CN115843341A - Blade opening and closing apparatus and image forming apparatus - Google Patents

Abstract

Provided is a method for producing: a drive lever rotatable in a first rotational direction from a first rotational position to a second rotational position and a second rotational direction from the second rotational position to the first rotational position; a driving body that applies a driving force as a rotational force in a first rotational direction to the driving lever; a biasing spring that applies a driving force to the drive lever as a rotational force in a second rotational direction by biasing the drive lever; and an opening and closing blade that is operated in a closing direction to close the opening in accordance with a rotational operation of the drive lever in the first rotational direction, and is operated in an opening direction to open the opening in accordance with an operation of the drive lever in the second rotational direction. A driving force in the first rotational direction is applied from the driving body in a state where the driving force from the biasing spring is not applied to the driving lever, and a driving force in a second rotational direction is applied from the biasing spring in a state where the driving force from the driving body is not applied to the driving lever.

Description

Blade opening and closing apparatus and image forming apparatus

Technical Field

The present technology relates to the technical field of a blade opening and closing device having an opening and closing blade for opening and closing an opening through which light is transmitted, and an image forming apparatus including the blade opening and closing device.

Background

In various imaging apparatuses such as video cameras and still cameras, there is provided an imaging element that photoelectrically converts light captured by an optical system including a lens group and an optical element. In such an imaging device, for example, at the time of imaging a subject, light is controlled by a focal plane shutter serving as a blade opening and closing device, and is incident on an imaging element.

In some blade opening and closing apparatuses, a base body formed with an opening, an opening and closing blade that moves (travels) relative to the base body, and a drive lever that applies a drive force to the opening and closing blade are provided, and an opening and closing operation that opens and closes the opening of the blade is performed by a rotational operation of the drive lever (for example, see patent document 1 and patent document 2).

The drive lever rotates between a first rotational position (initial position) and a second rotational position. The opening and closing blade is, for example, at an opening position for opening the opening in a state where the drive lever is held at the first rotational position, and the opening and closing blade is, for example, at a closing position for closing the opening in a state where the drive lever is held at the second rotational position.

The blade opening and closing apparatus described in patent document 1 is provided with a first drive lever (in patent document 1, a first closing lever) and a second drive lever (in patent document 1, a second closing lever) which are respectively rotatable.

In the blade opening and closing apparatus described in patent document 1, a biasing force is always applied to the second drive lever by the tension coil spring, the second drive lever rotates against the biasing force of the tension coil spring, and the opening and closing blade is operated from the opening position to the closing position.

CITATION LIST

Patent document

Patent document 1: japanese patent application laid-open No. 2002-296641

Disclosure of Invention

Problems to be solved by the invention

Meanwhile, in the blade opening and closing apparatus described in patent document 1, it is configured to always apply the biasing force of the tension coil spring to the second drive lever, and when the opening and closing blade is operated from the opening position to the closing position, the second drive lever is rotated by the driving force against the urging force of the tension coil spring.

Therefore, when the opening and closing blade is operated from the open position to the closed position, a large driving force needs to be applied to the second driving lever, and therefore, there is a possibility that the size of the driving body applying the driving force to the second driving lever increases and power consumption increases. Further, in order to ensure a reliable and stable rotational state of the drive lever from the second rotational position to the first rotational position, it is desirable to increase the biasing force of the tension coil spring.

However, in this case, when the opening and closing blade is operated from the open position to the closed position, a larger driving force needs to be applied to the second driving lever, which further increases the size of the driving body and power consumption.

Therefore, one object of the blade opening and closing apparatus and the image forming apparatus of the present technology is to reduce the size and power consumption of the driving body.

Solution to the problem

First, the vane opening and closing apparatus according to the present technology includes: a drive lever rotatable in a first rotational direction from a first rotational position to a second rotational position and a second rotational direction from the second rotational position to the first rotational position; a driving body that applies a driving force as a rotational force in a first rotational direction to the driving lever; a biasing spring that applies a driving force to the drive lever as a rotational force in a second rotational direction by biasing the drive lever; and an opening and closing blade that is operated in a closing direction to close the opening in accordance with a rotational operation of the drive lever in the first rotational direction and is operated in an opening direction to open the opening in accordance with an operation of the drive lever in the second rotational direction, wherein a driving force in the first rotational direction is applied from the drive body in a state where the driving force from the biasing spring is not applied to the drive lever, and a driving force in the second rotational direction is applied from the biasing spring in a state where the driving force from the drive body is not applied to the drive lever.

Therefore, when the opening and closing blade is operated in the closing direction to close the opening, the rotating operation in the first rotating direction is performed in a state where the driving force is not applied from the biasing spring to the driving lever, and when the opening and closing blade is operated in the opening direction to open the opening, the rotating operation in the second rotating direction is performed in a state where the driving force is not applied from the driving body to the driving lever.

Second, in the above-described blade opening and closing apparatus, it is preferable that a blade return spring that biases the opening and closing blade in the opening direction and biases the drive lever in the second rotation direction be provided.

Therefore, the drive lever is rotated in the second rotational direction by the driving forces of both the biasing spring and the blade return spring.

Third, in the above-described blade opening and closing apparatus, it is preferable that the driving body is provided with a rotor, the driving lever is rotatable independently of a rotational operation of the rotor, the driving lever is rotated in the first rotational direction integrally with the rotor by a driving force of the driving body, and the driving lever is rotated in the second rotational direction independently of the rotor by a driving force of the biasing spring.

Accordingly, the drive lever is rotated in the first rotational direction by the driving force of the drive body, and is rotated in the second rotational direction by the driving force of the biasing spring.

Fourth, in the above-described vane opening and closing device, it is preferable that the rotor and a part of the drive lever are positioned to be opposed to each other in a rotational axis direction of the rotor, and the biasing spring is disposed between the opposed rotor and a part of the drive lever.

Therefore, the biasing spring is located between the rotor and the drive lever in the rotational axis direction of the rotor.

Fifth, in the above-described blade opening and closing apparatus, it is desirable that the driving lever be rotatable in the first rotational direction independently of the rotor when the driving body is not energized.

Therefore, when the drive lever rotates in the first rotational direction due to the occurrence of the impact while the rotor is not rotating, the drive lever rotates in the second rotational direction by a driving force different from that of the rotor and is held at the first rotational position.

Sixth, in the above-described vane opening and closing apparatus, it is preferable that the center of gravity of the rotor is located on the rotational axis.

Therefore, this makes it difficult for the rotor to rotate when an impact occurs.

Seventh, in the above-described vane opening and closing device, it is preferable that the rotational shaft of the rotor and the rotational shaft of the driving lever are the same.

Therefore, the rotation of the rotor and the rotation of the drive lever are performed around the same fulcrum.

Eighth, in the above-described vane opening and closing apparatus, it is preferable that the rotor is provided with a pressing part, the driving lever is provided with a pressed part pressed by the pressing part, and the driving lever is rotated in the first rotation direction by the driving force of the driving body when the pressed part is pressed by the pressing part.

Therefore, the driving force of the driving body is transmitted from the pressing portion to the pressed portion, and the driving lever rotates.

Ninth, in the above-described vane opening and closing device, preferably, a brake lever operable between a deceleration start position and a rotation stop position is provided, wherein when the brake lever is operated from the deceleration start position toward the rotation stop position, a rotational speed of the drive lever decreases when rotating in the first rotational direction.

Thus, the rotational speed of the drive lever is reduced by the brake lever when rotating in the first rotational direction.

Tenth, in the above-described vane opening and closing apparatus, it is preferable that a lever support portion is formed on the brake lever, and the drive lever rotated in the first rotation direction is supported by the lever support portion.

Therefore, since the rotational speed of the drive lever is decelerated by the brake lever and the drive lever is supported by the brake lever, it is not necessary to separately provide a member that decelerates the rotational speed of the drive lever and a member that supports the drive lever.

Eleventh, in the above-described vane opening and closing device, it is preferable that a brake stopper that presses the brake lever and stops the brake lever at the rotation stop position is provided, and the brake lever is stopped at the rotation stop position by the brake stopper, and the drive lever is held at the second rotation position.

Therefore, in a state where the brake lever is stopped at the rotation stop position by the brake stopper, the drive lever supported by the lever support portion is held at the second rotation position.

Twelfth, in the above-described blade opening and closing apparatus, it is preferable that a support base on which the drive lever is rotatably supported is provided, the drive lever is provided with a connecting shaft to which the opening and closing blade is connected, a position holding portion which holds the drive lever at the first rotational position is formed in the support base, and the drive lever is held at the first rotational position by pressing the connecting shaft against the position holding portion with a biasing force of the blade return spring.

