CN101080666A - Lens hood device, and image pickup device using the same - Google Patents

Abstract

The invention provides a lens hood device, which has a baffle shell (11) and a plurality of lens baffles (14-17), the baffle shell (11) covers the lens baffle unit (32) front and back, and have non-circular openings at the positions where the optical axis passes, and the plurality of lens baffles (14-17) are freely rotatably arranged in a direction parallel to the main plane of the baffle shell (11), and It can be rotated between a position covering the entire surface of the opening and a position opening the opening. The lens barriers (14-17) are accommodated in the barrier case (11) so as not to be exposed in the opening when they are in a position to open the opening. Thus, it is possible to improve operability without increasing the size of the imaging device.

Description

Lens hood device and camera device using it

technical field

The present invention relates to a lens hood device effectively used in imaging devices such as video recorders and digital cameras.

Background technique

Generally, in video recording, a lens hood device is attached to the front end of the lens of the main body to prevent stray light from entering the lens. In addition, when the video recorder is not in use, a lens cap is attached to the subject-side front end of the lens barrel of the main body to protect the lens (for example, refer to Patent Documents 1 to 3).

Hereinafter, conventional lens hoods and lens caps will be described.

32 to 35 show a state where a conventional lens hood and lens cap are attached to the main body of the video recorder. Fig. 32 is a perspective view showing a state where the lens cap and the lens hood are detached. 33 is a perspective view showing a state where a lens hood and a lens cap are attached to the video recorder main body. Fig. 34 is a perspective view of a state in which the lens cap is suspended from the main body by a string. Fig. 35 is a perspective view showing a state where the lens cap is attached to the clamp band.

The video recorder main body 101 is a device that converts an incident optical signal into an electrical signal, generates a video signal (and an audio signal) from the electrical signal, and is capable of recording and reproducing a recording medium. The lens cover 102 houses optical components such as a lens unit and an imaging element, and covers the outer frame of the lens unit. In addition, the lens cover 102 is made of resin. The front lens frame 103 is arranged at the front end of the lens cover 102 in the optical axis direction, and fixes the lens unit from the front side. In addition, a female thread portion 103a is formed on the inner peripheral portion of the front lens frame 103, and a lens hood 104 and a converter mirror (not shown) can be attached thereto. By installing the lens hood 104 on the front of the lens, scattered light is reduced and stray light in the image signal is prevented.

By attaching the lens cap 105 to the lens hood 104 disposed on the front of the lens, damage and contamination of the lens are prevented. In addition, the lens cap 105 can be mounted on the front lens frame 103 or the lens hood 104 . The hole portion 105 a is provided on the back surface of the lens cap 105 , and the lens cap 105 can be held on the main body handle by fitting with the protrusion of the holding protrusion 107 . The lens cap string 106 connects the video recorder main body 101 and the lens cap 105 to prevent the lens cap 105 from falling when the lens cap 105 is detached from the lens hood 104 .

A holding protrusion 107 is attached to the handle of the main body, and the lens cap 105 can be detached. The protrusion 107 a is formed on the holding protrusion 107 and can be fitted into the hole 105 a provided on the rear surface of the lens cover 105 .

The lens unit 108 constitutes a lens unit, and is partially exposed through a circular opening provided in the lens front frame 103 .

The operation will be described below.

As shown in FIG. 33 , when the video recorder is not in use, a lens cap 105 is attached to the front end of a lens hood 104 attached to the video recorder main body 101 . In this way, the lens built into the video recorder main body 101 can be protected from damage and dust.

In addition, when shooting with a video recorder, as shown in FIG. Alternatively, as shown in FIG. 35 , the protrusion 107 a of the holding protrusion 107 is inserted into the hole 105 a of the lens cap 105 to hold the lens cap 105 in the handle of the main body. In this way, the lens cap 105 can be prevented from being dropped or lost.

Patent Document 1: Japanese Unexamined Patent Publication No. H11-109441

Patent Document 2: JP-A-2002-72289

Patent Document 3: Utility Model Registration No. 2535068

However, the above conventional structure has the following problems.

(1) As shown in FIG. 32 , since the lens cap 105 is attached to the front surface of the lens hood 104 , the size of the video recorder body 101 becomes large and the portability decreases. In particular, the length in the optical axis direction of the lens becomes longer.

(2) As shown in FIG. 34, when the lens cap 105 is attached to the video recorder main body 101, only the pair of engagement claws 105b provided on the rear side of the lens cap 105 are engaged with the inner peripheral groove 104a of the lens hood 104. Therefore, there is a possibility that the lens cap 105 may be easily detached from the video recorder main body 101 due to the shock generated when the video recorder main body 101 is dropped or the like. If the lens cover 105 is detached, the surface of the lens unit 108 is damaged or dust is attached.

(3) When shooting, as shown in FIG. 34 , when the lens cap 105 is hung down from the video recorder main body 101 by the lens cap string 106 , since the lens cap 105 can move freely, it may hinder shooting.

(4) During shooting, when the lens cap 105 is mounted on the holding protrusion 107 as shown in FIG.

(5) As shown in FIG. 35 , when the lens cover 105 is mounted on the holding protrusion 107 and fixed to the handle of the main body and then photographed, due to weak fitting between the hole 105 a and the protrusion 107 a or an impact applied from the outside, etc., the lens cover 105 may be detached from the holding protrusion 107, and the state shown in FIG. 34 may be obtained. If it becomes the state shown in FIG. 34 during shooting, the lens cap 105 shaken by the lens cap cord 106 may hit the video recorder main body 101, and the impact sound at the time of collision may be recorded.

(6) In the state where the video recorder body 101 is facing the photographing object (subject), the position of the holding protrusion 107 is in a blind spot, and it is difficult to attach the lens cap 105 to the main body handle. In this way, it takes time to detach the lens cap 105 from the state shown in FIG. 33 to the state where photography can be performed as shown in FIG. 35 . That is, when the photographer holds the video recorder main body 101 in his hand and makes the lens point towards the subject side (that is, during normal photography), the protrusion 107a of the holding protrusion 107 is positioned at the subject side, and cannot be viewed from the subject side. The photographer's side opposite to the side is easy to visually view the protrusion 107 a of the holding protrusion 107 . Even if the lens cap 105 is to be attached to the holding protrusion 107 in this state, the protrusion 107a cannot be easily inserted into the hole 105a.

Contents of the invention

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a lens hood device capable of improving operability without increasing the size of the imaging device. In addition, an imaging device in which the lens hood device is detachable is provided.

In order to solve the above-mentioned problems, it is installed at the front end of the lens barrel mechanism, and has an opening. The lens barrel mechanism has an objective lens for condensing the reflected light image of the subject. With the center of the optical axis as the central axis, it is characterized in that: a plurality of lens barriers slid freely rotatably between a position covering the entire surface of the opening and a position opening the opening; and an accommodating portion, The plurality of lens barriers are accommodated when the plurality of lens barriers are located at positions where the openings are opened.

In addition, the imaging device of the present invention has: a lens barrel mechanism with an objective lens for converging the reflected light image of the subject; storing the above-mentioned image signal converted by the above-mentioned imaging element in an information medium; the lens hood device is arranged at the front end of the above-mentioned lens barrel mechanism.

Invention effect

The lens hood device of the present invention can have the function of a lens cover without increasing the size by arranging the lens barrier capable of protecting the lens in a freely accommodated manner.

In addition, since the lens hood device is screwed onto the lens barrel of the imaging device, it is not easily detached from the lens barrel even if vibration and impact are applied. In addition, even if the camera device is accidentally dropped, the lens hood device is not easy to come off and can protect the lens.

In addition, since the lens barrier can be easily opened and closed, operability can be improved.

Description of drawings

1 is an overall perspective view of a video recorder housing a lens barrier unit according to Embodiment 1 of the present invention.

FIG. 2 is a diagram showing a state in which the lens barrier of Embodiment 1 is opened.

FIG. 3 is a diagram showing a closed state of the lens barrier according to Embodiment 1. FIG.

4 is a perspective view of a lens barrier unit according to Embodiment 1. FIG.

5 is an exploded perspective view showing the internal structure of the lens barrier unit according to Embodiment 1. FIG.

6 is an exploded perspective view showing the internal structure of the lens barrier unit according to Embodiment 1. FIG.

7 is an exploded perspective view showing the internal structure of the lens barrier unit according to Embodiment 1. FIG.

8 is an exploded perspective view showing the internal structure of the lens barrier unit according to Embodiment 1. FIG.

9 is an exploded perspective view showing the internal structure of the lens barrier unit according to Embodiment 1. FIG.

10 is an exploded perspective view showing the internal structure of the lens barrier unit according to Embodiment 1. FIG.

FIG. 11 is an exploded perspective view showing the configuration of a front unit having the shutter opening and closing mechanism according to Embodiment 1. FIG.

12 is an exploded perspective view showing the configuration of a front unit having the shutter opening and closing mechanism according to Embodiment 1. FIG.

13 is an exploded perspective view showing the configuration of a front unit having the shutter opening and closing mechanism according to Embodiment 1. FIG.

FIG. 14 is an exploded perspective view showing the configuration of a front unit having the shutter opening and closing mechanism according to Embodiment 1. FIG.

FIG. 15 is a front view of a lens barrier unit according to Embodiment 1. FIG.

