WO2012008163A1 - 3d adapter - Google Patents

Abstract

A 3D conversion lens (100) is provided with a first optical system (170L), a second optical system (170R), an exterior section (101), and an attaching ring (110). The attaching ring (110) is provided for the purpose of attaching the exterior section to a video camera main body (200). In a state wherein the exterior section (101) is attached to the video camera main body (200) by means of the attaching ring (110), the exterior section (101) is pressed, by means of the attaching ring (220), to the video camera main body (200) in the Y axis direction, which is parallel to the optical axis (A) of a main body optical system (220).

Description

3D adapter

The technology disclosed herein relates to a 3D adapter that can be attached to an imaging apparatus.

Patent Document 1 discloses a camera lens adapter for stereoscopic image capturing. This lens adapter is used by being attached to a video camera. By attaching this lens adapter to the video camera, a stereoscopic image can be taken.

JP 2003-50438 A

The lens adapter described in Patent Document 1 has a fixed knob. When the fixing knob is loosened, it is possible to adjust the rotational direction position of the lens adapter around the optical axis with respect to the photographing apparatus. When the fixing knob is tightened, the lens adapter is fixed to the photographing apparatus.
However, Patent Document 1 does not disclose a technique for accurately attaching the lens adapter to the photographing apparatus in the optical axis direction (direction parallel to the optical axis of the optical system of the photographing apparatus).
An object of the technology disclosed herein is to provide a 3D adapter that can be accurately attached to an imaging apparatus in the optical axis direction.

The 3D adapter disclosed herein is a 3D adapter that can be attached to an imaging apparatus having a main body optical system, and includes a first optical system, a second optical system, a housing, and an attachment member. . The first optical system guides light for forming a left-eye optical image to the main body optical system. The second optical system guides light for forming the optical image for the right eye to the main body optical system. The housing supports the first and second optical systems. The attachment member is provided to attach the housing to the imaging device. In a state where the housing is attached to the imaging device by the attachment member, the housing is pressed against the imaging device by the attachment member in the optical axis direction parallel to the optical axis of the main body optical system.
In this 3D adapter, the housing is pressed against the imaging device in the optical axis direction by the mounting member in a state where the housing is attached to the imaging device by the mounting member. Therefore, the position of the housing in the optical axis direction with respect to the imaging device is stable, and the 3D adapter can be attached to the imaging device with high accuracy in the optical axis direction.

As described above, according to the technique disclosed herein, it is possible to provide a 3D adapter that can be accurately attached to the imaging apparatus in the optical axis direction.

The perspective view which showed the state which attached the 3D conversion lens 100 to the video camera main body 200. The perspective view which showed the state which removed the 3D conversion lens 100 from the video camera main body 200 Exploded perspective view of 3D conversion lens 100 Schematic diagram showing an image captured by the video camera body 200 with the 3D conversion lens 100 attached (A) The 3D conversion lens 100 is viewed from the opposite side of the subject, (B) The video camera body 200 is viewed from the subject side. Sectional view with the 3D conversion lens 100 attached to the video camera body 200 (cross-sectional view taken along line VI-VI in FIG. 5A) Perspective view of mounting ring 110 and rear case 120 The perspective view which showed the state which removed the 3D conversion lens 100 from the video camera main body 200 (2nd Embodiment). The figure which shows the state which attached the 3D conversion lens 300 to the video camera main body 200 (3rd Embodiment). The figure which shows the state which removed the 3D conversion lens 300 from the video camera main body 200 (3rd Embodiment). The figure which looked at the video camera body 200 from the subject side Partial perspective view of the video camera body 200 Partial development view of the front frame 410 viewed from the inner periphery side Exploded perspective view of 3D conversion lens 300 Perspective view of rear case 320 (A) Cross section of rear case 320, (B) XVIB-XVIB cross section of FIG. 16 (A) Exploded perspective view of mounting ring unit 310 (A), (B) Cross section of mounting ring 314 (A) XIXA-XIXA cross-sectional view of FIG. 18 (B), (B) XIXB-XIXB cross-sectional view of FIG. 18 (B) Perspective view of 3D conversion lens 300 Partial perspective view of 3D conversion lens 300 Rear view of 3D conversion lens 300 Rear view of 3D conversion lens 300 XXIV-XXIV cross section of Fig. 22 The figure explaining the operation | work which mounts the 3D conversion lens 300 in the video camera main body 200. (A) Cross-sectional view of 3D conversion lens 300 (unlocked state), (B) Partial cross-sectional view of 3D conversion lens 300 (unlocked state), (C) Cross-sectional view of 3D conversion lens 300 (unlocked state) (A) Cross section of 3D conversion lens 300, (B) Partial cross section of 3D conversion lens 300, (C) Cross section of 3D conversion lens 300 (A) Cross-sectional view of 3D conversion lens 300 (locked state), (B) Partial cross-sectional view of 3D conversion lens 300 (locked state), (C) Cross-sectional view of 3D conversion lens 300 (locked state) Partial development view of the front frame 410 viewed from the inner periphery side Sectional drawing around the 3D conversion lens 300 and the mounting spring 313 of the front frame 410 Sectional drawing in the state which attached the 3D conversion lens 100 to the video camera main body 200 (other embodiment). The figure which looked at the front frame 210 of the video camera main body 200 from the to-be-photographed object side (other embodiment). Sectional drawing around the annular protrusion 314c of the 3D conversion lens 300 and the front frame 410

[First Embodiment]
[Overall configuration of 1.3D camera]
The overall configuration of the 3D camera 1 having the 3D conversion lens 100 according to the first embodiment will be described with reference to FIGS. FIG. 1 is a perspective view showing a state in which the 3D conversion lens 100 is attached to the video camera body 200. FIG. 2 is a perspective view showing a state where the 3D conversion lens 100 is detached from the video camera body 200. FIG. 3 is an exploded perspective view of the 3D conversion lens 100.
As shown in FIGS. 1 to 3, a three-dimensional orthogonal coordinate system is set for the 3D camera 1 (the 3D conversion lens 100 and the video camera body 200). The X axis is set parallel to the left-right direction when the 3D camera 1 is used. The Y axis is set parallel to the optical axis A of the 3D camera 1 (or substantially parallel to the left eye optical axis AL and the right eye optical axis AR). The Z axis is set parallel to the vertical direction (vertical direction) when the 3D camera 1 is used. In the following description, the X-axis direction is a direction parallel to the X-axis. Further, the Y-axis direction is an example of an optical axis direction parallel to the optical axis A and a direction parallel to the Y-axis. Further, the Z-axis direction is a direction parallel to the Z-axis. The left side facing the subject is the positive side in the X-axis direction. The subject side in the Y-axis direction is the Y-axis direction positive side. The upper side along the Z-axis direction is taken as the Z-axis direction positive side.

As shown in FIGS. 1 and 2, the 3D camera 1 includes a video camera main body 200 and a 3D conversion lens 100 that can be attached to the video camera main body 200.
(1) Video camera body 200
As shown in FIGS. 1 to 3, the video camera body 200 includes a main body optical system 220 having a plurality of lenses, an image sensor (not shown), a recording medium (not shown) for recording a captured image, And a front frame 210. The main body optical system 220 (an example of the main body optical system) forms an optical image of a subject. The imaging device converts the optical image formed by the main body optical system 220 into image data. The video camera body 200 can convert an optical image formed on the image sensor into image data and record it on a recording medium. For example, optical components such as a teleconversion lens and a wide conversion lens can be mounted on the front frame 210. In the present embodiment, the 3D conversion lens 100 is attached to the front frame 210 in the same manner as other optical components.

(2) 3D conversion lens 100
As shown in FIGS. 1 to 3, the 3D conversion lens 100 (an example of a 3D adapter) includes an exterior part 101, a lens unit 130, and a mounting ring 110.
The exterior portion 101 (an example of a housing) includes a front case 150, a top case 160, a bottom case 140, and a rear case 120. The front case 150 is fixed to the bottom case 140 and the top case 160 while being sandwiched between the bottom case 140 and the top case 160. The bottom case 140 is fitted into the top case 160 and is fixed to the top case 160 with screws. The rear case 120 is fixed to the top case 160 and the bottom case 140 with screws.
The lens unit 130 includes a lens unit frame 131, a first optical system 170L, and a second optical system 170R. The lens unit frame 131 accommodates the first optical system 170L and the second optical system 170R, and is connected to the top case 160, for example.

