JP2001033844A - Exposure adjusting device and electronic camera using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an exposure adjusting device having both a function as a diaphragm device and a function as a shutter device, and an electronic camera equipped with the same. SOLUTION: This exposure adjusting device is constituted so that a diaphragm aperture may be formed by superposing and arranging plural blade members 21 to 27. In such a case, the members 21 to 27 are constituted of 1st blade groups 21 to 23 and 26 moving respectively to change the area of the diaphragm aperture, and 2nd blade groups 24, 25 and 27 moving respectively to change the area of the diaphragm aperture and shielding the diaphragm aperture formed by plural blade members, and the device is equipped with a blade moving means for moving the 1st and the 2nd blade groups.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exposure adjusting device and an electronic camera using the same, and more particularly, to a function of a diaphragm device for adjusting an exposure amount to an image pickup device in an electronic camera or the like, The present invention relates to an exposure adjusting device having a function of a shutter device for blocking a subject light beam, and an electronic camera using the exposure adjusting device.

[0002]

2. Description of the Related Art Conventionally, a desired object image is exposed to a photographic film by exposing the desired object image to a camera or the like, or the desired object image is converted into an electric image signal using an image sensor or the like. An electronic camera or the like that records this as an electric signal in a predetermined form is provided with an exposure adjusting device for adjusting the amount of incident light of a light flux from a subject that passes through a photographic lens and enters the camera. It is usually done.

A general exposure adjusting device in a conventional camera or the like is a diaphragm device that adjusts the amount of incident light by changing an opening diameter of an opening on a camera body side provided on an optical axis of a light beam transmitted through a photographing lens. With the opening of the camera body in the open state, a predetermined amount of incident light is irradiated on the light-receiving surface of the film, while the opening is closed to prevent the incident light from being irradiated on the light-receiving surface of the film. Is configured by a shutter device or the like for controlling the shutter speed.

In a conventional aperture adjusting apparatus, the aperture diameter of the aperture is adjusted by, for example, two blade members, and the two blade members are moved further than a position where the minimum aperture diameter is obtained. Thus, a configuration in which the aperture is completely shielded from light, and thereby has both the function of the diaphragm device and the function of the shutter device, has been put to practical use.

However, in the conventional exposure adjusting device in which the aperture device is constituted by the two blade members and the like as described above, and the aperture device also functions as a shutter device, the aperture device formed by the aperture blades It is difficult to ensure the accuracy of the aperture diameter, and particularly when a small-diameter aperture is used, a predetermined aperture shape cannot be ensured. Therefore, the aperture aperture accuracy tends to be insufficient. Therefore, there is a problem that a good photographing result cannot be obtained.

Therefore, if a diaphragm device is constituted by a plurality of blade members of three or more, the aperture opening shape can be made appropriate, so that the aperture opening accuracy at the time of small-diameter aperture can be ensured and good photographing results can be obtained. You can get it.

However, when a diaphragm device is constituted by three or more diaphragm blades, a plurality of thin plate-shaped blade members are generally arranged in an overlapping manner, and the respective blade members are integrated with each other. In general, the diaphragm blade group is configured to be driven by a driving force of an actuator or the like via a predetermined cam mechanism or the like.

With such a configuration, the aperture opening diameter is changed from the minimum aperture diameter to the open aperture diameter so as to have a desired size while optimizing the shape of the aperture opening diameter. A diaphragm device that adjusts the amount of light can be realized.

However, according to this configuration, there is a problem that the aperture cannot be closed by the respective aperture blades, and the incident light beam cannot be completely shielded.

For this reason, the conventional aperture device constituted by a plurality of aperture blades cannot be configured to share the function as a shutter device. Therefore, in a conventional exposure adjustment device which requires the accuracy of the aperture diameter of the aperture blades, a shutter device is generally provided independently of an aperture device consisting of a plurality of aperture blades. It is a target.

In this case, in a state where the exposure operation accompanying the photographing is not performed, the shutter device completely blocks the incident light beam into the camera to prevent the light receiving surface of the film from being exposed. When running
This serves to secure the optical path of the subject light beam so that the subject light beam is reliably irradiated onto the light receiving surface of the film for a predetermined time. For this purpose, for example, a structure in which two thin plate-shaped blade members are arranged in an overlapping manner and opened and closed by a driving force of an actuator or the like using a predetermined cam mechanism or the like is generally put to practical use. I have.