Fig. 16 is a cross-sectional view of the video recorder body according to Embodiment 1 when a lens barrier unit is attached.

17 is a cross-sectional view when a conventional lens hood is attached to the main body of the video recorder according to Embodiment 1, and a conventional lens cap is further attached.

18 is a cross-sectional view of the video recorder according to Embodiment 1 when the lens barrier unit is removed from the main body.

19 is a cross-sectional view of the video recorder according to the first embodiment when the conventional lens hood and lens cap are removed.

20 is a perspective view showing a state of the lens barrier unit and the front unit when the lens barrier of Embodiment 1 is opened.

21 is a perspective view showing a state of the lens barrier unit and the front unit when the lens barrier of Embodiment 1 is closed.

22 is a perspective view showing a state where the lens barrier unit with the lens barrier opened is attached when the switch ring position of the front unit in Embodiment 1 is the closed position.

23 is a cross-sectional view showing the internal state from the state where the lens barrier unit with the lens barrier opened is removed to when the switch ring position of the front unit in Embodiment 1 is closed.

FIG. 24 is a plan view showing a state showing the operation of each member from the closed state to the open state of the lens barrier according to Embodiment 1. FIG.

FIG. 25 is a plan view of the rear surface showing the state showing the operation of each member from the closed state to the open state of the lens barrier according to Embodiment 1. FIG.

26 is a plan view showing the operation of each component from the opened state to the closed state of the lens barrier according to Embodiment 1. FIG.

FIG. 27 is a plan view of the back surface showing the operation of each component from the opened state to the closed state of the lens barrier according to Embodiment 1. FIG.

FIG. 28 is a perspective view showing the configuration of an imaging device in Embodiment 2. FIG.

FIG. 29 is an exploded perspective view of the periphery of the front cover in Embodiment 2. FIG.

FIG. 30 is a perspective view showing the configuration of another example of a rotation mechanism in Embodiment 2. FIG.

FIG. 31 is an exploded perspective view showing the configuration of another example of a rotation mechanism in Embodiment 2. FIG.

FIG. 32 is a perspective view showing the appearance of a conventional imaging device.

FIG. 33 is a perspective view showing the appearance of a conventional imaging device.

FIG. 34 is a perspective view showing the appearance of a conventional imaging device.

FIG. 35 is a perspective view showing the appearance of a conventional imaging device.

Explanation of reference signs

8 VCR main body

11 The first baffle shell

14, 15, 16, 17 baffle blades

18 second baffle shell

32 lens barrier unit

Detailed ways

Preferably, the storage portion in the lens hood of the present invention is composed of a first barrier case member and a second barrier case member. On the subject side, the second barrier case member is coupled to the first barrier case member, and has a groove penetrating through the second barrier case member around the central axis of the second barrier case member, A barrier opening and closing switch part is provided in the gap between the first barrier shell part and the second barrier shell part, and the barrier opening and closing switch part is provided with a claw part, and the claw part penetrates the groove part and is loosely connected to the groove part. In the groove portion, a barrier drive transmission member is provided on a surface side of the second barrier case member facing the first barrier case member, and the barrier drive transmission member has a concave portion for fitting the claw portion. The claw part penetrates the above-mentioned groove part.

In addition, the accommodating portion may be accommodated between a covering member covering the accommodating portion via the first baffle shell member and a detachable member fastened to the covering member, and the detachable member may be detachably connected. At the front end of the above lens barrel mechanism.

In addition, the first barrier case member and the second barrier case member have an opening with the center axis of the optical axis as a central axis, and the lens hood device has a shield member that is connected to the second barrier case member. The covering member is fixedly coupled and rotatably coupled, and the shielding member has a second opening having an opening area larger than the opening area formed by the opening.

In addition, in the image pickup device of the present invention, a rotating member may be provided at a connection portion between the lens hood device and the front end portion of the lens barrel mechanism included in the lens hood device, and the rotating member may be configured to be the same as that of the lens barrel mechanism. The center of the optical axis of the objective lens is a central axis, and the claw portion is moved along the shape of the groove portion, and the claw portion protrudes from the groove portion penetrating the second barrier case member around the central axis.

In addition, it may be configured to further include a driving mechanism that applies a moving force of the claw portion along the shape of the groove portion, and an instructing mechanism that instructs the driving mechanism to start applying the moving force.

(Embodiment 1)

FIG. 1 is a perspective view showing the configuration of an imaging device housing a lens barrier unit according to Embodiment 1 of the present invention. 2( a ) and FIG. 2( b ) are a front view and a main part perspective view showing a state in which the lens barrier of the imaging device is opened. 3( a ) and FIG. 3( b ) are a front view and a main part perspective view showing a state where the lens barrier is closed. 4(a) and 4(b) are perspective views of the lens barrier unit. 5 to 10 are exploded perspective views and front views showing the structure of the lens barrier unit. 11 to 14 are exploded perspective views showing the structure of the front unit having a shutter opening and closing mechanism.

As shown in FIG. 1 , the camera body 8 incorporates an imaging element (CCD image sensor, etc.) that converts incident light signals into electrical signals, that is, video signals, and an information storage medium that records the video signals generated by the imaging element. Information storage media are composed of video tapes, optical discs, and the like. In addition, when video is recorded on an information storage medium, audio signals are recorded together with video signals. In addition, the camera body 8 is a type of imaging device. In addition, in this embodiment, a video camera has been described as an example, but it is preferable to have a lens hood having at least optical components such as a lens and protective components such as a lens cap for protecting the lens, and a lens hood with a built-in lens and a detachable lens hood. The lens barrel, in addition to video cameras, can also be digital cameras and silver salt cameras. In the case of a silver halide camera, it does not have a structure such as a CCD image sensor that uses photoelectric conversion to generate an image signal, but generally includes an optical signal that allows the film mounted in the silver halide camera to be exposed to the subject in the imaging unit. Structure.

Next, the structures of the barrier switch ring 9, the barrier cam ring 10 and the first barrier shell 11 will be described with reference to FIG.

The shutter opening and closing ring 9 (the shutter opening and closing switching part) is combined with the shutter driving ring 22 built in the front unit 33 . Furthermore, the torque of the barrier drive ring 22 is transmitted to the barrier cam ring 10 . In addition, the shutter switch ring 9 is configured to be rotatable by a certain amount in the direction of arrow A or B in FIG. 6 along the guide rail 11 c of the first shutter case 11 . In addition, the first and second baffle ring springs 12, 13 (Fig. 7) are used to connect the front part of the baffle shell and the baffle switch ring 9, and are forced to push in the direction of closing the lens baffle by the force of the spring (arrow B in Fig. 6). direction).

Protrusions 9 a and 9 b (claws) are erected on the shutter switch ring 9 , and are engaged with protrusions 22 d and 22 c of the shutter driving ring 22 . The upper surfaces of the protrusions 9a and 9b are sloped, and when the shutter switch ring 9 and the shutter drive ring 22 are mounted in a phase-shifted state in the rotational direction, the rotary switch ring 9 is guided in a sloped shape. Install it by rotating it to the same phase as the barrier drive ring 22.

The protruding part 9c is arranged on the back side of the damper switch ring 9 and combines with the groove 10c of the damper cam ring 10 to transmit the torque of the damper switch ring 9 to the damper cam ring 10 .

The protruding portion 9 d is a part of the flapper switch ring 9 that is hook-shaped, and can hook the first flapper ring spring 12 shown in FIG. 7 . The other end of the first baffle ring spring 12 is hooked on the protrusion 11 k of the first baffle shell 11 , and the spring force is used to apply rotational potential energy to the baffle switch ring 9 .

The protrusion part 9e is formed in a part of the barrier switch ring 9, and can hook the 2nd barrier switch spring 13 as shown in FIG. Further, the other end of the second barrier switch spring 13 is hooked on the protrusion 10 d of the barrier cam ring 10 , and rotational potential energy is applied to the barrier cam ring 10 by the spring force of the second barrier switch spring 13 .

The reinforcing ribs 9f and 9g are part of the baffle switch ring 9, and are arranged on the lower part of the main surface of the baffle switch ring 9. In addition, ribs 9f and 9g, as shown by arrow a in FIG. 5 , are freely slidably combined with the underside of umbrella-shaped ribs 11g and 11h of the first apron shell 11, preventing the apron switch ring 9 and the apron from opening and closing. The plate cam ring 10 is detached from the first barrier shell 11 .

The baffle cam ring 10 transmits the rotational motion of the baffle switch ring 9 to the first to fourth baffle blades 14 to 17 by using a cam mechanism. Furthermore, the shutter cam ring 10 is held together with the shutter switch ring 9 on the first shutter shell 11 .

Ribs 10 a and 10 b are provided on the fender cam ring 10 . The ribs 10a and 10b are combined with the protruding shafts 14a and 15a of the third barrier blade 14 and the fourth barrier blade 15, and the third and fourth barrier blades 14 and 15 are operated by cam motion.

The groove portion 10 c is provided on the barrier cam ring 10 , and is combined with the protrusion 9 c of the barrier switch ring 9 to transmit the rotation of the barrier switch ring 9 to the barrier cam ring 10 .