The first optical system 170L (an example of the first optical system) has a left-eye optical axis AL and guides light for forming a left-eye optical image to the main optical system 220 of the video camera main body 200. The second optical system 170R (an example of the second optical system) has a right-eye optical axis AR, and guides light for forming a right-eye optical image to the main body optical system 220 of the video camera body 200. The first optical system 170L and the second optical system 170R are supported by the lens unit frame 131. Since the exterior part 101 supports the lens unit frame 131, it can be said that the exterior part 101 supports the first optical system 170L and the second optical system 170R.
The first optical system 170L and the second optical system 170R may share some lenses, or may provide all the lenses separately. Further, the first optical system 170L and the second optical system 170R may not have a lens, and may have only an optical component other than a lens such as a mirror.

The attachment ring 110 (an example of an attachment member) is an annular member for attaching the exterior portion 101 to the video camera main body 200, and is rotatably supported by the exterior portion 101. Details of the mounting ring 110 will be described later.
In the video camera body 200 to which the 3D conversion lens 100 is attached, the left-eye and right-eye optical images incident through the two optical systems (the first optical system 170L and the second optical system 170R) are simultaneously displayed on the image sensor 230. Is imaged. Therefore, the video camera main body 200 can capture side-by-side images including left-eye and right-eye images with the 3D conversion lens 100 attached. An image captured with the 3D conversion lens 100 attached is an image as shown in FIG. By using such a side-by-side image, a stereoscopic image can be viewed on a 3D-compatible display.

However, if the mounting accuracy of the 3D conversion lens 100 with respect to the video camera main body 200 is lowered, the left-eye and right-eye optical images formed by the 3D conversion lens 100 and the main body optical system 220 are greatly increased from a predetermined position on the image sensor. It will shift. As a result, the positions of the left-eye and right-eye images included in the side-by-side image are also shifted. When such a side-by-side image is viewed on a 3D-compatible display, for example, a stereoscopic effect is excessive or a stereoscopic effect is not generated.
Therefore, in order to attach the 3D conversion lens 100 to the video camera main body 200 with high accuracy in the Y-axis direction, the 3D conversion lens 100 and the video camera main body 200 have structures as described below.

[2.3D Conversion Lens 100 and Video Camera Body 200 Attached Portion]
The structure of the attachment portion between the 3D conversion lens 100 and the video camera body 200 will be described with reference to FIGS. FIG. 5A is a view of the 3D conversion lens 100 as viewed from the side opposite to the subject. FIG. 5B is a view of the video camera body 200 as viewed from the subject side. 6 is a cross-sectional view taken along the line VI-VI in FIG. FIG. 7 is a perspective view of the mounting ring 110 and the rear case 120.
In order to attach the 3D conversion lens 100 to the video camera body 200 with high accuracy in the Y-axis direction, the exterior part 101 includes a body part 102, a flange part 103, a first protrusion 120b, and a second protrusion 120c. Have.
(1) Main unit 102
A main body 102 (an example of a housing main body) accommodates a lens unit 130. The main body 102 is formed by a front case 150, a part of the top case 160, a part of the bottom case 140, and a rear case main body 121 of the rear case 120.
(2) Flange part 103
The flange portion 103 (an example of a contact portion) is formed by a part of the top case 160 and a part of the bottom case 140. The flange portion 103 is a substantially annular portion disposed at the end of the main body portion 102. More specifically, as shown in FIG. 6, the main body portion 102 has a cylindrical portion 104, and the flange portion 103 extends radially inward from the end portion of the cylindrical portion 104. The attachment ring 110 is disposed on the inner peripheral side of the cylindrical portion 104 and the flange portion 103. The flange portion 103 has a contact surface 103a that is disposed so as to be able to contact the video camera body 200 in the Y-axis direction.
As shown in FIG. 5A, in the present embodiment, the contact surface 103a is disposed on the outer side in the radial direction than the connecting portion 111 (described later) of the mounting ring 110. In other words, the contact surface 103 a is arranged at a position farther from the optical axis A than the connecting portion 111 in a state where the exterior portion 101 is attached to the video camera body 200 by the attachment ring 110.

(3) First protrusion 120b and second protrusion 120c
As shown in FIGS. 5A, 6, and 7, the first protrusion 120 b and the second protrusion 120 c are part of the rear case 120. Specifically, the rear case 120 includes a rear case main body 121 included in the main body portion 102, a first protrusion 120b, and a second protrusion 120c. As shown in FIG. 6, the rear case main body 121 is an annular member fixed to the top case 160, for example, and is disposed on the inner peripheral side of the attachment ring 110.
In the present embodiment, the rear case 120 is composed of a single member formed integrally, but may be composed of a plurality of members.

As shown in FIG. 7, the first protrusion 120 b and the second protrusion 120 c protrude from the rear case main body 121 in the Y-axis direction. Since the rear case main body 121 is included in the main body portion 102, it can be said that the first protrusion 120b and the second protrusion 120c protrude from the main body portion 102 in the Y-axis direction.
As shown in FIGS. 5A and 5B, the first protrusion 120b (an example of the restricting portion, an example of the first positioning portion) is a position corresponding to a first hole 210b (described later) of the video camera body 200. Is arranged. Further, the second protrusion 120c (an example of a restricting portion, an example of a second positioning portion) is disposed at a position corresponding to a second hole 210c (described later) of the video camera body 200.

As shown in FIG. 5A, in the present embodiment, the first protrusion 120b and the second protrusion 120c are arranged at positions that are substantially symmetrical with respect to the optical axis A. The first protrusion 120b is disposed on the X axis direction negative side of the optical axis A (the same side as the right eye optical axis AR with respect to the optical axis A), and the second protrusion 120c is the positive side of the optical axis A in the X axis direction ( The optical axis A is disposed on the same side as the left eye optical axis AL).
In a state where the 3D conversion lens 100 is attached to the video camera body 200, the first protrusion 120b and the second protrusion 120c are inserted into the first hole 210b and the second hole 210c of the video camera body 200, respectively.
(4) First hole 210b and second hole 210c
As shown in FIGS. 5B and 6, the front frame 210 of the video camera body 200 has a support screw portion 210a, an opening 210e, a first hole 210b, and a second hole 210c. . The support screw portion 210a is provided for mounting an optical component such as a teleconversion lens or a wide conversion lens. When attaching the 3D conversion lens 100 to the video camera body 200, an attachment ring 110 (described later) of the 3D conversion lens 100 is screwed into the support screw portion 210a. The light that has passed through the 3D conversion lens 100 enters the optical system 220 through the opening 210e.

As shown in FIG. 6, the first hole 210b (an example of the main body recess) is provided for inserting the first protrusion 120b and is recessed in the Y-axis direction. The second hole 210c (an example of the main body recess) is provided for inserting the second protrusion 120c and is recessed in the Y-axis direction.
As shown in FIG. 5B, the first hole 210b and the second hole 210c are arranged on the outer peripheral side of the opening 210e. The first hole 210b and the second hole 210c are disposed on the inner peripheral side of the support screw portion 210a. In the present embodiment, the first hole 210b and the second hole 210c are disposed at positions that are substantially symmetrical with respect to the optical axis A. The first hole 210b is disposed on the X axis direction negative side of the optical axis A. The second hole 210c is disposed on the X axis direction positive side of the optical axis A.
In a state where the 3D conversion lens 100 is attached to the video camera body 200, the first protrusion 120b and the second protrusion 120c are inserted into the first hole 210b and the second hole 210c, respectively. Attachment of the 3D conversion lens 100 to the video camera body 200 is performed by the attachment ring 110.

(5) Mounting ring 110
The attachment ring 110 is an annular member for attaching the exterior portion 101 to the video camera body 200, and is provided so as to be connectable to the video camera body 200. Specifically, as shown in FIG. 6, the attachment ring 110 has a grip portion 113, a pressing portion 112, and a connecting portion 111.
In the present embodiment, the mounting ring 110 is composed of a single member formed integrally, but may be composed of a plurality of members.
The grip portion 113 is used when the user rotates the attachment ring 110 when attaching or detaching the 3D conversion lens 100. A part of the grip part 113 is exposed to the outside from the long holes 141 and 161 (see FIG. 3) provided in the cylindrical part 104 of the exterior part 101 so that the user can operate the grip part 113. The outer diameter of the grip part 113 is larger than the outer diameters of the pressing part 112 and the connecting part 111.