On the other hand, in an electronic camera or the like that records an electric image signal representing a subject image acquired by an image pickup device on a predetermined medium, recently, in order to record an image signal representing a still image with good image quality, All pixel signals that constitute one still image, that is, all pixel signals that can be acquired by all light receiving elements in an effective imaging area that constitutes an imaging element such as a CCD, are acquired by a single exposure operation. Pixel readout method (so-called progressive method) CC
D is generally adopted.

In the electronic camera employing the progressive CCD, when unnecessary incident light is applied to each light receiving element during execution of a transfer process for transferring a pixel signal captured by each light receiving element, A noise signal or the like may be mixed in the image signal being transferred, causing a so-called smear phenomenon or the like.

In order to prevent this, the front surface of the light receiving surface of the CCD is opened and closed, and a predetermined incident light beam is applied to the CCD during the exposure operation.
In general, a mechanical shutter mechanism configured to shield the light receiving surface of the CCD is provided while the light receiving surface of the CD is irradiated while the image signal is being transferred.

[0015]

However, for the reasons described above, the construction of the exposure adjusting device so as to use both the diaphragm device and the shutter device while focusing on the aperture opening accuracy is also required in electronic cameras and the like. It is difficult. Therefore, a conventional electronic camera or the like generally has an exposure adjusting device in which an aperture device and a shutter mechanism are independently configured.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object the purpose of providing a diaphragm device having a simple structure and also having the function of a shutter device, as required. A closed state in which the optical path (opening) of the incident light beam from the subject transmitted through the photographing lens can be completely blocked can be set, while at the time of the exposure operation, the set predetermined aperture diameter can be secured with high accuracy. It is an object of the present invention to provide an exposure adjusting device which is obtained and an electronic camera having the same.

[0017]

In order to achieve the above object, an exposure adjusting apparatus according to a first aspect of the present invention has an exposure adjusting apparatus configured to form a diaphragm aperture by arranging a plurality of blade members in an overlapping manner. Wherein the plurality of blade members change the area of the aperture opening by moving each of the plurality of blade members, and the plurality of blade members change the area of the aperture opening by moving each of the plurality of blade members. A second blade group that shields a diaphragm opening formed by a member; and a blade moving unit that moves the first blade group and the second blade group. And

According to a second aspect of the present invention, in the exposure control apparatus according to the first aspect, the blade moving means moves the first blade group and the second blade group in conjunction with each other. Movement control in the movement range of the second blade group, and moving the second blade group only without moving the first blade group.
The movement control is performed in the movement range of.

According to a third aspect, in the exposure adjusting apparatus according to the second aspect, a cam having a cam groove formed in each of the plurality of blade members and a cam pin engaged with the cam groove. And a blade moving means having a driving unit for driving the cam plate.
The portion corresponding to the second movement range of the cam groove of each blade member constituting the blade group is formed in a shape that does not move the first blade group even when the cam plate is driven. The portion corresponding to the second movement range of the cam groove of each blade member forming the blade group moves only the second blade group in the second movement range by driving the cam plate. It is characterized in that it is formed in a shape to be made.

According to a fourth aspect of the present invention, in the exposure control apparatus according to the third aspect, each of the blade members constituting the second blade group has a thin plate shape, and each of the blade members is arranged in an overlapping manner. It is characterized in that it has a laminated form.

According to a fifth aspect of the present invention, in the exposure adjusting apparatus according to the fourth aspect, a guide member that does not contribute to forming a diaphragm opening is sandwiched between predetermined ones of the plurality of blade members. It is characterized by having.

According to a sixth aspect, in the exposure adjusting apparatus according to the fifth aspect, the guide member is configured to be movable by the blade moving means.

An electronic camera according to a seventh aspect of the present invention is the electronic camera according to the first aspect.
Or a photographing lens unit having an exposure adjusting device according to any one of the second, third, fourth, fifth and sixth aspects of the present invention.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a main block diagram showing the internal configuration of an electronic camera using an exposure adjusting device according to an embodiment of the present invention.

