TWI448815B - Diaphragm device, camera, manufacturing method of diaphragm device, electronic equipment and mobile body drive device - Google Patents

Description

Aperture device, camera, method of manufacturing aperture device, electronic device, and moving member driving device

The present invention relates to an aperture device, a camera, a method of manufacturing the aperture device, an electronic device, and a moving member driving device.

In general, an optical device for adjusting the amount of incident light is mounted in an optical device such as a camera. As an example of the configuration of the aperture device, there is a method in which the amount of light is adjusted by the movement of the diaphragm member. In the above-described Patent Document 1, for example, a diaphragm device using a stepping motor as a drive source is described. Further, for example, Patent Document 2 describes that a diaphragm device transmits a driving force of a stepping motor by a gear reduction mechanism.

As described above, in the case where a stepping motor is used as the driving source of the aperture device, the number, frequency, and order of the pulses (pulse signals for driving the motor) input to the stepping motor are respectively determined as the rotation angle of the stepping motor. , rotation speed and parameters of the direction of rotation. Therefore, in the case where the light amount adjustment is performed by the movement of the diaphragm member, it is necessary to control the driving of the stepping motor by using the number, frequency, and order of the pulses input to the stepping motor as parameters.

In general, in a control system in which a stepping motor is used for a drive source, a sensor is used to detect a situation in which a moving member that performs a moving operation when a stepping motor is driven is in a predetermined operational state. Further, by setting the number and order of pulses of the input stepping motor based on the detection timing as a reference, the operation state of the moving member can be shifted from the predetermined operation state to the target operation state. However, in this case, a sensor for detecting whether or not the moving member is in a predetermined operational state is required. Therefore, the cost of preparation and assembly of the sensor increases the manufacturing cost of the aperture device.

Therefore, in the case of not using the above-described sensor control method, there is also proposed a method for determining that the moving member is in a predetermined operation state (hereinafter referred to as "abutment mode") by the abutment of the members (for example, refer to the patent document). 3, 4). If the control method is described by the above-described example of the moving member, it is as follows.

That is, a stopper is provided in advance at one end of the moving range of the moving member, and the state in which the moving member (or the member moving together with the moving member) abuts against the stopper is regarded as the "predetermined operating state". . Then, the number and order of the pulses of the input pulse motor are set based on the "predetermined operating state" as a reference, whereby the moving member is moved toward the target position.

[Patent Document 1] Japanese Patent No. 4068084

[Patent Document 2] Japanese Patent Laid-Open No. Hei 8-328080

[Patent Document 3] Japanese Patent Laid-Open No. 4-69625

[Patent Document 4] Japanese Patent Laid-Open Publication No. 2002-107791

However, there are the following disadvantages when using the abutment method.

In general, the drive of the stepping motor is performed by a cycle of the excitation modes formed by a plurality of steps. For example, when a two-phase stepping motor composed of an A-A' phase and a B-B' phase is used as a driving target, the input terminal A corresponding to the A-A' phase is sequentially switched by the input of the pulse, respectively. The stepping motor is driven by the potential state of the input terminal A' and the potential state of the input terminal B and the input terminal B' corresponding to the phase BB'.

For example, in the first step, a pulse is input which causes the input terminal A to be in the Hi state, the input terminal A' to be in the Low state, the input terminal B to be in the Low state, and the input terminal B' to be in the Hi state, with the corresponding pulse The input excitation mode energizes the stepper motor.

Further, in the second step, a pulse is formed in which the input terminal A is in the Hi state, the input terminal A' is in the Low state, the input terminal B is in the Hi state, and the input terminal B' is in the Low state. The excitation mode corresponding to the input of the pulse energizes the stepper motor.

Further, in the third step, a pulse for forming an excitation mode in which the input terminal A is in the Low state, the input terminal A' is in the Hi state, the input terminal B is in the Hi state, and the input terminal B' is in the Low state is input. The excitation mode corresponding to the input of the pulse energizes the stepper motor.

Further, in the fourth step, a pulse for forming an excitation mode in which the input terminal A is in the Low state, the input terminal A' is in the Hi state, the input terminal B is in the Low state, and the input terminal B' is in the Hi state is input. The excitation mode corresponding to the input of the pulse energizes the stepper motor.

In this case, when a pulse is input to the stepping motor in a state where the moving member abuts against the stopper, a maximum of three steps is generated between the number of pulses input and the effective rotation angle of the stepping motor. Offset. Hereinafter, specific examples will be described.

In addition, the effective rotation angle of the stepping motor refers to the angle at which the stepping motor actually rotates due to the input of the pulse.

First, the premise of the description is described.

There are two modes of inputting the pulse of the stepping motor in the order of "step up" and "step down".

In the case of inputting pulses in ascending order, for example, when the first pulse is used as the first pulse, follow the first step → the second step → the third step → the fourth step → the first step → (the same is performed later) The order of the cycles is input pulses.

The case where the pulse is input in descending order is, for example, the following case: when the fourth step is the first pulse, follow the fourth step → the third step → the second step → the first step → the fourth step → (the same is performed later) The order of the cycles is input pulses.

Wherein, when the pulse is input in the ascending order, the stepping motor rotates forward, and when the pulse is input in descending order, the stepping motor is reversed. Further, in the case where the stepping motor rotates forward, the moving member moves in a direction away from the stopper, and in the case where the stepping motor is reversed, the moving member moves in a direction approaching the stopper.

Further, as for other preconditions, when a pulse is input to the stepping motor from a state in which the moving member abuts against the stopper, the second step → third step → fourth step → first is performed according to the order of the above excitation modes. Enter the pulse in the order of step → (the same cycle later).

In this case, the rotation operation of the stepping motor accompanying the input of the pulse differs depending on the angular position of the stepping motor in the rotation direction (when the moving member abuts against the stopper).

The following is divided into four examples to illustrate.

(1) First case

When the stepping motor stops at the angle corresponding to the excitation mode of the first step in a state where the moving member abuts against the stopper, the stepping motor rotates by one step when the pulse of the second step is started. Amplitude.

Secondly, when the pulse is input in the order of the third step → the fourth step → the first step, the stepping motor is rotated step by step according to this.

As a result, a total of 4 pulses are input to the stepping motor in the order of the moving member against the stopper in the order of the second step → the third step → the fourth step → the first step → the stepping motor totals Rotate 4 steps in amplitude.

(2) The second case

When the stepping motor stops at the angle corresponding to the excitation mode of the second step in the state in which the moving member abuts against the stopper, even if the pulse of the second step is started, the stepping motor is originally The angle of the excitation mode corresponding to the second step is stopped, so that the stepping motor stops without rotating.

Secondly, when the pulse is input in the order of the third step → the fourth step → the first step, the stepping motor is rotated step by step according to this.

As a result, a total of 4 pulses are input to the stepping motor in the order of the moving member against the stopper in the order of the second step → the third step → the fourth step → the first step → the stepping motor totals Rotate 3 steps in amplitude.

(3) The third case

When the stepping motor is stopped at the angle corresponding to the exciting mode of the third step in the state in which the moving member abuts against the stopper, even if the pulse of the second step is started, the rotation of the stepping motor is also Blocked by a stop. Therefore, the stepping motor stops without rotating.

Secondly, even if the pulse of the third step is input, since the stepping motor originally stops at the angle corresponding to the exciting mode of the third step, the stepping motor stops without rotating.

Secondly, when the pulse is input in the order of the fourth step → the first step, the stepping motor is rotated step by step according to this.

As a result, the stepping motor is input to the stepping motor in a total of 4 pulses in the order of the second step → the third step → the fourth step → the first step → in the state in which the moving member abuts against the stopper. A total of 2 steps of rotation.

(4) Fourth case

When the stepping motor stops at the angle corresponding to the excitation mode of the fourth step in the state in which the moving member abuts against the stopper, when the pulse of the second step is started, according to the rotor of the stepping motor The stepping motor will perform one of the three action modes described below, depending on the relative positional relationship with the stator.

(4a) First action mode

When the pulse of the second step is initially input, the stepping motor rotates by 2 steps in amplitude beyond the angular position of the excitation mode corresponding to the first step.

Secondly, when the pulse is input in the order of the third step → the fourth step → the first step, the stepping motor is rotated step by step according to this.

As a result, a total of 4 pulses are input to the stepping motor in the order of the moving member against the stopper in the order of the second step → the third step → the fourth step → the first step → the stepping motor totals Rotate 5 steps in amplitude.

(4b) second action mode

When the pulse of the second step is initially input, the stepping motor intends to return the angular position corresponding to the excitation mode of the second step beyond the angular position of the excitation mode corresponding to the third step. However, the rotation of the stepper motor is blocked by the stopper. Therefore, the stepping motor stops without rotating.

Second, when the pulse of the third step is input, the stepping motor wants to return to the angular position corresponding to the excitation mode of the third step. However, the rotation of the stepper motor is blocked by the stopper. Therefore, the stepping motor stops without rotating.

Secondly, even if the pulse of the fourth step is input, since the stepping motor is originally stopped at the angle corresponding to the exciting mode of the fourth step, the stepping motor stops without rotating.

Second, when the pulse of the first step is input, the stepping motor rotates by one step.

As a result, a total of 4 pulses are input to the stepping motor in the order of the moving member against the stopper in the order of the second step → the third step → the fourth step → the first step → the stepping motor totals Rotate 1 step amplitude.

(4c) third action mode

When the pulse of the second step is initially input, the magnetic force (magnetic attraction force) acting on the rotor of the stepping motor is in a state of being balanced between one of the rotating directions and the other. Therefore, the motor stops without rotating.

Secondly, when the pulse of the third step is input, the stepping motor is intended to return the angular position of the excitation mode corresponding to the third step. However, the rotation of the stepper motor is blocked by the stopper. Therefore, the stepping motor stops without rotating.

Secondly, even if the pulse of the fourth step is input, since the stepping motor is originally stopped at the angle corresponding to the exciting mode of the fourth step, the stepping motor stops without rotating.

Second, when the pulse of the first step is input, the stepping motor rotates by one step.