As shown in FIG. 6, the pressing portion 112 is disposed so as to be able to contact the exterior portion 101 in the Y-axis direction. More specifically, the pressing portion 112 is disposed so as to be able to contact the flange portion 103 in the Y-axis direction. The pressing part 112 extends from the grip part 113 to the Y axis direction negative side (video camera body 200 side). The grip portion 113 and the pressing portion 112 are disposed in the exterior portion 101 (more specifically, in the main body portion 102). The outer diameter of the pressing part 112 is larger than the outer diameter of the connecting part 111.
The connecting portion 111 is provided so as to be connectable to the video camera body 200 and has a mounting screw portion 110a. The attachment screw portion 110a (an example of the attachment screw portion) is screwed into the video camera main body 200 (more specifically, the support screw portion 210a of the front frame 210) when attaching the attachment ring 110 to the video camera main body 200. The connecting portion 111 extends from the pressing portion 112 to the Y axis direction negative side (video camera body 200 side), and is inserted into the annular flange portion 103. The attachment screw part 110a protrudes outward from the exterior part 101.

The mounting ring 110 is supported by the exterior portion 101 so as to be rotatable around the optical axis A. By rotating the attachment ring 110 with respect to the exterior portion 101, the attachment screw portion 110a is screwed into the support screw portion 210a (an example of the support screw portion) of the front frame 210, or the attachment screw portion 110a is screwed into the support screw portion 210a. And can be removed.
In the present embodiment, the mounting screw portion 110a is a male screw and the support screw portion 210a is a female screw, but the mounting screw portion 110a is a female screw and the support screw portion 210a is a male screw. There may be.
(6) Details of the first protrusion 120b, the second protrusion 120c, the first hole 210b, and the second hole 210c When the 3D conversion lens 100 is attached to the video camera body 200, the first protrusion 120b is formed in the first hole 210b. The second protrusion 120c is inserted into the second hole 210c. The first protrusion 120b and the second protrusion 120c restrict the rotation of the exterior portion 101 around the optical axis A relative to the video camera body 200, and further restrict the movement of the exterior portion 101 relative to the video camera body 200 in the radial direction. .

As shown in FIGS. 5A and 5B, the planar shape of the first hole 210b is substantially the same as the planar shape of the first protrusion 120b, and the planar shape of the second hole 210c is the second protrusion. It is almost the same as the planar shape of 120c. For this reason, the clearance gap formed between the 1st protrusion 120b and the 1st hole 210b is very small, and the clearance gap formed between the 2nd protrusion 120c and the 2nd hole 210c is very small. Therefore, when the first protrusion 120b and the second protrusion 120c are inserted into the first hole 210b and the second hole 210c, respectively, the first protrusion 120b and the second protrusion 120c are rotated around the optical axis A or in the radial direction. In contact with the side walls of the first hole 210b and the second hole 210c.
As described above, when the 3D conversion lens 100 is attached to the video camera body 200, the light of the 3D conversion lens 100 with respect to the video camera body 200 is formed by the first protrusion 120b, the second protrusion 120c, the first hole 210b, and the second hole 210c. The rotational position around the axis A (mounting angle) and the radial position are substantially determined.

In the present embodiment, the first protrusion 120b and the second protrusion 120c are protrusions that protrude from the rear case body 121 in the Y-axis direction. The first hole 210b and the second hole 210c are recessed portions that are recessed in the Y-axis direction. However, the first protrusion 120b, the second protrusion 120c, the first hole 210b, and the second hole 210c are not necessarily configured as described above, and the first protrusion 120b and the second protrusion 120c are recessed in the Y-axis direction. And the convex part which the 1st hole 210b and the 2nd hole 210c protrude in the Y-axis direction may be sufficient. In short, it is sufficient that at least the rotation of the 3D conversion lens 100 around the optical axis A with respect to the video camera body 200 is restricted by the convex portions and the concave portions. Therefore, it is sufficient that at least one convex portion and at least one concave portion are provided. Moreover, the recessed part should just have the hole into which a convex part is inserted, and the hole may be a through-hole.

Here, the shapes of the first protrusion 120b, the second protrusion 120c, the first hole 210b, and the second hole 210c will be described in more detail.
In the present embodiment, the shape of the first protrusion 120b is different from the shape of the second protrusion 120c, and the shape of the first hole 210b is different from the shape of the second hole 210c. Specifically, as shown in FIG. 5A, the length L11 of the first protrusion 120b in the circumferential direction (generally the Z-axis direction) is different from the length L12 of the second protrusion 120c in the circumferential direction. . In the present embodiment, the length L12 of the second protrusion 120c in the circumferential direction (generally the Z-axis direction) is greater than the length L11 of the first protrusion 120b in the circumferential direction. As shown in FIG. 6, the length L1 of the first protrusion 120b in the Y-axis direction is different from the length L2 of the second protrusion 120c in the Y-axis direction. In the present embodiment, the length L2 of the second protrusion 120c in the Y-axis direction is larger than the length L1 of the first protrusion 120b in the Y-axis direction.

As shown in FIG. 5B, the circumferential length L31 of the first hole 210b is different from the circumferential length L32 of the second hole 210c. In the present embodiment, the circumferential length L32 of the second hole 210c is larger than the circumferential length L31 of the first hole 210b. The length L31 of the first hole 210b is slightly larger than the length L11 of the first protrusion 120b. The length L32 of the second hole 210c is slightly larger than the length L12 of the second protrusion 120c.
Further, since the circumferential length L12 of the second protrusion 120c is larger than the circumferential length L31 of the first hole 210b, the second protrusion 120c cannot be inserted into the first hole 210b. Thereby, the situation where a user attaches the 3D conversion lens 100 upside down with respect to the video camera main body 200 can be prevented.
Further, as shown in FIG. 6, the length L21 of the first hole 210b in the Y-axis direction is different from the length L22 of the second hole 210c in the Y-axis direction. In the present embodiment, the length L22 of the second hole 210c in the Y-axis direction is larger than the length L21 of the first hole 210b in the Y-axis direction. The length L21 of the first hole 210b is slightly larger than the length L1 of the first protrusion 120b. The length L22 of the second hole 210c is slightly larger than the length L2 of the second protrusion 120c.

In a state where the exterior part 101 is attached to the video camera body 200 by the attachment ring 110, the exterior part 101 is pressed against the video camera body 200 by the attachment ring 110 in the Y-axis direction. Specifically, as shown in FIG. 6, in a state where the connecting portion 111 is connected to the front frame 210 of the video camera body 200 via the mounting screw portion 110 a, the flange portion 103 is connected to the front frame 210 by the pressing portion 112. Is pressed in the Y-axis direction, and is sandwiched between the pressing portion 112 and the front frame 210. At this time, the contact surface 103a of the flange portion 103 is in contact with the front surface 210d of the front frame 210 in the Y-axis direction. The contact surface 103a is in contact with the front surface 210d of the front frame 210 over the entire circumference. Note that the contact surface 103a may not be annular, and the flange portion 103 may contact the front frame 210 at a plurality of locations.
[Attachment work of 3D conversion lens and video camera body]
Next, an operation for attaching the 3D conversion lens 100 to the video camera body 200 will be described with reference to FIG. FIG. 6 is a cross-sectional view of the 3D conversion lens 100 attached to the video camera body 200. This sectional view shows a part of a section obtained by cutting the video camera main body 200 to which the 3D conversion lens 100 is attached at a position indicated by VI-VI in FIG.

