JPH10191111A - Image display device and optical path extension device for video camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display device and an optical path extension device for a video camera where expensive components such as a CRT and an eyepiece lens are not required to be arranged in duplicate and to apply a shoulder-mount view finder even to a video camera composed integrally with a camera main body. SOLUTION: A view finder 500 has an image display part 510 to display a pickled-up image of an ENG camera, and optical path extension part 520 to extend an optical path of a luminous flux emitted from the image display part 510 to a rear part of a camera main body 100 and an eyepiece part 530 for expending and viewing a picked-up image displayed on the image display part 510. The optical path extension part 520 is composed so as to be attachable and detachable mounted to and from the image display part 510 so as to extend and contract in a direction of an optical path of the luminous flux emitted from the image display part 510.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device provided in a video camera for displaying images taken by the video camera. The present invention also relates to an optical path extending device for extending the optical path of a light beam output from the image display means of the image display device. Here, the video camera refers to an imaging system in which the camera is integrated. As this video camera, for example, there is a video tape recorder in which the camera is integrated.

[0002]

2. Description of the Related Art Generally, a video camera for capturing a moving image includes an image display device for displaying a captured image,
A so-called view finder is provided. The user shoots a target subject while viewing the shot image displayed by the viewfinder.

[0003] A video camera (hereinafter referred to as an "ENG camera") used for news gathering or the like is used with the camera body resting on the shoulder of the user. For this reason,
The viewfinder of the ENG camera is configured such that an eyepiece (hereinafter, referred to as an "eyepiece") comes to the position of the user's eyes when the camera body is placed on the shoulder of the user.

This will be described with reference to FIG. FIG. 17 is a side view showing an example of the external configuration of the ENG camera described above. The illustrated ENG camera is a camera body 10.
, A photographing lens unit 20, and a viewfinder 30.

[0005] At the center of the lower portion of the camera body 10, a shoulder rest portion 40 for placing the camera body 10 on a user's shoulder is formed. The viewfinder 30 is arranged so that the eyepiece 31 is located at the center of the upper part of the camera body 10.

According to such a configuration, the camera body 10
Is placed on the shoulder of the user, the eyepiece 31 comes to the position of the eyes of the user. This allows the user to take a picture in a natural posture without bending the neck back and forth.

However, in such a configuration, EN
When the G camera is mounted on a tripod or the like, that is, when the ENG camera is used like a video camera for a studio, there is a problem that it is difficult to shoot.
This is because the user must take a picture in an unnatural posture because the tripod legs are in the way.

In order to solve this problem, conventionally, a viewfinder for using an ENG camera on a shoulder and a viewfinder for using on a tripod have been prepared as viewfinders. And used them properly.

[0009]

However, such a configuration can be applied to an ENG camera in which a viewfinder for shoulder mounting is configured to be detachable from the camera body. There is a problem that it cannot be applied to an ENG camera that is integrally configured.

Further, in such a configuration, expensive parts such as a picture tube (hereinafter, referred to as a "CRT") and an eyepiece constituting the viewfinder must be doubled, so that the burden on the user is large. There was a problem of becoming.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and its object is to apply the present invention to an ENG camera in which a viewfinder for shoulder mounting is integrally formed with a camera body, and a CRT. It is an object of the present invention to provide an image display device and an optical path extending device for a video camera, which do not require double arrangement of expensive components such as a camera and an eyepiece.

[0012]

According to the present invention, there is provided an image display device, comprising: an image display means for displaying an image taken by a video camera; and an optical path extending means for extending an optical path of a light beam emitted from the image display means. The optical path extending means is detachably attached to the image display means.

In such a configuration, when the ENG camera is used on a shoulder, the optical path extending means is removed from the image display means. Thus, in this case, the eyepiece is positioned at the position of the user's eyes when the ENG camera is placed on the shoulder. On the other hand, when the ENG camera is used on a tripod, the optical path extending means is attached to the image display means. Thereby, in this case, the eyepiece portion is positioned at the position of the eyes of the user standing on the rear portion of the camera body. As a result, the user can take a picture in a natural posture in either case.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the following description, a case where the present invention is applied to a viewfinder of an ENG camera will be described as a representative.