As a result, in the state in which the moving member abuts against the stopper, a total of 4 pulses are input to the stepping motor in the order of the second step → the third step → the fourth step → the first step → the stepping motor A total of 1 step is rotated.

It can be seen from the above that in the case where a pulse is input to the stepping motor in a state where the moving member abuts against the stopper, the maximum number of pulses is between the number of pulses input and the effective rotation angle of the stepping motor. The offset of the amplitude.

Such a shift in the rotation angle of the stepping motor causes the following phenomenon, for example, when the moving member is moved by the stepping motor as a driving source.

That is, when a predetermined number of pulses are input to the stepping motor from the state in which the moving member abuts against the stopper, the position at which the moving member is finally stopped due to the driving of the stepping motor based on the pulse input is generated to be equivalent to the above 3 The offset of the step amplitude.

Therefore, as described above, in the case where the stepping motor is used in the drive source of the diaphragm device, the stop position (deviation) at the stop position when the diaphragm member moves is also generated.

A main object of the present invention is to provide a structure capable of preventing positional displacement of an aperture member when diaphragm is adjusted when the stepping motor is driven in an abutting manner.

A first aspect of the present invention relates to an aperture device including: an aperture member having an opening through which light passes; and an operation member moving the aperture member in a direction in which an opening diameter of the opening is changed; a limiting unit that limits at least one end of the moving range of the diaphragm member by the operating member in abutting manner; a stepping motor as a driving source; and a driving force transmitting mechanism that transmits the driving force of the stepping motor to the action And the stepping motor and the driving force transmission mechanism are configured such that when one end of the movement range of the diaphragm member is restricted by the restriction unit, a stop angle of a rotation direction of the stepping motor becomes a predetermined predetermined angle.

A second aspect of the present invention relates to a camera comprising: the aperture device of the first aspect; and a photoelectric conversion element that converts light incident through the opening formed by the diaphragm member into an electrical signal .

A third aspect of the present invention relates to a method of manufacturing an aperture device, comprising: a diaphragm member having an opening for allowing light to pass therethrough; and an operating member for causing the aperture member to open the opening a direction in which the aperture is changed; a limiting unit that limits at least one end of the range of movement of the aperture member to the action member by the abutting manner; a stepping motor as a driving source; and a driving force transmitting mechanism that applies the stepping motor The driving force is transmitted to the operating member; and when the diaphragm device is manufactured, one end of the moving range of the diaphragm member is restricted by the restricting means, and a stopping angle of the rotating direction of the stepping motor is set to a predetermined predetermined angle. In the state of the above, the stepping motor and the above-described driving force transmission mechanism are assembled.

According to the present invention, when the stepping motor is driven in the abutting manner, the positional shift of the diaphragm member at the time of diaphragm adjustment can be prevented.

(Best form of implementing the invention)

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

In the embodiment of the present invention, the description will be made in the following order.

Camera structure

2. Structure of the aperture device

2-1. Mechanical structure of the aperture device

2-1A. Outline structure of the aperture function unit

2-1B. Outline structure of the diaphragm drive unit

2-1a. Detailed structure of the aperture function

2-1b. Detailed structure of the diaphragm drive unit

2-2. Structure of the control system of the aperture device

3. Method of manufacturing aperture device

3-1. Assembly procedure of the diaphragm drive unit

3-2. Assembly procedure of the aperture function unit

4. Action of the aperture device

4-1. Basic principle of action

4-2. Shrinking the aperture

4-3. Opening aperture movement

4-4. Adjusting the aperture movement

5. Driving method of aperture device

6. Effects of the present embodiment

7. Variants

<1. Structure of the camera>

Fig. 1 is a view showing a configuration example of a camera to which the present invention is applied, (A) is an external view of the entire camera, and (B) is a schematic view of the inside of the lens barrel. The camera 100 shown in the figure is, for example, a surveillance camera installed on a ceiling portion (or a wall or the like) of a building for the purpose of preventing crime. The camera 100 includes a mounting base 101 and a camera body 102. The mounting base 101 is, for example, a structure that is fixed to a ceiling portion of a building by screwing. The camera body 102 includes a barrel portion 103 and an objective lens 104. The objective lens 104 is attached to the front end of the barrel portion 103. An optical system including the objective lens 104 described above is mounted inside the barrel portion 103. Further, a diaphragm device 1 and an imaging element 105, which will be described later, are provided as one functional portion of the optical system. The imaging element 105 is composed of, for example, a CCD (Charge Coupled Device) imaging element, a CMOS (Complementary Metal Oxide Semiconductor) imaging element, or the like. The imaging element 105 is incorporated as an example of a photoelectric conversion element that converts light incident through an opening formed by a diaphragm member (described later) of a diaphragm device to be described later into an electric signal. Further, the present invention is not limited to the camera 100 exemplified herein, and can be applied to a camera having another configuration of the diaphragm device 1. Further, in the configuration of the optical system, various types of lenses, the number of sheets, the arrangement, the arrangement of the diaphragm device 1, and the like can be variously changed.

<2. Structure of the aperture device>

[2-1. Mechanical structure of the aperture device]

2 is a perspective view showing an example of a mechanical configuration of an aperture device according to an embodiment of the present invention. The aperture device 1 shown in the drawing is roughly divided into an aperture function unit 2 and a diaphragm drive unit 3.

[2-1A. Outline structure of aperture function unit]

The diaphragm function unit 2 is configured to include a blade substrate 4 formed as a susceptor for mounting a mechanical member constituting the diaphragm device 1 , two aperture blades 5 and 6 as an example of a diaphragm member, and a blade cover 7 The aperture blades 5, 6 are shielded from the outside to protect the aperture blades 5, 6.

[2-1B. Outline Configuration of Aperture Driving Unit 3]

The diaphragm driving portion 3 is a structure including a stepping motor 8 as a driving source, a cover member 9 for mounting the stepping motor 8, and a fork member 10 for fastening the members; In the illustrated example, four intermediate gears (driven gears) 11 to 14 for transmitting a driving force, an operating member 15 for moving the diaphragm blades 5, 6 and a bracket member 16 for mounting various members. On the blade substrate 4.

[2-1a. Detailed structure of the aperture function unit]

The detailed configuration of the diaphragm function unit 2 will be described below.

(a1. Blade substrate)

Fig. 3 is a perspective view showing the configuration of a blade substrate. The blade substrate 4 is made of, for example, a resin. The blade substrate 4 is formed in a substantially rectangular shape in plan view. The blade substrate 4 integrally has a first substrate portion 17 for housing the diaphragm driving portion 3 and a second substrate portion 18 for mounting the diaphragm blades 5, 6.

Two small holes 19 and three peripheral walls 20 are provided in the first substrate portion 17. The small hole 19 is a hole for positioning for determining the mounting position of the bracket member 16 in the rotational direction. Each of the small holes 19 is formed in a circular shape in a plan view in a state of penetrating the blade substrate 4 in the thickness direction. The three peripheral walls 20 guide the mounting position of the bracket member 16 in the direction along the main surface of the blade substrate 4. Each peripheral wall 20 is formed along the same circumference. Further, each of the peripheral walls 20 is integrally formed on the blade substrate 4 in a state of being perpendicular to the main surface of the blade substrate 4 (the thickness direction of the blade substrate 4).

The second substrate portion 18 is provided with an opening portion 21 and a plurality of protrusion portions 22. The opening portion 21 is formed in a shape of a keyhole in a plan view that is long in the longitudinal direction of the blade substrate 4. The opening 21 is disposed so as to overlap the opening formed by the two (a pair of) diaphragm blades 5 and 6.

As shown in FIG. 4, a plurality of protrusions 4A are formed on the lower surface side of the blade substrate 4 (the side opposite to the squint direction of FIG. 3). The plurality of protrusions 4A are for guiding the movement of the diaphragm blades 5, 6. The ends of the respective protrusions 4A are bent in an L shape. Further, a stopper portion 4B as an example of a restriction means is provided on the lower surface side of the blade substrate 4. The stopper portion 4B is disposed such that a wall surface is formed at a terminal end portion of a movement range of the hook portion 43B of the operation member 15 to be described later. Further, the arm portions 23 are provided on the two long side portions of the blade substrate 4. Each of the arm portions 23 exists at a boundary portion between the first substrate portion 17 and the second substrate portion 18 in the longitudinal direction of the blade substrate 4. Further, each of the arm portions 23 is provided in a state of protruding from the long side portion of the corresponding blade substrate 4 in the width direction (short side direction) of the blade substrate 4.

(a2. Aperture blades on one side)

The aperture blade 5 is configured by, for example, a member obtained by coating a surface of a plate-shaped material formed of polyethylene terephthalate (hereinafter referred to as "PET") with a carbon film. The diaphragm blades 5 are formed in a thin plate shape as a whole. The aperture blade 5 is provided with one hole portion 24, three guide grooves 25, and one engagement hole 26. The hole portion 24 is formed in a planar shape in which a part of the perfect circle is enlarged in a substantially V shape. The three guide grooves 25 are formed in parallel with each other along the longitudinal direction of the diaphragm blades 5. One end portion of each of the guide grooves 25 in the longitudinal direction is formed to have a larger groove diameter than the other portions. Two of the three guide grooves 25 are formed on the same straight line. Further, the remaining one guide groove 25 is disposed on the opposite side of the two guide grooves 25 with the hole portion 24 interposed therebetween. The engagement holes 26 are disposed on the extension lines of the above two guide grooves 25. The engagement hole 26 is formed in a long hole shape in plan view at a direction substantially perpendicular to the guide groove 25. One end portion of the engaging hole 26 in the longitudinal direction is formed to have a larger groove diameter than the other portions.