As shown in FIG. 1, the electronic camera 1 performs exposure adjustment by adjusting the light amount of a plurality of lenses 11a for forming an optical object image and a light beam O (hereinafter, referred to as an object light beam) from the object. Section 1, which is an exposure adjusting device for
1b, a motor for moving a predetermined lens among a plurality of lenses 11a of the photographing lens unit 11 in the optical axis direction to execute a magnification operation, a focusing operation, and the like; A plurality of driving means such as motors provided for driving the plurality of blade members and the like, and a driving mechanism (not shown) connected to these driving means
A motor drive control circuit 32 for controlling the drive of the motor 31;
An image pickup device 12 such as a CCD for converting an optical object image formed by the plurality of lenses 11a into an electric signal to generate an image signal of a predetermined form, and an image signal acquired by the image pickup device 12 And an A / D conversion circuit 1 for converting an output signal (analog signal) from the imaging circuit 13 into a digital signal
4 (simply abbreviated as A / D in FIG. 1),
A built-in memory 15 which is a buffer memory such as a nonvolatile memory for temporarily storing an image signal converted into a digital signal by the / D conversion circuit 14, and a digital image signal stored in the built-in memory 15 is stored in a predetermined image data file. A detachable memory 37 composed of a non-volatile memory or the like, which is a recording medium for recording as, a card slot 36 for mounting the detachable memory 37 at a predetermined position of the electronic camera 1, and a detachable memory 37 loaded in the card slot 36. In this case, the card interface unit 16 (in FIG. 1, simply abbreviated as I / F) composed of an electric circuit such as a controller for performing data control while securing an electrical connection between the two.
An external input / output terminal 18 to which a cable (not shown) for electrically connecting the electronic camera 1 to an external information device or the like (not shown) or the like can be detachably provided; It comprises an electric circuit or the like for securing an electrical connection between the output terminal 18 and the electronic camera 1, and outputs predetermined image data including predetermined image signals and various image information accompanying the external signals to an external information device. And the like, and an external interface (I / F) unit 17 for performing data control so as to receive an input signal from an external information device or the like connected to the external input / output terminal 18 and stored in the built-in memory 15. The converted digital image signal is converted into a signal in a form optimal for displaying as a video image on a CRT or LCD, or an image signal in a form optimal for reproducing and displaying image data from the detachable memory 37. Raw Etc., and various video output circuit 19 for executing image processing or the like in displaying an image, is controlled by the video output circuit 19, the video output circuit 1
CRT which is a display device for displaying a display image signal generated by the display unit 9 and various kinds of image information accompanying the display image signal
Or, an image display device (LCD) 20 such as an LCD, a power supply battery 34 for supplying predetermined electric power to various electric circuits and the like constituting the electronic camera 1, and power supply control means for controlling the power supply battery 34. The electronic camera 1 includes a power supply unit 33, a strobe light emitting unit 35 for irradiating auxiliary illumination light to a desired subject at the time of photographing, a system controller 41 for controlling the entire electronic camera 1, and the like.

Next, the detailed structure of the diaphragm 11b, which is an exposure adjusting device provided inside the photographing lens unit 11 of the electronic camera 1 configured as described above, will be described below. FIG. 2 is an exploded perspective view showing a detailed configuration of the diaphragm 11b of the photographing lens unit 11 in the electronic camera 1 of the present embodiment. Also, FIG.
It is a principal part enlarged longitudinal sectional view which expands and shows 1b.

The components constituting the diaphragm 11b are held by a housing 28. This housing 28
Is formed in a substantially circular dish shape, and a substantially central portion is provided with a circular opening 28e for allowing a subject light beam to pass therethrough. The motor 3 is located near the periphery of the opening 28e.
1 to a plurality of blade members (21 and 22) to be described later.
, 23, 24, 25, 26, 27) is formed with a diaphragm plate receiving portion 28f in which a diaphragm plate 29 as a blade moving means for transmitting to each of the blades is provided. A first step 28g is formed at the periphery. The first step portion 28g has five bosses 28a rotatably supporting a plurality of blade members (21 to 27).
Are planted on the same circumference at substantially equal intervals.

A second step 28b is formed on the outer peripheral edge of the first step 28g.
8b, a separator 30 described later is provided. A wall forming the outer peripheral portion of the housing 28 is formed on the outer peripheral portion of the second step portion 28b.