The protrusion 10 d is formed in a hook shape and is provided on a part of the barrier cam ring 10 . In addition, the protrusion 10d can hook the other end of the second barrier switch spring 13 (described later). One end of the second barrier switch spring 13 is hooked on the protruding portion 9e of the barrier switch ring 9 to apply rotational potential energy to the barrier cam ring 10 by spring force.

The groove portion 10 e is provided on the barrier cam ring 10 . In addition, the groove portion 10e has a size that escapes from the protrusion at the front of the apron case when the apron is opened and closed, but is not rotated by a certain amount or more due to the protrusion 11f of the first apron case 11 . This is for preventing the assembly from being difficult because the barrier cam ring 10 is rotated more than a certain amount by the spring force of the barrier ring springs 12 and 13 when the barrier unit is assembled.

The first barrier case 11 is a part of the peripheral frame of the lens barrier unit 32 .

The protrusions 11a and 11b are pin-shaped members provided on the first barrier shell 11, and are inserted through the holes 14b and 15b of the third barrier blade 14 and the fourth barrier blade 15, and the first barrier blade 14b respectively. The barrier blades 14 to 17 are rotatably supported in the hole portions 16 a and 17 a of the second barrier blade 16 and the second barrier blade 17 . That is, the protrusions 11 a and 11 b are the rotation shafts of the barrier blades 14 to 17 .

Ribs 11c and 11d are provided along the periphery of the opening 11e of the first barrier case 11 to guide when the barrier switch ring 9 and the barrier cam ring 10 slide.

The opening 11e is provided in the first barrier case 11, and passes an optical signal incident from the outside. The size of the opening 11e is set to a shape and size that can accommodate the barrier blades 14 to 17 around the opening 11e and that does not cause ghosting (ghosting is not generated in the video signal) when light incident on the lens. .

The protrusion 11f is provided on the front portion of the fender case, and engages with the groove 10e to prevent the fender cam ring 10 from rotating more than a certain amount.

The reinforcing ribs 11g and 11h are umbrella-shaped parts provided near the opening 11e of the first barrier shell 11, and are combined with the reinforcing ribs 9f and 9g of the barrier switch ring 9 to prevent the barrier cam ring 10 and the barrier switch from sliding. The ring 9 is detached from the first baffle shell 11 .

The protrusions 11i and 11j are provided on the outer peripheral surface of the first apron case 11, and are fitted with protrusions 18d and 18e provided on the outer peripheral surface of the second apron case 18 (described later). Further, the protrusions 11 i and 11 j temporarily fix the first barrier shell 11 and the second barrier shell 18 when the barrier shell unit 31 is inserted into the shade shield 20 as shown in FIG. 10 .

A protrusion 11 k is provided on the first barrier housing 11 holding an end of the first barrier ring spring 12 . The other end of the first flapper ring spring 12 is held on the protrusion 9d of the flapper switch ring 9 to apply rotational potential energy to the flapper switch ring 9 by the force of the spring.

As shown in FIG. 7 , the first flap ring spring 12 is composed of elastic members such as coil springs, for example. In addition, the first barrier ring spring 12 has circular portions at both ends, as shown by arrow b in FIG. On the protrusion 9d of the shutter switch ring 9. This joins the first flap housing 11 and the flap switch ring 9 . Further, the first barrier ring spring 12 always applies a load (potential energy) to the barrier switch ring 9 in a direction in which the barrier blades 14 to 17 are opened, that is, clockwise when the lens barrier unit 32 is viewed from the rear.

Hereinafter, when describing the rotation direction of the barrier ring and the barrier blades, it is assumed that the lens barrier 32 is viewed from the rear side (that is, the surface on the side of the video recorder main body 8 when mounted on the video recorder main body 8 ).

As shown in FIG. 7 , the second shutter switch spring 13 is formed of an elastic member such as a coil spring, for example. In addition, the second barrier switch spring 13 has circular portions at both ends, as shown by arrow b in FIG. On the protrusion 9e of the plate switch ring 9. This links the flapper cam ring 10 and the flapper switch ring 9 . In addition, the second barrier switch spring 13 transmits the counterclockwise torque of the barrier switch ring 9 to the barrier cam ring 10 and the barrier switch ring 9 through the second barrier switch spring 13 . In addition, since the barrier cam ring 10 and the barrier switch ring 9 are connected by springs, when an external force other than the barrier switch ring 9 is applied to the barrier cam ring 10 (moving the closed barrier blades 14 with an external force) to 17 o'clock, etc.), the flapper cam ring 10 can be rotated in the direction opposite to that of the flapper switch ring 9 .

As shown in FIG. 8 , the barrier blades 14 to 17 are arranged at approximately the center of the optical axis of the lens barrier unit 32 so as to be openable and closable, and are composed of four blades in this embodiment, but the number of blades is not limited thereto. In addition, the barrier blades 14 to 17 move in a direction substantially perpendicular to the optical axis during the opening and closing operation. The structure of each blade will be described below.

As shown in FIG. 8 , the third baffle blade 14 is one of the four baffle blades, which is opened and closed in conjunction with the rotation of the baffle cam ring 10 . In addition, the opening and closing motion of the third barrier blade 14 can be transmitted to the first barrier blade 16 by using the rib 14f. In addition, the third barrier vane 14 is mounted on the barrier shell unit 31a as indicated by arrow C. As shown in FIG.

The protrusion 14 a is a pin-shaped member provided on the surface side (side opposite to the first barrier blade 16 ) of the third barrier blade 14 . In addition, the protrusion 14a is coupled to the rib 10a of the barrier cam ring 10 to open and close the third barrier blade 14 when the barrier cam ring 10 rotates and cams around the hole 14b as a fulcrum.

The hole portion 14 b is provided in the third barrier blade 14 , and the pin-shaped protrusion 11 a coupled with the first barrier shell 11 is inserted therethrough so that the third barrier blade 14 can freely rotate.

The outer peripheral portion 14c is a part of the outer periphery of the third baffle blade 14 , and the connecting rib 16d of the first baffle blade 16 is brought into contact with or joined to the outer peripheral portion 14c to transmit clockwise rotation to the first baffle blade 16 . Moment (the force with which the blade opens).

The rib 14d is provided on the back side of the third barrier blade 14 (the side not opposite to the first barrier blade 16). In the state where the lens barrier unit 32 is attached to the video recorder main body 8 and the barrier blades 14 to 17 are closed, when an excessive force is applied to the barrier blades 14 to 17 from the front, the front end of the rib 14d touches the lens surface. , to prevent the baffle blades 14-17 from being significantly deformed. However, the lens barrier is originally a member for preventing the lens from being damaged. Usually, the rib 14d does not touch the lens surface during use, and only when force is applied to the barrier blades 14-17, the front end of the rib 14d touches the lens. noodle. Furthermore, it is preferable to reduce the contact area between the front end of the rib 14d and the lens surface, so that the lens surface will not be damaged when the front end of the rib 14d contacts the lens surface; and surface treatment is performed to reduce surface roughness.

A rib 14 e is provided along an edge portion of the third barrier blade 14 opposite to the fourth barrier blade 15 . In addition, the height of the main plane of the rib 14 e is configured to be lower than the main plane on the back side of the third barrier blade 14 . In this way, when the baffle blades 14 to 17 are closed, the reinforcing rib 14e and the reinforcing rib 15e overlap and contact each other, thereby improving the light-shielding property.

A rib 14f protrudes from the surface of the third barrier blade 14, and when the lens barrier is closed, it abuts against the outer peripheral portion 16b of the first barrier blade 16 to transmit the counterclockwise direction to the first barrier blade 16. The torque (the force of the blade closing).

As shown in FIG. 8 , the fourth barrier blade 15 is one of the four barrier blades 14 to 17 , and is opened and closed by the rotation of the barrier cam ring 10 . In addition, the opening and closing movement of the fourth barrier blade 15 is transmitted to the second barrier blade 17 by using the rib. In addition, the fourth barrier vane 15 is mounted on the barrier shell unit 31a as indicated by arrow C. As shown in FIG.

The protrusion 15 a is a pin-shaped member provided on the surface side of the fourth barrier blade 15 (the side opposite to the second barrier blade 17 ). In addition, the protrusion 15a is coupled to the rib 10b of the barrier cam ring 10, and when the barrier cam ring 10 is rotated, the fourth barrier blade 15 is opened and closed by camming the hole 15b as a fulcrum. Furthermore, the fourth barrier blade 14 performs rotational movement around the protrusion 11b as an axis.

The hole portion 15 b is provided in the fourth barrier blade 15 , and the pin-shaped protrusion 11 b coupled with the first barrier shell 11 is inserted so that the fourth barrier blade 15 can freely rotate.

The outer peripheral portion 15c is a part of the outer periphery of the fourth baffle blade 15, and when the fourth baffle blade 15 is turned in the opening direction, the outer peripheral portion 15c touches the rib 17c of the second baffle blade 17, and moves toward the second baffle blade 17. 17 transmits the clockwise torque (force to open the blades).

The rib 15d is protrudingly provided on the back side of the fourth barrier blade 15 (the side not opposing the second barrier blade 17). By installing the lens barrier unit 32 on the video recorder main body 8, when the barrier blades 14-17 are closed, when the barrier blades 14-17 are pressed from the front, the front end of the rib 15d touches the surface of the lens, preventing the barrier from being blocked. The plate blades 14-17 are significantly deformed. In addition, usually, the rib 15d is arranged so that it does not touch the lens surface during use, and only when the barrier blades 14 to 17 are pressed from the front, the front end of the rib 15d touches the lens surface.