First, the first protrusion 120b and the second protrusion 120c of the 3D conversion lens 100 are inserted into the first hole 210b and the second hole 210c of the video camera body 200, respectively, and the front end of the mounting screw part 110a of the mounting ring 110 is moved forward. It is inserted into the support screw part 210a of the frame 210.
When the attachment ring 110 is rotated while pressing the exterior portion 101 with the attachment screw portion 110a of the attachment ring 110 inserted into the support screw portion 210a of the front frame 210, the attachment screw portion 110a gradually becomes the support screw portion 210a. Screwed. As a result, the flange portion 103 of the exterior portion 101 is gradually pressed in the Y-axis direction against the video camera main body 200 by the pressing portion 112 of the mounting ring 110 (more specifically, the pressing surface 110d of the pressing portion 112). The flange portion 103 is sandwiched between the portion 112 and the front frame 210. When the attachment ring 110 is strongly tightened, the flange portion 103 is sandwiched between the pressing surface 110d of the pressing portion 112 and the front surface 210d of the front frame 210 with a strong force. As a result, there is almost no gap between the pressing surface 110d and the flange portion 103, and between the flange portion 103 and the front frame 210, and the 3D conversion lens 100 is accurate with respect to the video camera body 200 in the Y-axis direction. Can be fixed well.
Note that the 3D conversion lens 100 can be detached from the video camera body 200 by rotating the attachment ring 110 in the direction opposite to that at the time of attachment.

[Features of 4.3D conversion lens 100]
The characteristics of the 3D conversion lens 100 described above are summarized below.
(1) In this 3D conversion lens 100, the exterior part 101 is attached to the video camera body 200 in the Y-axis direction (optical axis direction) with the exterior part 101 attached to the video camera body 200 by the attachment ring 110. ) By the mounting ring 110. Therefore, the position of the exterior portion 101 in the Y-axis direction with respect to the video camera body 200 is stable, and the 3D conversion lens 100 can be attached to the video camera body 200 with high accuracy in the Y-axis direction.

(2) Since the mounting ring 110 has the connecting portion 111 and the pressing portion 112, the pressing portion 112 is mounted on the exterior by screwing the mounting screw portion 110a of the connecting portion 111 into the support screw portion 210a of the front frame 210. The exterior portion 101 is pressed against the video camera main body 200 by the pressing portion 112 by contacting the portion 101 (more specifically, the flange portion 103) in the Y-axis direction. Therefore, the 3D conversion lens 100 can be accurately attached to the video camera body 200 with a simple configuration.
Further, since the flange portion 103 is sandwiched between the pressing portion 112 and the video camera body 200, the posture of the 3D conversion lens 100 with respect to the video camera body 200 is easily stabilized.
(3) Since the contact surface 103a of the flange portion 103 is disposed at a position farther from the optical axis A than the connecting portion 111, it is easy to ensure a large distance from the optical axis A to the contact surface 103a. The posture of the 3D conversion lens 100 with respect to the camera body 200 can be further stabilized.

(4) Since the connecting portion 111 of the attachment ring 110 has the attachment screw portion 110a, the attachment ring 110 is attached to the video camera using the support screw portion 210a for attaching the optical component provided in the video camera body 200. The main body 200 can be connected. Thereby, it is not necessary to provide a special structure in the video camera body 200, and the versatility of the 3D conversion lens 100 can be improved.
(5) In the 3D conversion lens 100, the first protrusion 120b and the second protrusion 120c are in contact with the video camera main body 200 in the rotation direction, so that the rotation of the exterior portion 101 relative to the video camera main body 200 around the optical axis A is restricted. Is done. Therefore, the exterior portion 101 can be positioned in the rotation direction with respect to the video camera body 200, and the left-eye and right-eye optical images can be prevented from being displaced from a predetermined position on the image sensor.
Further, the first protrusion 120b and the second protrusion 120c abut against the video camera body 200 in the radial direction, so that the movement of the exterior portion 101 with respect to the video camera body 200 in the radial direction is restricted. Therefore, the exterior portion 101 can be positioned in the radial direction with respect to the video camera main body 200, and the left-eye and right-eye optical images can be prevented from shifting from a predetermined position on the image sensor.

(6) Since the first protrusion 120b and the second protrusion 120c are protrusions protruding in the Y-axis direction, the video camera main body 200 is simply provided with recesses such as the first hole 210b and the second hole 210c. Positioning of the exterior portion 101 with respect to the camera body 200 in the rotational direction or the radial direction can be performed. Therefore, the 3D conversion lens 100 can be accurately attached to the video camera body 200 with a simple configuration.

(7) The shape of the first protrusion 120b is different from the shape of the second protrusion 120c. For example, the circumferential length L11 of the first protrusion 120b is different from the circumferential length L12 of the second protrusion 120c. With such a configuration, for example, it is possible to prevent the 3D conversion lens 100 from being attached upside down with respect to the video camera body 200.
[Second Embodiment]
In the first embodiment described above, the attachment member is described by taking the attachment ring 110 as an example, but the configuration of the attachment member is not limited to the attachment ring 110. For example, the attachment member may have a configuration as shown in FIG. In the following description, the same reference numerals are used for configurations having substantially the same functions as those of the first embodiment described above, and detailed descriptions thereof are omitted.
As shown in FIG. 8, the 3D conversion lens 100 according to the second embodiment includes a pair of mounting hooks 170 (an example of a mounting member), and the video camera body 200 includes a pair of mounting holes 220a. . The attachment hooks 170 are respectively hooked in the attachment holes 220a. Specifically, the attachment hook 170 is fixed to the exterior part 101 and protrudes from the exterior part 101 in the Y-axis direction. The attachment hook 170 is formed of a member having elasticity such as a spring material, for example, and has a hook body 170a and a barb 170b. A first end of the hook body 170 a is fixed to the exterior part 101. The barb 170b is provided at the second end of the hook body 170a. When connecting the attachment hook 170 to the video camera body 200, the barbs 170b are respectively hooked in the attachment holes 220a. A force that presses the exterior portion 101 against the front frame 210 of the video camera body 200 in the Y-axis direction is generated by the mounting hook 170 in a state where the return 170b is caught in the mounting hole 220a. Even with such a configuration, the exterior portion 101 can be pressed against the video camera body 200 in the Y-axis direction. In short, any configuration may be used as long as the mounting member presses the casing against the imaging device in the optical axis direction (direction parallel to the optical axis of the main optical system of the imaging device).

[Third Embodiment]
In the first embodiment described above, the attachment member is described by taking the attachment ring 110 as an example, but the configuration of the attachment member may have a configuration as described below. In the following description, the same reference numerals are used for configurations having substantially the same functions as those of the first embodiment described above, and detailed descriptions thereof are omitted.
[Overall configuration of 1.3D camera]
FIG. 9 shows a state where the 3D conversion lens 300 according to the third embodiment is attached to the video camera body 200. As illustrated in FIG. 9, the 3D camera 1 includes a video camera body 200 and a 3D conversion lens 300 (an example of a 3D adapter). The 3D conversion lens 300 is attached to the front frame 410 of the video camera body 200. The front frame 410 is a member corresponding to the front frame 210 described above.
FIG. 10 shows a state where the 3D conversion lens 300 is detached from the video camera body 200. As shown in FIG. 10, the 3D conversion lens 300 can be attached to and detached from the front frame 410 of the video camera body 200.

(1) Video camera body 200
FIG. 11 is a view of the video camera body 200 as seen from the subject side. As shown in FIG. 11, the front frame 410 has four claw fitting portions 410b in addition to the first hole 210b and the second hole 210c described above. The claw fitting portion 410b is provided to attach the 3D conversion lens 300 to the video camera body 200, and is integrally formed of resin. The four claw fitting portions 410b are arranged at equal intervals in the circumferential direction. The claw fitting portion 410b has a fitting groove 410c. Insertion recesses 410a are formed between adjacent claw fitting portions 410b. The four insertion recesses 410a are arranged at equal intervals in the circumferential direction.

FIG. 12 is a partial perspective view of the video camera body 200. As shown in FIG. 12, the fitting groove 410c is elongated in the circumferential direction. One end of the fitting groove 410c is connected to the insertion recess 410a.
Threaded portions 412 are formed on the inner peripheral surface of the claw fitting portion 410b in order to mount optical components such as a teleconversion lens and a wide conversion lens. The effective diameter of the screw portion 412 is the same as the effective diameter of the support screw portion 210a described above.
FIG. 13 is a partial development view of the front frame 410 viewed from the inner peripheral side. As shown in FIG. 13, a portion connected to the insertion recess 410a of the fitting groove 410c is defined as a first end E1, and an end opposite to the first end E1 is defined as a second end E2. In the fitting groove 410c, the width of the first end E1 is wider than the width of the second end E2, and the width gradually decreases in the middle from the first end E1 to the second end E2. It has become.