A motor support 28d is integrally formed at a predetermined position near the outer periphery of the housing 28.
A hole 28c is provided in the motor support 28d so that a pinion gear 31a fixed to the rotation shaft of the motor 31 can be rotatably arranged.

The diaphragm plate 29 serving as the blade moving means is formed of a substantially annular plate member, and an opening 29c having substantially the same shape as the opening 28e of the housing 28 is formed in a substantially central portion. .
In the vicinity of the outer peripheral edge of the diaphragm plate 29, five cam pins 29b are planted on the same circumference at substantially equal intervals in a direction perpendicular to the plate member. Further, at a predetermined position on the outer peripheral portion of the aperture plate 29, a gear member 29a having a substantially arc shape and having a gear portion 29aa formed on the outer peripheral surface is integrally formed.

When the diaphragm plate 29 is disposed in the diaphragm plate receiving portion 28f of the housing 28, the motor supporting portion 28d
A pinion gear 31a is disposed in the hole 28c of the pinion, and the pinion gear 31a meshes with the gear portion 29aa. Thus, the rotational driving force of the motor 31 is transmitted to the diaphragm plate 29 via the gear member 29a, and the diaphragm plate 29 can be rotated by a predetermined amount in a predetermined direction.

The plurality of blade members include a plurality of aperture blades 21 to 21.
25 and two guide blades 26 and 27, and each blade member is formed in a predetermined shape by a thin plate member such as a metal. Each blade member has a cam groove 21 having a predetermined shape at a predetermined position.
b ・ 22b ・ 23b ・ 24b ・ 25b ・ 26b ・ 27b
Are formed. Note that these cam grooves (21b to 2b)
7b) controls the movement of a plurality of blade members by being cam-engaged in a predetermined combination with five cam pins 29b implanted in the diaphragm plate 29.

That is, the five bosses 28a of the housing 28
As described above, the first diaphragm blade 21 which is a plurality of diaphragm blades
The holes 21a, 22a, 23a, 24a, 25a formed in the bases of the second diaphragm blade 22, the third diaphragm blade 23, the fourth diaphragm blade 24, and the fifth diaphragm blade 25 are rotatable. Be pivoted. Also, two predetermined bosses 28
With respect to a, holes 26a and 27a formed in respective base portions of a first guide blade 26 and a second guide blade 27, which are two guide blades, are rotatably supported respectively. At the same time, the cam grooves (21b to 27b) of each blade member
b) is engaged with each of the five cam pins 29b of the aperture plate 29.

Therefore, when the diaphragm plate 29 is rotated in conjunction with the driving force of the motor 31, the cam pins 29b move along the cam grooves (21b to 27b) of each blade member and act on each blade member. I do. Thereby, each blade member rotates in a predetermined direction about each boss 28a as a rotation center. In this way, each blade member can change the opening area of the opening 28e and can open and close the opening 28e (more detailed operation will be described later).

Here, the arrangement of each blade member will be described.
They are arranged as follows. That is,
The first diaphragm blade 21, the second diaphragm blade 22, the first guide blade 26, and the third diaphragm blade 23 are arranged in this order from a position near the diaphragm plate 29. A separator 30 is disposed thereon, and the fourth diaphragm blade 24, the second guide blade 27, and the fifth diaphragm blade 25 are arranged on the opposite side (upper side in FIG. 3) of the diaphragm plate 29 across the separator 30. (See FIGS. 2 and 3).

In this case, the first diaphragm blade 21 and the first guide blade 26 are rotatably supported coaxially by the same boss 28a, and are rotatably supported by the second diaphragm blade 22.
And the second guide blade 27 are rotatably supported coaxially by the same boss 28a.

The separator 30 is disposed on the second step 28b of the housing 28 as described above. In the separator 30, an opening having substantially the same shape as the opening 28e is formed in a substantially central portion, and a cam pin 29b of a diaphragm plate 29 penetrates an outer peripheral edge of the separator 30 to rotate the diaphragm plate 29. The cam pin 29b moves along with the predetermined length 5
Two circumferential grooves 30b are formed on the same circumference. Further, five bosses 28a of the housing 28 penetrate through the outer periphery thereof, and holes 30a for positioning the separator 30 with respect to the housing 28 are formed at predetermined positions.