A rib 15 e is provided along an edge of the fourth barrier blade 15 opposite to the third barrier blade 14 . In addition, the height of the main plane of the rib 15 e is configured to be lower than the main plane of the surface side of the fourth baffle blade 15 . In this way, when the barrier blades 14 to 17 are closed, the rib 15e overlaps with the rib 14e, so that the light-shielding property can be improved.

A rib 15f is provided on the surface of the fourth baffle blade 15, and by making the rib 15f touch the outer peripheral portion 17b of the second baffle blade 17, a torque in the counterclockwise direction is transmitted to the second baffle blade 17 (blade closing force).

As shown in FIG. 8 , the first baffle blade 16 is one of the four baffle blades 14 - 17 , and can use the ribs of the third baffle blade 14 to perform the rotational movement of opening and closing. In addition, the first barrier blade 16 performs a rotational movement of opening and closing around the protrusion 11a as an axis. In addition, the first barrier vane 16 is mounted on the barrier shell unit 31a as indicated by arrow D. As shown in FIG.

The hole portion 16 a is provided in the first barrier blade 16 , and the pin-shaped protrusion 11 a coupled with the first barrier shell 11 is inserted therethrough.

The outer peripheral portion 16b is a part of the outer periphery of the first barrier blade 16, and the rib 14f of the third barrier blade 14 touches the outer peripheral portion 16b, and transmits counterclockwise torque (blade closing force) to the first barrier blade 16 .

The reinforcing rib 16c is arranged on the back side of the first baffle blade 16 (the surface opposite to the third baffle blade 14), and the outer peripheral surface 14c of the third baffle blade 14 touches the reinforcing rib 16c, and transmits to the first baffle blade 16. Torque in the clockwise direction (the force with which the blades open).

As shown in FIG. 8 , the second baffle blade 17 is one of the four baffle blades 14 - 17 , and can use the ribs of the fourth baffle blade 15 to perform the rotational movement of opening and closing. In addition, the second barrier blade 17 performs a rotational movement of opening and closing around the protrusion 11b as an axis. In addition, the second barrier vane 17 is mounted on the barrier shell unit 31a as indicated by arrow D. As shown in FIG.

The hole portion 17 a is provided in the second barrier vane 17 , and the pin-shaped protrusion 11 b of the first barrier shell 11 is inserted therethrough.

The outer peripheral portion 17b is a part of the outer periphery of the second baffle blade 17, and the rib 15f of the fourth baffle blade 15 touches the outer peripheral portion 17b to transmit counterclockwise torque (blade closing force) to the second baffle blade 17. .

The reinforcing rib 17c is arranged on the back side of the second baffle blade 17 (the surface opposite to the fourth baffle blade 15), and the outer peripheral surface 15c of the fourth baffle blade 15 touches the reinforcing rib 17c, from the fourth baffle blade 15 to the The second flapper vane 17 transmits a clockwise torque (vane opening force).

As shown in FIG. 9 , the second barrier case 18 is a part of the peripheral frame of the lens barrier unit 32 . In addition, the second apron case 18 is temporarily fixed to the first apron case 11 to constitute the apron case unit 31a.

Two openings 18 a (grooves) are provided in the second baffle case 18 . In addition, the protrusions 9 a and 9 b of the damper switch ring 9 are built into the opening 18 a. In addition, the projections 9 a and 9 b are configured to be movable within the opening range of the opening 18 a in accordance with the turning operation of the shutter switch ring 9 .

The opening portion 18 b is a portion through which incident light passes in the second barrier case 18 . The size of the opening 18b is set so that the light entering the lens does not generate ghost images. In addition, the size of the opening 18b is set to a size capable of accommodating the barrier blades 14 to 17 in the vicinity of the opening 18b. That is, if the opening 18b is too small, the incident light will produce virtual shadows. Conversely, if the opening 18b is too large, there will be no space for housing the baffle blades 14 to 17 around the opening 18b. Thus, it is necessary to optimize the size of the opening 18b.

The protrusion 18 c is provided on the back side of the second fender case 18 and is coupled to the coupling hole 28 c of the front frame 28 . As shown in FIG. 14 , when the lens barrier unit 32 is attached to the video recorder main body 8 , the barrier case unit 32 can be positioned by inserting and coupling the protrusion 18 c into the coupling hole 28 c of the front frame 28 .

The protrusions 18d and 18e are provided on the outer periphery of the second baffle shell 18, and as shown by the arrow E, are fitted with the protrusions 11i and 11j of the first baffle shell 11 to temporarily fix the first baffle shell 11 and the second baffle shell. Plate shell 18.

Claw portions 18 f are provided at four positions of the second barrier case 18 . Furthermore, as shown in FIG. 10 , by hooking the front end of the claw portion 18 f in the hole portion 20 b of the hood shield 20 , the baffle case unit 31 and the hood shield 20 are integrated.

As shown in FIGS. 8 and 9 , the barrier housing unit 31 houses the barrier blades 14 to 17 , the barrier cam ring 10 , the barrier switch ring 9 , and the first and second barrier ring springs 12 and 13 . Also, the barrier case unit 31a shows the barrier case unit 31 in a state (first assembled state) in which the barrier switch ring 9, the barrier cam ring 10, and the first barrier shell 11 have been assembled. In addition, the barrier case unit 31 b shows the barrier case unit 31 in a state (second assembled state) in which the first to fourth barrier blades 14 to 17 are assembled in the barrier case unit 31 a. The state in which the second apron case 18 is assembled in the apron case unit 31 b is the apron case unit 31 in a completed state. In addition, the barrier shell unit 31 has accommodating portions capable of housing the barrier blades 14 to 17 when the barrier blades 14 to 17 are in an open state.

As shown in FIG. 10 , the hood screw 19 is rotatably fitted to the outer peripheral surface of the coupling wall 20 d of the hood shield 20 , and since it is fitted with the hood cover 21 , it is integrated with the hood cover 21 on the hood. Shield 20 on rotation. In addition, a screw portion 19 c with an external thread is formed around the hood screw 19 , and by rotating the hood cover 21 , the lens barrier unit 32 can be screwed into the video recorder body 8 without rotating the barrier case unit 31 .

The shade cover fitting portion 19 a is provided on the shade screw 19 and is formed in a concave shape, and is fitted and fixed to the rib 21 a of the shade cover 21 as indicated by an arrow F. In this embodiment, the sunshade cover fitting portion 19a and the reinforcing rib 21a are respectively provided at four positions.

The inner peripheral surface 19b corresponds to the rear side of the screw portion 19c of the shade screw 19 .

The screw part 19c is formed on the outer peripheral surface of the cylindrical part of the shade screw 19, and consists of external threads. In addition, the lens barrier unit 32 can be fixed to the video recorder main body 8 by screwing the screw portion 19 c with the female thread 28 d provided on the front frame 28 of the video recorder main body 8 .

As shown in FIG. 10 , the hood shield 20 (shielding member) cuts scattered light and prevents stray light in video signals by providing openings 20c and ribs 20e (see FIG. 4 ). Furthermore, a baffle case unit 31 is accommodated inside the hood shield 20 . In addition, a hood screw 19 is rotatably arranged on the outer periphery of the hood shield 20 .

The reinforcing rib 20 a protrudes from the outer peripheral surface of the coupling wall 20 d of the shade shield 20 . In addition, in this embodiment, the reinforcement rib 20a is provided in four places, and it arrange|positions so that it can slide with respect to the inner peripheral surface 19b of the shade screw 19. As shown in FIG.

The hole portion 20b is provided on the coupling wall 20d of the shade shield 20 . The baffle case unit 31 and the hood shield 20 are integrated by moving the claw portions 18 f provided at four positions of the second baffle case 18 as indicated by arrow G to be coupled to the hole portions 20 b at four positions.

The opening 20 c (second opening) is formed substantially in the center of the hood shield 20 . In addition, the size and shape of the opening 20c are set so that light incident on the lens does not cause ghost images, and scattered light does not enter. In addition, in this embodiment, although the opening part 20c is set as a substantially ellipse, it may be an ellipse or a rectangle.

The coupling wall 20d is formed of a substantially cylindrical member that is erected on the main surface of the hood shield 20 and partially cut away. In addition, a shade screw 19 is slidably and rotatably coupled to the outer peripheral side of the coupling wall spacer 41820d.

As shown in FIG. 10 , the hood cover 21 is disposed on a part of the outer frame of the lens barrier unit 32 as a covering member, and is fitted integrally with the hood screw 19 . In this embodiment, the hood cover 21 is located at the outermost portion of the lens barrier unit 32 in the circumferential direction, and is a portion that is rotated when the user screws the lens barrier unit 32 to the video recorder body 8 . In addition, the shading cover 21 may be provided with irregularities in the circumferential direction at a portion held by the user's fingers when attached to the video recorder body 8 so that the shading cover 21 can be easily rotated.

Ribs 21 a are provided at four positions on the inner four sides of the shade cover 21 , and the shade screws 19 and the shade cover 21 are integrated by fitting the fitting portions 19 a of the shade screws 19 .