(a3. The aperture blade on the other side)

Similarly to the diaphragm blade 5, the diaphragm blade 6 is formed by, for example, covering a surface of a plate-shaped material made of PET with a carbon film, and is formed in a thin plate shape as a whole. The diaphragm blade 6 is provided with a bent portion 27, three guide grooves 28, and one engagement hole 29. The curved portion 27 is formed in a state of being recessed in a concave shape in the longitudinal direction of the diaphragm blade 6. The curved portion 27 is formed in a planar shape in which a part of a semicircle (or an ellipse) is enlarged in a substantially V shape. The three guide grooves 28 are formed in parallel with each other along the longitudinal direction of the diaphragm blades 6. One end portion of each of the guide grooves 28 in the longitudinal direction is formed to have a larger groove diameter than the other portions. Two of the three guide grooves 28 are formed on the same straight line. Further, the remaining one guide groove 28 is disposed on the opposite side of the two guide grooves 28 via the curved portion 27. The engagement holes 29 are disposed on the extension lines of the above two guide grooves 28. The engagement hole 29 is formed in a long hole shape in plan view at a direction substantially perpendicular to the guide groove 28. One end portion of the engagement hole 29 in the longitudinal direction is formed to have a larger groove diameter than the other portions.

The relative positional relationship between the aperture blade 5 and the aperture blade 6 is as follows.

The two aperture blades 5, 6 or more are placed in a positional relationship. Specifically, in the positional relationship in which the diaphragm blades 5 are positioned on the upper side and the diaphragm blades 6 are located on the lower side, the two aperture blades 5 and 6 are stacked one on another. Further, it is defined that the diameter of the perfect circular portion of the hole portion 24 of the diaphragm blade 5 and the diameter of the semicircular portion of the curved portion 27 of the predetermined diaphragm blade 6 are substantially the same size. Further, the portion where the engaging hole 26 is formed in the short-side direction of the diaphragm blade 5 and the portion where the engaging hole 29 is located in the short-side direction of the diaphragm blade 6 are formed in opposite directions. Therefore, in a state in which the two aperture blades 5, 6 are stacked one on another, the engagement hole 26 and the engagement hole 29 are arranged in a position shifted from each other. In this state, an opening portion (an opening through which light is supplied) is formed in a portion where the hole portion 24 of the diaphragm blade 5 and the curved portion 27 of the diaphragm blade 6 overlap. However, depending on the position of the diaphragm blades 5, 6, the opening may be completely closed.

(a4. Blade cover)

The blade cover 7 is formed using, for example, a metal such as aluminum. The blade cover 7 is formed in a substantially rectangular shape in plan view in the same size as the blade substrate 4 described above. The blade cover 7 is provided with one opening portion 30 and two clearance groove portions 31A and 31B. The opening portion 30 is formed in a substantially oval shape in a plan view. The opening 30 is disposed so as to overlap the opening formed by the two aperture blades 5 and 6. The clearance groove portions 31A, 31B are opposed to each other on one side and the other side in the short-side direction of the blade cover 7. Each of the clearance groove portions 31 is formed in a substantially arc shape in plan view so as to penetrate the blade cover 7 in the thickness direction.

[2-1b. Detailed structure of the diaphragm drive unit]

The detailed structure of the diaphragm driving unit 3 will be described below.

(b1. drive source)

As the driving source of the aperture device 1, a stepping motor 8 is provided. In the present embodiment, a two-phase stepping motor is used as an example of a driving source. However, the present invention is not limited thereto, and other stepping motors may be used. As for the characteristics of the stepping motor 8, for example, the rotation angle (step angle) of the one-step amplitude in the rotational direction is 18°. In this case, when the stepping motor 8 is operated by 20 steps by the input of the pulse, the stepping motor 8 is rotated by one rotation (360° rotation). A drive gear (not shown) is coaxially mounted to the rotating shaft (output shaft) of the stepping motor 8. The drive gear rotates integrally with the rotation shaft of the stepping motor 8.

A claw portion 32 is provided at a main portion of the stepping motor 8. The claw portion 32 is provided with one of the one side and the other side on the imaginary straight line passing through the center of the main body portion, with the main body portion of the stepping motor 8 interposed therebetween. A wiring portion 33 is drawn from the main body portion of the stepping motor 8. The connector portion 34 is provided at the end portion of the wiring portion 33. The wiring portion 33 and the connector portion 34 are members for inputting a pulse for driving the stepping motor 8.

(b2. Cover member)

The cover member 9 is formed using, for example, a resin. The cover member 9 is formed in a substantially circular shape in plan view. The cover member 9 is a member for attaching the stepping motor 8 to the blade substrate 4 by the bracket member 16. The cover member 9 is provided with a pair of first hook portions 35, a pair (only one of which is shown in the drawing example), a second hook portion 36, a guide wall 37, a hole portion 38, and two clamping portions. 39.

The first hook portion 35 is a portion for fixing the stepping motor 8 to the cover member 9. The first hook portions 35 are opposed to each other with the hole portion 38 interposed therebetween. The second hook portion 36 is disposed at a position in the circumferential direction of the cover member 9 and is phase-shifted from the first hook portion 35. Further, the second hook portion 36 is formed at a position facing each other with the hole portion 38 interposed therebetween.

The guide walls 37 are disposed at two locations in the circumferential direction of the cover member 9 and separately. The hole portion 38 is formed in a circular shape in plan view. The hole portion 38 allows insertion of a drive gear mounted to the rotating shaft of the above-described stepping motor 8, and allows engagement between the drive gear and the intermediate gear 11 in the inserted state. The nip portion 39 is for fastening the wiring portion 33 of the stepping motor 8 or another wiring portion (not shown).

(b3. Fork member)

The fork member 10 is formed using, for example, a metal such as SUS. The intermediate gear 11 is formed in a substantially circular shape in plan view. The fork member 10 is provided with a hole portion 41, two leg portions 40, and two clearance portions 42. The leg portion 40 is for mounting the fork member 10 itself to the blade substrate 4. Each of the leg portions 40 is formed on the circumference of the main body portion (disk portion) of the fork member 10 in a state of extending from the opposite positions 2 in the thickness direction of the fork member 10, respectively. The hole portion 41 is formed in a state of penetrating the body portion of the fork member 10. Both the hole portion 41 and the hole portion 38 of the above-described cover member 9 allow the engagement between the drive gear and the intermediate gear 11. The clearance portion 42 is formed at a position on the circumference of the main body portion of the fork member 10 at a position offset from the leg portion 40. The clearance portion 42 serves to avoid positional interference with the second hook portion 36 of the cover member 9 when the cover member 9 is attached.

(b2. Gear train)

The plurality of intermediate gears 11 to 14 constitute a gear train together with the above-described drive gears. This gear train is provided as an example of a driving force transmission mechanism. Each of the intermediate gears 11 to 14 is made of, for example, a resin. Further, the intermediate gear 11 is constituted by a spur gear. Each of the intermediate gears 12 to 14 has a gear structure in which two spur gears are coaxially integrated. When the drive gear mounted on the output shaft of the stepping motor 8 is the most upstream gear, the intermediate gear 11 is the second gear from the most upstream, the intermediate gear 12 is the third gear from the most upstream, and the intermediate gear 13 is From the most upstream gear, the intermediate gear 14 is the fifth gear from the most upstream.

In terms of the meshing mode of the gear train, the drive gear meshes with the intermediate gear 11, and the intermediate gear 11 simultaneously meshes with the gear portions of the drive gear and the large-diameter side of the intermediate gear 12. The gear portion on the small diameter side of the intermediate gear 12 meshes with the gear portion on the large diameter side of the intermediate gear 13. The gear portion on the small diameter side of the intermediate gear 13 meshes with the gear portion on the large diameter side of the intermediate gear 14. The gear portion on the small diameter side of the intermediate gear 14 meshes with the internal gear portion (described later) of the operating member 15.

(b3. Action component)

Fig. 5 is a perspective view showing the configuration of an action member. The action member 15 is formed using, for example, a resin. The operating member 15 is formed in a substantially circular shape in plan view. The operating member 15 is provided with two hooking portions 43A and 43B, two clearance holes 44, an internal gear portion 45, a shaft hole portion 46, and two recessed portions 47.

The two hooking portions 43A and 43B are disposed on the circumference of the main body portion (disk portion) of the operating member 15 at positions facing the diameter direction (outer side) of the operating member 15 from the opposite positions. Each of the hooking portions 43A and 43B is formed in a substantially L shape.

Each of the two clearance holes 44 is formed in a long hole shape in an arc shape in plan view. Each of the clearance holes 44 penetrates the main body portion of the operating member 15 in the thickness direction. Further, the two clearance holes 44 are formed at positions sandwiching the shaft hole portion 46. The internal gear portion 45 is formed inside the operating member 15. The internal gear portion 45 is formed in a range of slightly less than 180° (for example, 160° up and down) in the circumferential direction around the axial hole portion 46. The shaft hole portion 46 is formed at a central portion of the main body portion of the operating member 15. The shaft hole portion 46 is formed in a state of penetrating the center of the main body portion of the operating member 15. The two recessed portions 47 are formed in a state in which the top surface of the main body portion of the operating member 15 is opened upward. One magnet 48 corresponding to the recessed portion is inserted into each of the recessed portions 47.

(b4. Bracket member)

The bracket member 16 is formed using, for example, a resin. The bracket member 16 is formed to integrally include the bottom plate portion 50 and the pair of side wall portions 49. The pair of side wall portions 49 are disposed in a state of being opposed to each other. The pair of side wall portions 49 are formed in a state of being vertically raised from the bottom plate portion 50. The bottom plate portion 50 connects the pair of side wall portions 49.

A total of two hooking holes 51, a total of four pin portions 52, and a total of two recessed portions 53 are provided in the pair of side wall portions 49. The hooking hole portion 51 is for hooking the second hook portion 36 of the cover member 9. The pin portion 52 is provided in each of the top surfaces of the pair of side wall portions 49. Each of the pin portions 52 is provided in a state of being protruded upward. The recessed portion 53 is provided in a state in which the outer peripheral surface of the outer side of the side wall portion 49 is partially recessed. A magnet 54 is attached to the recess 53.