Therefore, since the connecting shaft connected with the opening and closing blade is pressed against the position holding portion and the driving lever is held at the first rotational position, it is not necessary to separately provide a portion connecting the opening and closing blade to the driving lever and a portion holding the opening and closing blade at the first rotational position.

An image forming apparatus according to the present technology includes: a blade opening and closing device that controls light taken in through the optical system; and an imaging element that photoelectrically converts light taken in through the optical system, wherein the blade opening and closing apparatus includes: a drive lever rotatable in a first rotational direction from a first rotational position to a second rotational position and a second rotational direction from the second rotational position to the first rotational position; a driving body that applies a driving force as a rotational force in a first rotational direction to the driving lever; a biasing spring that applies a driving force to the drive lever as a rotational force in a second rotational direction by biasing the drive lever; and an opening and closing blade that is operated in a closing direction to close the opening in accordance with a rotational operation of the drive lever in the first rotational direction and is operated in an opening direction to open the opening in accordance with an operation of the drive lever in the second rotational direction, a driving force in the first rotational direction being applied from the drive body in a state where the driving force from the bias spring is not applied to the drive lever, and a driving force in the second rotational direction being applied from the bias spring in a state where the driving force from the drive body is not applied to the drive lever.

Therefore, in the blade opening and closing apparatus, when the opening and closing blade is operated in the closing direction to close the opening, the rotating operation in the first rotating direction is performed in a state where the driving force is not applied from the biasing spring to the driving lever, and when the opening and closing blade is operated in the closing direction to close the opening, the rotating operation in the second rotating direction is performed in a state where the driving force is not applied from the driving body to the driving lever.

Fourteenth, in the above-mentioned blade opening and closing apparatus, it is preferable that the blade opening and closing apparatus includes a driving block including a driving body and a mechanism block including an opening and closing blade,

the size of the driving block is smaller than that of the mechanism block in the moving direction of the opening and closing blade, the driving block is located on the outer peripheral side of the mechanism block, and the terminal portions are disposed on opposite sides of the outer peripheral side of the mechanism block in the moving direction of the opening and closing blade.

Therefore, the terminal portion is disposed in the space on the outer peripheral side of the mechanism block.

Drawings

Fig. 1 shows an embodiment of a blade opening and closing apparatus and an image forming apparatus of the present technology together with fig. 2 to 20, and is a perspective view of the image forming apparatus.

Fig. 2 is a perspective view showing the image forming apparatus viewed from a direction different from that in fig. 1.

Fig. 3 is a schematic side view of an image forming apparatus.

Fig. 4 is a perspective view of the vane opening and closing apparatus.

Fig. 5 is an exploded perspective view of the vane opening and closing apparatus.

Fig. 6 is an exploded perspective view showing a drive mechanism and the like.

Fig. 7 is a front view showing a state in which the opening and closing blade is held at the open position.

Fig. 8 is a front view showing a state where the opening and closing blade is held at the closed position.

Fig. 9 is an exploded perspective view of the rotor, biasing spring and drive rod.

Fig. 10 is a rear view of the rotor, biasing spring and drive rod.

Fig. 11 illustrates the operation of the vane opening and closing apparatus together with fig. 12 to 16, and is a rear view illustrating an initial state.

Fig. 12 is a rear view showing a state immediately after a closing operation of opening and closing the vanes is started.

Fig. 13 is a rear view showing a state in which the closing operation of the opening and closing blade is performed after fig. 12, the connecting shaft of the driving lever is in contact with the brake lever, and the driving lever is held at the second rotational position.

Fig. 14 is a rear view showing a state immediately after the opening operation of opening and closing the vanes is started.

Fig. 15 is a rear view illustrating a state in which the opening operation of the opening and closing blade is performed and the driving lever is separated from the brake lever after fig. 14.

Fig. 16 is a rear view showing a state where the connecting shaft is pressed against the position holding portion and the drive lever is held at the first rotational position.

Fig. 17 shows the operation of the blade opening and closing apparatus when an impact or the like occurs at the time of non-energization together with fig. 18, and is a rear view showing a state in which the drive lever is rotated toward the second rotational position.

Fig. 18 is a rear view showing a state in which the drive lever rotated toward the second rotational position is rotated to the first rotational position by the biasing force of the biasing spring or the like.

Fig. 19 is a rear view showing the positional relationship and the like between the drive block and the mechanism block.

Fig. 20 is a block diagram of the image forming apparatus.

Detailed Description

Hereinafter, a mode for carrying out the present technology will be described with reference to the drawings.

In the embodiments described below, the imaging apparatus of the present technology is applied to a still camera, and the blade opening and closing apparatus of the present technology is applied to a focal plane shutter provided in the still camera.

Note that the application range of the present technology is not limited to a still camera and a focal plane shutter provided in the still camera, and can be widely applied to, for example, various imaging apparatuses incorporated in video cameras and other apparatuses, and various blade opening and closing apparatuses such as an aperture provided in these imaging apparatuses.

In the following description, it is assumed that front, rear, up, down, left, and right directions are indicated as directions seen from a photographer when imaging with a still camera. Therefore, the object side is the front, and the photographer side is the rear.

Note that the front, rear, up, down, left, and right directions described below are for convenience of description, and implementation of the present technology is not limited to these directions.

Further, the lens group described below may include other optical elements such as one or more lenses and an aperture stop in addition to the optical elements configured by one or more lenses.

< schematic configuration of image Forming apparatus >

First, a schematic configuration of an image forming apparatus will be described (see fig. 1 to 3).

The image forming apparatus 1 includes necessary units disposed inside and outside a horizontally long flat housing 2 (see fig. 1 and 2), for example. As shown in fig. 1, the imaging apparatus 1 may be an apparatus capable of attaching and detaching an interchangeable lens 200.

The flash 3 is provided on the front surface of the housing 2. A shutter button 4, a zoom switch 5, and a power button 6 are provided on the upper surface of the housing 2 (see fig. 1 and 2). A display 7, various operation units 8, 8 …, and a viewfinder 9 are provided on the rear surface of the housing 2.

As shown in fig. 3, in the housing 2, an optical system 10 including a lens group, optical elements, and the like, a blade opening and closing device (focal plane shutter) 11 that controls the amount of light taken in by the optical system 10, and an imaging element 12 that photoelectrically converts light taken in via the blade opening and closing device 11 are arranged in this order from the front side.

< configuration of the vane opening and closing apparatus >

Hereinafter, the configuration of the blade opening and closing apparatus 11 will be described (see fig. 4 to 10).

The blade opening and closing apparatus 11 includes a base body 13, a pressing plate 14, an opening and closing blade 15, links 16, and a drive mechanism 17, and is disposed on the front surface side of the imaging element 12 (see fig. 4 to 6).

The base 13 is formed in a substantially rectangular shape that is long in the horizontal direction, for example, and has a rectangular opening 13a that penetrates in the front-rear direction (see fig. 4 and 5). The opening 13a is slightly larger than an effective incident area of light on the imaging surface of the imaging element 12, which is an area on which light captured by the optical system 10 and necessary for generating an image is incident.

A portion of the base 13 below the opening 13A is provided as a holding portion 18, the holding portion 18 serving as a holding area for holding the opening and closing blade 15 at the opening position, and a portion of the base 13 on the side of the opening 13A is provided as an attaching portion 19. An imaging element 12 is disposed on the rear side of the base 13.

Pin insertion holes 19a, 19a protruding forward are formed at the side ends of the attachment portion 19 so as to be vertically separated from each other. A shaft moving hole 19b is formed in the attachment portion 19, and the shaft moving hole 19b is formed in a substantially circular arc shape. The attachment portion 19 is provided with a spring hooking protrusion 19c protruding forward above the pin insertion holes 19a, 19 a.

The pressing plate 14 is formed in substantially the same size and shape as the base body 13, and has a through hole 14a. The pressing plate 14 is attached to the base body 13 from the front side, and the opening and closing blade 15 is interposed between the pressing plate and the base body 13. In a state where the pressing plate 14 is attached to the base 13, the opening 13a is positioned immediately rearward of the through hole 14a.

The pressing plate 14 has a gap hole 14b formed therein, and the gap hole 14b is formed in an arc shape. In a state where the pressing plate 14 is attached to the base body 13, the clearance hole 14b is located on the front side of the shaft moving hole 19 b.