The configuration of the fitting groove 410c will be described in more detail. The fitting groove 410 c has a first side surface 416 and a second side surface 415. The first side surface 416 is a plane perpendicular to the Y axis. The second side surface 415 is disposed on the subject side of the first side surface 416 and has a support surface 415a and a guide surface 415b. The support surface 415 a is parallel to the first side surface 416, but the guide surface 415 b is inclined with respect to the first side surface 416. The guide surface 415b is inclined so as to gradually approach the first side surface 416 as it goes to the second end E2.
Further, the fitting groove 410c is shifted from the center in the width direction of the claw fitting portion 410b to the Y axis direction negative side (the side opposite to the subject). The width L42 of the front wall 410e of the claw fitting portion 410b is substantially the same as the width L41 of the fitting groove 410c (the width of the second end E2). Compared with the case where the fitting groove 410c is arranged at the center in the width direction of the claw fitting portion 410b, the width L42 of the front wall 410e of the claw fitting portion 410b can be set larger, and the claw fitting portion 410b. It becomes easy to secure the strength of.

(2) 3D conversion lens 300
FIG. 14 is an exploded perspective view of the 3D conversion lens 300. As illustrated in FIG. 14, the 3D conversion lens 300 (an example of a 3D adapter) includes an exterior portion 101, a lens unit 130, and an attachment ring unit 310 (an example of an attachment member). The lens unit 130 is accommodated in the exterior part 101. The exterior part 101 (an example of a housing) includes a front case 150, a top case 160, a bottom case 140, and a rear case 320. The top case 160 has a first opening 360a (an example of the first opening) that is elongated in the circumferential direction. The bottom case 140 has a second opening 340a (an example of a second opening) that is elongated in the circumferential direction. The rear case 320 is fixed to the top case 160 and the bottom case 140 with screws.

FIG. 15 is a perspective view of the rear case 320. As shown in FIG. 15, the rear case 320 is integrally formed of resin. The rear case 320 has a first case part 321 and a second case part 322.
The first case portion 321 is fixed to the top case 160 and the bottom case 140 with screws. The first case portion 321 has a first accommodating recess 323. The first housing recess 323 is recessed toward the inner peripheral side. An arcuate spring sliding surface 320 a is formed on the bottom surface of the first receiving recess 323. The spring sliding surface 320a is elongated in the circumferential direction.
The second case part 322 is disposed at the rear part of the first case part 321. The first protrusion 120b and the second protrusion 120c described above are provided at the end of the second case portion 322.
FIG. 16A is a cross-sectional view of the rear case 320. The first case portion 321 has a second receiving recess 324 disposed on the opposite side of the first receiving recess 323 across the rotation center C of the mounting ring unit 310. The second housing recess 324 is recessed on the inner peripheral side. The depth of the second housing recess 324 is substantially the same as the depth of the first housing recess 323. Unlike the first housing recess 323, a rib 324 a is provided in the second housing recess 324. The rib 324a protrudes radially outward from the bottom surface of the second housing recess 324.

FIG. 16B is a cross-sectional view taken along the line XVIB-XVIB of FIG. The circumferential length of the first housing recess 323 is substantially the same as the circumferential length of the second housing recess 324. The rib 324a is formed from end to end of the second accommodation recess 324.
FIG. 17 is an exploded perspective view of the mounting ring unit 310. As shown in FIG. 17, the attachment ring unit 310 includes an attachment ring 314 (an example of a connecting portion), a lock knob 311 (an example of a lock member), a lock spring 312 (an example of a regulation holding member), and a pair of attachment springs. 313 (an example of a pressing portion). The lock spring 312 is fixed to the lock knob 311. The attachment spring 313 is fixed to the attachment ring 314. The mounting ring unit 310 is rotatably supported by the exterior part 101 described above.
The mounting ring 314 is an annular member integrally formed of resin, and is rotatably supported by the rear case 320 described above. The attachment ring 314 has a cylindrical portion 314a, four fitting claws 310d (an example of a fitting claw), and an annular protrusion 314c.

The fitting claw 310d protrudes radially outward from the end of the cylindrical portion 314a. The fitting claws 310d are plate-like portions that are elongated in the circumferential direction. The four fitting claws 310d are arranged at equal intervals in the circumferential direction. When the 3D conversion lens 300 is attached to the video camera body 200, the fitting claw 310d is inserted into the insertion recess 410a of the front frame 410 and further fitted into the fitting groove 410c (an example of the fitting groove).
An annular protrusion 314c is provided on the opposite side of the tubular portion 314a from the fitting claw 310d. The annular projecting portion 314c projects outward in the radial direction from the end portion of the tubular portion 314a. A pair of attachment springs 313 are fixed to the annular protrusion 314c. The attachment spring 313 has a curved spring portion 313a. The attachment spring 313 functions as a pressing portion that presses the flange portion 103 of the exterior portion 101 against the front frame 410 when the 3D conversion lens 300 is attached to the video camera body 200 (see FIG. 30).

The mounting ring 314 further includes a first support plate 314b, a second support plate 314d, a first knob portion 310a (an example of a first knob portion), a second knob portion 310b (an example of a second knob portion), have. The first support plate 314b and the second support plate 314d protrude from the annular protrusion 314c in the Y-axis direction, and extend in the circumferential direction along the annular protrusion 314c. In order to facilitate the rotation operation of the attachment ring unit 310, the first support plate 314b and the second support plate 314d are provided with a first knob portion 310a and a second knob portion 310b, respectively.
The first knob part 310a and the second knob part 310b protrude from the first support plate 314b and the second support plate 314d to the outer peripheral side, respectively. A lock knob 311 is inserted into the first knob portion 310a from the inner peripheral side. In a state where the 3D conversion lens 300 is assembled, the lock knob 311 is pushed radially outward by the lock spring 312.

The lock knob 311 has a knob main body 311c, a protrusion 311a, and a lock projection 311b. A lock spring 312 is fixed to the knob body 311c. The protrusion 311a and the lock protrusion 311b protrude from the knob body 311c. A first through hole 310c and a second through hole 310e are formed in the first knob portion 310a. The protrusion 311a is inserted into the first through hole 310c. The lock protrusion 311b is inserted into the second through hole 310e.
FIG. 18A is a cross-sectional view of the mounting ring 314. As shown in FIG. 18A, the first knob portion 310a protrudes radially outward from the first support plate 314b. The second knob portion 310b protrudes radially outward from the second support plate 314d. The first through hole 310c is formed on the upper surface of the first knob portion 310a. The second through hole 310e is formed on the side surface of the first knob portion 310a. A part of the second through hole 310e is formed in the first support plate 314b.

FIG. 18B is a cross-sectional view of the mounting ring unit 310. The protrusion 311a of the lock knob 311 is inserted into the first through hole 310c. The protruding portion 311a protrudes outward from the first knob portion 310a. The lock protrusion 311b of the lock knob 311 is inserted into the second through hole 310e. In this state, the lock knob 311 is pressed radially outward by the lock spring 312.
FIG. 19A is a cross-sectional view taken along the line XIXA-XIXA in FIG. As shown in FIG. 19A, a lock knob 311 is accommodated in the first knob portion 310a. In consideration of operability, the second knob portion 310b is disposed on the opposite side of the first knob portion 310a with the rotation center C interposed therebetween. The first knob portion 310a is disposed at the center in the circumferential direction of the first support plate 314b. The second knob portion 310b is disposed at the center in the circumferential direction of the second support plate 314d. Since the first support plate 314b and the second support plate 314d are arranged at equal intervals in the circumferential direction, the first knob portion 310a and the second knob portion 310b are also arranged at equal intervals in the circumferential direction.

Further, in consideration of operability, the central portions of the first knob portion 310a and the second knob portion 310b are recessed in an arc shape. The first knob portion 310a and the second knob portion 310b have the same thickness as the first support plate 314b and the second support plate 314d, respectively, and the inside thereof is hollow. Therefore, the lock knob 311 can be disposed inside the first knob portion 310a.
FIG. 19B is a cross-sectional view taken along the line XIXB-XIXB in FIG. The four fitting claws 310d are arranged at equal intervals in the circumferential direction. As can be seen by comparing FIG. 19 (B) with FIG. 19 (A), the first knob portion 310a and the second knob portion 310b are arranged vertically with the fitting claws 310d arranged vertically and horizontally. Each fitting claw 310d is displaced in the circumferential direction.