The magnet 54 is a member that absorbs a gap (hereinafter referred to as "backlash") generated by the meshing portion between the gears of the gear train by the combination with the magnet 48 described above. That is, when the operating member 15 is rotated, a magnetic force is generated between the magnet 48 and the magnet 54, and the operating member 15 is biased in one direction or the other direction in the rotational direction by the action of the magnetic force. Thus, the meshing portions of the gears are in a state of being in one-side contact by the action of the magnetic force, that is, a state in which the backlash is absorbed. By using the two magnets 54 and the two magnets 48, respectively, it is possible to obtain such a state when the operating member 15 is rotated in the direction in which the diaphragm is contracted and when the operating member 15 is rotated in the direction in which the diaphragm is opened.

Further, in the case where the backlash is absorbed by the action of the magnetic force, the magnet and the magnetic body may be combined. However, in the case where it is desired to apply a stronger pressing force with respect to the rotational direction of the operating member 15, it is preferable to adopt a structure in which a magnet and a magnet are combined.

The bottom plate portion 50 is provided with two shaft portions 55 and 56 and a stud portion (not shown). The shaft portions 55 and 56 are provided in a state of being vertically raised from the main surface of the bottom plate portion 50. Each of the shaft portions 55, 56 is formed in a circular cross section. Further, the two shaft portions 55 and 56 include a stud portion (not shown) arranged in a direction parallel to each other. The stud portion is disposed between the two shaft portions 55 and 56 on the main surface of the bottom plate portion 50.

In the embodiment of the present invention, one of the constituent elements of the diaphragm function unit 2 includes the blade substrate 4, but the present invention is not limited thereto, and the blade substrate 4 may be included in one of the constituent elements constituting the diaphragm driving unit 3. Further, the blade substrate 4 may be an element that is independent of the diaphragm function unit 2 and the diaphragm drive unit 3.

[2-2. Structure of the gap system of the aperture device]

Next, the configuration of the control system of the diaphragm device 1 according to the embodiment of the present invention will be described.

FIG. 6 is a block diagram showing a schematic configuration of a control system of the diaphragm device 1 according to the embodiment of the present invention. In FIG. 6, the control unit 70 is configured to include a motor control circuit 71 and a motor drive circuit 72.

The motor control circuit 71 outputs a control command signal for diaphragm adjustment to the motor drive circuit 72. The control command signal for aperture adjustment is, for example, a signal generated based on a control program or the like that is previously incorporated in the motor control circuit 71.

The motor drive circuit 72 draws a control command signal output from the motor control circuit 71, and drives the stepping motor 8 based on the control command signal. When the stepping motor 8 is driven, the motor drive circuit 72 outputs a pulse for driving the motor. The stepping motor 8 rotates in accordance with the number, frequency, and sequence of pulses output from the motor drive circuit 72.

<3. Manufacturing method of aperture device>

Next, a method of manufacturing the aperture device 1 according to the embodiment of the present invention will be described.

[3-1. Assembly procedure of the diaphragm drive unit]

In this program, the constituent members of the diaphragm driving unit 3 are attached to the blade substrate 4.

The assembly procedure of the diaphragm drive unit includes the following programs.

a. Installation procedure of the bracket member 16

b. Installation procedure of the action member 15

c. Installation procedure of the intermediate gear 14

d. Installation procedure of the intermediate gear 13

e. Installation procedure for the intermediate gear 12

f. Installation procedure of the intermediate gear 11

g. Installation procedure of the fork member 10

h. Installation procedure of the cover member 9

i. Installation procedure of stepping motor 8

Each program will be described below.

(a. Installation procedure of the bracket member 16)

First, as shown in FIG. 7, the bracket member 16 is attached to the blade substrate 4. The bracket member 16 is attached to the first substrate portion 17 of the blade substrate 4 with the peripheral wall 20 as a guide portion. At this time, for example, the magnet 54 is attached to the recessed portion 53 of the bracket member 16 by a double-sided tape or adhesion (see FIG. 2). As can be seen from FIG. 7, the stud portion 67 is provided between the two shaft portions 55, 56 of the bracket member 16. The stud portion 67 is provided in a state of being vertically raised from the main surface (top surface) of the bottom plate portion 50 of the bracket member 16. The height of the stud portion 67 based on the main surface of the bottom plate portion 50 of the bracket member 16 is sufficiently lower than the shaft portions 55 and 56.

(b. Installation procedure of the action member 15)

Next, as shown in FIG. 8, the operating member 15 is attached to the bracket member 16. The action member 15 is mounted inside the bracket member 16. At this time, the stud portion 67 of the bracket member 16 is inserted into the shaft hole portion 46 of the operating member 15. Thereby, the operation member 15 is supported in a state of being freely rotatable about the stud portion 67. Further, shaft portions 55 and 56 corresponding to the respective clearance hole portions 44 are inserted into the two clearance holes 44 of the operating member 15 respectively. The hooking portions 43A and 43B (see FIG. 5 ) of the operating member 15 are formed to protrude downward beyond the bottom surface of the blade substrate 4 . Then, the magnet 48 (see FIG. 2) is attached to the recessed portion 47 of the operating member 15 at this stage. The fixing of the magnet 48 is performed, for example, by press fitting, bonding, or the like.

(c. Installation procedure of the intermediate gear 14)

Next, as shown in FIG. 9, the intermediate gear 14 is attached to the bracket member 16. The intermediate gear 14 is inserted into the shaft portion 56 of the bracket member 16 to be mounted. At this time, the gear portion on the small diameter side of the intermediate gear 14 is meshed with the internal gear portion 45 of the operating member 15 (see FIG. 5).

Here, when the internal gear portion 45 of the operating member 15 is meshed with the intermediate gear 14, for example, a jig for assembly as shown in FIG. 10 can be used. Fig. 10(A) is a plan view of the jig for assembly, and Fig. 10(B) is a perspective view of the jig.

The jig for assembly shown in the drawing is constituted by a frame 57 and a rotating body 58. The first housing portion 59 and the second housing portion 60 are formed in the housing 57. The first housing portion 59 accommodates the blade substrate 4 described above. A pair of notch portions 61 are provided in the first housing portion 59. The second housing portion 60 houses the rod portion 65 of the rotating body 58. The second housing portion 60 is formed in a fan shape in plan view. Two abutting walls 62 and 63 are formed in the second housing portion 60, and are predetermined to have a predetermined opening angle θ (for example, θ=90°) based on the rotation center of the rotating body 58.

The rotating body 58 is attached to the frame 57 so as to be rotatable around the shaft portion 64. The body portion of the rotating body 58 is formed in a disk configuration. A rod portion 65 is integrally formed on the rotating body 58. The rod portion 65 is provided in a state of protruding outward from the outer circumference of the main body portion of the rotating body 58 in the diameter direction of the main body portion. The lever portion 65 is an operation portion when the rotor 58 is rotated about the shaft portion 64. Further, a pin portion 66 is provided in the rotating body 58. The pin portion 66 is provided in a state of protruding from the main surface of the rotating body 58 in the thickness direction of the rotating body 58.

When the internal gear portion 45 of the operating member 15 is meshed with the intermediate gear 14 by using the jig for assembly configured as described above, first, the blade substrate 4 at the stage of the mounting operation of the operating member 15 is stored. The first housing portion 59 of the housing 57. At this time, each arm portion 23 of the blade substrate 4 is fitted into the corresponding notch portion 61. In this way, for example, the state as shown in FIG. 11 is obtained.

In the illustrated state, the pin portion 66 of the rotating body 58 is located in the vicinity of the hook portion 43A on one side of the operating member 15. When the lever portion 65 of the rotating body 58 is moved in the direction of the arrow by the finger or the like and the rotating body 58 is rotated, the pin portion 66 is in contact with the hooking portion 43A of the operating member 15 in the middle of the rotation. Further, when the lever portion 65 is moved in the direction of the arrow and the rotor 58 is rotated as shown in FIG. 12, finally, the hook portion 43B on the other side of the operating member 15 abuts against the stopper portion 4B. (Refer to Figure 4).

Next, while maintaining the above-described abutment state, the teeth of the intermediate gear 14 are meshed with the predetermined teeth portion of the design of the gear train in the arc direction of the internal gear portion 45 of the operating member 15. Thereafter, before the stepping motor 8 is mounted, the other members are mounted while the blade substrate 4 is mounted in the jig. In addition, the rotating body 58 may be located at any position in the rotational direction before the stepping motor 8 is mounted.

(d. Installation procedure of the intermediate gear 13)

Next, as shown in FIG. 13, the intermediate gear 13 is attached to the bracket member 16. The intermediate gear 13 is inserted into the shaft portion 55 of the bracket member 16 to be mounted. At this time, the gear portion on the small diameter side of the intermediate gear 13 is meshed with the gear portion on the large diameter side of the intermediate gear 14.

(e. Installation procedure of the intermediate gear 12)

Next, as shown in FIG. 14, the intermediate gear 12 is attached to the bracket member 16. The intermediate gear 12 is inserted into the shaft portion 56 of the bracket member 16 to be mounted. At this time, the gear portion on the small diameter side of the intermediate gear 12 is meshed with the gear portion on the large diameter side of the intermediate gear 13.

(f. Installation procedure of the intermediate gear 11)

Next, as shown in FIG. 15, the intermediate gear 11 is attached to the bracket member 16. The intermediate gear 11 is inserted into the shaft portion 55 of the bracket member 16 to be mounted. At this time, the intermediate gear 11 is meshed with the gear portion on the large diameter side of the intermediate gear 12.

(g. Installation procedure of the fork member 10)

Next, as shown in FIG. 16, the fork member 10 is attached to the blade substrate 4. The fork member 10 is attached so as to cover the intermediate gears from above the plurality of intermediate gears 11 to 14. The attachment of the fork member 10 is performed by slightly rotating the fork member 10 from the state in which the two leg portions 40 are inserted into the blade substrate 4. Thereby, the fork member 10 is fixed to the blade substrate 4 in such a manner that the respective leg portions 40 of the fork member 10 are hooked on the blade substrate 4. The fork member 10 functions to fix the bracket member 16 to the blade substrate 4 and to prevent the intermediate gears 11 to 14 from coming off.