First, a first embodiment of the present invention will be described. FIG. 1 is a side view showing an external configuration of the present embodiment. FIG. 1 shows the overall configuration of an ENG camera including the viewfinder of the present embodiment.

The illustrated ENG camera records video signals,
A camera body 100 having a reproduction function and the like, and a shoulder rest part 200 for resting the camera body 100 on a shoulder of a user
A photographing lens unit 300 for capturing a subject image;
A handle 400 for holding the camera body 100 and a viewfinder 50 for displaying an image captured by the ENG camera.
0.

The shoulder rest 200 is provided at the center of the lower part of the camera body 100. The photographing optical unit 300 is provided at the front of the camera body 100. The handle 400
It is provided on the upper part of the camera body 100. The viewfinder 500 is provided, for example, on the upper right side of the camera body 100.

The viewfinder 500 includes an image display unit 510 for displaying an image captured by an ENG camera,
An optical path extending section 52 for extending the optical path of the light beam emitted from the image display section 510 to the rear of the camera body 100
0 and an eyepiece section 530 for the user to visually observe the captured image displayed by the image display section 510 on an enlarged scale.

The image display unit 510 includes a CRT 511 (see FIG. 4 described later) for displaying an image captured by the ENG camera, and a reflecting mirror 512 (see FIG. 4 described later) that reflects a light beam emitted from the CRT 511. , These CRTs
CRT storage section 5 for storing 511 and reflector 512
13 (see FIG. 4 described later).

The optical path extending section 520 includes an image display section 5.
It is configured so that it can be detachably attached to the device 10.
The optical path extending section 520 includes an optical system 521 (see FIG. 2 described later) for guiding the optical path of the light beam emitted from the CRT 511 to the rear of the camera body 100, and the optical system 521.
And a lens barrel 522 for housing the lens.

The eyepiece section 530 is configured to be detachably attached to the image display section 510 and the optical path extending section 520. That is, the eyepiece part 530
Is mounted on the image display unit 510 when the camera body 100 is used on the shoulder of the user, and is mounted on the optical path extending unit 520 when used on the tripod 600. The eyepiece 530 is provided with an eyepiece 53 for enlarging a captured image displayed by the CRT 511.
1 (see FIG. 2 described later), a lens barrel 532 for accommodating the eyepiece 531, and a protection section 533 for protecting the eyes of the user.

In the above configuration, the image display unit 5
The image display unit 510, the optical path extending unit 520, and the eyepiece unit 530 constitute a viewfinder for mounting on a tripod.

FIG. 2 shows an optical system 521 of the optical path extending section 520.
FIG. 14 is an optical path diagram showing a configuration of an eyepiece 531 of the eyepiece unit 530 and an eyepiece unit 530.

The illustrated optical system 521 includes first and second relay lenses 1A and 2A for relaying a light beam emitted from the CRT 511 (see FIG. 4) and a second relay lens 2A.
A erect prism 3A for inverting the light beam emitted from A, up, down, left and right, respectively, and a field lens 4 for imaging the light beam emitted from the erect prism 3A.
A. Here, regarding the erecting prism 3A,
This is not the actual thickness of the prism 3A, but the actual length through which light passes.

In FIG. 2, B1 is the CRT 51
A photographed image (hereinafter, referred to as “first image”) displayed on the image plane 1 is shown, and B2 is a photographed image formed through the field lens 4A (hereinafter, referred to as “second image”). , B3 indicate the pupil of the user.

The first relay lens 1A and the second relay lens 2A constitute a tandem optical system. That is, the first relay lens 1A is disposed such that the image plane of the CRT 511 is located at the focal point. Thereby, CRT5
The light beam emitted from the first relay lens 1
After being converted into a parallel light beam by A, the light is incident on the second relay lens 2A. Here, the first relay lens 1A
Constitutes the first optical system of the present invention.