When the components of the 3D conversion lens 300 described above are assembled, the state shown in FIG. 20 is obtained. FIG. 20 is a perspective view of the 3D conversion lens 300. FIG. 20 shows the unlocked state of the 3D conversion lens 300. Here, the unlocked state and the locked state of the 3D conversion lens 300 are defined. The unlocked state of the 3D conversion lens 300 refers to a state of the 3D conversion lens 300 in which the 3D conversion lens 300 can be attached to and detached from the video camera body 200. The locked state of the 3D conversion lens 300 means the same state as when the 3D conversion lens 300 is completely attached to the video camera body 200. The difference between the unlocked state and the locked state is the position of the mounting ring unit 310 in the rotational direction with respect to the exterior portion 101.
As shown in FIG. 20, the mounting ring unit 310 is disposed at the rear part of the 3D conversion lens 300. The attachment ring unit 310 is disposed inside the exterior part 101, and a part thereof is exposed to the outside from the exterior part 101. Specifically, the first knob portion 310a of the mounting ring unit 310 is exposed to the outside from the first opening 360a. Further, the mounting ring 314 protrudes outside through the flange portion 103, and the fitting claw 310d of the mounting ring 314 is exposed to the outside.

FIG. 21 is a partial perspective view of the 3D conversion lens 300 (partially enlarged view of FIG. 20). As shown in FIG. 21, a first index groove 360 g and a second index groove 360 b are formed on the outer surface of the top case 160. The first index groove 360g and the second index groove 360b are disposed on the subject side edge of the first opening 360a. The first index groove 360g corresponds to the unlocked state of the 3D conversion lens 300. The second index groove 360 b corresponds to the locked state of the 3D conversion lens 300.
When the 3D conversion lens 300 is in the unlocked state, the first knob portion 310a of the mounting ring unit 310 is disposed at the same circumferential position as the first index groove 360g. When the 3D conversion lens 300 is in the locked state, the first knob portion 310a is disposed at a substantially same circumferential position as the second index groove 360b. Thus, by checking whether the first knob portion 310a is arranged around the first indicator groove 360g or whether the first knob portion 310a is arranged around the second indicator groove 360b, The user can easily grasp the locked state and unlocked state of the 3D conversion lens 300.

FIG. 22 is a rear view of the 3D conversion lens 300. FIG. 22 shows the unlocked state of the 3D conversion lens 300. As shown in FIG. 22, the mounting ring unit 310 is rotatable within a predetermined angle range. The position in the rotation direction of the mounting ring unit 310 shown in FIG. The unlocking position P1 is determined based on the center of the first knob portion 310a in the circumferential direction. When the attachment ring unit 310 is rotated counterclockwise from the unlocking position P1, the 3D conversion lens 300 is in the locked state shown in FIG.
FIG. 23 is a rear view of the 3D conversion lens 300. FIG. 23 shows a locked state of the 3D conversion lens 300. A position in the rotation direction of the mounting ring unit 310 shown in FIG. 23 is defined as a lock position P2. Similar to the unlock position P1, the lock position P2 is determined based on the circumferential center of the first knob portion 310a. When fixing the 3D conversion lens 300 to the video camera body 200, the mounting ring unit 310 is rotated from the unlock position P1 to the lock position P2. On the other hand, when the attachment ring unit 310 is rotated clockwise from the lock position P2 to the lock release position P1, the 3D conversion lens 300 can be detached from the video camera body 200. Thus, the mounting ring unit 310 can rotate between the unlock position P1 and the lock position P2.

24 is a cross-sectional view taken along the line XXIV-XXIV in FIG. As shown in FIG. 24, the mounting ring unit 310 is disposed inside the bottom case 140 and the top case 160, and is disposed on the outer peripheral side of the rear case 320. The mounting ring unit 310 is rotatably supported by the bottom case 140, the top case 160, and the rear case 320.
The second case portion 322 of the rear case 320 is disposed on the inner peripheral side of the mounting ring 314 of the mounting ring unit 310 and slides with the inner peripheral surface of the mounting ring 314 when the mounting ring unit 310 rotates. The second case portion 322 and the cylindrical portion 314a pass through the flange portion 103 and protrude rearward (Y-axis direction negative side). The rib 324a is disposed on the inner peripheral side of the second support plate 314d, and rotatably supports the second support plate 314d.

The fitting claws 310d are arranged at substantially the same radial position as the contact surface 103a of the flange portion 103. The radial width of the contact surface 103a is substantially the same as the radial length of the fitting claw 310d. Since the radial width of the contact surface 103a is relatively small, when the top case 160 and the bottom case 140 are resin-molded, the draft of the portion corresponding to the contact surface 103a of the mold can be reduced. Therefore, the contact surface 103a can be formed substantially perpendicular to the rotation center C (or the optical axis A).
[2.3D conversion lens and video camera body installation work]
An operation for attaching the 3D conversion lens 100 having the above configuration to the video camera body 200 will be described.
FIG. 25 is a diagram for explaining the work of mounting the 3D conversion lens 300 on the video camera body 200. As shown in FIG. 25, before the 3D conversion lens 300 is mounted, the first knob portion 310a of the mounting ring unit 310 is set to the unlock position P1. With the mounting ring unit 310 in the unlocked position P1, the first protrusion 120b and the second protrusion 120c are inserted into the first hole 210b and the second hole 210c, respectively, and the four fitting claws 310d are inserted into the four insertion recesses 410a. Insert each one. Since the circumferential length L11 of the first protrusion 120b is different from the circumferential length L12 of the second protrusion 120c, the 3D conversion lens 300 is attached to the video camera body 200 as in the first embodiment. Can be prevented from being installed upside down.

FIG. 26A, FIG. 26B, and FIG. 26C are cross-sectional views of the 3D conversion lens 300 when the attachment ring unit 310 is disposed at the unlock position P1. In FIG. 26A, the 3D conversion lens 300 is cut so that the cross section of the protrusion 311a can be seen. FIG. 26B is a partial cross-sectional view around the lock projection 311b. In FIG. 26C, the 3D conversion lens 300 and the front frame 410 are cut so that cross sections of the fitting claws 310d and the claw fitting portions 410b can be seen. FIG. 26C shows the fitting claw 310d and the claw fitting portion in a state where the first protrusion 120b and the second protrusion 120c of the 3D conversion lens 300 are inserted into the first hole 210b and the second hole 210c, respectively. The positional relationship of the circumferential direction of 410b is shown.
As shown in FIG. 26A, the first knob portion 310a is exposed to the outside from the first opening 360a, and the second knob portion 310b is exposed to the outside from the second opening 340a. When the mounting ring unit 310 is disposed at the unlocking position P1, the first knob portion 310a abuts on the circumferential edge of the first opening 360a, and the second knob portion 310b is in the circumferential direction of the second opening 340a. It is in contact with the edge of. This facilitates positioning of the mounting ring unit 310 at the unlock position P1.

As shown in FIG. 26B, the lock projection 311 b is in contact with the inner peripheral surface of the top case 160. The top case 160 has a first recess 360e and a second recess 360f on the inner peripheral surface. The first concave portion 360e and the second concave portion 360f are arranged at intervals in the circumferential direction. The first recess 360e and the second recess 360f are arranged on a track through which the lock projection 311b passes when the mounting ring unit 310 rotates with respect to the top case 160.
When the attachment ring unit 310 is disposed at the unlock position P1, the tip of the lock projection 311b is fitted in the first recess 360e. Since the lock knob 311 is pressed against the top case 160 by the lock spring 312 in a state where the lock convex portion 311b is fitted in the first concave portion 360e, the rotation of the mounting ring unit 310 with respect to the exterior portion 101 is restricted by the lock knob 311. A position in the radial direction of the lock knob 311 in a state where the lock protrusion 311b is fitted in the first recess 360e is defined as a restriction position P31 (an example of a restriction position of the lock member) (see FIG. 26A).

When the protrusion 311a of the lock knob 311 is pushed from the outside, the lock knob 311 moves radially inward with respect to the first knob 310a, so that the fitting of the lock protrusion 311b into the first recess 360e can be released. The attachment ring unit 310 can be rotated with respect to the exterior portion 101.
As shown in FIG. 26C, the fitting claw 310d is inserted into the insertion recess 410a. When fixing the 3D conversion lens 300 to the video camera body 200, the mounting ring unit 310 is rotated counterclockwise. When the projection 311a is pushed in, the lock projection 311b is not fitted into the first recess 360e, and the attachment ring unit 310 can be rotated counterclockwise with respect to the exterior 101. When the attachment ring unit 310 is rotated counterclockwise while pushing the protrusion 311a, the 3D conversion lens 300 is in the state shown in FIGS. 27 (A), 27 (B), and 27 (C).