As shown in FIG. 11 , a barrier drive ring 22 (a barrier drive transmission member) is fitted into an annular cover 23 . In this way, the barrier drive ring 22 is rotated by rotating the ring cover 23 . By rotating the barrier drive ring 22 , the barrier switch ring 9 of the lens barrier unit 32 rotates in conjunction with each other, so that the barrier blades 14 to 17 can be opened and closed. In addition, there is a click mechanism to determine the opening and closing positions of the baffle blades 14-17.

The protrusion part 22a is provided in the inner periphery of the barrier drive ring 22, and has the shape of a triangular recess. The apex of the triangular portion of the barrier ring plate spring 24 (see FIG. 12, described later) sinks into the concave portion of the protrusion 22a, so that the barrier driving ring 22 produces a click feeling.

Protrusions 22 b are provided at four positions on the outer four sides of the barrier driving ring 22 , and are moved as shown by arrow H to fit with four ribs 23 a of the annular cover 23 . In this way, the annular cover 23 is fixed on the barrier driving ring 22 .

Protrusions 22 c and 22 d are provided on the inner periphery of the barrier driving ring 22 . In addition, the protrusions 22c and 22d respectively have recesses for fitting the protrusions 9a and 9b of the shutter switch ring 9, and by fitting the protrusions 9a, 9b and the recesses, the torque of the shutter driving ring 22 can be transmitted to the shutter. Switch ring 9.

The inner peripheral surface 22 e is the inner peripheral surface of the barrier drive ring 22 , and slides against four ribs provided on the outer periphery of the front frame 28 .

As shown in FIG. 11 , the annular cover 23 (rotational member) is a part of the peripheral frame of the front unit 33 , and is integrally fitted with the barrier drive ring 22 . In addition, the annular cover 23 is arranged so as to be rotatable in the circumferential direction around the optical axis. In the state where the lens barrier unit 32 is attached to the video recorder main body 8, the barrier blades 14 to 17 can be opened and closed by rotating the annular cover 23 by a predetermined angle with a user's fingers or the like.

Ribs 23 a are provided at four positions on the inner circumference of the annular cover 23 , and are fitted with ribs 22 b provided at four positions on the outer circumference of the barrier drive ring 22 , so that the annular cover 23 is fixed on the barrier drive ring 22 .

As shown in FIG. 12 , the shutter annular leaf spring 24 is formed by bending an elastic thin plate-shaped spring, and both ends are fixed to grooves 26 a of the front case 26 as indicated by an arrow K. In addition, as indicated by arrow J, the protrusion 22 a of the barrier driving ring 22 is arranged in contact with the barrier ring plate spring 24 . In addition, the barrier drive ring 22 produces a click feeling by sinking the top of the triangular portion of the barrier ring plate spring 24 into the recessed portion in the protrusion 22 a of the barrier drive ring 22 . Utilizing this click feeling, the shutter driving ring 22 is restricted to stop at one of the "open" position shown in FIG. 2(b) or the "close" position shown in FIG. 3(b). .

As shown in FIG. 12, the lens cover 25 is a part of the peripheral frame of the front unit 33, and as shown by arrow L, after being integrated with the front case 26, as shown by arrow I, it is sandwiched between the front case 26 and the front frame 28. Come and fix. In addition, the lens cover 25 is an example of a lens barrel mechanism.

As shown in FIG. 12 , the front case 26 is a part of the peripheral frame of the front unit 33 . In the front housing 26, a lens cover 25, a barrier drive ring 22, and a ring cover 23 are fixedly mounted at positions substantially coaxial with the optical axis of the lens.

As shown in FIG. 13, the lens damper 27 is fixed to the front frame 28, and relaxes the impact applied to the lens lens of the lens unit on the inner peripheral portion. In addition, in this embodiment, the lens damper 27 is made of rubber, but it may be made of other members as long as it can absorb impact.

As shown in FIG. 13 , the front frame 28 is a part of the peripheral frame of the front unit 33 . The front frame 28 is attached to the front of the front case 26 and holds the barrier drive ring 22 rotatably on the outer peripheral portion. In addition, a lens damper 27 is attached to the center of the front frame 28 , and the lens damper 27 is clamped and fixed between the front frame 28 and the front case 26 .

The ribs 28b are ribs provided at two positions on the rear surface of the front frame 28, and abut against the side surfaces of the protrusions 22c and 22d provided on the inner circumference of the barrier drive ring 22 during rotation to restrict the drive of the barrier. The amount of rotation of the ring 22.

The coupling hole 28c is provided on the back of the front frame 28, and forms a rib surrounding the periphery. In addition, when the lens barrier unit 32 is assembled, the protrusion 18c (see FIG. 9 ) of the second barrier case 18 is inserted into the joint hole 28c, and the barrier case unit 31 can be positioned so that the barrier case unit 31 does not rotate.

When the lens barrier unit 32 is attached to the video recorder main body 8 , the female thread portion 28 d is screwed to the external thread portion 29 c of the hood screw 19 .

Holes 28 e are provided at two positions penetrating the front and back of the front frame 28 , and are connected to the protrusions 22 c and 22 d of the shutter drive ring 22 and the protrusions 9 a and 9 b of the shutter switch ring 9 .

As shown in FIG. 13 , the screws 30 are, for example, M16 screws, and fix the front frame 28 to the front case 26 as indicated by an arrow M. As shown in FIG.

As shown in FIG. 13 , the front unit 33 has the barrier driving ring 22 , and the barrier blades 14 to 17 can be opened and closed by attaching the lens barrier unit 32 to the front frame 28 .

As shown in FIG. 14 , the lens barrier unit 32 can be detached from the front frame 28 . Furthermore, as shown in FIG. 10 , the lens barrier unit 32 is formed by fitting the barrier case unit 31 and the hood shield 20 integrally, and attaching the hood screw 19 and the hood cover 21 .

With regard to the lens hood device and imaging device configured as described above, the following operation will be described.

First, the operation when attaching and detaching the lens barrier unit 32 to the video recorder main body 8 will be described.

Fig. 15 is a front view of the lens barrier unit. Fig. 16 is a cross-sectional view when the lens barrier unit is attached to the main body of the video recorder, and is a cross-section taken along the line i-i in Fig. 15 . Fig. 17 is a cross-sectional view when a conventional lens hood is attached to a video recorder body, and a conventional lens cap is further attached. Fig. 18 is a sectional view when the lens barrier unit is removed from the main body of the video recorder.

In FIGS. 14 and 18 , the lens barrier unit 32 is moved toward the front frame 28, which constitutes a part of the frame of the front portion (the surface facing the subject side during shooting) of the video recorder main body 8, as shown by the arrow N in the figure. , installed so that the optical axis of the lens barrier unit 32 substantially coincides with the optical axis of the front frame 28 . At this time, the protruding portion 18 c protruding from the back side of the lens barrier unit 32 is inserted into the engaging hole 28 c provided on the front frame 28 as indicated by an arrow P. As shown in FIG. In this way, the lens barrier unit 32 is positioned, and the two projections 9 a and 9 b protruding from the lens barrier unit 32 are fitted into the hole 28 e of the front frame 28 as indicated by the arrow Q.

Next, by rotating the hood cover 21 of the lens barrier unit 32 in the arrow R direction, the screw portion 19c provided on the back side of the lens barrier unit 32 can be screwed to the external thread 28d of the front frame 28 . Figure 15 and Figure 16 are the screwed state.

Furthermore, by rotating the hood cover 21, the hood screw 19 of the lens barrier unit 32 is rotated, but the barrier case unit 31 and the hood shield 20 are not rotated. That is, the hood shield 20 that functions as a lens hood has an approximately elliptical opening 20c, and the opening provided near the optical axis of the lens barrier unit 32 is also formed in an approximately elliptical shape. In this way, when the lens barrier unit 32 is screwed to the front frame 28, if the position of the substantially elliptical opening in the rotation direction is not the correct position, it will not function as a lens hood. In the present embodiment, the position of the hood shield 20 in the rotation direction can be maintained when the lens barrier unit 32 is screwed together.

As shown in FIG. 15 , when viewed from the front side of the lens barrier unit 32 , the upper and lower sides of the lens lens 29 are blocked by the hood shield 20 of the lens barrier unit 32 to limit the amount of light. In addition, when viewed from the side as shown in FIG. 16 , the thickness in the optical axis direction can be made thinner than the conventional structure shown in FIG. 17 . This is because, in the existing structure shown in Fig. 17, lens hood 4 is installed on the front portion of front frame 28, and lens cover 5 is installed on the front portion of lens hood 4, necessarily just must have lens. The thickness of the cover 5 and the lens hood 4. On the other hand, in this embodiment, since the lens barrier unit 32 having the same thickness as the conventional lens cap 5 has the structure of both the lens cap and the lens hood, it is possible to reduce the dimension in the thickness direction. .

In addition, in order to easily understand each unit in this embodiment and the existing structure, FIG. 18 shows the state where each unit is separated in the structure of this embodiment, and FIG. 19 shows that each unit is separated in the conventional structure. The state of the unit. In Fig. 18 and Fig. 19, the units are moved as indicated by arrows N, T, and U respectively to be mounted to each other.

