It is preferable that the notch is provided between a plurality of receiving portions.

[0007]

Embodiments will be described with reference to the drawings.
In FIG. 1, a drive ring 1 for driving a diaphragm has a tooth portion 1a formed on a part of an outer periphery thereof, and meshes with a drive wheel 3 fixed to a motor shaft 2 of a drive motor (not shown). First, second and third aperture cams 1b, 1c, 1d for setting three stages of apertures are sequentially provided with different diameters on the outer periphery continuous with the tooth portion 1a. A receiving portion 1e and a notch 1f for the closing lever 6 for closing the shutter opening are provided continuously with the aperture cam 1d, and the receiving portion 1e and the notch 1f are connected to each other by an inclined surface 1g. A diaphragm lever 4 as a control member for adjusting the opening amount of the shutter opening is provided on the outer side of the drive ring 1 so as to be swingable about a shaft 4a as a rotation center, and a pin slidingly contacting the diaphragm cams 1b to 1d at one end. 4b, and the other end is a projection 4c. A spring 4d is hooked on the aperture lever 4, and a pin 4b
Are brought into elastic contact with the aperture cams 1b to 1d.

A sector lever 5, which is an opening / closing member for opening and closing the shutter opening, is provided adjacent to the aperture lever 4 so as to be swingable about a shaft 5a, and can be joined to a projection 4c on one arm. The following arm is provided with a pin 5c for driving a sector ring described later, and the remaining arm is provided with a projection 5d. A spring 5e for urging the sector lever 5 to open the shutter opening is provided.
The pin 5b is moved by the spring to the projection 4c.
I am in contact with it. At a position adjacent to the sector lever 5,
A closing lever 6 is provided. That is, the closing lever 6 is provided so as to be swingable about a shaft 6a as a center of rotation, and one end of the closing lever 6 is provided with a protruding portion 6b joined to the protruding portion 5d. A protrusion 6c that can be joined to the portion 1e is provided. A magnetic body 6d that can be attracted to the electromagnet 7 is fixed to the other end. The closing lever 6 has a spring 6
The hook e is engaged so that the projection 6b can be elastically contacted with the projection 5d and the projection 6c can be elastically contacted with the drive ring 1.

FIG. 2 shows a mechanism for opening and closing the sector in conjunction with the swing of the sector lever 5. This is drive ring 1
A sector ring 8 is provided rotatably at a position concentric with the drive ring 1. A U groove 8 into which the pin 5c of the sector lever 5 is fitted is formed on the outer peripheral portion of the sector ring 8.
a is formed, and the sector ring 8 can be rotated by the swing of the sector lever 5. On the back side of the sector ring 8, drive pins 8b,
8c and 8d protrude. At the outer position of the sector ring 8, the swing center shafts 9a, 10a and 11a having the same distance from the rotation center of the sector ring 8 and equidistantly spaced from a motor board (not shown) provided with a drive motor (not shown). The sectors 9, 10, and 11 are swingably supported on the shaft. Driving pins 8b, 8c and 8d are fitted into the sectors 9, 10 and 11, and slidable long grooves 9b,
10b and 11b are provided. Each sector is positioned so that adjacent ones partially overlap. The inner peripheries 9c, 10c and 11c of each sector are located at positions where the shutter opening 12 is fully opened in the state of FIG.
And 11 are shaped so that the shutter opening 12 can be closed.

Next, the operation will be described. The state shown in FIG. 1 is the initial position, in which the pin 4b is in elastic contact with the first aperture cam 1b, and the projection 6c is in elastic contact with the receiving portion 1e. In this state, as shown in FIG. 2, the sector ring 8 is at the initial position, and the sectors 9, 10, and 11 are swinging counterclockwise, and the shutter opening 12 is fully opened. When adjusting the aperture of the shutter, power is supplied to the electromagnet 7, and the magnetic body 6d is attracted to the electromagnet 7, whereby the swing of the closing lever 6 is regulated. Next, a motor (not shown) is driven to rotate the motor shaft 2 and the pinion 3 rotates clockwise. As shown in FIG. 3, the drive ring 1 is rotated counterclockwise by the rotation of the pinion 3,
The pin 4b is moved from the first aperture cam 1b to the second aperture cam 1c.
When the elastic contact position is changed, the aperture lever 4 swings clockwise against the spring force of the spring 4d. The protrusion 6c is separated from the receiving portion 1e by the rotation of the drive ring 1, but its position is held by the attractive force of the electromagnet 7. Further, with the above-mentioned clockwise swing of the aperture lever 4, the projection 4
c, the pin 5b is pushed, and the sector lever 5 is
The pin 5c swings counterclockwise against e, and the pin 5c moves leftward. By this movement, the sector ring 8 is rotated clockwise through the U groove 8a in FIG. Then drive pin 8
b, 8c and 8d move, and the long grooves 9b, 10b and 11
By swinging the sectors 9, 10 and 11 via b, the sectors 9c, 10c and 11c are advanced toward the center to narrow down the opening range of the shutter opening 12. At a position where a desired shutter aperture is obtained, the power supply of the CCD is turned on and exposure of the subject image to the image pickup device is started.