The opening and closing blade 15 includes a plurality of sheet sections 15a,15a … (see fig. 5). In the blade opening and closing device 11 serving as a focal plane shutter, for example, a so-called electronic front curtain shutter is constituted by a combination of an electronic curtain serving as a front curtain by controlling the imaging element 12 and an opening and closing blade 15 provided as a mechanical structure and serving as a rear curtain.

The sections 15a,15a … are horizontally long, for example, four sections are provided. In the opening and closing blade 15, at least a part of the sections 15a,15a … overlap each other in the thickness direction. The sections 15a,15a … are pivotally coupled to the two links 16, respectively.

The links 16, 16 are formed in a sheet shape and function as parallel links. The support holes 16a, 16a are formed at one end portion in the longitudinal direction of the links 16, respectively. One link 16 is formed with a long coupling hole 16b at a portion near one end in the longitudinal direction. A spring hook hole 16c is formed in the other link 16.

Support pins, which will be described later, are inserted into the support holes 16a, 16a of the links 16, respectively, and the links 16 and 16 are turned with the support pins as fulcrums. The links 16, 16 rotate relative to the base body 13 and the pressing plate 14 while maintaining the parallel state.

As the links 16, 16 rotate, the sections 15a,15a … move (travel) in a substantially vertical direction. At this time, the movement amounts of the sections 15a,15a … are different, and the overlapping area is changed, so that the opening/closing operation is performed between the open position (refer to fig. 7) of opening the opening 13a of the base body 13 and the closed position (refer to fig. 8) of closing the opening 13a.

The moving direction of the opening and closing blade 15 from the opening position to the closing position is a closing direction, and the moving direction of the opening and closing blade 15 from the closing position to the opening position is an opening direction.

When the opening and closing blade 15 is moved as described above, the overlapping area of the sections 15a,15a … changes with the movement position, and this area is smallest at the opening position.

Therefore, since the arrangement space of the opening and closing blade 15 is reduced at the opening position, and the area of the opening and closing blade 15 is maximized at the closing position, the blade opening and closing apparatus 11 can be reduced in size in the moving direction of the opening and closing blade 15, and the opening 13a having a sufficient size can be formed.

Note that, between the opening and closing blade 15 and the front surface of the base body 13 and between the opening and closing blade 15 and the rear surface of the pressing plate 14, sheets (not shown) having light transmission holes positioned corresponding to the openings 13a are disposed, and the operation of opening and closing the blade 15 is smoothened by these sheets.

The drive mechanism 17 is configured by arranging necessary units on the support base 20 (see fig. 5 and 6).

The support base 20 is formed in a vertically long plate shape facing the front-rear direction. A substantially arc-shaped shaft operating hole 21 is formed in the support base 20 at a position near the lower end thereof. The shaft operation hole 21 is formed as a position holding portion 21A at one end edge in the longitudinal direction.

Support pins 20a, 20a protruding forward are provided on the support base 20 so as to be vertically separated from each other. A receiving protrusion 20b protruding rearward is provided on the outer peripheral portion of the support base 20.

The support pins 20a, 20a are inserted into the pin insertion holes 19a, 19a of the base 13 from the rear, and into the support holes 16a, 16a of the links 16, 16 from the rear, respectively. Therefore, the links 16, 16 pivot with respect to the base 13 and the pressing plate 14 using the support pins 20a, 20a as fulcrums, respectively.

The support base 20 is attached to the attachment portion 19 of the base main body 13 from the rear. In a state where the support base 20 is attached to the attaching portion 19, the shaft operating hole 21 is positioned immediately rearward of the shaft moving hole 19 b.

In a state where the support base 20 is attached to the attaching portion 19, the blade return spring 22 is supported by one support pin 20a (refer to fig. 7, 8). The blade return spring 22 is, for example, a torsion coil spring, and includes an annular coil portion 22a and arm portions 22b, 22b protruding from the coil portion 22 a.

In the blade return spring 22, a coil portion 22a is supported by the support pin 20a, one arm portion 22b is supported by the spring hooking protrusion 19c of the base 13, and the other arm portion 22b is inserted into and supported by the spring hooking hole 16c of the link 16. Therefore, the urging force in one rotational direction is applied to one link 16 by the blade return spring 22, the urging force of the blade return spring 22 is transmitted from the one link 16 to the opening and closing blade 15, and the opening and closing blade 15 is urged in the opening direction by the blade return spring 22.

The rotor shaft 23 is attached to the support base 20. The rotor shaft 23 protrudes rearward from the support base 20. A brake support portion 24 is provided on the back surface side of the support base 20. A brake stopper 25 projecting rearward is attached to the rear surface of the support base 20. The stopper support portion 24 and the stopper 25 are located around the shaft operating hole 21.

The drive mechanism 17 is provided with: a cover plate 26 attached to the support base 20; a drive body 27 partially attached to the cover plate 26; a drive lever 28 rotatable with respect to the support base 20; and a biasing spring 29 that biases the drive lever 28 (see fig. 4 to 6).

The lid plate 26 includes a lid face portion 26a facing the front-rear direction, and attachment projections 26b, 26b … projecting forward from the outer peripheral portion of the lid face portion 26a, the distal end portions of the attachment projections 26b, 26b … being attached to the support base 20 by screwing or the like.

The driving body 27 includes a yoke 30, a coil 31, and a rotor 32.

The yoke 30 is formed in a ring shape, attached to the cover face portion 26a of the cover plate 26 from the front, and located inside the attached projections 26b, 26b …. The coil 31 is attached in a state of being wound around a part of the yoke.

The rotor 32 includes a rotor base 33 including a resin material and a rotor magnet 34 attached to the rotor base 33 (refer to fig. 9, 10). The center of gravity of the rotor 32 is located at or near the axis of rotation.

The rotor base 33 includes an annular base portion 35 and a cylindrical portion 36 projecting rearward from a central portion of the base portion 35. The rotor magnet 34 is formed in a cylindrical shape, and is attached to the rotor base 33 in a state where the cylindrical portion 36 is inserted into the central portion and one end surface in the axial direction is in contact with the base portion 35.

A pressed portion 37, a pressing portion 38, an operating portion 39, and a spring support portion 40 that project toward the opposite side of the tube portion 36 are provided in this order and separated in the circumferential direction on the outer peripheral portion of the base portion 35.

The drive lever 28 includes a plate-shaped action base 41 formed in a predetermined shape and a connecting shaft 42 protruding forward from one end of the action base 41. The action base 41 has an annular rotation fulcrum portion 41a and an arm portion 41b protruding from the rotation fulcrum portion 41a, and the connection shaft 42 protrudes from a distal end portion of the arm portion 41 b. The action base 41 is provided with a pressed portion 41c protruding from a continuous portion of the rotation fulcrum portion 41a and the arm portion 41b, and the pressed portion 41c protrudes from the rotation fulcrum portion 41a in a direction different from the protruding direction of the arm portion 41 b.

The rotor shaft 23 is inserted into the rotation fulcrum portion 41a of the drive lever 28, and the drive lever is rotatably supported by the support base 20 with the rotor shaft 23 as a fulcrum.

In a state where the drive lever 28 is supported by the support base 20, the connecting shaft 42 of the drive lever 28 is inserted into the shaft operating hole 21 of the support base 20 and the shaft moving hole 19b of the base body 13, and is inserted into the gap hole 14b of the pressing plate 14. The connecting shaft 42 is inserted into a connecting hole 16b formed in one link 16 between the shaft moving hole 19b and the clearance hole 14b (see fig. 5). Therefore, when the drive lever 28 rotates, the connecting shaft 42 moves, the links 16, 16 rotate while maintaining the parallel state, and the sections 15a,15a … move in the substantially vertical direction with the rotation of the drive lever 28.

Further, in the rotor 32, the rotor shaft 23 is inserted into a portion extending from the base 35 to the cylindrical portion 36, and the rotor shaft 23 is allowed to rotate with respect to the support base 20 as a fulcrum (see fig. 6).

As described above, the drive lever 28 is rotatable about the rotor shaft 23 as a fulcrum, the rotor 32 is rotatable about the rotor shaft 23 as a fulcrum, and the rotational axis of the rotor 32 and the rotational axis of the drive lever 28 are the same.

Therefore, since the rotation of the rotor 32 and the rotation of the drive lever 28 are performed around the same fulcrum, the vane opening and closing apparatus 11 can be miniaturized.