Next, when detaching the lens barrier unit 32 from the video recorder main body 8, from the state shown in FIGS. The screw portion 19c on the back side of the lens barrier unit 32 is screwed to the external thread portion 28d of the front frame 28 . If the screwed state is completely released, then by moving the lens barrier unit 32 in the direction opposite to the arrow N, the protrusion 18c protruding from the rear side of the lens barrier unit 32 and the protrusion 18c provided on the front frame 28 can be respectively released. The coupling state of the coupling hole 28c and the coupling state of the two projections 9a, 9b protruding from the lens barrier unit 32 and the hole 28e of the front frame 28 allow the lens barrier unit 32 to be detached from the front frame 28 .

Next, the opening and closing operation of the lens barrier will be described.

As shown in FIG. 1 , in the state where the lens barrier unit 32 is attached to the video recorder main body 8 , the annular cover 23 can be rotated by a predetermined rotation angle.

In addition, as shown in FIG. 2(b) and FIG. 3(b), there are an indicator 90 provided on the annular cover 23, a closed mark 91 for visually notifying the user that the lens barrier has been closed, and a The opening mark 92 visually informs the user that the lens barrier is opened. In addition, although the close mark 91 is shown graphically, it is not limited to this. In addition, although the open sign 92 is an English sign which consists of "OPEN", it is not limited to this.

In FIGS. 2 and 3 , by rotating the annular cover 23 in the circumferential direction, the relative position of the indicator 90 relative to the closing mark 91 or the opening mark 92 is changed. That is, as shown in FIG. 3( b ), the lens barrier can be closed as shown in FIG. 3( a ) by rotating the ring cover 23 so that the indicator 90 coincides with the closing mark 91 .

In addition, as shown in FIG. 2( b ), by rotating the ring cover 23 so that the indicator 90 coincides with the opening mark 92 , the lens barrier can be opened as shown in FIG. 2( a ). FIG. 2( a ) shows a state where the lens barrier is opened, and the lens lens 29 can be viewed from the front of the video recorder main body 8 . Note that the operation of the internal functions when the shutter blades 14 to 17 are opened and closed will be described later.

Next, the safety mechanism when the lens barrier unit is installed in the video recorder main body 8 will be described.

Figures 20 to 23 show the inner workings when the lens barrier unit is installed, and Figures 20 to 22(a) are disassembled units in order to easily understand the operation of the internal mechanisms of the lens barrier unit 32 and the front frame 28 In the perspective view shown above, each unit is separated in the illustration, but actually each part is combined or separated. (b) is a perspective view showing marks provided near the front frame 28 . 20 and 21, since the opening and closing state of the barrier blades of the lens barrier unit 32 is consistent with the opening and closing state of the barrier drive ring on the front frame 28 side, it can be disassembled based on the aforementioned detachment. 23(a) shows the state before the lens barrier unit 32 is attached to the video recorder main body 8, and FIG. Fig. 23(c) shows a state where the protrusion 9a is slid and combined with the protrusion 22c.

As shown in FIG. 22 , the barrier drive ring 22 is in a state where the indicator 90 is located at the position of the closing mark 91 (the phase is opposite to the barrier switch ring 9 ), and the lens is in the state where the barrier blades 14-17 are opened. When the barrier unit 32 is installed on the video recorder main body 8, if the lens barrier unit 32 (not shown) mounted with the barrier switch ring 9 etc. is moved from the unattached state shown in FIG. Moving, as shown in FIG. 23( b ), the protrusion 9 a ′ is inserted into the barrier drive ring 22 .

When the protrusion 9 a is inserted into the position shown in FIG. 23( b ), the slope 9 a ′ comes into contact with the protrusion 22 c of the barrier driving ring 22 . Also, when the lens barrier unit 32 is moved in the direction of the arrow d, the slope 9a' and the protrusion 22c slide to guide the protrusion 9a in the direction of the arrow e. By guiding the protrusion 9a in the direction of the arrow e, the damper switch ring 9 rotates in the circumferential direction. As the shutter switch ring 9 is rotated in the circumferential direction, the shutter blades 14-17 are closed.

Next, if the lens barrier unit 32 is further moved from the state shown in FIG. 23(b) to the direction of arrow d, the projection 9a is further guided in the direction of arrow e, and as shown in FIG. 22 Chimeric. The barrier blades 14 to 17 are completely closed, and the lens barrier unit 32 is attached to the video recorder main body 8 .

Furthermore, the shutter blades 14-17 are pushed in the direction of always opening by the first shutter ring spring 12, and the shutter blades 14-17 are always opened in the state where the lens barrier unit 32 is not attached to the video recorder main body 8. with.

Next, the opening and closing operation of the shutter blades 14 to 17 will be described.

24 and 25 show the actions of the components from the closed state of the lens barrier to the open state. FIG. 24 is a plan view of the lens barrier unit 32 seen from the front side, and FIG. 25 is a plan view seen from the back side. The dotted line in the figure shows the opening of the hood shield 20 . 26 and 27 are state diagrams showing the operation of each component from the state in which the lens barrier is opened to the state in which it is closed. In the following description, only the barrier switch ring 9, barrier cam ring 10, and barrier blades 14 to 17 among the components of the lens barrier unit are used to describe the operation (some shapes are simplified).

First, Fig. 24(a) and Fig. 25(a) are the states where the baffle blades 14-17 are completely closed. At this time, the first shutter ring spring 12 is at the maximum extension state, and the shutter switch ring 9 is fully rotated to the closed position (the indicator 90 of the shutter driving ring 10 is located at a position corresponding to the closing mark 91 of the lens cover 25 superior).

In addition, the second barrier switch spring 13 in the state shown in FIG. 24( a ) and FIG. 25( a ) is in a slightly elongated state than in the states shown in other figures. This is because the barrier switch ring 9 cannot be further rotated when the barrier blades 14 to 17 are completely closed and the barrier cam ring 10 directly connected to the barrier blades 14 to 17 is at the rotation limiting position. In this way, the amount of rotation of the barrier blades 14 to 17 can be given a margin, and the barrier blades 14 to 17 can be completely closed. Furthermore, since the first and second barrier blades 16 and 17 abut against the protrusions 14f and 15f of the third and fourth barrier blades 14 and 15, they are always restricted in the closing direction. The third and fourth barrier vanes 14 and 15 are constrained by the barrier cam ring 10 .

Then, from the state shown in Fig. 24 (a) and Fig. 25 (a), once the annular cover 23 (referring to Fig. 1) is rotated slightly, the shutter switch ring 9 is only rotated in the arrow Y direction, and becomes Fig. 24 (b) and the state shown in Fig. 25(b). In the state shown in FIG. 24( b ) and FIG. 25( b ), the elongation amount of the first barrier ring spring 12 becomes smaller by an amount corresponding to the rotation amount of the barrier switch ring 9 . In addition, the protrusion 9 c arranged on the back surface of the barrier switch ring 9 is in a positional relationship before touching the barrier cam ring 10 . Since the shutter switch ring 9 is rotated in the opening direction, the extension amount of the second shutter switch spring 13 is reduced by an amount corresponding to the rotation amount of the shutter switch ring 9 . However, since the protrusion 9c restricts the rotation of the barrier cam ring 10, the second barrier switch spring 13 receives a slight load and is in a state of being elongated from its natural length. In addition, since none of the barrier cam rings 10 is moving at the moment of illustration, the positions of the barrier blades 14 to 17 are not changed.

Then, from the state shown in Fig. 24(b) and Fig. 25(b), the annular cover 23 (refer to Fig. 1) is rotated slightly, and the state shown in Fig. 24(c) and Fig. 25(c) is reached. Under the state shown in Fig. 24(c) and Fig. 25(c), the amount of further elongation of the first flap ring spring 12 from the state shown in Fig. 24(b) and Fig. 25(b) is reduced by an amount equivalent to The amount of rotation. In addition, the protrusion 9c on the back surface of the barrier switch ring 9 touches the hole end surface of the barrier cam ring 10, and the barrier cam ring 10 is forcibly rotated to a predetermined position. In this way, the third barrier blade 14 and the fourth barrier blade 15 directly connected to the barrier cam ring 10 also rotate to a predetermined position.

In addition, the positional relationship between the first baffle vane 16 and the second baffle vane 17 is different. That is, the first barrier blade 16 always rotates in the closing direction due to its own weight, and the third barrier blade 14 and the first barrier blade 16 are overlapped as shown in FIG. 24( c ). In addition, as shown in FIG. 25( c ), the rotation of the first barrier blade 16 is restricted by the abutment of the rib 16 c provided on the back surface and the third barrier blade 14 . Accordingly, the first barrier blade 16 is opened at the same time as the third barrier blade 14 is opened.

On the other hand, the second shutter blade 17 always rotates in the opening direction due to its own weight, and the second shutter blade 17 is restricted from rotating in the opening direction when the second shutter blade 17 abuts against the protrusion 15 f. Accordingly, the fourth barrier blade 15 is opened and the second barrier blade 17 is opened.

The first and second baffle blades 16 and 17 are not fully synchronized with the movement of the third and fourth baffle blades 14 and 15, and there is a range where they are not synchronized and can rotate freely.