(h. Installation procedure of the cover member 9)

Next, as shown in FIG. 17, the cover member 9 is attached to the bracket member 16. The cover member 9 is attached in such a manner as to cover the fork member 10 from above the fork member 10. The attachment of the cover member 9 is performed by hooking the second hook portion 36 (see FIG. 2) of the cover member 9 to the corresponding hook hole portion 51 of the bracket member 16. At this time, the respective pin portions 52 of the bracket member 16 are respectively inserted into the corresponding small holes of the cover member 9, thereby determining the relative positions of the two. Further, the second hook portion 36 of the cover member 9 is fitted into the clearance portion 42 of the fork member 10, whereby the rotation of the fork member 10 is performed.

(i. Installation procedure of stepping motor 8)

Next, as shown in FIG. 18, the stepping motor 8 is attached to the cover member 9. The mounting of the stepping motor 8 is performed by incorporating the motor main body portion into the inside of the cover member 9. At this time, for example, a positioning pin may be provided in advance on a side on which the output shaft of the stepping motor 8 protrudes, and the positioning pin may be inserted into a positioning hole provided in the cover member 9, thereby determining the rotation direction of the stepping motor 8. position. The fixing of the stepping motor 8 is performed by hooking the claw portion 32 of the stepping motor 8 to the first hook portion 35 of the cover member 9. Further, a drive gear (described later) is attached to the rotation shaft of the stepping motor 8, and the drive gear is meshed with the intermediate gear 11 through the hole portion 38 (see FIG. 17) of the cover member 9. Further, the wiring portion 33 (see FIG. 2) is fastened to the nip portion 39 before or after the mounting of the stepping motor 8.

Here, when the stepping motor 8 is attached to the cover member 9, as described above, the lever portion 65 of the rotating body 58 is operated to form the hook portion 43B on one side of the operating member 15 against the stopper portion. The state of 4B (refer to Figs. 4 and 12). In this abutment state, for example, as shown in FIG. 19, the step M is attached so that the mark M previously marked on the drive gear 68 of the stepping motor 8 coincides with the predetermined position of the gear train design. Here, as an example, the position of the mark M is made to be orthogonal to the main surface of the connector board 69 of the stepping motor 8 and the axis of the center of the rotating shaft of the stepping motor 8 is aligned.

In this case, the drive gear 68 is attached to the rotation shaft of the stepping motor 8 so that the position of the mark M when the stepping motor 8 is excited by the predetermined excitation mode becomes the position shown in FIG. 19 . That is, when the drive gear 68 is rotated to match the position of the mark M with the position shown in FIG. 19, the drive gear 68 is attached to the drive gear 68 such that the stop angle of the rotation direction of the stepping motor 8 is a predetermined predetermined angle. Stepper motor 8.

Therefore, when the stepping motor 8 is mounted, the stepping motor 8 is rotated by a manual operation or the stepping motor 8 is excited by a predetermined excitation mode before the mounting, so that the position of the mark M is made. In the illustrated state, the stepping motor 8 is then attached to the cover member 9. At this time, in the design of the gear train, even if the position of the mark M is slightly deviated from the predetermined position, as long as the offset amount is not equal to the amplitude of one pitch of the drive gear 68, the teeth of the drive gear 68 and the intermediate gear 11 are Do not interfere with each other and cannot engage. In the case of the illustrated example, the angle of one pitch of the drive gear 68 is 40°, so that the drive gear 68 and the intermediate gear 11 can be meshed in accordance with the design of the gear train as long as no considerable offset is generated. .

Further, in the configuration of the diaphragm device 1, depending on the method of mounting the diaphragm blades 5, 6, the relationship between the rotation direction of the stepping motor 8 and the opening and closing directions of the diaphragm blades 5, 6 may be reversed. Therefore, when the member of the diaphragm device 1 is assembled using the jig for assembly described above, the rod portion 65 of the rotating body 58 can be operated to abut the hook portion 43A on the other side of the operating member 15 corresponding to the hook. The stopper of the hanging portion 43A, that is, the position that serves as a reference for the operation.

[3-2. Assembly procedure of the aperture function unit]

In this program, the constituent members of the diaphragm function unit 2 are attached to the blade substrate 4.

The assembly procedure of the diaphragm function unit 2 includes the following programs.

a. Installation procedure of the aperture blade 5

b. Installation procedure of the aperture blade 6

c. Blade cover 7 installation procedure

The following describes each program.

(a. Installation procedure of the aperture blade 5)

First, the diaphragm blades 5 are attached to the blade substrate 4. The diaphragm blade 5 is attached to the bottom surface of the blade substrate 4 (the surface opposite to the side on which the diaphragm driving portion 3 is attached). At this time, the three guide grooves 25 provided in the diaphragm blades 5 are respectively fitted into the corresponding protrusions 4A of the blade substrate 4. The L-shaped portion of the end portion of the protruding portion 4A is inserted from the end portion of the guide groove 25 and hooked to a portion in the middle of the guide groove 25. Further, the engagement hole 26 provided in the diaphragm blade 5 is fitted into the hook portion 43B in which the operation member 15 protrudes below the blade substrate 4. Thereby, the diaphragm blade 5 is supported in a state of being moved (freely slidable) in the longitudinal direction (bidirectional direction) of the blade substrate 4.

(b. Installation procedure of the aperture blade 6)

Next, the diaphragm blades 6 are attached to the blade substrate 4. The diaphragm blades 6 are attached to the bottom surface of the blade substrate 4. Further, the diaphragm blades 6 are mounted so as to overlap the diaphragm blades 5 described above. At this time, the three guide grooves 28 provided in the diaphragm blades 6 are respectively fitted into the corresponding protrusions 4A of the blade substrate 4. The L-shaped portion of the end portion of the protruding portion 4A is inserted from the end portion of the guide groove 28 and hooked to a portion in the middle of the guide groove 28. Further, the engagement hole 29 provided in the diaphragm blade 6 is fitted into the hook portion 43A in which the operation member 15 protrudes below the blade substrate 4. Thereby, the diaphragm blade 6 is supported in a state of being moved (slidably slidable) in the longitudinal direction (two directions) of the blade substrate 4.

(c. Installation procedure of the blade cover 7)

Next, the blade cover 7 is attached to the blade substrate 4. The blade cover 7 is attached to the bottom surface of the blade substrate 4. Further, the blade cover 7 is attached so as to cover the diaphragm blades 5 and 6 from above the two aperture blades 5 and 6. At this time, the two clearance groove portions 31A and 31B provided in the blade cover 7 are respectively fitted into the two hooking portions 43A and 43B in which the operating member 15 protrudes below the blade substrate 4.

The connection state of the power transmission system from the stepping motor 8 to the diaphragm blades 5 and 6 by the above assembly procedure is as shown in Figs. 20 to 23 . Further, regarding the connected state of the power transmission system, FIG. 20 shows a plan view, FIG. 21 shows a side view, FIG. 22 shows a perspective view from above, and FIG. 23 shows a perspective view from below.

<4. Action of the aperture device>

Next, the operation of the diaphragm device 1 according to the embodiment of the present invention will be described.

[4-1. Basic Principles of Action]

First, the basic operation principle of the aperture device 1 will be described.

When the drive gear 68 is rotated by inputting a pulse to the stepping motor 8, the respective intermediate gears 11 to 14 are rotated by the driving force of the drive gear 68. Further, when the intermediate gear 14 of the final stage rotates, the operating member 15 is rotated by the rotational force of the intermediate gear 14. At this time, the direction in which the drive gear 68 rotates and the direction in which the intermediate gear 11 meshed with the drive gear 68 rotate are opposite to each other. Further, the intermediate gears 12 and 14 are respectively rotated in the same direction as the rotational direction of the drive gear 68, and the intermediate gear 13 is rotated in the same direction as the rotational direction of the intermediate gear 11. The operating member 15 rotates in the same direction as the rotational direction of the intermediate gear 14.

When the operating member 15 is rotated by the transmission of such power, the two aperture blades 5, 6 move in opposite directions to each other in conjunction with the rotation of the operating member 15. Further, the two aperture blades 5 and 6 are guided by the corresponding guide grooves 25 and 28, respectively, and are linearly reciprocated in the longitudinal direction of the aperture blade 4. At this time, the opening diameter of the opening formed by the two aperture blades 5 and 6 (hereinafter referred to as "aperture aperture") becomes smaller or larger depending on the direction in which the two aperture blades 5 and 6 move.

For example, FIG. 20 shows a state in which the aperture diameter is the largest. However, when the operation member 15 is rotated in the counterclockwise direction from the state, the aperture blades 5 and 6 are moved in the direction indicated by the solid arrow. The aperture diameter gradually (continuously) becomes smaller.

Further, although not illustrated, when the diaphragm member 5 and 6 are moved clockwise from the state in which the diaphragm aperture is the smallest (the amount of incident light is zero), the diaphragm aperture gradually increases.

Further, when the diaphragm blades 5 and 6 are moved by the rotation of the operating member 15 from a state in which the diaphragm aperture is larger than the minimum aperture and smaller than the maximum aperture, the aperture diameter becomes smaller or larger depending on the moving direction.

[4-2. Movement of shrinking aperture]

The action of contracting the aperture means an action of reducing the aperture of the aperture. Specifically, in FIG. 20 described above, the operation of moving the two aperture blades 5 and 6 in the direction indicated by the broken arrow is the operation of contracting the aperture.

[4-3. Action of opening aperture]

The action of opening the aperture means an action of enlarging the aperture of the aperture. Specifically, in the above-described FIG. 20, the operation of moving the two aperture blades 5 and 6 in the direction indicated by the solid arrow is the operation of opening the aperture.

[4-4. Adjusting the aperture movement]

The operation of adjusting the aperture means adjusting the aperture of the aperture so that the aperture of the aperture matches the aperture of the aperture (hereinafter referred to as "designated aperture") specified by the control command signal. In other words, when the aperture of the aperture before the reception of the control command signal is larger than the designated aperture, the operation of reducing the aperture of the aperture to conform to the designated aperture is an operation of adjusting the aperture. Further, when the aperture of the aperture before the reception of the control command signal is larger than the designated aperture, the operation of increasing the aperture of the aperture and conforming to the designated aperture becomes an operation of adjusting the aperture.