The biasing spring 29 is, for example, a torsion coil spring, and includes an annular coil portion 29a and arm portions 29b, 29b protruding from the coil portion 29a (see fig. 6, 9, and 10).

In the bias spring 29, a coil portion 29a is supported by the rotor shaft 23, one arm portion 29b is supported by a spring supporting portion 40 of the rotor base 33 in the rotor 32, and the other arm portion 29b is supported by a pressed portion 41c of an acting base 41 in the drive lever 28. Therefore, the biasing force in the direction in which the pressing portion 38 and the pressed portion 41c approach each other is applied to the rotor 32 and the drive lever 28 in the opposite directions to each other.

In the blade opening and closing apparatus 11, the rotor 32 and the rotation fulcrum portion 41a of the drive lever 28 are positioned to face each other in the rotation axis direction of the rotor 32, and the biasing spring 29 is positioned between the rotor 32 and the rotation fulcrum portion 41a that are positioned to face each other (see fig. 10).

As described above, in the blade opening and closing apparatus 11, the rotor 32 and a part of the drive lever 28 are positioned to face each other in the rotational axis direction of the rotor 32, and the biasing spring 29 is disposed between the rotor 32 and a part of the drive lever 28 positioned to face each other.

Therefore, since the biasing spring 29 is located between the rotor 32 and the drive lever 28 in the rotational shaft direction of the rotor 32, the biasing spring 29 does not protrude outward from the rotor 32 in the radial direction of the rotor 32, and the vane opening and closing device 11 can be miniaturized.

In the drive body 27 configured as described above, when a current is supplied to the coil 31, the rotor 32 rotates in a direction corresponding to the current direction.

Further, the drive lever 28 rotates between a first rotational position, which is a rotational end in the direction of the biasing force of the biasing spring 29, and a second rotational position, which is a rotational end in the direction of the biasing force against the biasing spring 29. The direction of rotation of drive lever 28 from the first rotational position to the second rotational position is the first rotational direction and the direction of rotation of drive lever 28 from the second rotational position to the first rotational position is the second rotational direction.

The drive mechanism 17 is provided with a brake lever 43 (see fig. 6). The brake lever 43 is formed in a substantially V-shape and is rotatable about the brake support portion 24 of the support base 20. The brake lever 43 rotates between a deceleration start position where the drive lever 28 starts decelerating and a rotation stop position where the rotation stops.

The brake lever 43 is provided with a V-shaped bent portion as a supported plate portion 44, and the supported plate portion 44 is supported by the brake support portion 24. In the brake lever 43, a portion extending from the supported plate portion 44 to one side is provided as a brake arm 45, and a portion extending from the supported plate portion 44 to the other side is provided as an acting arm 46.

A recess, which is a lever support portion 44a, is formed at a side edge of the supported plate portion 44. The distal end portion of the brake arm 45 is provided with an operated portion 45a projecting rearward. The brake arm 45 is provided with a stopper portion 45b protruding rearward on an outer peripheral portion.

The brake lever 43 is supported on the brake support portion 24 by a support member 48 through a pressurizing spring 47. Therefore, the brake lever 43 is supported in a state in which a constant load is applied to the support base 20 by the pressurizing spring 47, and rotates with respect to the support base 20 when a rotational force larger than a frictional force with the support base 20 generated by the pressurizing spring 47 is applied.

< operation of the vane opening and closing apparatus >

Hereinafter, the operation of the vane opening and closing device 11 will be described (see fig. 7, 8, and 11 to 16).

First, an initial state of each unit in the drive mechanism 17 will be described (see fig. 7 and 11).

In an initial state before the power button 6 of the imaging apparatus 1 is operated, the coil 31 is not energized, the driving force is not generated in the driving body 27, and the rotation of the rotor 32 is stopped (see fig. 11). At this time, the rotor magnet 34 is attracted to the yoke 30 by a magnetic force, the rotor 32 is held at a predetermined rotational position by a positioning torque, and is pressed against the receiving projection 20b of the support base 20 by the pressing part 37.

In the initial state, the drive lever 28 is biased in the second rotational direction by the biasing force of the biasing spring 29, and the connecting shaft 42 presses the position holding portion 21a of the shaft operating hole 21 formed in the support base 20 and is held at the first rotational position. At this time, the pressing portion 38 of the rotor 32 comes into contact with or approaches the pressed portion 41c of the drive lever 28, and further, the biasing force in the second rotational direction of the blade return spring 22 is applied to the drive lever 28 via the links 16, 16 and the opening and closing blade 15, and the connecting shaft 42 presses the position holding portion 21a of the shaft operating hole 21 by the biasing force of the blade return spring 22 and is held at the first rotational position.

Note that, in the blade opening and closing apparatus 11, only the blade return spring 22 of the blade return spring 22 and the bias spring 29 may be provided. In this case, the drive lever 28 is held at the first rotational position by pressing the connecting shaft 42 against the position holding portion 21a by the biasing force of the blade return spring 22.

Further, in the blade opening and closing device 11, for example, the spring force of the blade return spring 22 is smaller than the spring force of the biasing spring 29.

In the initial state, the opening and closing blade 15 is biased in the opening direction by the blade return spring 22, and is held at the opening position (see fig. 7).

At this time, the imaging element 12 is in a closed state (non-exposure state) in which no light is incident through the electronic curtain (front curtain).

In the initial state, the brake lever 43 is held at the deceleration start position, and the brake arm 45 is separated from the connecting shaft 42 of the drive lever 28 (see fig. 11). At this time, in the brake lever 43, the acting portion 39 of the rotor 32 is in contact with the operated portion 45a, the stopper portion 45b is separated from the brake stopper 25, and the acting arm 46 is held at a position not overlapping with the shaft operating hole 21.

In the above initial state, when the coil 31 is energized, the opening and closing operation of the opening and closing blade 15 is started (see fig. 12). At this time, the control of the electronic curtain is started before the opening and closing operation of the opening and closing blade 15.

When the coil 31 is energized, the rotor 32 starts to rotate to one side, and the opening and closing blade 15 is operated from the open position to the closed position in the closing direction. When the operation of opening and closing the blade 15 from the open position toward the closed position is performed, in a state where a slit is formed between the electronic curtain and the opening and closing blade 15, the electronic curtain is controlled in accordance with the operation speed of the opening and closing blade 15, and light is incident on the imaging element 12 through the formed slit to perform exposure.

When the rotor 32 starts to rotate to one side, the pressed portion 41c of the drive lever 28 is pressed by the pressing portion 38 of the rotor 32, and the drive lever 28 rotates in the first rotation direction from the first rotation position to the second rotation position. The drive lever 28 rotates by being pressed by the pressing portion 38 of the rotor 32, and thus rotates integrally with the rotor 32. Therefore, when the drive lever 28 rotates in the first rotational direction, the biasing spring 29 also rotates together with the rotor 32 and the drive lever 28, the biasing force of the biasing spring 29 does not become a load on the rotor 32, and the rotor 32 rotates toward the second rotational position at high speed by the driving force of the drive body 27.

At this time, the operating portion 39 is separated from the operated portion 45a of the brake lever 43 as the rotor 32 rotates.

As described above, in the vane opening and closing apparatus 11, the pressing portion 38 is provided in the rotor 32, the pressed portion 41c pressed by the pressing portion 38 is provided in the drive lever 28, and the pressed portion 41c is pressed by the pressing portion 38, whereby the drive lever 28 is rotated in the first rotational direction by the driving force of the drive body 27.

Therefore, since the driving force of the driving body 27 is transmitted from the pressing portion 38 to the pressed portion 41c and the driving lever 28 rotates, the driving lever 28 can be reliably rotated with a simple structure.

With the rotation of the drive lever 28, the opening and closing blade 15 operates at high speed in the closing direction from the opening position to the closing position.

Subsequently, the coil 31 is energized, the rotor 32 is then rotated to one side, and the drive lever 28 is further rotated toward the second rotational position, thereby further operating the opening and closing blade 15 toward the closing position (see fig. 8, 11, and 13).

When the drive lever 28 is further rotated to the second rotation position, the connecting shaft 42 comes into contact with the brake arm 45 of the brake lever 43 held at the deceleration start position, and the brake lever 43 is pressed by the connecting shaft 42 and rotated from the deceleration start position to the rotation stop position against the frictional force with respect to the support base 20 (see fig. 13). Therefore, the rotational speed of the drive lever 28 is gradually reduced by the brake lever 43 as approaching the second rotational position, and the operating speed of the opening and closing blade 15 is also gradually reduced as approaching the closing position.