Therefore, the throttle section 11b of the present embodiment is
Are arranged in a form in which the respective blade members are stacked. As shown in FIG. 3, the first member indicated by the reference symbol D on one side (the side of the diaphragm plate 29) with the separator 30 interposed therebetween. The blade group of the first diaphragm blade 21.
The second diaphragm blade 22, the first guide blade 26, and the third diaphragm blade 23 are arranged in this order. On the other hand, on the other side of the separator 30 (the side opposite to the diaphragm plate 29 with the separator 30 interposed therebetween), a second blade group indicated by a reference symbol U is
From the side of the fourth diaphragm blade 24, the second guide blade 27, the fifth
The aperture blades 25 are arranged in this order.

FIG. 4 is an enlarged view showing a part of the aperture portion 11b, that is, only the first blade group and the aperture plate 29. FIG. 5 is a part of the aperture portion 11b. Second
FIG. 4 is an enlarged view of a main part, showing only the blade group and the aperture plate 29 of FIG.

FIGS. 4 and 5 respectively show states when the aperture 11b is in a closed state of blocking the opening 28e. 4 and 5, illustration of the separator 30 is omitted to avoid complication of the drawings. The state at this time is a state where the first blade group is set so that the opening 28e has the minimum aperture (see FIG. 4), and the opening 28e is completely shielded by the second blade group. The closed state is set (see FIG. 5). Then, this state, that is, a state in which FIGS. 4 and 5 are overlapped with each other is a state corresponding to FIG. 10 described later (a fully closed state of the opening).

The operation of the thus configured exposure adjusting apparatus according to the present embodiment will be described below with reference to FIGS. FIGS. 6, 7, 8, 9, and 10 are views for explaining the operation when a plurality of blade members constituting a part of the present exposure adjusting device (aperture portion 11 b) move. Each state when the area of the aperture opening 40 formed by the blade member changes is shown. That is, FIG. 6 shows the open state where the aperture opening 40 is maximized, and FIG. 7 shows the base end 22 of the second aperture blade 22.
FIG. 8 shows a state immediately before the distal end portion 23c of the third diaphragm blade 23 overlaps the third diaphragm blade 23c.
FIG. 9 shows a state immediately before the tip portion 25c of the aperture blade 25 overlaps, and FIG. 9 shows a minimum aperture state where the aperture aperture 40 is minimum.
0 indicates a fully closed state in which the opening 28e is completely shielded. 6 to 10,
In order to avoid complication of the drawing, illustration of the separator 30 is omitted.

First, when the motor 31 is driven in the open state shown in FIG. 6, when the diaphragm plate 29 is rotated in a predetermined direction, that is, counterclockwise in FIG.
The cam pin 29b of the aperture plate 29 also rotates in the same direction. The cam pins 29b are engaged with the cam grooves (21b to 27b) of the blade members (21 to 27), respectively, so that the blade members (21 to 27) pivot the five bosses 28a around the center. Rotate clockwise. As a result, the aperture 40 formed by the blade members (21 to 27) changes in a direction in which the area decreases as shown in FIGS.

Thus, each blade member (21 to 27)
Is rotated in a predetermined direction by the driving force of the motor 31 transmitted through the aperture plate 29, and the tip 23c of the third aperture blade 23 is moved to the second aperture blade 2 as shown in FIG.
2 is in a state of being close to the base end portion 22c.

By the way, in the diaphragm portion 11b of the present embodiment, a plurality of thin plate-shaped diaphragm blades 21 to 25 are arranged so as to overlap with each other.
It is rotatably supported at one point by the boss 28a. Therefore, when each of the diaphragm blades 21 to 25 moves in the direction in which the diaphragm blades 21 to 25 are closed, and when the blade members in the open state are not overlapped with each other, the blade members are overlapped with each other. Thus, there is a possibility that predetermined blade members interfere with each other and the respective aperture blades 21 to 25 are not arranged at predetermined positions.

As described above, when the aperture blades 21 to 25 are not arranged at predetermined positions, the subsequent movement of the aperture blades 21 to 25 may be hindered, and the opening 28e is blocked. It is also conceivable that the state cannot be realized.

In view of this, in the present embodiment, the following means is provided in order to always maintain a predetermined arrangement even when each of the aperture blades 21 to 25 moves. ing.