27A, 27B, and 27C are cross sections of the 3D conversion lens 300 when the 3D conversion lens 300 is disposed at an intermediate position between the unlock position P1 and the lock position P2. FIG. 27 (A), 27 (B), and 27 (C) are cross-sectional views at the same positions as those of FIGS. 26 (A), 26 (B), and 26 (C), respectively. .
As shown in FIG. 27A, the lock knob 311 is held in a pushed state. Even if the lock knob 311 is pushed in, the central portion of the lock spring 312 contacts the spring sliding surface 320a before the protrusion 311a enters the inside of the first through hole 310c, so that the protrusion 311a drops off from the first through hole 310c. Can be prevented.
As shown in FIG. 27B, when the mounting ring unit 310 is disposed at the intermediate position, the lock convex portion 311b is located between the first concave portion 360e and the second concave portion 360f of the top case 160 by the elastic force of the lock spring 312. The lock knob 311 is held in a pressed state. Therefore, the attachment ring unit 310 can be rotated without pressing the protrusion 311a. A radial position of the lock knob 311 in a state where the lock convex portion 311b is not fitted into the first concave portion 360e or the second concave portion 360f is defined as a restriction release position P32 (an example of a restriction release position of the lock member) (FIG. 27 (A)).

As shown in FIG. 27C, when the attachment ring unit 310 is rotated counterclockwise from the unlock position P1, the fitting claw 310d is gradually inserted into the fitting groove 410c. When the mounting ring unit 310 is rotated to the lock position P2, the 3D conversion lens 300 is in the locked state shown in FIGS. 28 (A), 28 (B), and 28 (C). FIGS. 28A, 28B, and 28C are cross-sectional views at the same positions as those of FIGS. 26A, 26B, and 26C, respectively.
As shown in FIG. 28 (A), when the mounting ring unit 310 is further rotated counterclockwise from the state shown in FIG. 27 (A), the first knob portion 310a and the circumferential edge of the first opening 360a The second knob portion 310b comes into contact with the circumferential edge of the second opening 340a. This facilitates positioning of the mounting ring unit 310 at the lock position P2.

When the mounting ring unit 310 rotates with respect to the top case 160, the first support plate 314b rotates with respect to the first opening 360a. However, since the circumferential length of the first support plate 314b is set to be sufficiently long, the first support plate 314b always covers the first opening 360a from the inside. Similarly, the second support plate 314d always covers the second opening 340a from the inside. As described above, the first support plate 314b and the second support plate 314d prevent foreign matters from entering the 3D conversion lens 300 from the first opening 360a and the second opening 340a.
As shown in FIG. 28 (B), when the mounting ring unit 310 reaches the lock position P2, the tip of the lock projection 311b is fitted into the second recess 360f, and the lock knob 311 is held at the regulation position P31 by the lock spring 312. The Since the lock knob 311 is pressed against the top case 160 by the lock spring 312 in a state where the lock convex portion 311b is fitted in the second concave portion 360f, the rotation of the mounting ring unit 310 relative to the exterior portion 101 is restricted by the lock knob 311.

As shown in FIG. 28C, when the attachment ring unit 310 rotates counterclockwise and reaches the lock position P2, the fitting claw 310d is completely fitted into the fitting groove 410c of the front frame 410.
When removing the 3D conversion lens 300 from the video camera body 200, the first knob portion 310a is rotated from the lock position P2 to the lock release position P1 while holding the lock knob 311 at the restriction release position P32 by pressing the protrusion 311a. Then, the fitting claw 310d is detached from the fitting groove 410c, and the fitting claw 310d reaches the insertion recess 410a. In this way, the 3D conversion lens 300 can be detached from the video camera body 200.
In FIG. 29, the fitting claw 310d is dropped into the partial development view of FIG. As shown in FIG. 29, when the fitting claw 310d is inserted into the fitting groove 410c, the fitting claw 310d slides on the guide surface 415b. Specifically, when the attachment ring unit 310 is rotated from the unlock position P1 to the lock position P2, the fitting claw 310d is gradually inserted into the fitting groove 410c while sliding with the guide surface 415b. At this time, the fitting claw 310d is guided toward the first side surface 416 by the guide surface 415b, and the attachment ring 314 is pulled toward the front frame 410. Thereafter, the fitting claw 310d is inserted to the second end E2 while sliding with the support surface 415a.

FIG. 30 shows a cross-sectional view around the 3D conversion lens 300 and the attachment spring 313 of the front frame 410. FIG. 30 shows a state where the 3D conversion lens 300 is completely attached to the video camera body 200. As shown in FIG. 30, when the attachment ring 314 is pulled toward the front frame 410, the spring portion 313 a of the attachment spring 313 is compressed between the flange portion 103 of the exterior portion 101 and the attachment ring 314. Due to the elastic force of the spring portion 313a, the flange portion 103 is pressed against the claw fitting portion 410b of the front frame 410 in the Y-axis direction (optical axis direction), and the claw fitting portion is interposed between the flange portion 103 and the fitting claw 310d. Part of 410b is sandwiched. With these configurations, the exterior portion 101 that accommodates the lens unit 130 can be attached to the video camera body 200 with little backlash, and the 3D conversion lens 300 can be accurately attached to the video camera body 200 in the Y-axis direction. Can be installed well.

[Features of 3.3D Conversion Lens 300]
The characteristics of the 3D conversion lens 300 described above are summarized below.
(1) In this 3D conversion lens 300, the exterior portion 101 is attached to the video camera body 200 in the Y-axis direction (optical axis) while the exterior portion 101 is attached to the video camera body 200 by the mounting ring unit 310. In the direction) by the mounting ring unit 310. Therefore, the position of the exterior portion 101 in the Y-axis direction with respect to the video camera body 200 is stable, and the 3D conversion lens 300 can be attached to the video camera body 200 with high accuracy in the Y-axis direction.
(2) Since the attachment ring unit 310 has the fitting claw 310d and the attachment spring 313, the fitting spring 313 is fitted by fitting the fitting claw 310d into the fitting groove 410c of the front frame 410 of the video camera body 200. Comes into contact with the exterior portion 101 (more specifically, the flange portion 103) in the Y-axis direction, and the exterior portion 101 is pressed against the video camera body 200 by the elastic force of the mounting spring 313. Therefore, the 3D conversion lens 300 can be accurately attached to the video camera body 200 with a simple configuration.

Further, since the flange portion 103 is sandwiched between the attachment spring 313 and the video camera body 200, the posture of the 3D conversion lens 100 with respect to the video camera body 200 is easily stabilized.
(3) Since the second knob portion 310b is disposed on the substantially opposite side of the first knob portion 310a across the rotation center C of the attachment ring unit 310, the user can easily rotate the attachment ring unit 310.
[Other Embodiments]
The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the scope of the present invention.
(1) In the above-described embodiment, the imaging apparatus to which the 3D adapter is attached has been described using the video camera body 200 as an example. However, the imaging apparatus is not limited to the video camera body 200 that mainly performs moving image shooting. For example, the imaging device may be a still camera that mainly performs still image shooting.