When a desired exposure amount is obtained, the shutter opening 12 is closed immediately. In this operation, as shown in FIG. 4, when the power supplied to the electromagnet 7 is cut off, the attraction force of the electromagnet 7 disappears, and the closing lever 6 causes the projection 6c to hit the notch 1f by the spring force of the spring 6e. Swing clockwise until they touch. During this swing, the projection 6b pushes the projection 5d, swings the sector lever 5 counterclockwise against the spring 5e, and moves the pin 5c to the left. By this movement, the sector ring 8 is rotated clockwise in FIG. 2, and the sectors 9, 10, and 11 are swung in conjunction with the rotation to instantaneously close the shutter opening 12. Thereafter, the power of the CCD is turned off to stop the exposure. When the imaging of the subject image is completed in this way, each member is returned to the initial state. At this time, a motor (not shown) is driven to rotate in the opposite direction to rotate the pinion 3 counterclockwise via the motor shaft 2. Due to this rotation, the drive ring 1 rotates clockwise, and while the pin 4b reaches the position where it comes into elastic contact with the first aperture cam 1b, the protrusion 6c slides on the inclined surface 1g from the notch 1f to receive the receiving portion 1e. , The closing lever 6 swings counterclockwise against the spring force of the spring 6e, and the magnetic body 6d reaches a position adjacent to the electromagnet 7 and returns to the initial state of FIG. .

FIG. 5 shows a time chart at the time of such an imaging operation. That is, in the normal state, the shutter opening 12
Is a fully opened state (the pin 4b is in elastic contact with the first aperture cam 1b), and the electromagnet 7 is turned on to narrow the range of the shutter opening 12 (the pin 4b is in elastic contact with the second aperture cam 1c). At times, the exposure is started by turning on the CCD. When the predetermined exposure amount is obtained, when the electromagnet 7 is turned off, the sector swings and the shutter opening 12 is instantly closed.
Thereafter, the CCD is turned off. When it is desired to further close the shutter than in the above case, as shown in FIG. 6, the rotation of the motor shaft 2 is further continued, and the drive ring 1 is further rotated counterclockwise. Since the pin 4b changes the elastic contact position from the second stop cam 1c to the next third stop cam 1d, the swing of the stop lever 4 and the sector lever 5 in the same manner as described above causes the sector ring 8 to move further clockwise. , And the sectors 9, 10 and 11 are further swung toward the center. In this way, the aperture range of the shutter opening 12 is further reduced to a desired aperture. In this case, the imaging operation is the same as described above.

FIG. 7 shows another embodiment. In addition to the structure described in FIG.
Inside, two receiving portions 1h and 1i are formed to protrude. The receiving portions 1h and 1i have the inclined surface 1 as in the case of the receiving portion 1e.
The notches 1m and 1n are continuous with j and 1k. Other configurations are the same as those in FIG. 1, and thus are denoted by the same reference numerals. In the operation of this embodiment, the operation of adjusting the shutter aperture from FIG. 7 to FIG. 8 is the same as that described with reference to FIG. 3, and a desired exposure amount is obtained in this aperture state to close the shutter opening. Is the same as that described with reference to FIG. However, this embodiment differs from the previous embodiment in that the electronic camera displays a movie for a long time with the adjusted shutter aperture. Some electronic cameras use a viewfinder to determine a shooting position and display an image on a liquid crystal screen for confirmation after shooting. In addition, there are other electronic cameras that shoot while looking at an image displayed on a liquid crystal screen instead of a viewfinder. Other embodiments are primarily used for this latter type of electronic camera.

As shown in FIG. 10, when the electric power is supplied to the electromagnet 7 and the magnetic body 6d is attracted to the electromagnet 7 and the swing of the closing lever 6 is regulated, the motor is driven and the motor shaft 2 is moved. The pinion 3 rotates clockwise, the drive ring 1 rotates counterclockwise, and the pin 4b changes its elastic contact position from the first aperture cam 1b to the second aperture cam 1c. At this time, while the projection 6c of the closing lever 6 is separated from the receiving portion 1e and passes through the notch 1f, its position is held by the attractive force of the electromagnet 7, and the projection 6c is moved to the receiving portion 1h.
The supply of electric power to the electromagnet 7 is cut off at the position facing.
That is, in the state shown in FIG. 10, the pin 4b is set to the second aperture cam 1c.
However, no power is supplied to the electromagnet 7, and the state of the aperture is maintained by the receiving portion 1h.
In this state, a long-time movie display is performed on the liquid crystal screen of the camera, so that power to the electromagnet 7 during this time can be saved.