Next, if the annular cover 23 (refer to FIG. 1 ) is further rotated from the state shown in FIG. 24( c ) and FIG. 25( c ), it becomes the state shown in FIG. 24( d ) and FIG. 25( d ). As shown in Figure 24(d) and Figure 25(d), once the lens barrier is transitioned to the fully open state, the elongation of the first barrier ring spring 12 becomes minimum, and the barrier switch ring 9 is rotated to the fully open position. position (the indicator 90 of the barrier drive ring 22 is located at the position of the opening mark 92 of the lens hood 25). Furthermore, the first barrier blade 16 and the second barrier blade 17 are restricted in the opening direction due to the protrusions 16c and 17c of the third barrier blade 14 and the fourth barrier blade 15 . The positions of the third barrier blade 14 and the fourth barrier blade 15 are restricted by the barrier cam ring 10 .

26 and 27 have shown the closing operation of the baffle blades 14 to 17, but since it is the reverse operation of the above-mentioned opening operation, a detailed description of the operation will be omitted.

As described above, according to this embodiment, since the lens barrier of four barrier blades 14 to 17 is arranged in the dead space between the lens hood and the lens part, it is possible to have a lens barrier without changing the size of the existing lens cap. Both protection and lens hood function.

In addition, since the lens barrier unit 32 is detachably attached to the video recorder main body 8 by screwing, the lens barrier unit 32 is less likely to come off from the video recorder main body 8 due to impact. For example, even if the video recorder body 8 is accidentally dropped, the possibility of the lens barrier unit 32 coming off is low, and the lens can be reliably protected from damage.

In addition, since the barrier blades 14 to 17 are housed in the lens barrier unit 32 during shooting of the video recorder main body 8, the lens barrier does not interfere with shooting, and shooting can be performed comfortably.

In addition, since the lens barrier is opened and closed by the barrier driving ring 22 provided on the video recorder main body 8, the time from when the lens barrier is used to shooting can be significantly reduced. That is, when the main body of the video recorder is used in the past, the lens cap is removed from the front frame, and the lens cap is coupled to the holding protrusion to complete the shooting preparation. In contrast, in this embodiment, the shooting preparation is completed only by rotating the shutter driving ring 22. .

In addition, in the state where the lens barrier unit 32 is detached from the video recorder main body 8, by configuring the barrier blades 14 to 17 to always be open (storage state), it is possible to prevent the barrier from being damaged when shooting without attaching the lens hood. Dust and the like adhere to the blades 14 to 17 .

That is, when the video recorder main body 8 is detached from the lens barrier unit 32 and used (when the function of the lens hood is not used), in the state where the barrier blades 14-17 are closed, there is a possibility that the surface of the barrier blades 14-17 (Especially the surface facing the lens) has dust, etc. attached. If the lens barrier unit 32 is attached to the video recorder main body 8 in a state where dust is attached, dust or the like may be attached to the lens. In this embodiment, the barrier blades 14 to 17 are always accommodated when the lens barrier unit 32 is detached from the video recorder main body 8 , thereby preventing dust and the like from adhering to the barrier blades 14 to 17 .

(Embodiment 2)

FIG. 28 is a perspective view showing the configuration of the imaging device in Embodiment 1. FIG. FIG. 29 is an exploded perspective view showing the component configuration of the front portion of the imaging device in Embodiment 2. FIG. In addition, in the configuration of Embodiment 2 shown in FIG. 28 , constituent elements having the same numbers as those in Embodiment 1 are assigned the same functions and operations, and detailed description thereof will be omitted.

In FIG. 28 , the difference from the structure of Embodiment 2 is that there are no closing marks 91 and opening marks 92 shown in FIG. 1 and FIG. 2( b ).

In addition, in FIG. 29 , a notch portion 26 b for arranging a motor 41 and a two-stage gear 43 (described later) is formed in the front case 26 .

The ring 40 is rotatably arranged between the lens cover 25 and the front frame 28 . In addition, a coupling portion 40a is formed on the ring 40, and is coupled to the projection portion 9a inserted into the hole portion 28a. Furthermore, as shown in FIG. 5 , a protrusion 9 a is integrally provided on the barrier switch ring 9 , and protrudes on the surface side of the lens barrier unit 32 as shown in FIG. 4 . In addition, a tooth portion 40c is formed on the ring 40, and meshes with one tooth portion of a two-stage gear 43 (described later).

The motor 41 which is a driving mechanism is arranged in the cutout portion 26 b formed in the front case 26 and fixed to the front case 26 . A worm wheel 42 is arranged on an output shaft of the motor 41 and rotates together with the drive of the motor 41 . Although not shown, the motor 41 is energized when the power is turned on by a power switch which is an operating device on the main body of the video recorder. In addition, the electric motor 41 is not limited to the structure which energizes according to the operation of a power switch.

The two-stage gear 43 is coaxially and integrally arranged with two gears with different gear ratios. One of the two-stage gears 43 meshes with the worm wheel 42, and the other meshes with the tooth portion 40c. Furthermore, the two-stage gear 43 is rotatably arranged on the front case 26 .

In addition, in order to understand description easily, in FIG. 29, the motor 41, the worm wheel 42, and the two-stage gear 43 are drawn in the vicinity of the ring 40. As shown in FIG. In FIG. 29 , the relative positional relationship between the motor 41 , the worm wheel 42 , the two-stage gear 43 and the ring 40 is the state after the components are assembled.

The operation of the imaging device according to Embodiment 2 will be described below.

As shown in FIG. 29 , the front case 26 , the lens hood 25 , the ring 40 , and the front frame 28 on which the lens damper 27 is disposed are attached to each other to form a single body. Furthermore, between the lens cover 25 and the front frame 28, a ring 40 is disposed so as to be rotatable in the circumferential direction. Furthermore, a motor 41 and a two-stage gear 43 are fixed to the front case 26 . The integrated unit is fixed on the main body 8 of the video recorder as shown in FIG. 28 .

In FIG. 28, the external thread formed on the lens barrier unit 32 can be mounted on the video recorder main body 8 by screwing the external thread formed on the lens barrier unit 32 with the internal thread formed on the front frame 28 (refer to FIG. 29) fixed on the front surface of the lens cover 25. Lens barrier unit 32 .

In addition, when the lens barrier unit 32 is attached to the video recorder main body 8, the barrier blades 14 to 17 are normally closed as shown in FIG. 28 .

Next, when the lens barrier blades 14 to 17 are opened, a driving current is applied to the motor 41 , so that the motor 41 is driven to rotate the worm wheel 42 fixed to the output shaft of the motor 41 . By rotating the worm wheel 42 , the two-stage gear 43 meshing with the worm wheel 42 is rotated. When the two-stage gear 43 is rotated, a driving force is transmitted to the tooth portion 40c meshing with one gear of the two-stage gear 43, and the ring 40 is rotated in the circumferential direction.

When the ring 40 is rotated in the circumferential direction, the projections 9a and 9b of the lens barrier unit 32 coupled with the joints 40a and 40b of the ring 40 (for example, see FIG. As soon as the projections 9a and 9b are moved, the barrier blades 14 to 17 arranged in the lens barrier unit 32 are turned and opened respectively. When the shutter blades 14 to 17 are rotated to the fully open position, the driving of the motor 41 is stopped.

Furthermore, in the case of closing each of the shutter blades 14 to 17, the motor 41 is driven to reversely rotate the worm wheel 42 . Note that the "reverse rotation" means rotation in the opposite direction to the rotation direction of gears, rings, etc. when the shutter blades 14 to 17 are opened. When the worm wheel 42 rotates in reverse, the two-stage gear 43 also rotates in reverse, and the ring 40 meshing with the two-stage gear 43 also rotates in reverse. When the ring 40 is reversely rotated, the protrusions 9a and 9b of the lens barrier unit 32 combined with the coupling parts 40a and 40b move in the opposite direction relative to when the barrier blades 14-17 are opened. When the protrusions 9a and 9b are moved, the barrier blades 14 to 17 arranged in the lens barrier unit 32 are respectively rotated and closed. When the shutter blades 14 to 17 are rotated to the fully closed position, the driving of the motor 41 is stopped.

In addition, since the opening and closing operation|movement of each shutter blade 14-17 accompanying the movement of the protrusion part 9a and 9b was demonstrated in Embodiment 1, description is abbreviate|omitted.

As described above, according to this embodiment, since the barrier blades 14 to 17 in the lens barrier unit 32 are opened and closed by a motor or the like, it is possible to save the user from manually opening the lens barrier and improve operability.

In addition, since the lens barrier unit 32 can be detached from the video recorder main body 8, and electric opening and closing mechanisms such as the motor 41 and the two-stage gear 43 are arranged on the video recorder main body 8 side, even if the lens barrier is closed, If the electric closing mechanism is damaged in the state, if the lens barrier unit 32 is detached from the video recorder main body 8, the lens can be exposed, and photography can be normally performed.

In addition, the structure of the rotation drive ring 40 is not limited to the motor 41 shown in Embodiment 2, It can implement using a well-known drive mechanism.

Another example of the ring rotation mechanism will be described below.

FIG. 30 is a perspective view showing the structure of a rotation mechanism built into the main body of the video recorder. Fig. 31 is an exploded perspective view of the rotation mechanism. FIG. 30 and FIG. 31 are for easy understanding of the description, and descriptions of unnecessary components are omitted in the description.