(2) In the above-described embodiment, the 3D adapter is described using the 3D conversion lens 100 as an example, but the configuration of the 3D adapter is not limited to the 3D conversion lens 100. The 3D adapter includes a first optical system that guides light for forming the left-eye optical image to the main body optical system to the imaging apparatus, and a second optical system that guides light for forming the right-eye optical image to the main body optical system. As long as it has.
(3) The flange portion 103 has an abutting surface 103a arranged at a position farther from the optical axis A than the connecting portion 111, but the abutting portion takes an image at a position closer to the optical axis A than the connecting portion. It may be in contact with the device.
(4) In the above-described embodiment, the first protrusion 120b and the second protrusion 120c are inserted into the first hole 210b and the second hole 210c of the video camera body 200, but the first hole 210b and the second hole 210c It is also conceivable to use the opening 210e of the front frame 210 instead. For example, as shown in FIGS. 31 and 32, the rear case 120 includes a first protrusion 320b corresponding to the first protrusion 120b, a second protrusion 320c corresponding to the second protrusion 120c, a third protrusion 320d, 4 projections 320e. The first protrusion 320b, the second protrusion 320c, the third protrusion 320d, and the fourth protrusion 320e protrude from the rear case main body 121 in the Y-axis direction. As shown in FIG. 32, the first protrusion 320b, the second protrusion 320c, the third protrusion 320d, and the fourth protrusion 320e are arranged on the left and right and up and down, and are inserted into the opening 210e. In this case, the first protrusion 320b, the second protrusion 320c, the third protrusion 320d, and the fourth protrusion 320e are in contact with the inner surface of the opening 210e, whereby the rotation direction of the 3D conversion lens 100 with respect to the video camera body 200 and the radial direction are determined. Positioning is performed. By adopting such a configuration, it is not necessary to form the first hole 210b and the second hole 210c in the video camera body 200, and the versatility of the 3D conversion lens 100 is enhanced.

(5) In the third embodiment described above, the attachment member is described using the attachment ring unit 310, but the configuration of the attachment member is not limited to the attachment ring unit 310.
For example, the 3D conversion lens 100 is configured to be pressed against the front frame 410 by using the elastic force of the mounting spring 313, but the same is true even if the rigidity of the mounting ring 314 itself is used without providing the mounting spring 313. An effect can be obtained. As shown in FIG. 33, the annular protrusion 314c of the mounting ring 314 is brought into direct contact with the flange portion 103 of the exterior portion 101 in the Y-axis direction, and the 3D conversion lens 100 is attached to the front frame 410 by the elastic force of the mounting ring 314. You may make it press.
Moreover, although the attachment ring 314 is comprised from the single member integrally formed, you may be comprised from the several member. It is only necessary that at least one fitting claw 310d and claw fitting portion 410b are provided.

Furthermore, although a mechanism for locking the rotational position of the attachment ring unit 310 is provided in the 3D conversion lens 300, the lock knob 311 may be omitted.
(6) In the third embodiment described above, the mounting ring unit 310 has the first knob portion 310a and the second knob portion 310b, but either one of the first knob portion 310a and the second knob portion 310b. Only may be provided. Further, in addition to the first knob portion 310a and the second knob portion 310b, the mounting ring unit 310 may further include portions such as the first knob portion 310a and the second knob portion 310b.
Further, the second knob portion 310b may not be provided on the opposite side of the first knob portion 310a across the rotation center C of the mounting ring unit 310, and the circumferential position of the second knob portion 310b is not shown. It may be shifted in the circumferential direction from the position shown in FIG.

The technology described above can be applied to a 3D adapter that can be attached to an imaging apparatus.

100 3D conversion lens (example of 3D adapter)
101 Exterior (example of housing)
102 Main body (an example of a housing main body)
103 Flange (an example of a contact part)
103a Contact surface (an example of a contact surface)
110 Mounting ring (an example of a mounting member)
110a Mounting screw (an example of mounting screw)
110d pressure surface 111 connecting part (an example of a connecting part)
112 pressing part (an example of a pressing part)
113 grip part 120 rear case 120b 1st protrusion (an example of a control part, an example of a 1st positioning part, an example of a convex part)
120c 2nd protrusion (an example of a control part, an example of a 2nd positioning part, an example of a convex part)
130 Lens unit 140 Bottom case 150 Front case 160 Top case 200 Video camera body (an example of an imaging device)
210 Front frame 210a Support screw part (an example of a support screw part)
210b 1st hole (an example of a body recess)
210c 2nd hole (example of main body recess)
210d Front 220 Main body optical system (an example of main body optical system)
300 3D conversion lens (example of 3D adapter)
310 Mounting ring unit (an example of a mounting member)
310a 1st knob part (an example of the 1st knob part)
310b Second knob (an example of the second knob)
310c first through hole 310d fitting claw (an example of a fitting claw)
310e Second through hole 311 Lock knob (an example of a lock member)
312 Lock spring (an example of a restriction holding member)
313 Mounting spring (an example of a pressing part)
314 Mounting ring (example of connecting part)
360a 1st opening (an example of the 1st opening)
340a Second opening (an example of a second opening)
410 Front frame 410a Insertion recessed part 410b Claw fitting part 410c Fitting groove (an example of a fitting groove)
P1 Lock release position P2 Lock position P31 Restriction position (an example of restriction position)
P32 Restriction release position (example of restriction release position)

Claims (16)

1. A 3D adapter that can be attached to an imaging device having a main body optical system,
   A first optical system for guiding light for forming a left-eye optical image to the main body optical system;
   A second optical system for guiding light for forming a right-eye optical image to the main body optical system;
   A housing that supports the first and second optical systems;
   An attachment member for attaching the housing to the imaging device,
   In a state where the housing is attached to the imaging device by the attachment member, the housing is pressed against the imaging device by the attachment member in an optical axis direction parallel to the optical axis of the main body optical system. Being
   3D adapter.
2. The mounting member includes a connecting portion provided so as to be connectable to the imaging device, and a pressing portion disposed so as to be able to contact the housing in the optical axis direction.
   The 3D adapter according to claim 1.
3. The housing includes a contact portion disposed so as to be able to contact the imaging device in the optical axis direction,
   The contact portion is sandwiched between the pressing portion and the imaging device in a state where the connecting portion is connected to the imaging device.
   The 3D adapter according to claim 2.
4. The contact portion has a contact surface arranged to be able to contact the imaging device in the optical axis direction,
   The contact surface is disposed on the outer peripheral side with respect to the connecting portion.
   The 3D adapter according to claim 3.
5. The mounting member is supported by the housing so as to be rotatable around the optical axis,
   The connecting portion has an attachment screw portion that is screwed into a support screw portion of the imaging device when the attachment member is attached to the imaging device.
   The 3D adapter according to claim 3 or 4.
6. The mounting member is supported by the housing so as to be rotatable around the optical axis,
   The connecting portion has at least one fitting claw inserted in a circumferential direction into a fitting groove of the imaging device when the attachment member is attached to the imaging device.
   The 3D adapter according to claim 3 or 4.
7. The housing has a first opening;
   The mounting member has a first knob portion that is inserted into the first opening and exposed to the outside.
   The 3D adapter according to claim 6.
8. The housing has a second opening;
   The mounting member has a second knob portion that is inserted into the second opening and exposed to the outside.
   The 3D adapter according to claim 7.
9. The second knob portion is disposed on the substantially opposite side of the first knob portion across the rotation center of the mounting member.
   The 3D adapter according to claim 8.
10. A lock member arranged to be movable between a restriction position that restricts rotation of the attachment member relative to the housing and a restriction release position that permits rotation of the attachment member relative to the housing;
    A restriction holding member for holding the lock member at the restriction position;
    The 3D adapter according to any one of claims 6 to 9.
11. The housing is disposed so as to be in contact with the imaging device in a rotation direction around the optical axis and a housing body that supports the first and second optical systems, and the light of the housing body with respect to the imaging device A restricting portion provided to be capable of restricting rotation around the axis,
    The 3D adapter according to any one of claims 1 to 10.
12. The restricting portion is disposed so as to be able to contact the imaging device in a radial direction orthogonal to the optical axis, and is provided so as to be able to restrict movement of the housing body in the radial direction relative to the imaging device. ,
    The 3D adapter according to claim 11.
13. The restricting portion is at least one of a convex portion that protrudes from the housing body in the optical axis direction and can be inserted into a main body concave portion of the imaging device, and a concave portion that has a hole into which the main body convex portion of the imaging device is inserted. Have one,
    The 3D adapter according to claim 11 or 12.
14. The restricting portion includes a first positioning portion that protrudes from the housing body in the optical axis direction, and a second positioning portion that protrudes from the housing body in the optical axis direction,
    The shape of the first positioning portion is different from the shape of the second positioning portion.
    The 3D adapter according to claim 11.
15. The length of the first positioning portion in the circumferential direction around the optical axis is different from the length in the circumferential direction of the second positioning portion,
    The 3D adapter according to claim 14.
16. The length of the first positioning portion in the optical axis direction is different from the length of the second positioning portion in the optical axis direction.
    The 3D adapter according to claim 14 or 15.

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