Blade driving apparatus for cameras

Abstract

A blade driving apparatus for cameras includes a base plate having an aperture section for a photographing optical path; a partition plate having an aperture section for the photographing optical path so that a blade chamber is interposed between the base plate and the partition plate; a cover frame having an actuator chamber between the partition plate and the cover frame; a permanent magnet rotor rotatably mounted on the cover frame so that an output pin is introduced into the blade chamber; a yoke in which tops of two legs constructed as magnetic pole sections are opposite to the peripheral surface of the rotor in the actuator chamber and one of the two legs is fitted into a bobbin around which a coil is wound; and at least one blade rotatably mounted to a shank for at least one blade which is set upright on the cover frame and is introduced into the blade chamber, and introduced into, and removed from, the exposure aperture by the output pin.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plan view showing a state of Embodiment 1 brought about immediately before photography;

FIGS. 2A, 2B, and 2C are sectional views for explaining the assembly process of Embodiment 1, showing the cover frame around which the coil is wound, a state where the yoke is incorporated in the cover frame, and a state where the permanent magnet rotor is incorporated in the cover frame, respectively;

FIGS. 3A, 3B, and 3C are sectional views for explaining the assembly process subsequent to FIG. 2C, showing a state where the partition plate is incorporated in the cover frame, a state where the shutter blades are incorporated in the cover frame, and a state where the cover frame is finally mounted to the base plate, respectively;

FIG. 4 is a plan view showing a state of Embodiment 1 brought about immediately after photography is completed;

FIGS. 5A, 5B, and 5C are views of an example of a mobile phone incorporating the shutter apparatus of Embodiment 1, showing a front view of the phone that is not used, a left side view of the phone of FIG. 5A, and a front view of the phone that is used, respectively;

FIG. 6 is an exploded perspective view showing a modified example of Embodiment 1;

FIG. 7 is a plan view showing a state of Embodiment 2 brought about immediately before photography;

FIGS. 8A, 8B, 8C, and 8D are sectional views for explaining the assembly process of Embodiment 2, showing two cover frames around which coils are wound, a state where individual yokes are incorporated in the two cover frames, a state where individual permanent magnet rotors are incorporated in the two cover frames, and a state where the partition plate is incorporated in the two cover frames, respectively;

FIGS. 9A, 9B, 9C, and 9D are sectional views for explaining the assembly process subsequent to FIG. 8D, showing a state where one stop blade is incorporated in one cover frame, a state where an intermediate plate is incorporated in two cover frames, a state where three shutter blades are incorporated in the other cover frame, and the two cover frames are finally mounted to the bade plate, respectively;

FIG. 10 is an enlarged sectional view showing the unit of FIG. 9D that is divided into two halves and enlarged; and

FIG. 11 is a plan view showing a state of Embodiment 2 brought about immediately after photography is completed.

Claims

1. A blade driving apparatus for cameras, comprising: a base plate having an aperture section for a photographing optical path;a partition plate having an aperture section for the photographing optical path so that an exposure aperture is restricted by at least one of aperture sections of the base plate and the partition plate, mounted to one surface of the base plate so that a blade chamber is interposed between the base plate and the partition plate;a cover frame mounted to the base plate at a side position of the exposure aperture so that the partition plate is interposed between the base plate and the cover frame, having an actuator chamber between the partition plate and the cover frame;a permanent magnet rotor placed in the actuator chamber and rotatably mounted to a shank for the rotor that is set upright on the cover frame so that an output pin integrally rotated is introduced into the blade chamber;a yoke shaped like a letter “U” in which tops of two legs constructed as magnetic pole sections are opposite to a peripheral surface of the rotor in the actuator chamber and one of the two legs is fitted into a bobbin around which a coil is wound; andat least one blade placed in the blade chamber, rotatably mounted to a shank for at least one blade which is set upright on the cover frame and is introduced into the blade chamber, and introduced into, and removed from, the exposure aperture by the output pin.