At this time, the connecting shaft 42 of the drive lever 28 is inserted into the lever supporting portion 44a of the brake lever 43, supported by the brake lever 43, and rotated to the second rotational position integrally with the brake lever 43.

When the stopper portion 45b of the stopper arm 45 comes into contact with the stopper 25 attached to the support base 20, the rotation of the stopper lever 43 is stopped and held at the rotation stop position. When the brake lever 43 is held at the rotation stop position, the rotation of the drive lever 28 is also stopped, and the drive lever 28 is held at the second rotation position.

At this time, the energization to the coil 31 is stopped, and the rotation of the rotor 32 is stopped.

In the state where the drive lever 28 is held at the second rotational position as described above, the opening and closing blade 15, which is operated in accordance with the rotation of the drive lever 28, reaches the closing position, the operation from the opening position to the closing position of the opening and closing blade 15 is terminated, and the opening and closing blade 15 is held at the closing position to close the opening 13a of the base 13 (see fig. 8).

As described above, the leaf opening and closing device 11 is provided with the brake lever 43 operable between the deceleration start position and the rotation stop position, and the brake lever 43 is operated from the deceleration start position toward the rotation stop position so that the rotational speed of the drive lever 28 is reduced when rotating in the first rotational direction.

Therefore, since the rotational speed of drive lever 28 is reduced by brake lever 43 when rotating in the first rotational direction, when drive lever 28 is rotated by the driving force of drive body 27, it is possible to prevent an impact from occurring due to contact with another member (e.g., support base 20) of drive lever 28, and to stably hold drive lever 28 at the second rotational position.

Further, a lever support portion 44a is formed in the brake lever 43, and the drive lever 28 rotated in the first rotation direction is supported by the lever support portion 44a.

Therefore, since the rotational speed of the drive lever 28 is decelerated by the brake lever 43 and the drive lever 28 is supported by the brake lever 43, it is not necessary to separately provide a member for decelerating the rotational speed of the drive lever 28 and a member for supporting the drive lever 28, and it is possible to ensure an appropriate operating state of the drive lever 28 while reducing the number of components.

Further, a brake stopper 25 that presses the brake lever 43 to stop the brake lever 43 at the rotation stop position is provided, and the drive lever 28 is held at the second rotation position by the brake lever 43 stopped at the rotation stop position by the brake stopper 25.

Therefore, since the drive lever 28 supported by the lever support portion 44a is held at the second rotational position in a state where the brake lever 43 is stopped at the rotation stop position by the brake stopper 25, the drive lever 28 can be held at the second rotational position in a stable state in a state supported by the brake lever 43.

When the operation of opening and closing the vanes 15 from the open position to the closed position is completed, the operation of opening and closing the vanes 15 from the closed position to the open position is subsequently started. When the operation of opening and closing the vanes 15 from the closed position to the open position is started, the imaging element 12 enters a closed state (non-exposure state) in which no light is incident through the electronic curtain.

The operation of opening and closing the vanes 15 from the closed position to the open position is started by energizing the coil 31 in the direction opposite to the previous direction and rotating the drive lever 28 with the rotation of the rotor 32.

When the coil 31 is energized in the opposite direction, the rotor 32 starts to rotate to the other side (see fig. 14). When the rotor 32 starts to rotate to the other side, the rotor 32 rotates independently of the rotation of the drive lever 28, since the drive lever 28 is held at the second rotational position by the brake lever 43.

At this time, since the driving lever 28 is not rotated even if the rotor 32 rotates, the opening and closing blade 15 is maintained at the closed position.

When the rotor 32 is rotated to the other side to a certain position, the operated portion 45a of the brake lever 43 is pressed by the acting portion 39 in accordance with the rotation of the rotor 32 (see fig. 15). The operating portion 39 presses the operated portion 45a, whereby the brake lever 43 rotates from the rotation stop position to the deceleration start position.

When the brake lever 43 is rotated from the rotation stop position toward the deceleration start position, the drive lever 28 supported by the brake lever 43 is rotated in the second rotation direction from the second rotation position to the first rotation position in accordance with the rotation of the brake lever 43, and the connecting shaft 42 is separated from the brake lever 43. Therefore, the driving lever 28 is released from the state supported by the brake lever 43.

At this time, the opening and closing blade 15 is operated from the closed position to the open position in the opening direction with the rotation of the drive lever 28.

Since the drive lever 28 is biased in the second rotational direction by the leaf return spring 22 and the biasing spring 29, when the support state of the brake lever 43 is released, the biasing forces of the leaf return spring 22 and the biasing spring 29 are used as the driving force, and the drive lever rotates toward the first rotational position at high speed (see fig. 16).

At this time, since the rotor 32 is rotated to the other side before the drive lever 28 is rotated, the rotor magnet 34 is kept in a state of being attracted to the yoke 30 by a magnetic force and returned to the initial state by the positioning torque, and the pressed portion 37 is brought into a state of being pressed against the receiving projection 20b of the support base 20. When the rotor 32 returns to the initial state, the energization of the coil 31 is stopped.

As described above, in the leaf opening and closing device 11, the acting portion 39 is provided in the rotor 32, the operated portion 45a is provided in the brake lever 43, the brake lever 43 is operated from the rotation stop position toward the deceleration start position by pressing the operated portion 45a by the acting portion 39, and the supported state of the lever supported portion 44a of the drive lever 28 is released by the operation of the brake lever 43 from the rotation stop position toward the deceleration start position.

Therefore, when the operated portion 45a is pressed by the operating portion 39 of the rotor 32 and the brake lever 43 is operated from the turning stop position to the deceleration start position, the support state of the brake lever 43 with respect to the drive lever 28 is released. Therefore, in accordance with the turning operation of the rotor 32, the supported state of the brake lever 43 with respect to the drive lever 28 is released, and the drive lever 28 can be reliably turned from the second turning position toward the first turning position, while the structure is simplified, without the need for the dedicated drive body 27 that applies a driving force for operating the brake lever 43 from the turning stop position toward the deceleration start position.

When the drive lever 28 is pressed by the operated portion 45a, the support state of the drive lever 28 by the lever support portion 44a is released.

Therefore, since the operated portion 45a has both the function of operating the brake lever 43 from the rotation stop position toward the deceleration start position by the driving force of the rotor 32 and the function of pressing the drive lever 28 to release the support state of the drive lever 28 by the lever support portion 44a, the drive lever 28 can be reliably rotated from the second rotation position toward the first rotation position while simplifying the structure of the brake lever 43.

When the connecting shaft 42 is pressed against the position holding portion 21a of the shaft operating hole 21, the drive lever 28 rotated in the second rotational direction is stopped, and is held at the first rotational position.

At this time, the brake lever 43 is held at the deceleration start position, the operating portion 39 of the rotor 32 is in contact with the operated portion 45a, and the stopper portion 45b is separated from the brake stopper 25.

The connecting shaft 42 of the drive lever 28 is pressed against the position holding portion 21a by the biasing forces of the blade return spring 22 and the biasing spring 29, and is held at the first rotational position.

As described above, in the blade opening and closing apparatus 11, the support base 20 on which the drive lever 28 is rotatably supported is provided, the connecting shaft 42 to which the opening and closing blade 15 is connected is provided to the drive lever 28, the position holding portion 21a that holds the drive lever 28 at the first rotational position is formed in the support base 20, and the drive lever 28 is held at the first rotational position by pressing the connecting shaft 42 against the position holding portion 21a.

Therefore, since the connecting shaft 42 connected to the opening and closing blade 15 is pressed against the position holding portion 21a and the drive lever 28 is held at the first rotational position, it is not necessary to separately provide a portion for connecting the opening and closing blade to the drive lever 28 and a portion for holding the opening and closing blade 15 at the first rotational position, and the drive lever 28 can be reliably held at the first rotational position while simplifying the configuration of the drive lever 28.

The opening and closing blade 15 is operated in the opening direction with the rotation of the drive lever 28, and the drive lever 28 is held at the opening position by being held at the first rotational position (see fig. 7).

As described above, in the imaging apparatus 1, a so-called electronic front curtain shutter is constituted by a combination of an electronic curtain serving as a front curtain and opening and closing blades 15 provided as a mechanical structure and serving as a rear curtain.