The second relay lens 2A, the erect prism 3A, and the field lens 4A have a function of forming the first image B1 as the second image B2. They are,
A second optical system according to the present invention is configured.

The first relay lens A is, for example,
The second relay lens 2A includes a convex lens 1a, a concave lens 2b, and a convex lens 1a, a concave lens 2a, and a convex lens 3a. The eyepiece 531 includes convex lenses 1c and 3c and a concave lens 2c.

FIG. 3 is an optical path diagram showing an example of the erect prism 3A. The figure shows an erect prism called Dahpechan. Here, FIG. 3A is a view of the erecting prism 3A, for example, viewed from the side, and FIG.
Is a diagram viewed from the front, for example. As shown in FIG. 3A, the illustrated erect prism 3A has five reflecting surfaces to and two upper roof-shaped reflecting surfaces forming an angle of 90 °.

In such a configuration, the light beam incident on the erect prism 3A is reflected an odd number of times by the five reflecting surfaces shown in FIG. Thereby, the incident light beam is emitted upside down. The incident light beam is reflected by the two reflecting surfaces shown in FIG. Thereby, the incident light beam is emitted with its left and right reversed.

FIG. 4 shows the lens barrel 522 of the optical path extending part 520.
5 is a side sectional view showing the configuration of the eyepiece section 530 and the configuration of FIG. However, in FIG. 4, diagonal lines indicating a cross section are omitted to avoid complicating the drawing.

The illustrated lens barrel 522 has three cylindrical lens barrels 1C, 2C and 3C having different diameters. Here, one end of the first lens barrel 1C having the largest diameter is attached to a CRT.
Attachment part 4 for detachably attaching to storage part 513
C is provided. The attachment portion 4C is configured such that, for example, after inserting the end of the CRT storage portion 512 therein, the first barrel 1C can be attached to the CRT storage portion 512 by a one-touch operation of simply rotating. ing.

The second lens barrel 2C having the smallest diameter is
It is disposed coaxially with the first lens barrel 1C, and is fixed to one end of the lens barrel 1C inside the lens barrel 1C. The above-mentioned first relay lens 1A (first optical system) is housed inside the second lens barrel 2C.

A third lens barrel 3C having the second largest diameter
Is arranged coaxially with the first lens barrel 1C and is held by the first lens barrel 1C so as to be slidable in the axial direction. By this sliding operation, the optical path extending portion 520 can be expanded and contracted in the optical path direction. The above-mentioned second relay lens 2A, erect prism 3A and field lens 4A are housed in the center of the third lens barrel 3C.

As will be described later in detail, projections 5C and 6C for preventing the third lens barrel 3C from dropping from the first lens barrel 1C are provided on the outer surface of the third lens barrel 3C. Have been. Further, an eyepiece storage section 7C for storing the eyepiece section 530 is provided at the other end of the third lens barrel 3C.
Are formed. The diameter of the eyepiece storage section 7C is
The diameter is set to be substantially the same as the diameter of the first lens barrel 1C. As a result, although the details will be described later, the first lens barrel 1C
The maximum insertion position of the third lens barrel 3C with respect to is defined.

Eyepiece 531 of eyepiece 530
Are stored in a lens barrel 532. The lens barrel 532 is provided with a protection section 533. Also, this lens barrel 5
32 is provided with a mounting section 534 for mounting the eyepiece section 530 to the image display section 510 or the optical path extending section 520. The attachment section 534 is also configured such that, for example, the eyepiece section 530 can be attached to the image display section 510 or the optical path extension section 520 by one-touch operation, similarly to the attachment section 4C described above.

In the above configuration, a method of using the viewfinder 500 according to the present embodiment will be described first with reference to FIG.