<Drive method of aperture device>

Next, a method of driving the diaphragm device 1 according to the embodiment of the present invention will be described.

(Description of premise)

First, the premise of the description is described.

In the embodiment of the present invention, as described above, the stepping motor 8 is constructed by using a 2-phase motor, and is driven by the four steps (excitation mode) of the first step, the second step, the third step, and the fourth step. Stepper motor 8. Specifically, the stepping motor 8 is driven by, for example, an excitation mode corresponding to four steps as shown in FIG. Here, "2-phase drive" is taken as an example.

Further, in the first step, a pulse for causing the input terminal A to be in the Hi state, the input terminal A' to be in the Low state, the input terminal B to be in the Low state, and the input terminal B' to be in the Hi state is input, and the pulse corresponding to the pulse is used. The input excitation mode energizes the stepper motor.

Further, in the second step, a pulse is formed in which the input terminal A is in the Hi state, the input terminal A' is in the Low state, the input terminal B is in the Hi state, and the input terminal B' is in the Low state. The excitation mode corresponding to the input of the pulse energizes the stepper motor.

Further, in the third step, a pulse for forming an excitation mode in which the input terminal A is in the Low state, the input terminal A' is in the Hi state, the input terminal B is in the Hi state, and the input terminal B' is in the Low state is input. The excitation mode corresponding to the input of the pulse energizes the stepper motor.

Further, in the fourth step, a pulse for forming an excitation mode in which the input terminal A is in the Low state, the input terminal A' is in the Hi state, the input terminal B is in the Low state, and the input terminal B' is in the Hi state is input. The excitation mode corresponding to the input of the pulse energizes the stepper motor.

Further, when the stepping motor 8 is driven, the motor drive circuit 72 inputs a pulse to the stepping motor 8 in a predetermined order. The order in which the pulse is input from the motor drive circuit 72 to the stepping motor 8 is in two modes of "step up" and "step down". The case where the pulse is input in the ascending order is, for example, the following case: when the first pulse is the first pulse, the first step to the fourth step are used as the cycle of one cycle, according to the first step → the second step → Input the pulse in the order of the third step → the fourth step → the first step → (the same cycle is performed later). Further, the case where the pulse is input in descending order is, for example, a case where, when the fourth step is the first pulse, the fourth step to the first step are taken as the cycle of one cycle, and the fourth step → the third step is followed. → The second step → first step → fourth step → (the same cycle is performed later) input pulse.

Here, when the pulse is input in the ascending order, the stepping motor 8 rotates forward, and when the pulse is input in descending order, the stepping motor 8 is reversed. Further, when the stepping motor 8 rotates forward, the operating member 15 rotates in a counterclockwise direction in a plan view, and the diaphragm blades 5 and 6 move in a direction in which the diaphragm is contracted (a direction in which the aperture diameter is reduced). Further, when the stepping motor 8 is reversed, the operating member 15 is rotated clockwise in the plan view, and the diaphragm blades 5 and 6 are moved in the direction in which the aperture is opened (the direction in which the aperture diameter is increased).

Therefore, when the stepping motor 8 is rotated forward from the state (restricted state) in which the hooking portion 43B of the operating member 15 abuts against the stopper portion 4B, the operating member 15 is rotated toward the hook portion 43B away from the stopper portion 4B. . When the stepping motor 8 is reversed from the state in which the hook portion 43B of the operating member 15 is away from the stopper portion 4B, the operating member 15 rotates in the direction in which the hook portion 43B approaches the stopper portion 4B. In addition, the rotation of the stepping motor 8 is "forward rotation" or "reverse rotation", which is purely a concept in the present specification, and which rotation direction is used as "forward rotation" and "reverse rotation".

Further, in the other premise, when a pulse is input to the stepping motor 8 from a state in which the hooking portion 43B of the operating member 15 abuts against the stopper portion 4B, the pulse is sequentially input in accordance with the ascending order of the excitation mode. Stepper motor 8.

Further, as for the definition of the term, the "step stop angle" is defined as the stepping motor 8 when the stepping motor 8 is excited by one of the four excitation modes shown in FIG. 24 described above. The stopping angle of the direction of rotation. Further, the "first stop angle" is defined as the step stop angle when the stepping motor 8 is excited by the excitation mode of the first step, and the "second step stop angle" is determined to be the stepping motor by the excitation mode of the second step. 8 step stop angle during excitation. Similarly, the "third step stop angle" is determined as the step stop angle when the stepping motor 8 is excited by the excitation mode of the third step, and the "fourth step stop angle" is determined to be the stepping motor by the excitation mode of the fourth step. 8 step stop angle during excitation.

(Description of the driving method)

FIG. 25 is a flowchart showing a method of driving the diaphragm device 1 according to the embodiment of the present invention. The illustrated driving method is executed by the above-described control unit 70.

First, in step S1, it is judged whether or not initial setting is necessary. This determination process is performed, for example, by the motor control circuit 71. Whether or not the initial setting is necessary is determined by whether or not the operation performed in steps S2 and S3 described later (hereinafter referred to as "initial setting operation") has been performed at least once. That is, in the case where the initial setting operation is not completed, an affirmative determination is made in step S1, and in the case where the initial setting operation has been completed, a negative determination is made in step S1. Further, even if the initial setting operation has been completed before, if the affirmative determination is made in step S1 when the predetermined condition is satisfied, and the predetermined condition is not satisfied, a negative determination is made in step S1.

For example, when the elapsed time (or the number of elapsed days) after the initial setting operation has been performed reaches the preset reference time (or the number of reference days), an affirmative determination is made in step S1, and if the preset reference is not reached, The time (or the number of base days, etc.) is negative. In addition, for example, when the number of times of the diaphragm adjustment operation (the operation of adjusting the diaphragm) performed by the diaphragm device 1 after the initial setting operation is performed has reached a predetermined reference number, an affirmative determination is made in step S1. A negative decision is made if the preset number of benchmarks is not reached.

In addition, for example, when the power of the diaphragm device 1 is turned on (including turning on again) or when a reset button (not shown) is pressed, etc., in step S1, A positive determination is made, and thereafter, a negative determination is made in step S1 as long as no depression of the reset button or the like is detected.

In the case where an affirmative determination is made in step S1, the stepping motor 8 is driven by the first driving period, the second driving period, and the third driving period described below. Further, when a negative determination is made in step S1, the first driving period and the second driving period are skipped, and the stepping motor 8 is driven by the third driving period.

(during the first drive period)

Next, in step S2, the stepping motor 8 is driven so that the one end (the moving end on the open side) of the range of movement of the diaphragm blades 5, 6 is restricted by the stopper portion 4B in the first driving period. In this case, the motor drive circuit 72 receives the control command signal from the motor control circuit 71, and inputs the stepping motor 8 in the descending order so that the hook portion 43B of the actuating member 15 abuts against the stopper portion 4B and is sufficient. The number of pulses. For example, when the number of pulses required from the state in which the hook portion 43A of the action member 15 approaches (or contacts) the wall surface to the hook portion 43B of the action member 15 abuts against the stopper portion 4B is N, The motor drive circuit 72 inputs N (or N or more) pulses into the stepping motor 8 in descending order, wherein the wall surface is the other end (the moving end on the contraction side) of the range of movement of the diaphragm blades 5, 6, for example The stopper portion 4B is formed as a wall surface that is integrally formed.

(during the second drive period)

Next, in the step S3, the second driving period is started from the state in which the one end of the movement range of the diaphragm blades 5, 6 is restricted by the stopper portion 4B, and the step stop angle (predetermined angle) corresponding to this time is used. The pulse of the predetermined order is used as a pulse to be input to the stepping motor 8 (referred to as an "input start pulse"), and the stepping motor 8 is driven in a direction restricted by the release stopper 4B. Specifically, the motor drive circuit 72 receives the control command signal from the motor control circuit 71 and inputs the pulse to the stepping motor 8 in the ascending order so that the hook portion 43B of the operating member 15 is away from the stopper portion 4B. The input start pulse at this time is determined in advance by, for example, the following conditions.

In the method of manufacturing the diaphragm device 1, when the step stop angle in the state in which one end of the range of movement of the diaphragm blades 5 and 6 is restricted by the stopper portion 4B is set as the first stop angle, The pulse of the excitation mode in the second step is used as an input start pulse.

In the case where the step stop angle in the state in which the one end of the range of movement of the diaphragm blades 5 and 6 is restricted by the stopper portion 4B is set to the second step stop angle, the pulse corresponding to the excitation mode of the third step is used as the pulse. Enter the start pulse.

In the case where the step stop angle in the state in which the one end of the range of movement of the diaphragm blades 5 and 6 is restricted by the stopper portion 4B is set to the third step stop angle, the pulse corresponding to the excitation mode of the fourth step is used as the pulse. Enter the start pulse.

In the case where the step stop angle in the state in which the one end of the range of movement of the diaphragm blades 5 and 6 is restricted by the stopper portion 4B is set to the fourth step stop angle, the pulse corresponding to the excitation mode of the first step is used as the pulse. Enter the start pulse.

(during the third drive period)

Next, in step S4, in the third driving period, the stepping motor 8 is driven in such a manner that the step-up order, the descending order, and the number of pulses input to the stepping motor 8 are switched in accordance with the control command signal. The driving of the stepping motor 8 in the third driving period can be performed in a continuous manner with the driving of the stepping motor 8 in the second driving period, and the stepping motor 8 can be temporarily stopped at the end of the second driving period. Then transition to the third drive period.

In the third driving period, the motor control circuit 71 outputs a control command signal to the motor drive circuit 72 in accordance with the value of the target aperture diameter. Further, the motor drive circuit 72 receives the control command signal from the motor control circuit 71, and switches the step-up sequence, the descending order, and the number of pulses input to the stepping motor 8. The control command signal specifies the order (upward or descending order) and the number of pulses to be input to the stepping motor 8, to match the value of the target aperture. In addition, the value of the target aperture is determined by a light amount adjustment unit (not shown) based on the amount of received light in the photoelectric conversion element, and the result is notified to the control unit 70. The light amount adjustment unit is, for example, a functional unit incorporated in the control system of the above camera.