Some imaging devices use an electronic shutter that electronically executes both the front curtain and the rear curtain. In this case, the front curtain is performed with the charge cleared, while the rear curtain is performed by successive readings. However, in the case of an electronic shutter, since the speed is limited by the reading speed of the sensor, there is a possibility that a problem called rolling shutter distortion, in which an image obtained by photographing a moving object is distorted, may be caused. On the other hand, there is an imaging apparatus using a shutter that mechanically performs both front and rear curtains. In this case, drive mechanisms of both the drive mechanism of the front curtain and the drive mechanism of the rear curtain are required, and there is a risk of an increase in the size of the image forming apparatus and an increase in the number of components.

Therefore, by adopting the configuration of the electronic front curtain shutter by the combination of the electronic curtain and the opening and closing blade 15 as in the imaging apparatus 1, it is possible to suppress the occurrence of rolling shutter distortion while suppressing an increase in the size and an increase in the number of components of the imaging apparatus 1.

Note that, although an example in which the opening and closing blade 15 is operated from the opening position to the closing position by the driving force of the driving body 27 has been described above, it is also possible to provide a spring mechanism that applies a biasing force from the opening position to the closing position to the opening and closing blade 15 and rotates the driving lever 28 in the first rotation direction using the biasing force of the spring mechanism as the driving force to operate the opening and closing blade 15 from the opening position to the closing position.

< operation of the vane opening and closing apparatus when it is not energized >

Next, an operation when an impact occurs at the time of non-energization in which the coil 31 is not energized in the image forming apparatus will be described (see fig. 17 and 18).

There is a case where, for example, when the user moves the imaging apparatus 1 in a state where the power is not turned on before the power button 6 is operated, or the imaging apparatus 1 is accidentally dropped, an impact is generated in the imaging apparatus 1.

In this case, the rotor 32 is hardly rotated since it is held in the initial state by the detent torque, but the drive lever 28 and the opening and closing blade 15 are rotated in the first rotational direction against the biasing forces of the blade return spring 22 and the biasing spring 29 in accordance with the magnitude and the direction of the force applied at the time of impact from the first rotational position to the second rotational position (see fig. 17).

At this time, in the initial state, the brake lever 43 is held at the deceleration start position in a state where the operating portion 39 of the rotor 32 is in contact with the operated portion 45a. Therefore, since the rotor 32 does not rotate, the brake lever 43 does not rotate from the deceleration start position to the rotation stop position.

The drive lever 28 is rotatable from the first rotational position to the second rotational position to a position where the action base 41 contacts the operated portion 45a of the brake lever 43. At this time, the opening and closing blade 15 is operated in the closing direction toward the closed position with the rotation of the drive lever 28.

When the force due to the impact is reduced, the drive lever 28 and the opening and closing blade 15 are rotated in the second rotational direction toward the first rotational position by the biasing forces of the blade return spring 22 and the biasing spring 29 (see fig. 18). At this time, since the biasing forces of both the blade return spring 22 and the biasing spring 29 are applied to the drive lever 28 and the opening and closing blade 15, the drive lever 28 is rotated at high speed toward the first rotational position, and the opening and closing blade 15 is operated at high speed toward the opening position.

When the connecting shaft 42 is pressed against the position holding portion 21a of the shaft operation hole 21, the rotation of the drive lever 28 rotated in the second rotational direction is stopped and held at the first rotational position, and the opening and closing blade 15 operated in the opening direction is held at the open position.

As described above, in the blade opening and closing apparatus 11, when the driving body 27 is not energized, the driving lever 28 can be rotated in the first rotation direction independently of the rotor 32.

Therefore, when the drive lever 28 rotates in the first rotational direction due to an impact generated when the rotor 32 does not rotate, the drive lever 28 rotates in the second rotational direction by a driving force different from that of the rotor 32, and is held at the first rotational position. Therefore, the drive body 27 does not need to have a large positioning torque for holding the drive rod 28 at the first rotational position, and the drive body 27 can be miniaturized and power consumption can be reduced.

Further, after the drive lever 28 is rotated in the first rotational direction due to the generation of the impact, the drive lever 28 is rotated in the second rotational direction by the biasing forces of both the blade return spring 22 and the biasing spring 29 and is held at the first rotational position, so that the rotation in the second rotational direction is performed at a high speed and by a large driving force.

Therefore, it is possible to suppress occurrence of bouncing due to springback when the connecting shaft 42 in the drive lever 28 comes into contact with the position holding portion 21a, and the time from the rotation of the drive lever 28 in the first rotational direction to the return to the first rotational position is shortened, so that the user can use the image forming apparatus 1 quickly after the occurrence of an impact, and usability can be improved.

Further, since the center of gravity of the rotor 32 is located on or near the rotational axis, the rotor 32 is less likely to rotate when an impact occurs, and the drive lever 28 can be prevented from rotating in the first rotational direction as the rotor 32 rotates.

< summary >

As described above, in the image forming apparatus 1 and the blade opening and closing apparatus 11, the drive lever 28 is made rotatable independently of the rotational operation of the rotor 32, the drive lever 28 is rotated in the first rotational direction integrally with the rotor 32 by the driving force of the drive body 27, and the drive lever 28 is rotated independently of the rotor 32 in the second rotational direction at least by the biasing force of the blade return spring 22.

Therefore, the rotation of the drive lever 28 in the first rotational direction is performed together with the rotor 32, and the rotation of the drive lever 28 in the second rotational direction is performed separately from the rotor 32, and the drive lever 28 is held at the second rotational position by at least the biasing force of the blade return spring 22. Therefore, it is not necessary to rotate drive lever 28 toward the second rotational position by generating a driving force in drive body 27 that overcomes the magnitude of detent torque, and it is possible to reduce power consumption and reduce the size of drive body 27.

Further, a biasing spring 29 is provided, which is supported between the rotor 32 and the drive lever 28 and biases the drive lever 28 in the second rotational direction.

Therefore, since biasing spring 29 that biases drive lever 28 in the second rotational direction is supported between rotor 32 and drive lever 28, and drive lever 28 rotates in the first rotational direction integrally with rotor 32, the biasing force of biasing spring 29 does not become a load to the driving force of drive body 27 when drive lever 28 rotates in the first rotational direction. Therefore, the driving force of the drive body 27 that rotates the drive lever 28 in the first rotation direction can be reduced. Further, since the drive lever 28 is rotated in the second rotational direction by the biasing forces of both the blade return spring 22 and the biasing spring 29, the drive lever 28 can be reliably rotated to the first rotational position at high speed.

Further, in the image forming apparatus 1 and the blade opening and closing apparatus 11, the driving force in the first rotational direction is applied from the driving body 27 in a state where the driving force is not applied from the biasing spring 29 to the driving lever 28, and the driving force in the second rotational direction is applied from the biasing spring 29 in a state where the driving force is not applied from the driving body 27 to the driving lever 28.

Therefore, when the opening and closing blade 15 is operated in the closing direction to close the opening 13a, the rotating operation in the first rotating direction is performed in a state where the driving force is not applied to the drive lever 28 from the biasing spring 29, and when the opening and closing blade 15 is operated in the opening direction to open the opening 13a, the rotating operation in the second rotating direction is performed in a state where the driving force is not applied to the drive lever 28 from the driving body 27.

Therefore, when the opening and closing blade 15 is operated from the open position to the closed position, a large driving force does not need to be applied to the driving lever 28, and the size and power consumption of the driving body 27 can be reduced.

Further, since the blade return spring 22 that biases the opening and closing blade 15 in the opening direction and biases the drive lever 28 in the second rotation direction is provided, the drive lever 28 is rotated in the second rotation direction by the driving forces of both the biasing spring 29 and the blade return spring 22, so that the drive lever 28 can be rotated at high speed in the second rotation direction to shorten the operation time.

Further, drive body 27 having rotor 32 is provided as a drive body so that drive lever 28 can be rotated independently of the rotational operation of rotor 32, drive lever 28 is rotated in the first rotational direction integrally with rotor 32 by the drive force of drive body 27, and drive lever 28 is rotated in the second rotational direction independently of rotor 32 by the drive force of biasing spring 29.

Therefore, since drive lever 28 is rotated in the first rotational direction by the drive force of drive body 27 and rotated in the second rotational direction by the drive force of biasing spring 29, drive lever 28 can be reliably and smoothly rotated in the first rotational direction and the second rotational direction with a simple structure.

< others >

The vane opening and closing device 11 mainly includes a driving block 50 and a mechanism block 60, the driving block 50 including a driving lever 28, a yoke 30, a coil 31, a rotor 32, and a brake lever 43, and the mechanism block 60 mainly including a base 13, a pressing plate 14, and an opening and closing vane 15 (see fig. 19).