2. A blade driving apparatus for cameras according to claim 1, wherein a top of the shank for the rotor is introduced into the blade chamber and the shank for the rotor is also used as a shank for the blade.

3. A blade driving apparatus for cameras according to claim 1 or 2, wherein the bobbin is molded integrally with the cover frame.

4. A blade driving apparatus for cameras according to claim 1 or 2, wherein the cover frame has a notch and a part of the bobbin and a part of the coil are placed in the notch.

5. A blade driving apparatus for cameras, comprising: a base plate having an aperture section for a photographing optical path;a partition plate having an aperture section for the photographing optical path so that an exposure aperture is restricted by at least one of aperture sections of the base plate and the partition plate, mounted to one surface of the base plate so that a blade chamber is interposed between the base plate and the partition plate;first and second cover frames each mounted to the base plate at the side position of the exposure aperture so that the partition plate is interposed between the base plate and the cover frame, having first and second actuator chambers between the partition plate and the cover frames;first and second permanent magnet rotors separately placed in the first and second actuator chambers and rotatably mounted to shanks for rotors which are set upright on the first and second cover frames, respectively, so that output pins, each integrally rotated, are introduced into the blade chamber;first and second yokes each shaped like a letter “U” in which tops of two legs of each yoke constructed as magnetic pole sections are opposite to a peripheral surface of each of the first and second permanent magnet rotors and one of the two legs of each yoke is fitted into a bobbin around which a coil is wound;first and second shanks for blades set upright on the first and second cover frames, at least one for each of the cover frames; andfirst and second blades, each including at least one, rotatably mounted to the first and second shanks for the blades, respectively, in the blade chamber and introduced into, and removed from, the exposure aperture by individual output pins of the first and second permanent magnet rotors.

6. A blade driving apparatus for cameras according to claim 5, wherein at least one of the shanks for the first and second permanent magnet rotors is constructed so that a top thereof is introduced into the blade chamber, and is also used as one of shanks for the first and second blades.

7. A blade driving apparatus for camera according to claim 5 or 6, wherein at least one of the first and second bobbins is molded integrally with the cover frame.

8. A blade driving apparatus for cameras according to claim 5 or 6, wherein at least one of the first and second cover frames has a notch and a part of one of the first and second bobbins and a part of the coil wound around the one bobbin are placed in the notch.

9. A blade driving apparatus for camera according to claim 1 or 5, wherein an amount of light of a solid-state image sensor is controllable.

10. An information terminal provided with a blade driving apparatus for cameras, the blade driving apparatus for cameras comprising: a base plate having an aperture section for a photographing optical path;a partition plate having an aperture section for the photographing optical path so that an exposure aperture is restricted by at least one of aperture sections of the base plate and the partition plate, mounted to one surface of the base plate so that a blade chamber is interposed between the base plate and the partition plate;a cover frame mounted to the base plate at a side position of the exposure aperture so that the partition plate is interposed between the base plate and the cover frame, having an actuator chamber between the partition plate and the cover frame;a permanent magnet rotor placed in the actuator chamber and rotatably mounted to a shank for the rotor that is set upright on the cover frame so that an output pin integrally rotated is introduced into the blade chamber;a yoke shaped like a letter “U” in which tops of two legs constructed as magnetic pole sections are opposite to a peripheral surface of the rotor in the actuator chamber and one of the two legs is fitted into a bobbin around which a coil is wound; andat least one blade placed in the blade chamber, rotatably mounted to a shank for at least one blade which is set upright on the cover frame and is introduced into the blade chamber, and introduced into, and removed from, the exposure aperture by the output pin,the blade driving apparatus for cameras being capable of controlling an amount of light of a solid-state image sensor.