Here, in the third driving period, the control unit 70 manages the number of pulses input to the stepping motor 8 in the following manner. First, the state in which one end of the range of movement of the diaphragm blades 5 and 6 is restricted by the stopper 4B used in the first driving period is used as a reference (starting point). Then, for example, the number of pulses (hereinafter referred to as "the number of input pulses") input to the stepping motor 8 from the reference state is counted by the motor control circuit 71 using the input information of the pulse given by the motor drive circuit 72. For the counting of the number of input pulses, for example, the above reference state is set to count value = 0 (zero). Then, the count value is incremented by 1 at the timing when the above-described input start pulse is input to the stepping motor 8. Therefore, the count value is set to 1 at the timing when the input start pulse is input to the stepping motor 8. Thereafter, each time a pulse is input to the stepping motor 8 in the ascending order, the count value is incremented by one. Further, each time a pulse is input to the stepping motor 8 in descending order, the count value is successively decremented by one.

Thereby, the count value of the number of input pulses corresponds to the value of the aperture diameter in a 1:1 relationship. Therefore, if the correspondence between the two is grasped in advance by experiments, and the control data (for example, table data, calculation program data, etc.) is included in the control program of the control unit 70 or the like based on the experimental data, etc., during the third driving period. The aperture diameter can be adjusted by the pre-administration control. The details are described below.

When the target value of the aperture diameter specified by the control command signal to be used is set to "D1", the motor control circuit 71 reads the target value of the number of input pulses corresponding to the target value of the aperture aperture from the data for control. Then, the control command signal of the order and the number of designated pulses is generated and output to the motor drive circuit 72 so that the count value of the number of input pulses coincides with the target value "D1" of the number of input pulses. In this manner, the motor drive circuit 72 inputs the number of pulses specified by the control command signal to the stepping motor 8 in the order specified by the control command signal (in ascending order or descending order).

For example, when the count value of the number of input pulses is greater than D1 "Da" with respect to the target value "D1" of the number of input pulses, the difference motor "Da-D1" is input to the stepping motor 8 in descending order. The number of pulses. On the other hand, when the count value of the number of input pulses is less than D1 "Db" with respect to the target value "D1" of the number of input pulses, the difference "D1-Db" is input to the stepping motor 8 in the ascending order. The number of pulses. Then, when the target value of the number of input pulses is switched from "D1" to "D2", the pulse input step is performed so that the count value of the number of pulses matches the target value "D2" of the number of input pulses. Into the motor 8. Thereby, the aperture diameter can be adjusted in accordance with the target value.

<6. Effects according to the present embodiment>

The effects of the embodiments of the present invention are described below.

First, when the diaphragm device 1 is driven by the above-described driving method, when the input start pulse is input to the stepping motor 8 from the state (restricted state) in which the hooking portion 43B of the operating member 15 abuts against the stopper portion 4B, the response is input. At the input of this pulse, the stepping motor 8 rotates. Further, the rotation operation of the stepping motor 8 can be obtained for all the aperture devices 1 to which the manufacturing method according to the embodiment of the present invention is applied.

Therefore, when a certain number of pulses are input to the respective aperture devices 1 manufactured in the ascending order in the restricted state, the stepping motors 8 are rotated by the same amount of rotation in all the aperture devices 1. Therefore, when the stepping motor 8 is driven by the same condition (the number and order of pulses) from the restricted state, the stop position at the time of movement of the diaphragm blades 5, 6 does not cause an offset (deviation). Therefore, when the stepping motor 8 is driven by the abutting method, it is possible to prevent the positional displacement of the diaphragm members (the diaphragm blades 5, 6) during the diaphragm adjustment. As a result, in the diaphragm device 1 using the stepping motor 8 as a drive source, it is possible to achieve high precision of the diaphragm adjustment without using a sensor or the like.

Further, in particular, if the technical idea of the present invention is applied to the aperture device 1 as employed in the present embodiment, the opening diameter of the opening formed by the diaphragm member (the diaphragm blades 5, 6) depends on the movement of the diaphragm member. In the aperture device that is continuously changed (without a segment), it is expected that a more remarkable effect can be achieved in achieving high precision of the diaphragm device.

In the present embodiment, the input start pulse is set to be in the step-up sequence corresponding to the pulse input with respect to the step stop angle in a state in which one end of the range of movement of the diaphragm blades 5 and 6 is restricted by the stopper portion 4B. The next step stops the angle (the next excitation mode) corresponding to the pulse. Therefore, when the input start pulse is input to the stepping motor 8 from the state in which the hook portion 43B of the operating member 15 abuts against the stopper portion 4B, the stepping motor 8 can be made to have no delay in operation with respect to the input of the pulse. Rotate.

(reference form)

Regarding the reference aspect for preventing the positional shift of the diaphragm member at the time of the above-described diaphragm adjustment, the following manner is considered.

In other words, for each of the aperture devices (which have been incorporated in the stepping motor) after assembly, it is investigated when one end of the range of movement of the diaphragm member is restricted by the abutment between one of the constituent members of the diaphragm device and the stopper, The stepping motor stops at the angular position of the excitation mode corresponding to which step. In the case where a pulse is input to the stepping motor from the state in which one end of the range of movement of the diaphragm member is restricted by the stopper, the angle corresponding to the stop of the stepping motor at this time (hereinafter referred to as "initial stop angle") The pulses begin to be input in sequence.

For example, when the stepping motor stops at the position corresponding to the excitation mode of the first step, follow the second step → the third step → the fourth step → the first step → the second step → (the same cycle is performed later) The order is input to the pulse.

And, when the stepping motor stops at the position corresponding to the excitation mode of the second step, follow the third step → fourth step → first step → second step → third step → (the same cycle is performed later) The order is input to the pulse.

And, when the stepping motor stops at the position corresponding to the exciting mode of the third step, starting from the state, according to the fourth step → first step → second step → third step → fourth step → (after The same cycle is performed in the order of the input pulses.

And, when the stepping motor is stopped at the position corresponding to the exciting mode of the fourth step, starting from the state, according to the first step → the second step → the third step → the fourth step → the first step → (after The same cycle is performed in the order of the input pulses.

Thus, regardless of the angular position at which the stepping motor is stopped, when a predetermined number of pulses are input to the stepping motor from a state in which one of the constituent members of the diaphragm device abuts against the stopper, there is no input based on the pulse. The driving of the stepping motor is performed to cause a shift in the position at which the final diaphragm member stops. However, in actuality, when the above method is employed, it is necessary to investigate the "initial stop angle of the stepping motor" for each of the plurality of aperture devices after the assembly, and to set the stop-based based on the results of the investigation for each of the aperture devices. The pulse that starts the input to the stepping motor (hereinafter referred to as "initial input pulse") is started in the abutment state. Therefore, the manufacturing process of the aperture device becomes complicated.

On the other hand, when the aperture device according to the embodiment of the present invention is used, when the stepping motor is used as the drive source for diaphragm adjustment, the initial stop angle of the stepping motor is not investigated or The initial stop angle sets the initial input pulse, and still prevents the positional shift of the diaphragm member when the aperture is adjusted.

Further, the technical scope of the present invention is not limited to the above-described embodiments, and various modifications and improvements are also made in the range in which the specific effects obtained by the constituent elements of the invention or a combination thereof can be derived. Specific modifications will be described below.

<7. Modifications>

[Modification 1]

In the embodiment of the present invention, a mechanism (gear reduction mechanism) in which a plurality of gears are combined is used as an example of the driving force transmission mechanism, but the present invention is not limited thereto. For example, in another example of the driving force transmission mechanism, a mechanism that combines the positive pulley (the toothed pulley) and the fixed belt may be used.

[Modification 2]

In the embodiment of the present invention, the two-phase excitation method is employed as the driving method (excitation method) of the stepping motor. However, the present invention is not limited thereto, and other methods such as a 1-2 phase excitation method or the like can be employed.

[Modification 3]

In the embodiment of the present invention, in one end and the other end of the moving range of the diaphragm blades 5, 6 as an example of the diaphragm member, the moving end of the side on which the aperture is reduced is restricted by the stopper portion 4B, and the moving end is used The number and order of the pulses input to the stepping motor 8 are switched for the reference, but the present invention is not limited thereto, and the moving end of one side of the aperture can be used as a reference.

Further, the structure of the diaphragm member is not limited to the above-described diaphragm blades 5 and 6, and other configurations may be employed.

[Modification 4]

In the embodiment of the present invention, the aperture member is formed by using two aperture blades, and the apertures of the apertures are continuously changed by moving the two aperture blades in opposite directions. However, the present invention does not Limited to this. For example, the opening diameter of the opening may be changed by moving only one of the two aperture blades. Further, in another example of the diaphragm member, in the present invention, for example, a diaphragm device having a mechanism in which a diaphragm-shaped diaphragm member having a plurality of aperture holes having different apertures is used, by using the diaphragm The member is moved such that either of the apertures is aligned with a aperture having a larger aperture than the aperture.

[Modification 5]

In the embodiment of the present invention, when the two-phase stepping motor 8 is driven by the two-phase driving method, the step stop angle in the state in which one end of the moving range of the diaphragm blades 5 and 6 is restricted by the limiting unit is used. When the input start pulse is input to the stepping motor 8, the pulse corresponding to the next step stop angle is set as the input start pulse in accordance with the ascending order of the pulse input, but the present invention is not limited thereto.

That is, as long as the intended purpose is achieved, the pulse corresponding to the stop angle of the step, or the pulse input may be input with respect to the step stop angle in a state in which one end of the range of movement of the diaphragm blades 5, 6 is restricted by the restriction unit. The pulse corresponding to the next step stop angle in the descending order is set as the input start pulse.