As described above, the drive block 50 mainly includes the drive lever 28, the yoke 30, the coil 31, the rotor 32, and the brake lever 43, has a simple structure, and is reduced in size.

As described above, in the image forming apparatus 1, since the size of the driving block 50 is reduced, the width of the driving block 50 in the moving direction (vertical direction) of the opening and closing blade 15 is smaller than the width of the mechanism block 60. Therefore, in a state where the driving block 50 is disposed at the mechanism block 60 side, an arrangement space may be formed at both sides of the driving block 50 in the moving direction of the opening and closing blade 15 inside the housing 2.

Therefore, in the image forming apparatus 1, the terminal portions 70, 70 are disposed on both sides of the driving block 50 in the moving direction of the opening and closing blade 15. The terminal section 70 is, for example, a terminal of a headphone, a terminal of a microphone, or a terminal for connecting with an external device such as a high-definition multimedia interface (HDMI: registered trademark) or a Universal Serial Bus (USB).

As described above, in the image forming apparatus 1, the size of the driving block 50 in the moving direction of the opening and closing blade 15 is made smaller than the size of the mechanism block 60, the driving block 50 is located on the outer peripheral side of the mechanism block 60, and the terminal portions 70, 70 are arranged on the opposite side of the outer peripheral side of the mechanism block 60 with the driving block 50 interposed therebetween in the moving direction of the opening and closing blade 15.

Therefore, since the terminal portions 70, 70 are arranged in the space on the outer peripheral side of the mechanism block 60, the image forming apparatus 1 can be miniaturized by effectively utilizing the arrangement space.

< one embodiment of image Forming apparatus >

Hereinafter, a configuration example of an embodiment of an imaging apparatus according to the present technology will be described (see fig. 20).

The imaging apparatus 1 includes a camera block 90 having an imaging function, a camera signal processing unit 91 that performs signal processing such as analog-to-digital conversion of a captured image signal, and an image processing unit 92 that performs recording/reproducing processing of the image signal. Further, the imaging apparatus 1 includes a display unit 93 (display 7) that displays a photographed image or the like, a reader/writer (R/W) 94 that writes and reads an image signal to and from a memory 100, a Central Processing Unit (CPU) 95 that controls the entire imaging apparatus 1, a lens drive control unit 96 that controls the drive of lenses arranged in a camera block 90, and an operation unit 97 (shutter button 4, zoom switch 5, power button 6, operation unit 8, and the like) such as various switches on which a user performs a desired operation.

The camera block 90 may be provided as an interchangeable lens 200.

The imaging apparatus 1 is provided with an imaging element 12 such as a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS) that converts an optical image taken by the camera block 90 into an electric signal.

The camera signal processing unit 91 performs various types of signal processing on the output signal from the imaging element 12, such as conversion into a digital signal, noise removal, image quality correction, and conversion into a luminance/chrominance signal.

The image processing unit 92 performs compression encoding/expansion decoding processing of an image signal, conversion processing of a data specification such as resolution, and the like based on a predetermined image data format.

The display unit 93 has a function of displaying various data such as an operation state of the user on the operation unit 97 and a captured image. Note that the imaging apparatus 1 may not be provided with the display unit 93, and may be configured such that captured image data is transmitted to another display apparatus and an image is displayed.

The R/W94 writes the image data encoded by the image processing unit 92 into the memory 100, and reads the image data recorded in the memory 100.

The CPU95 functions as a control processing unit that controls each circuit block provided in the imaging apparatus 1, and controls each circuit block based on an instruction input signal or the like from the operation unit 97.

The lens driving control unit 96 controls a lens driving unit that moves the lens based on a control signal from the CPU95.

The operation unit 97 outputs an instruction input signal corresponding to an operation by the user to the CPU95.

The memory 100 is, for example, a semiconductor memory attachable to and detachable from a slot connected to the R/W94, or a semiconductor memory incorporated in advance in the imaging apparatus 1.

Hereinafter, the operation in the image forming apparatus 1 will be described.

In the shooting standby state, a shooting image signal is output to the display unit 93 via the camera signal processing unit 91 and displayed as a camera through image under the control of the CPU95. Further, when an instruction input signal is input from the operation unit 97, the CPU95 outputs a control signal to the lens driving control unit 96, and moves the lens under the control of the lens driving control unit 96.

When a photographing operation is performed according to an instruction input signal from the operation unit 97, a photographed image signal is output from the camera signal processing unit 91 to the image processing unit 92, subjected to compression encoding processing, and converted into digital data of a predetermined data format. The converted data is output to the R/W94 and written to the memory 100.

In the case of reproducing image data recorded in the memory 100, predetermined image data is read from the memory 100 through the R/W94 in accordance with an operation to the operation unit 97, and after the image processing unit 92 performs decompression decoding processing, a reproduced image signal is output to the display unit 93, and a reproduced image is displayed.

Note that in the present technology, "imaging" refers to a process including only a part or all of a series of processes from a photoelectric conversion process of converting light captured by the imaging element 12 into an electric signal to a process of converting an output signal from the imaging element 12 into a digital signal by the camera signal processing unit 91, noise removal, image quality correction, conversion into a luminance/chrominance signal, or the like, a compression encoding/decompression decoding process of an image signal based on a predetermined image data format by the image processing unit 92, a conversion process of a data specification such as a resolution, and a writing process of writing the image signal into the memory 100 by the R/W94.

That is, "imaging" may refer only to photoelectric conversion processing of converting light captured by the imaging element 12 into an electrical signal, or may refer to processing from photoelectric conversion processing of converting light captured by the imaging element 12 into an electrical signal to processing such as conversion into a digital signal, noise removal, image quality correction, and conversion into a luminance/chrominance signal by the camera signal processing unit 91 with respect to an output signal from the imaging element 12, and then to compression encoding/decompression decoding processing of an image signal based on a predetermined image data format and conversion processing of a data specification such as resolution by the image processing unit 92. This processing may refer to processing from photoelectric conversion processing of converting light captured by the imaging element 12 into an electric signal to processing such as conversion into a digital signal by the camera signal processing unit 91, noise removal, image quality correction, and conversion into a luminance/chrominance signal, compression encoding/expansion decoding processing of an image signal based on a predetermined image data format by the image processing unit 92, and conversion processing of a data specification such as resolution, and may refer to processing up to writing of the image signal into the memory 100 by the R/W94. In the above-described processing, the order of each processing may be appropriately changed.

Further, in the present technology, the camera block 90 and the imaging apparatus 1 may include only a part or all of the imaging element 12, the camera signal processing unit 91, the image processing unit 92, and the R/W94 that perform the above-described processing.

Further, the camera block 90 may include a part of the imaging element 12, the camera signal processing unit 91, the image processing unit 92, and the R/W94.

< present technology >

The present technology can also be configured as follows.

(1) A vane opening and closing apparatus comprising:

a drive lever rotatable in a first rotational direction from a first rotational position to a second rotational position and a second rotational direction from the second rotational position to the first rotational position;

a driving body that applies a driving force as a rotational force in a first rotational direction to the driving lever;

a biasing spring that applies a driving force to the drive lever as a rotational force in a second rotational direction by biasing the drive lever; and

an opening and closing blade that is operated in a closing direction to close the opening in accordance with a rotational operation of the drive lever in the first rotational direction and is operated in an opening direction to open the opening in accordance with an operation of the drive lever in the second rotational direction,

wherein a driving force in the first rotational direction is applied from the driving body in a state where the driving force from the biasing spring is not applied to the driving lever, an

In a state where the driving force from the driving body is not applied to the driving lever, a driving force in the second rotational direction is applied from the biasing spring.

(2) The blade opening and closing apparatus according to the above (1), further comprising

A blade return spring biasing the opening and closing blade in an opening direction and biasing the drive lever in a second rotational direction.

(3) The blade opening and closing apparatus according to the above (1) or (2), wherein

The driving body is provided with a rotor,

the drive rod can be rotated independently of the rotational operation of the rotor,

the drive rod rotates integrally with the rotor in a first rotational direction by a driving force of the drive body, an

The drive lever rotates in the second rotational direction independently of the rotor by the driving force of the biasing spring.

(4) The blade opening and closing apparatus according to the above (3), wherein

The rotor and a part of the drive rod are positioned opposite to each other in the rotational axis direction of the rotor, and

a biasing spring is disposed between the opposing rotors and a portion of the drive rod.

(5) The blade opening and closing apparatus according to the above (3) or (4), wherein

The drive rod is rotatable in a first rotational direction independently of the rotor when the drive body is not energized.