In FIG. 1, when the ENG camera is used on a shoulder, the eyepiece 53 is displayed on the image display section 510.
0 is attached. The image display unit 51 is attached inside the attachment unit 534 of the eyepiece unit 530 shown in FIG.
After inserting the end of the CRT storage part 513 of No. 0, the attachment part 534 is rotated. With this attachment, in this case, the eyepiece portion 530 is located at the position of the eye when the ENG camera is placed on the shoulder. As a result, the user can monitor the captured image in a natural posture.

On the other hand, when the ENG camera is used on a tripod 600, an optical path extending section 520 is attached to the image display section 510 as shown in FIG. This attachment is performed by inserting the end of the CRT storage unit 513 of the image display unit 510 into the inside of the attachment unit 4C of the optical path extension unit 520 shown in FIG. 4, and then rotating the attachment unit 4C. In this case, the eyepiece section 530 is attached to the optical path extending section 520. This attachment is performed by inserting the end of the eyepiece storage portion 7C of the optical path extending portion 520 into the attachment portion 534 of the eyepiece portion 530 shown in FIG. 4 and rotating the attachment portion 534. With this attachment, the optical path of the light beam emitted from the CRT 511 is extended to the rear part of the camera body 100. As a result, the user can monitor the photographed image in a natural posture because the tripod legs do not interfere.

Next, referring to FIG.
The operation of the twenty optical system 521 will be described.

In FIG. 2, CRT 511 (see FIG. 4)
After being reflected by the reflecting mirror 512,
The light enters the erect prism 3A via the relay lenses 1A and 2A. The light beam incident on the erecting prism 3A is turned upside down and left and right, and then imaged by the field lens 4A. As a result, the second image 2B having the same vertical and horizontal directions as the first image B1 is formed behind the field lens 4A, and displacement of the optical axis is prevented. This second image 2B is
After that, the light enters the pupil B3 of the user. As a result, the captured image is visually viewed by the user in an enlarged manner.

In this case, the image plane 1B of the CRT 511 is located at the focal point of the first relay lens 2A as described above. Thereby, the light beam emitted from the CRT 511 is converted into a parallel light beam by the first relay lens 1A, and then is incident on the second relay lens 2A. Therefore, even if the distance between the relay lenses 1A and 2A is changed, the second
It is not necessary to change the relative positions of the optical elements (the second relay lens 2A, the erect prism 3A, and the field lens 4A) of the optical system. Also, no significant aberration deterioration occurs in the second image 2B. Thus, in the present embodiment, there is no problem even if the optical path extending portion 520 is expanded and contracted.

Next, the operation of expanding and contracting the optical path extending section 520 will be described with reference to FIGS.

This expansion and contraction operation is performed by sliding the third lens barrel 3C in the axial direction. That is, when shortening the optical path extending portion 520, the third lens barrel 3C is slid in a direction approaching the image display portion 510 (leftward in the figure). Thereby, the interval between the two relay lenses 1A and 2A is reduced. As a result, the optical path extending section 520 is shortened in the optical path direction. This shortening is possible until the eyepiece storage section 7C abuts on the first lens barrel 1C. FIG. 4 shows a state in which the optical path extending section 520 is shortened until the eyepiece storage section 7C abuts on the first lens barrel 1C.

On the other hand, when extending the optical path extending section 520, the third lens barrel 3C is slid in a direction away from the image display section 510 (to the right in the figure). This allows
The interval between the two relay lenses 1A and 2A is extended. As a result, the optical path extending section 520 is extended in the optical path direction. This extension is caused by the protrusion 5 provided on the outer surface of the third lens barrel 3C.
This is possible until C and 6C engage with holes (not shown) provided in the first lens barrel 1C. This engagement prevents the third lens barrel 3C from falling off from the first lens barrel 1C. FIG. 5 shows a state where the optical path extending portion 520 is extended until the protrusions 5C and 6C engage with holes provided in the first lens barrel 1C.

FIG. 4 shows a typical case where the distance between the relay lenses 1A and 2A is set to 40 mm when the optical path extending portion 520 is shortened to the shortest.
FIG. 5 shows the interval between the relay lenses 1A and 2A when the optical path extending unit 520 is extended to the longest.
The case where the distance is set to 60 mm is shown as a representative. Thereby, in the examples shown in FIGS. 4 and 5, the optical path extending portion can be extended up to 120 mm.