That is, when the two diaphragm blades in the non-overlapping state are overlapped with each other as they move to the closed state in the open state of the diaphragm, the diaphragm blades are located between the diaphragm blades. , Guide the movement of each aperture blade,
Guide vanes (26/27) to prevent interference between them
Are arranged so as to sandwich them.

In the diaphragm portion 11b of the present embodiment, specifically, the first guide blade 26 is disposed between the second diaphragm blade 22 and the third diaphragm blade 23, and the fourth diaphragm blade 24 and the fifth diaphragm blade 24 are arranged. By arranging the second guide blade 27 between the diaphragm blade 25 and the second guide blade 25, interference between these diaphragm blades is prevented.

Accordingly, when the diaphragm plate 29 further rotates counterclockwise from the state shown in FIG. 7 and the respective diaphragm blades move, the second diaphragm blade 22 is moved to the lower surface side of the first guide blade 23 in FIG. While moving along, the third diaphragm blade 23 moves along the upper surface side of the first guide blade 23 in FIG. Thereby, the tip portion 23c of the third diaphragm blade 23
May collide with the end face of the base end portion 22c of the second diaphragm blade 22, or the tip portion 23c of the third diaphragm blade 23 may fall under the second diaphragm blade 22 as shown in FIG. The blades 22 and 23 do not interfere. That is, as described above, the arrangement of the respective blade members is always maintained in the order of the second aperture blade 22, the first guide blade 26, and the third aperture blade 23.

FIG. 8 shows that each of the blade members (21 to 27) rotates in a direction to close the aperture opening 40 in accordance with the rotation of the aperture plate 29 in the counterclockwise direction in FIG. The tip 25c of the fifth diaphragm blade 25 is
It approaches the base end portion 24c of the aperture blade 24.

In this case, as described above, the fourth
Since the second guide blade 27 is disposed between the diaphragm blade 24 and the fifth diaphragm blade 25, both the diaphragm blades 24 and 2
5 are guided by the second guide blades 27 as shown in FIG. This allows both diaphragm blades 24
The blades 25 move without interfering with each other, and the arrangement of the blade members is always maintained in the order of the fourth diaphragm blade 24, the second guide blade 27, and the fifth diaphragm blade 25.

In this manner, the turning operation of each of the aperture blades 21 to 25 is continued without any trouble, and the minimum aperture state shown in FIG. 9 is obtained. Here, the first diaphragm blade 21 and the second diaphragm blade 2
Each movement of the first blade group including the second guide blade 26 and the third diaphragm blade 23 is regulated by the shapes of the cam grooves 21b, 22b, 26b, and 23b provided on each blade member. Become.

In other words, the range between the position in the open state shown in FIG. 6 and the position in the minimum aperture state shown in FIG.
In the movement range of (1), the first blade group and the second blade group move in conjunction with each other, so that the aperture portion 11b functions as an aperture device.

Next, when the diaphragm plate 29 is further rotated counterclockwise from the minimum diaphragm state shown in FIG. 9, the first blade group does not move, and the second blade group, that is, the fourth diaphragm blade is moved. 24
The second guide blade 27 and the fifth aperture blade 25
It further moves in a predetermined direction about the rotation center 8a. Then, as shown in FIG. 10, a fully closed state is obtained in which the opening 28e is completely blocked from light.

In this case, the first blade group is the first blade group.
Each blade member (21.
22/26/23) cam groove (21b / 22b / 26b)
The shape of 23b) is formed, and the shape of the cam groove restricts each blade member from moving further from the minimum drawing state toward the closing direction.

On the other hand, each blade member of the second blade group (24
27 and 25) are provided in each of the cam grooves (24
b, 27b, 25b) are the first within the first movement range.
The aperture plate is formed so as to be able to operate as an aperture device in conjunction with the blade group of the aperture plate 2.
When the blade 9 rotates, each blade member (24, 27, 25) is moved in the second movement range in conjunction with the rotation. Then, the cam grooves (24b, 27b, 25) are provided so that the fully closed state is ensured by the second blade group.
The shape of b) is formed.

That is, each cam groove (21b) of the first blade group
22b, 26b, 23b) and the shape of the cam grooves (24b, 27b, 25b) of the second blade group are formed differently. The blade group can move only within the first movement range, and the second blade group can move within the first movement range and the second movement range.