When the imaging operation is completed and the shutter opening is closed, power is supplied to the electromagnet 7 so that the magnetic body 6d is moved to the electromagnet 7
Then, a motor (not shown) is driven so as to rotate in the same direction as above, the pinion 3 is rotated clockwise through the motor shaft 2, the drive ring 1 is rotated counterclockwise, and the pin The motor is stopped when 4b moves toward a position where it comes into elastic contact with the third aperture cam 1d, and when the protrusion 6c reaches a position facing the notch 1m. Here, when the supply of power to the electromagnet 7 is cut off, the attraction force of the electromagnet 7 disappears as in the case of FIG. 9, the closing lever 6 swings by the spring force of the spring 6e, and the projection 6c becomes the notch. Contact 1m. This swing momentarily closes the sectors 9, 10 and 11 and closes the shutter opening as described above. The operation of returning to the initial state in FIG. 7 is the same as that of the previous embodiment, the driving ring 1 is driven to rotate clockwise, and the protrusion 6c is shifted from the notch 1m to the inclined surface 1j, the receiving portion 1h, the notch 1f, The surface 1g is sequentially slid to ascend to the receiving portion 1e, the magnetic body 6d reaches a position adjacent to the electromagnet 7, and returns to the initial state of FIG. When it is desired to further narrow the shutter than in the above case, when the projection 6c is received by the receiving portion 1h, power is supplied to the electromagnet 7 to hold the closing lever 6, and the drive ring 1 is moved in the same manner as above. The power supply to the electromagnet 7 may be turned off when the projection 6c is rotated counterclockwise and reaches the position where the projection 6c can be received by the receiving portion 1i.

[0016]

The present invention is embodied in the form described above and has the following effects. The opening / closing member controls the opening amount of the shutter opening, that is, the aperture is controlled, and the shutter opening is closed by the opening / closing member. Therefore, only one member for the aperture and the closing is required, and no separate member is required. That makes the configuration simple.

[Brief description of the drawings]

FIG. 1 is a plan view of a drive unit that adjusts a diaphragm and opens and closes a shutter opening.

FIG. 2 is a plan view showing a fully opened state of a shutter opening as viewed from the rear surface side of FIG. 1;

FIG. 3 is a plan view of a driving portion in a state where an aperture is adjusted.

FIG. 4 is a plan view of a driving portion in a state where imaging is completed and a shutter opening is closed.

FIG. 5 is a time chart illustrating an imaging operation.

FIG. 6 is a plan view of a driving portion in a state where the aperture is further adjusted.

FIG. 7 is a plan view of another embodiment of a driving portion for adjusting the aperture and opening and closing the shutter opening.

FIG. 8 is a plan view of a driving portion in a state where an aperture in FIG. 7 is adjusted.

9 is a plan view of a driving portion in a state in which imaging in FIG. 8 is completed and a shutter opening is closed.

FIG. 10 is a plan view of a driving portion in a state where the diaphragm in FIG. 8 is further adjusted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive ring 1b, 1c, 1d Aperture cam 1e, 1h, 1i Receiving part 1f, 1m, 1n Notch part 4 Control member (aperture lever) 5 Opening / closing member (sector lever) 6 Closing member (closing lever) 7 Electromagnet 8 Closing Member (sectoring) 9, 10, 11 Closing member (sector) 12 Shutter opening

Claims (4)

[Claims] 1. An image pickup device capable of being exposed by energization, an opening and closing member for opening and closing a shutter opening, a control member for adjusting an opening amount of the shutter opening, a closing member for closing the shutter opening, and the closing member. An electromagnet capable of being attracted, wherein the opening / closing member is normally held at an open position and a biasing force is applied in a direction to open the shutter opening, and the control member is linked to a diaphragm cam, and the opening / closing member is The closing member drives the opening / closing member to close the shutter opening when released from the attraction by the electromagnet. An electronic camera that starts exposure of the subject image by energization when the shutter opening is in an open state and stops exposure when the shutter opening is closed; Shutter. 2. The closing member according to claim 1, wherein the aperture cam is provided on an outer periphery of a drive ring that is driven to reciprocate and rotate, and an outer periphery of the drive ring is configured to close the shutter opening. A shutter for an electronic camera, wherein a notch portion is provided to allow movement of the shutter. 3. The shutter according to claim 2, wherein a receiving portion for holding the closing member at an open position of the shutter opening is provided on an outer periphery of the driving ring. 4. The aperture cam according to claim 3, wherein a plurality of aperture cams are provided on an outer periphery of the drive ring, and the receiving portion opens the shutter opening corresponding to the plurality of aperture cams. A plurality of notches are provided at positions to be held at positions, and the cutouts are provided between the plurality of receiving portions.