For example, it is assumed that the step stop angle in a state in which one end of the range of movement of the diaphragm blades 5, 6 is restricted by the restriction unit is a step stop angle at which the stepping motor 8 is stopped when a pulse corresponding to the excitation mode of the second step is input. In this case, any one of the pulses corresponding to the excitation mode corresponding to the first step, the second step, or the third step may be set as the input start pulse.

Further, when the pulse corresponding to the excitation mode of the fourth step is set as the input start pulse, when the input start pulse is actually input to the stepping motor 8, the rotation operation of the stepping motor 8 cannot be determined to be unique. Therefore, the intended purpose cannot be achieved.

[Modification 6]

In the embodiment of the present invention, the operation mode of the operation member 15 is a rotation operation, but the present invention is not limited thereto, and may be another operation mode such as a revolving operation or a linear operation.

Further, the present invention is not limited to a diaphragm device, a camera, a method of manufacturing an aperture device and a camera, a driving method, and the like, and can be applied to an electronic device (for example, a security device) including the camera or a method of manufacturing the same. Further, such an electronic device or a method of manufacturing the same can be extracted as one of the inventions. The electronic device is configured to include a camera according to an embodiment of the present invention and an image processing unit that processes an image signal input from the camera.

Further, the present invention is not limited to the diaphragm device that performs diaphragm adjustment by moving the diaphragm blades 5 and 6 as an example of the diaphragm member, and can be widely applied to the above-described diaphragm member and using a stepping motor as a movement of various moving members. The mobile drive of the drive source. Further, such a moving member driving device can be extracted as one of the inventions.

1. . . Aperture device

2. . . Aperture function

3. . . Aperture drive unit

4. . . Blade substrate

4A, 22. . . Protrusion

4B. . . Stop

5. . . Aperture blade

6. . . Aperture blade

7. . . Blade cover

8. . . Stepper motor

9. . . Cover member

10. . . Fork member

11, 12, 13, 14. . . Intermediate gear

15. . . Action component

16. . . Bracket member

17. . . First substrate portion

18. . . Second substrate portion

19. . . Small hole

20. . . Zhou wall

21, 30. . . Opening

twenty three. . . Arm

24, 38, 41. . . Hole

25, 28. . . Boot slot

26, 29. . . Engagement hole

27. . . Bending

31A, 31B. . . Clearance groove

32. . . Claw

33. . . Wiring department

34. . . Connector part

35. . . First hook

36. . . Second hook

37. . . Guide wall

39. . . Grip

40. . . Leg

42. . . Clearance

43A. . . Hook

43B. . . Hook

44. . . Clearance hole

45. . . Internal gear section

46. . . Shaft hole

47, 53. . . Depression

48, 54. . . magnet

49. . . Side wall

50. . . Bottom plate

51. . . Hook hole

52, 66. . . Sales department

55, 56, 64. . . Shaft

57. . . framework

58. . . Rotating body

59. . . First storage unit

60. . . Second storage unit

61. . . Notch

62, 63. . . Against the wall

65. . . Rod

67. . . Stud section

68. . . Drive gear

69. . . Connector substrate

70. . . Control department

71. . . Motor control circuit

72. . . Motor drive circuit

100. . . camera

101. . . Mounting base

102. . . Camera body

103. . . Tube barrel

104. . . Objective lens

105. . . Photographic element (photoelectric conversion element)

M. . . mark

θ. . . Opening angle

S1~S4. . . step

1(A) and 1(B) are views showing a configuration example of a camera to which the present invention is applied.

2 is a perspective view showing an example of a mechanical configuration of an aperture device according to an embodiment of the present invention.

Fig. 3 is a perspective view showing the configuration of a blade substrate.

4 is a perspective view of the blade substrate in the middle of mounting of the member as viewed from the lower side (back side).

Fig. 5 is a perspective view showing the configuration of an action member.

FIG. 6 is a block diagram showing a schematic configuration of a control system of the diaphragm device 1 according to the embodiment of the present invention.

Fig. 7 is a perspective view showing a mounting procedure of the bracket member.

Fig. 8 is a perspective view showing an installation procedure of the action member.

Fig. 9 is a perspective view showing an installation procedure of the intermediate gear (14).

Fig. 10 is a view showing the structure of a jig for assembly, (A) is a plan view, and (B) is a perspective view.

Fig. 11 is a view (1) for explaining a method of using a jig for assembly.

Fig. 12 is a view (2) for explaining a method of using the jig for assembly.

Fig. 13 is a perspective view showing a mounting procedure of the intermediate gear (13).

Fig. 14 is a perspective view showing a mounting procedure of the intermediate gear (12).

Fig. 15 is a perspective view showing an installation procedure of the intermediate gear (11).

Fig. 16 is a perspective view showing a mounting procedure of a yoke member.

Figure 17 is a perspective view showing a mounting procedure of the cover member.

Fig. 18 is a perspective view showing a mounting procedure of the stepping motor.

Fig. 19 is an enlarged view showing the meshing state of the intermediate gear (11) and the drive gear 68.

Fig. 20 is a plan view showing a connected state of a power transmission system from a stepping motor to an aperture blade.

Fig. 21 is a side view showing a connected state of a power transmission system from a stepping motor to an aperture blade.

Fig. 22 is a perspective view showing a connected state of the power transmission system from the stepping motor to the diaphragm blade as viewed from above.

Fig. 23 is a perspective view showing a connected state of the power transmission system from the stepping motor to the diaphragm blades as viewed from below.

Fig. 24 is a view showing an example of a driving method of the stepping motor.

Fig. 25 is a flow chart showing an example of a driving method of the stepping motor.

1. . . Aperture device

2. . . Aperture function

3. . . Aperture drive unit

4. . . Blade substrate

5. . . Aperture blade

6. . . Aperture blade

7. . . Blade cover

8. . . Stepper motor

9. . . Cover member

10. . . Fork member

11, 12, 13, 14. . . Intermediate gear

15. . . Action component

16. . . Bracket member

17. . . First substrate portion

18. . . Second substrate portion

20. . . Zhou wall

21, 30. . . Opening

twenty two. . . Protrusion

twenty three. . . Arm

24, 38, 41. . . Hole

25, 28. . . Boot slot

26, 29. . . Engagement hole

27. . . Bending

31A, 31B. . . Clearance groove

32. . . Claw

33. . . Wiring department

34. . . Connector part

35. . . First hook

36. . . Second hook

37. . . Guide wall

39. . . Grip

40. . . Leg

42. . . Clearance

43A. . . Hook

43B. . . Hook

44. . . Clearance hole

45. . . Internal gear section

46. . . Shaft hole

47, 53. . . Depression

48, 54. . . magnet

49. . . Side wall

50. . . Bottom plate

51. . . Hook hole

52. . . Sales department

55, 56. . . Shaft

Claims (7)

An aperture device comprising: an aperture member having an opening through which light passes; and an operation member moving the aperture member in a direction in which an opening diameter of the opening is changed; and a limiting unit Restricting at least one end of a moving range in which the operating member moves the diaphragm member; a stepping motor as a driving source; and a driving force transmitting mechanism that transmits a driving force of the stepping motor to the operating member; and the aperture The opening diameter of the opening formed by the member is continuously changed by the movement of the diaphragm member, and the stepping motor and the driving force transmitting mechanism are assembled such that one end of the moving range of the diaphragm member is restricted by the limiting unit At this time, the stop angle of the stepping motor in the rotation direction is a predetermined predetermined angle. An aperture device according to claim 1, wherein the aperture device includes: a motor drive unit that inputs a pulse into the stepping motor in a predetermined order to drive the stepping motor in a step-up sequence or a descending sequence; The motor driving unit drives the stepping motor at least during a first driving period, a second driving period, and a third driving period, wherein in the first driving period, the moving range of the diaphragm member is restricted by the limiting unit The stepping motor is driven by one end, and in the second driving period, starting from a state in which one end of the moving range of the diaphragm member is restricted by the limiting unit, a pulse in a predetermined order corresponding to the predetermined angle is used a pulse to be input to the stepping motor, and a pulse is sequentially input to the stepping motor, thereby driving the stepping motor in a direction restricted by the limiting unit, in the third driving period, according to a control command signal Switch input to this step The stepping motor is driven in a step-up sequence, a descending order, and a number of pulses of the motor. The aperture device of claim 2, wherein the motor driving unit, in the second driving period, is in an excitation mode corresponding to a next step of a pulse input when the stepping motor is stopped at the predetermined angle A pulse is used as a pulse to be input to the stepping motor. A camera comprising: the aperture device according to any one of claims 1 to 3; and a photoelectric conversion element that converts light incident through the opening formed by the aperture member into electric signal. A method of manufacturing an aperture device comprising: an aperture member having an opening through which light passes; and an operation member moving the aperture member in a direction in which an opening diameter of the opening is changed; and a limiting unit to abut Restricting at least one end of the range of movement of the aperture member by the action member; a stepping motor as the drive source; and a drive force transmitting mechanism for driving the stepping motor a force is transmitted to the operating member; and an opening diameter of the opening formed by the diaphragm member is continuously changed by movement of the diaphragm member; the manufacturing method of the aperture device is characterized in that the aperture device is manufactured The stepping motor and the driving force transmission mechanism are mounted in a state where the restriction unit restricts one end of the movement range of the diaphragm member and the stop angle of the rotation direction of the stepping motor is a predetermined predetermined angle. An electronic device comprising: a camera of claim 4; An image processing unit that processes an image signal output from the camera. A moving member driving device, comprising: a moving member formed with an opening portion; an action member for moving the moving member; and a limiting unit for restricting the action caused by the acting member At least one end of the moving range of the moving member; a stepping motor as a driving source; and a driving force transmitting mechanism that transmits the driving force of the stepping motor to the operating member; and an opening diameter of the opening formed by the moving member Continuously changing by the movement of the moving member, the stepping motor and the driving force transmitting mechanism are assembled such that when one end of the moving range of the moving member is restricted by the limiting unit, the rotation direction of the stepping motor The stop angle becomes a predetermined predetermined angle.