As described above, the second blade group moves in the first movement range in conjunction with the first blade group, so that the aperture portion 11b functions as an aperture device and is shown in FIG. In the second movement range between the position in the minimum aperture state and the position in the fully closed state shown in FIG. 10, only the second blade group moves, so that the aperture unit 11b functions as a shutter device. become.

In this embodiment, since the blade members 21 to 27 are simply arranged so as to overlap each other, even when the blade members 21 to 27 are in the fully closed state shown in FIG. It is also conceivable that a slight amount of light leakage will occur.

However, in an electronic camera or the like, the light receiving sensitivity is lower than that of a film even when a light beam having a predetermined light amount or less reaches the light receiving surface of the image pickup device when a pixel signal is transferred after the exposure operation. In addition, since predetermined signal processing can be easily performed on the acquired image signal, it is easy to remove a noise signal or the like caused by an unnecessary incident light beam. Therefore, the adverse effects of these unnecessary incident light beams on the pixel signals during transfer may be considered to be negligible.

On the other hand, when changing from the fully closed state in FIG. 10 to the open state in FIG. 6 through the minimum aperture state in FIG.
Is rotated clockwise in each figure.
Is performed. Thereby, as described above, the cam grooves 21b to 27b of the respective blade members 21 to 27
The blade members 21 to 27 move in a predetermined direction by the action of the cam engagement between the blade members 21 and the cam pins 29b.

At this time, in the second movement range, only the second blade group moves to release the blocking state of the opening 28e,
In the first moving range, the first blade group and the second blade group move together to change the area of the aperture opening 40 formed by each of the aperture blades 21 to 25, and
Secure the opening diameter of

As described above, according to the above-described embodiment, while the diaphragm portion 11b having the five diaphragm blades 21 to 27 functions as a normal diaphragm device, some of the diaphragm blades (fourth diaphragm blade 21 to 27) are used. The fifth diaphragm blades 24 and 25) can be further moved from the minimum diaphragm state (the state in FIG. 9), so that the diaphragm part 11b can also function as a shutter device. As a result, an exposure adjusting device easily having both the function of the aperture device and the function of the shutter device is realized.

Further, the aperture 4 is formed by a plurality of aperture blades.
Since 0 is formed, even when the aperture 40 is small, a highly accurate aperture diameter can be secured. Therefore, good photographing results can always be obtained.

Since the first and second guide blades 26 and 27 are arranged at predetermined positions required by the arrangement of the respective aperture blades 21 to 25, the respective aperture blades 21 to 25 are arranged at the predetermined positions. When the plate 29 moves in a predetermined direction in accordance with the turning operation of the plate 29, interference between predetermined diaphragm blades is prevented, and the arrangement of the respective diaphragm blades 21 to 25 can be always maintained. Therefore, the moving operation of each of the aperture blades 21 to 25 can be reliably ensured.

[0066]

As described above, according to the present invention, the diaphragm device is provided with a function as a shutter device with a simple structure, and the incident light flux from the subject transmitted through the photographing lens is provided as necessary. An exposure adjusting device configured to be able to set a fully-closed state in which an optical path (opening) is completely shielded and to ensure a highly accurate aperture formed by using a plurality of aperture blades; An electronic camera provided with the electronic camera can be provided.

[Brief description of the drawings]

FIG. 1 is a main block diagram showing the internal configuration of an electronic camera using an exposure adjusting device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a detailed configuration of an exposure adjusting device (aperture unit) in the electronic camera of FIG.

FIG. 3 is an enlarged longitudinal sectional view showing a main part of the exposure adjusting device (aperture portion) shown in FIG. 2 in an enlarged manner.

FIG. 4 is an enlarged view of a main part, showing only a first blade group and a diaphragm plate which are a part of the exposure adjusting device (aperture unit) of FIG. 2;

FIG. 5 is an enlarged view of a main part, showing only a second blade group and a diaphragm plate which are a part of the exposure adjusting device (aperture unit) of FIG. 2;

FIG. 6 is a view for explaining the operation of the exposure adjusting device (aperture portion) of FIG. 2, showing an open state in which an aperture opening formed by a plurality of blade members constituting a part of the exposure adjusting device is maximized. FIG.