11. An information terminal provided with a blade driving apparatus for cameras, the blade driving apparatus for cameras comprising: a base plate having an aperture section for a photographing optical path;a partition plate having an aperture section for the photographing optical path so that an exposure aperture is restricted by at least one of aperture sections of the base plate and the partition plate, mounted to one surface of the base plate so that a blade chamber is interposed between the base plate and the partition plate;first and second cover frames each mounted to the base plate at the side position of the exposure aperture so that the partition plate is interposed between the base plate and the cover frame, having first and second actuator chambers between the partition plate and the cover frames;first and second permanent magnet rotors separately placed in the first and second actuator chambers and rotatably mounted to shanks for rotors which are set upright on the first and second cover frames, respectively, so that output pins, each integrally rotated, are introduced into the blade chamber;first and second yokes each shaped like a letter “U” in which tops of two legs of each yoke constructed as magnetic pole sections are opposite to a peripheral surface of each of the first and second permanent magnet rotors and one of the two legs of each yoke is fitted into a bobbin around which a coil is wound;first and second shanks for blades set upright on the first and second cover frames, at least one for each of the cover frames; andfirst and second blades, each including at least one, rotatably mounted to the first and second shanks for the blades, respectively, in the blade chamber and introduced into, and removed from, the exposure aperture by individual output pins of the first and second permanent magnet rotors,the blade driving apparatus for cameras being capable of controlling an amount of light of a solid-state image sensor.

12. An in-vehicle camera provided with a blade driving apparatus for cameras, the blade driving apparatus for cameras comprising: a base plate having an aperture section for a photographing optical path;a partition plate having an aperture section for the photographing optical path so that an exposure aperture is restricted by at least one of aperture sections of the base plate and the partition plate, mounted to one surface of the base plate so that a blade chamber is interposed between the base plate and the partition plate;a cover frame mounted to the base plate at a side position of the exposure aperture so that the partition plate is interposed between the base plate and the cover frame, having an actuator chamber between the partition plate and the cover frame;a permanent magnet rotor placed in the actuator chamber and rotatably mounted to a shank for the rotor that is set upright on the cover frame so that an output pin integrally rotated is introduced into the blade chamber;a yoke shaped like a letter “U” in which tops of two legs constructed as magnetic pole sections are opposite to a peripheral surface of the rotor in the actuator chamber and one of the two legs is fitted into a bobbin around which a coil is wound; andat least one blade placed in the blade chamber, rotatably mounted to a shank for at least one blade which is set upright on the cover frame and is introduced into the blade chamber, and introduced into, and removed from, the exposure aperture by the output pin,the blade driving apparatus for cameras being capable of controlling an amount of light of a solid-state image sensor.

13. An in-vehicle camera provided with a blade driving apparatus for cameras, the blade driving apparatus for cameras comprising: a base plate having an aperture section for a photographing optical path;a partition plate having an aperture section for the photographing optical path so that an exposure aperture is restricted by at least one of aperture sections of the base plate and the partition plate, mounted to one surface of the base plate so that a blade chamber is interposed between the base plate and the partition plate;first and second cover frames each mounted to the base plate at the side position of the exposure aperture so that the partition plate is interposed between the base plate and the cover frame, having first and second actuator chambers between the partition plate and the cover frames;first and second permanent magnet rotors separately placed in the first and second actuator chambers and rotatably mounted to shanks for rotors which are set upright on the first and second cover frames, respectively, so that output pins, each integrally rotated, are introduced into the blade chamber;first and second yokes each shaped like a letter “U” in which tops of two legs of each yoke constructed as magnetic pole sections are opposite to a peripheral surface of each of the first and second permanent magnet rotors and one of the two legs of each yoke is fitted into a bobbin around which a coil is wound;first and second shanks for blades set upright on the first and second cover frames, at least one for each of the cover frames; andfirst and second blades, each including at least one, rotatably mounted to the first and second shanks for the blades, respectively, in the blade chamber and introduced into, and removed from, the exposure aperture by individual output pins of the first and second permanent magnet rotors,the blade driving apparatus for cameras being capable of controlling an amount of light of a solid-state image sensor.