In FIG. 30, a frame 50 holds a tape drive mechanism, various circuit boards, etc. in the main body of the video recorder. A pin 55 is erected on a side surface of the frame 50 , and the link 54 is rotatably supported by the pin 55 . One end portion (the front side of the video recorder body) of the link 54 is supported on the outer peripheral surface of the ring 56 in the ring unit 51 . In addition, a pin 54a is erected at the other end portion of the link 54 (the rear side of the video recorder body). On the rear face 50a of the frame 50, a rear case 52 is fixed. The rear case 52 is a part of the peripheral casing on the rear side (photographer side) of the video recorder main body. In addition, an opening 52 a is formed in the back case 52 . A switch 53 of the pointing mechanism is disposed near the opening 52a, and the switch 53 is guided by the opening 52a so as to be slidable in the arrow f direction and its opposite direction. The switch 53 corresponds to, for example, a power switch of the main body of the video recorder, and by sliding in the direction of arrow f from the state shown in FIG. 30 , the power inside the main body can be turned on. Also, the switch 53 is not limited to a power switch. A hole 53 a is formed on the back surface of the switch 53 with respect to the operation surface. The hole 53 a is inserted into the opening 52 a and is rotatably fitted to the pin 54 a of the link 54 .

The ring unit 51 has a front frame 28 (same structure as in FIG. 29 ) and a ring 56 , and the ring 56 is rotatably arranged on the outer peripheral portion of the front frame 28 . In addition, although not shown in figure, the ring unit 51 is fixed to the front case 26 (refer FIG. 29). Engaging portions 56a and 56b are provided on the ring 56 to engage protrusions 9a and 9b provided on the lens barrier unit 32 (see, for example, FIG. 5 ) when the lens barrier unit 32 (see FIG. 29 ) is attached.

Hereinafter, the operation will be described.

FIG. 30 shows a state in which the main body of the video recorder is not in use, assuming that the lens barrier unit 32 is attached to the surface side of the front frame 28 . By attaching the lens barrier unit 32, the protrusions 9a and 9b are combined with the joints 56a and 56b (see FIG. 31).

From this state, when the switch 53 is slid in the direction of the arrow f, the power of the video recorder body is turned on, and the hole 53a and the pin 54a are fitted, so that the link 54 rotates in the direction of the arrow g with the pin 55 as the axis. When the link 54 is rotated, the ring 56 fitted to the other end of the link 54 rotates in the arrow h direction about the optical axis (dashed line). When the ring 56 is rotated, the protrusions 9 a and 9 b (refer to FIG. 5 ) combined with the joints 56 a and 56 b move, and the lens barrier in the lens barrier unit 32 can be opened. Also, the front frame 28 does not rotate when the ring 56 rotates.

In addition, by sliding the switch 53 in the arrow f direction, the above-mentioned reverse operation is performed, and the lens barrier of the lens barrier unit 32 can be closed.

By configuring as shown in FIG. 30 and FIG. 31 , a motor for opening and closing the lens barrier is unnecessary, and the cost and power consumption can be reduced.

In addition, since the lens barrier is opened and closed in conjunction with the operation of the operation unit mounted on the main body of the video recorder, such as a power switch, there is no need to provide an operation unit dedicated to opening and closing the lens barrier, and the cost can be reduced, and the video recorder can be miniaturized. main body.

In addition, in this embodiment, the structure which has a pair of joint part (40a and 40b, 56a and 56b) in the ring 40 and the ring 56 was demonstrated as an example, but the joint protrusion part 9a or 9b may be provided The structure of a single junction of one of them. In addition, the ring 40 and the ring 56 have been described as an example in which the shapes of both the ring 40 and the ring 56 are closed in a cylindrical shape, but it is also possible to apply that only the part having a joint part (for example, 40a and 56a) has a cylindrical shape, and the other parts are The structure of the cut. In this structure, for example, as shown in FIG. 29 , when the motor 41 is used to drive, etc., by setting the driving source such as the motor 41 at the cut-out part of the ring 40, the combination of the driving source and the ring 40 can be avoided, which is sometimes preferable. .

Industrial Applicability

The present invention functions as a lens hood integrally with a lens cover protecting the lens, and is useful in video recorders, digital cameras, silver salt cameras, and the like.

claims

(Amended in accordance with Article 19 of the Treaty)

1. A lens hood device is mounted on the front end of a lens barrel mechanism and has an opening. The lens barrel mechanism has an objective lens that condenses the reflected light image of the subject, and the light of the opening and the above-mentioned objective lens The axis center is orthogonal and takes the optical axis center as the central axis, and is characterized in that it has:

a plurality of lens barriers slid rotatably between a position covering the entire surface of the opening and a position opening the opening; and

The housing part accommodates the plurality of lens barriers when the plurality of lens barriers are located at a position where the opening is opened,

The accommodating portion is composed of a first barrier case member and a second barrier case member. The first barrier case member has a rotation shaft to which the plurality of lens barriers are coupled and is located on the subject side. the second baffle shell part is combined with the above-mentioned first baffle shell part,

A groove portion penetrating the second baffle shell member is provided around the central axis of the second baffle shell member,

A barrier opening and closing switch part is provided in the gap between the first barrier shell part and the second barrier shell part, and the barrier opening and closing switch part is provided with a claw part, and the claw part penetrates the groove part and is loosely connected to the groove part. In this ditch,

A barrier drive transmission member is provided on the surface side of the second barrier case member opposite to the first barrier case member, and the barrier drive transmission member has a recess for fitting the claw portion through which the Ditch Department.

2. The lens hood device according to claim 1, wherein:

The accommodating portion is accommodated between a covering member covering the accommodating portion via the first baffle shell member and a detachable member fastened to the covering member,

The detachable member is detachably coupled to the front end of the lens barrel mechanism.

3. The lens hood device according to claim 2, wherein:

The first baffle case member and the second baffle case member have the openings,

The lens hood device has a shield member fixedly coupled to the second barrier case member and rotatably coupled to the covering member, and the shield member has a second opening portion having the opening. Openings that are larger than the area of the opening formed by the section.

4. An imaging device, characterized in that it has:

The lens barrel mechanism has an objective lens that condenses the reflected light image of the subject;

an imaging element, receiving the above-mentioned reflected light image condensed by the above-mentioned objective lens, and converting it into an image signal;

an information storage mechanism that stores the above-mentioned image signal converted by the above-mentioned imaging element in an information medium; and

The lens hood device according to claim 1, which is arranged at the front end of the lens barrel mechanism.

5. The imaging device according to claim 4, wherein:

A turning member is provided at a junction between the lens hood device and the front end, and the turning member moves the claw along the shape of the groove.

6. The imaging device according to claim 4, wherein:

further comprising a driving mechanism for applying a moving force of the claw portion along the shape of the groove portion,

An instructing mechanism is provided for instructing the driving mechanism to start applying the moving force.

Claims (7)

1. A lens hood device is mounted on the front end of a lens barrel mechanism and has an opening. The lens barrel mechanism has an objective lens that condenses the reflected light image of the subject, and the light of the opening and the above-mentioned objective lens The axis center is orthogonal and takes the optical axis center as the central axis, and is characterized in that it has: a plurality of lens barriers slid rotatably between a position covering the entire surface of the opening and a position opening the opening; and The accommodating portion accommodates the plurality of lens barriers when the plurality of lens barriers is located at a position where the opening is opened. 2. The lens hood device according to claim 1, wherein: The accommodating portion is composed of a first barrier case member and a second barrier case member. The first barrier case member has a rotation shaft to which the plurality of lens barriers are coupled and is located on the subject side. the second baffle shell part is combined with the above-mentioned first baffle shell part, A groove portion penetrating the second baffle shell member is provided around the central axis of the second baffle shell member, A barrier opening and closing switch part is provided in the gap between the first barrier shell part and the second barrier shell part, and the barrier opening and closing switch part is provided with a claw part, and the claw part penetrates the groove part and is loosely connected to the groove part. In this ditch, A barrier drive transmission member is provided on the surface side of the second barrier case member opposite to the first barrier case member, and the barrier drive transmission member has a recess for fitting the claw portion through which the Ditch Department. 3. The lens hood device according to claim 2, wherein: The accommodating portion is accommodated between a covering member covering the accommodating portion via the first baffle shell member and a detachable member fastened to the covering member, The detachable member is detachably coupled to the front end of the lens barrel mechanism. 4. The lens hood device according to claim 3, wherein: The first baffle case member and the second baffle case member have the openings, The lens hood device has a shield member fixedly coupled to the second barrier case member and rotatably coupled to the covering member, and the shield member has a second opening portion having the opening. Openings that are larger than the area of the opening formed by the section. 5. An imaging device, characterized in that it has: The lens barrel mechanism has an objective lens that condenses the reflected light image of the subject; an imaging element, receiving the above-mentioned reflected light image condensed by the above-mentioned objective lens, and converting it into an image signal; an information storage mechanism that stores the above-mentioned image signal converted by the above-mentioned imaging element in an information medium; and The lens hood device according to claim 1, which is arranged at the front end of the lens barrel mechanism. 6. The imaging device according to claim 5, wherein: A turning member is provided at a junction between the lens hood device and the front end, and the turning member moves the claw along the shape of the groove. 7. The imaging device according to claim 5, wherein: further comprising a driving mechanism for applying a moving force of the claw portion along the shape of the groove portion, An instructing mechanism is provided for instructing the driving mechanism to start applying the moving force.

Images