(6) The blade opening and closing apparatus according to any one of the above (3) to (5), wherein

The center of gravity of the rotor is located on the axis of rotation.

(7) The blade opening and closing apparatus according to any one of the above (3) to (6), wherein

The rotational axis of the rotor and the rotational axis of the drive rod are identical.

(8) The blade opening and closing apparatus according to any one of the above (3) to (7), wherein

The rotor is provided with a pressing part,

the drive lever is provided with a pressed portion that is pressed by the pressing portion, an

When the pressed portion is pressed by the pressing portion, the drive lever is rotated in the first rotational direction by the driving force of the drive body.

(9) The blade opening and closing apparatus according to any one of the above (1) to (8), further comprising

A brake lever operable between a deceleration start position and a rotation stop position,

wherein when the brake lever is operated from the deceleration start position toward the rotation stop position, the rotational speed of the drive lever decreases when rotating in the first rotational direction.

(10) The blade opening and closing apparatus as recited in the above (9), further comprising

A lever support portion formed on the brake lever,

wherein the driving lever rotated in the first rotation direction is supported by the lever support portion.

(11) The blade opening and closing apparatus as recited in the above (10), further comprising

A brake stopper that presses the brake lever and stops the brake lever at the rotation stop position,

wherein the brake lever is stopped at the rotation stop position by the brake stopper, and the drive lever is held at the second rotation position.

(12) The blade opening and closing apparatus according to the above (2), wherein

A support base is provided, a drive lever is rotatably supported on the support base,

the driving lever is provided with a connecting shaft to which the opening and closing blade is connected,

a position holding portion that holds the drive lever at the first rotational position is formed in the support base, and

the drive lever is held at the first rotational position by pressing the connecting shaft against the position holding portion with the biasing force of the blade return spring.

(13) An image forming apparatus comprising:

a blade opening and closing device that controls light taken in through the optical system; and an imaging element for photoelectrically converting light taken in through the optical system,

wherein the vane opening and closing apparatus includes:

a drive lever rotatable in a first rotational direction from a first rotational position to a second rotational position and a second rotational direction from the second rotational position to the first rotational position;

a driving body applying a driving force as a rotational force in a first rotational direction to the driving lever;

a biasing spring that applies a driving force to the drive lever as a rotational force in a second rotational direction by biasing the drive lever; and

an opening and closing blade that is operated in a closing direction to close the opening in accordance with a rotational operation of the drive lever in the first rotational direction and is operated in an opening direction to open the opening in accordance with an operation of the drive lever in the second rotational direction,

applying a driving force in the first rotational direction from the driving body in a state where the driving force from the biasing spring is not applied to the driving lever, an

In a state where the driving force from the driving body is not applied to the driving lever, a driving force in the second rotational direction is applied from the biasing spring.

(14) The image forming apparatus as recited in the above (13), wherein

The blade opening and closing apparatus includes a driving block including a driving body and a mechanism block including an opening and closing blade,

in the moving direction of the opening and closing blade, the size of the driving block is smaller than that of the mechanism block,

the driving block is located on the outer peripheral side of the mechanism block, and

terminal portions are disposed on the outer peripheral side of the mechanism block on opposite sides of the driving block in the moving direction of the opening and closing blade.

List of reference numerals

1 image forming apparatus

11-blade opening and closing apparatus

12 imaging element

13A opening

15 opening and closing blade

20 support base

21 position holding part

22 blade return spring

25 brake stop

27 drive body

28 drive rod

29 biasing spring

32 rotor

38 pressing part

39 acting part

41c pressed part

42 connecting shaft

43 brake lever

44a rod support

45a operated part

50 driving block

60 mechanism block

70 terminal part

Claims (14)

1. A vane opening and closing apparatus comprising:

a drive lever rotatable in a first rotational direction from a first rotational position to a second rotational position and a second rotational direction from the second rotational position to the first rotational position;

a driving body that applies a driving force as a rotational force in a first rotational direction to the driving lever;

a biasing spring that applies a driving force to the drive lever as a rotational force in a second rotational direction by biasing the drive lever; and

an opening and closing blade that is operated in a closing direction to close the opening in accordance with a rotational operation of the drive lever in the first rotational direction and is operated in an opening direction to open the opening in accordance with an operation of the drive lever in the second rotational direction,

wherein a driving force in the first rotational direction is applied from the driving body in a state where the driving force from the biasing spring is not applied to the driving lever, an

In a state where the driving force from the driving body is not applied to the driving lever, a driving force in the second rotational direction is applied from the biasing spring.

2. The blade opening and closing apparatus according to claim 1, further comprising

A blade return spring biasing the opening and closing blade in an opening direction and biasing the drive lever in a second rotational direction.

3. The blade opening and closing apparatus according to claim 1, wherein

The driving body is provided with a rotor,

the drive rod can be rotated independently of the rotational operation of the rotor,

the drive lever is rotated in a first rotational direction integrally with the rotor by a driving force of the drive body, and

the drive lever rotates in the second rotational direction independently of the rotor by the driving force of the biasing spring.

4. The blade opening and closing apparatus according to claim 3, wherein

The rotor and a part of the drive rod are positioned opposite to each other in the direction of the rotational axis of the rotor, and

a biasing spring is disposed between the opposing rotors and a portion of the drive rod.

5. The blade opening and closing apparatus according to claim 3, wherein

When the drive body is not energized, the drive rod is rotatable independently of the rotor in the first rotational direction.

6. The blade opening and closing apparatus according to claim 3, wherein

The center of gravity of the rotor is located on the axis of rotation.

7. The blade opening and closing apparatus according to claim 3, wherein

The rotational axis of the rotor and the rotational axis of the drive rod are identical.

8. The blade opening and closing apparatus according to claim 3, wherein

The rotor is provided with a pressing part,

the drive lever is provided with a pressed portion that is pressed by the pressing portion, an

When the pressed portion is pressed by the pressing portion, the drive lever is rotated in the first rotational direction by the driving force of the drive body.

9. The blade opening and closing apparatus according to claim 1, further comprising

A brake lever operable between a deceleration start position and a rotation stop position,

wherein when the brake lever is operated from the deceleration start position toward the rotation stop position, the rotational speed of the drive lever decreases when rotating in the first rotational direction.

10. The vane opening and closing apparatus as claimed in claim 9, further comprising

A lever support portion formed on the brake lever,

wherein the driving lever rotated in the first rotation direction is supported by the lever support portion.

11. The blade opening and closing apparatus according to claim 10, further comprising

A brake stopper that presses the brake lever and stops the brake lever at the rotation stop position,

wherein the brake lever is stopped at the rotation stop position by the brake stopper, and the drive lever is held at the second rotation position.

12. The blade opening and closing apparatus according to claim 2, wherein

A support base is provided, a drive lever is rotatably supported on the support base,

the driving lever is provided with a connecting shaft to which the opening and closing blade is connected,

a position holding portion that holds the drive lever at the first rotational position is formed in the support base, and

the drive lever is held at the first rotational position by pressing the connecting shaft against the position holding portion with the biasing force of the blade return spring.

13. An image forming apparatus comprising:

a blade opening and closing device that controls light taken in through the optical system; and an imaging element for photoelectrically converting light taken in through the optical system,

wherein the vane opening and closing apparatus includes:

a drive lever rotatable in a first rotational direction from a first rotational position to a second rotational position and a second rotational direction from the second rotational position to the first rotational position;

a driving body applying a driving force as a rotational force in a first rotational direction to the driving lever;

a biasing spring that applies a driving force to the drive lever as a rotational force in a second rotational direction by biasing the drive lever; and

an opening and closing blade that is operated in a closing direction to close the opening in accordance with a rotational operation of the drive lever in the first rotational direction and is operated in an opening direction to open the opening in accordance with an operation of the drive lever in the second rotational direction,

a driving force in the first rotational direction is applied from the driving body in a state where the driving force from the biasing spring is not applied to the driving lever, an

In a state where the driving force from the driving body is not applied to the driving lever, a driving force in the second rotational direction is applied from the biasing spring.

14. The imaging apparatus of claim 13, wherein

The blade opening and closing apparatus includes a driving block including a driving body and a mechanism block including an opening and closing blade,

in the moving direction of the opening and closing blade, the size of the driving block is smaller than that of the mechanism block,

the driving block is located on the outer peripheral side of the mechanism block, and

terminal portions are disposed on the outer peripheral side of the mechanism block on opposite sides of the driving block in the moving direction of the opening and closing blade.

Images