FIG. 7 is a view for explaining the operation of the exposure adjusting device (aperture portion) of FIG. 2, and shows a tip of a third aperture blade with respect to a base end of a second aperture blade constituting a part of the exposure adjusting device; The figure which shows the state just before a part overlaps.

FIG. 8 is a view for explaining the operation of the exposure adjusting device (aperture portion) of FIG. 2, wherein a fifth diaphragm blade 25 is formed with respect to a base end of a fourth diaphragm blade constituting a part of the exposure adjusting device; The figure which shows the state just before a front-end part overlaps.

FIG. 9 is a view for explaining the operation of the exposure adjusting device (aperture portion) of FIG. 2, and is a diagram showing a minimum aperture state in which an aperture is minimized by a plurality of aperture blades constituting a part of the exposure adjusting device. .

FIG. 10 is a view for explaining the operation of the exposure adjusting device (aperture portion) of FIG. 2 and is in a fully closed state in which an opening is completely blocked by a second blade group constituting a part of the exposure adjusting device. FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electronic camera 11 ... Photography lens unit 11b ... Aperture part (exposure adjustment device) 12 ... Image sensor 21 ... 1st aperture blade (blade member; exposure adjustment device) 22 ... 2nd aperture blade (blade) Member: Exposure adjustment device) 23: Third aperture blade (blade member; exposure adjustment device) 24: Fourth aperture blade (blade member: exposure adjustment device) 25: Fifth aperture blade (blade member: exposure adjustment device) 26: first guide blade (blade member; exposure adjusting device) 27: second guide blade (blade member: exposure adjusting device) 21b / 22b / 23b / 24b / 25b / 26b / 2
7b Cam groove 28 Housing (aperture portion; exposure adjusting device) 28a Boss 28e Opening 29 Aperture plate (blade moving means) 29a Gear member 29aa Gear portion 29b Cam pin 30 Separator 31 Motor 32 Motor control circuit 41 System controller

 ──────────────────────────────────────────────────の Continued on the front page F-term (reference) 2H080 AA21 AA22 AA32 AA37 AA40 AA66 AA69 AA70 AA76 BB36 CC04 2H081 AA43 AA44 AA45 AA49 AA51 BB12 BB27 BB28 CC52 DD01 5C022 AA13 AB15 AB40 AC54 AC56

Claims (7)

[Claims] 1. An exposure adjusting device configured to form a diaphragm opening by arranging a plurality of blade members in an overlapping manner, wherein each of the plurality of blade members moves to reduce the area of the diaphragm opening. A first blade group to be changed, and a second blade group that changes the area of the aperture opening by moving each, and shields the aperture opening formed by the plurality of blade members. An exposure adjusting device, comprising: a blade moving unit configured to move the first blade group and the second blade group. 2. The blade moving means moves the first blade group and the second blade group in an interlocked manner in a first movement range, and moves the first blade group. The exposure control device according to claim 1, wherein movement control is performed in a second movement range in which only the second blade group is moved without moving. 3. The blade moving means having a cam groove formed in each of the plurality of blade members, a cam plate having a cam pin engaged with the cam groove, and a drive unit for driving the cam plate. And a portion corresponding to the second movement range of the cam groove of each of the blade members constituting the first blade group moves the first blade group even when the cam plate is driven. The portion corresponding to the second movement range of the cam groove of each blade member forming the second blade group is formed only in the second blade group by driving the cam plate. 3. The exposure adjusting device according to claim 2, wherein the exposure adjusting device is formed in a shape that moves the lens in the second movement range. 4. A blade according to claim 3, wherein each of said blade members constituting said second blade group is formed in a thin plate shape, and each of said blade members is in a laminated form arranged to be overlapped. Exposure adjusting device according to the above. 5. The exposure adjustment according to claim 4, wherein a guide member that does not contribute to forming a diaphragm opening is sandwiched between predetermined blade members of the plurality of blade members. apparatus. 6. The exposure adjusting device according to claim 5, wherein the guide member is configured to be movable by the blade moving means. 7. The method of claim 1 or claim 2, 3, 4, 5, or 6.
6. An electronic camera, comprising: a photographing lens unit having the exposure adjusting device according to any one of 6.