Next, the aberration of the optical system 521 of the optical path extending section 520 will be described with reference to FIGS.

FIG. 6 is a diagram showing an example of optical data of the optical system 521. In the figure, sn indicates the surface number of the lens, r indicates the radius of curvature, d indicates the thickness of the lens,
Alternatively, it indicates the distance between the lenses, and nd indicates the refractive index at the spectral d-line. νd indicates the Abbe number. Here, the variable range of d having a surface number sn of 6 is 40 mm to 16 mm.
0 mm. The Abbe number νd is given by νd = (nd−1) / (nF−nC), where nF is the refractive index at the F line and nC is the refractive index at the C line.

FIGS. 7 to 9 show the first relay lens 1 when the optical data shown in FIG. 6 is set.
A and the distance between the second relay lens 2A are 40 mm and 100 mm.
mm and 160 mm are shown.

In each figure, (a) shows the vertical aberration (hereinafter referred to as “Y direction”) top aberration DY when the center position is 0.75 of the diagonal of CRT 511. Here, the horizontal axis represents the distance from the center position, and the vertical axis represents the coma aberration DY (unit: mm). (B) CRT51
The coma aberration DX in the horizontal direction (hereinafter, referred to as “X direction”) when the position of 0.75 of the diagonal of 1 is set as the center position is shown.
Here, the horizontal axis indicates the distance from the center position, and the vertical axis indicates the coma aberration DX (unit: mm). (C) shows the coma aberration DY in the Y direction when the center position is on the optical axis. Here, the horizontal axis represents the distance from the center position, and the vertical axis represents the coma aberration DY (unit: mm). (D) shows the coma aberration DX in the X direction when the center position is on the optical axis. Here, the horizontal axis indicates the distance from the center position, and the vertical axis indicates the coma aberration DX (unit: mm). In (a) to (d), 1, 2, and 3 indicate spectral lines d, F, and C, respectively.

(E) shows the spherical aberration SA. here,
The vertical axis indicates the distance from the optical axis, and the horizontal axis indicates the spherical aberration SA.
(Unit is mm). (F) shows astigmatism AS. Here, the horizontal axis indicates the distance from the optical axis, and the vertical axis indicates
The astigmatism AS (unit: mm) is shown. T represents the tangent shell direction (circumferential direction), and S represents the sagittal direction (direction orthogonal to the circumferential direction). (G) shows the distortion DIST. Here, the vertical axis indicates the distance from the optical axis, and the horizontal axis indicates the aberration (unit:%).

7 to 9, in the example of FIG.
It can be seen that the aberration of the optical system 521 does not greatly change even if the distance between the first relay lens 1A and the second relay lens 2A is changed.

Next, a specific example of the eyepiece 531 will be described. FIG. 10 is an enlarged view of the eyepiece 531. However, in FIG. 10, unlike FIG. 2, the left side shows the position of the user's pupil B3 and the right side shows the second image B2. FIG. 11 is a diagram showing an example of optical data of the eyepiece 5A. In FIG. 11, various symbols are
Since the symbols are the same as those shown in FIG. 2, detailed description is omitted.

According to the embodiment described above, the following effects can be obtained.

(1) First, according to the present embodiment, the viewfinder 500 is connected to the image display section 510 and the optical path extending section 5.
20, the optical path extending unit 520 is configured to be detachably attachable to the image display unit 510, so that the present invention can be applied to an ENG camera in which a viewfinder for shoulder mounting is integrally formed with the camera body. While being able to
An advantage is obtained that expensive components such as the CRT 511 and the eyepiece 531 do not have to be doubled.

(2) Also, according to the present embodiment, the optical path extending portion 520 can be expanded and contracted, so that the camera body 100
The height of the eyepiece section 530 can be kept from changing so much even when a tilt operation of rotating up and down is performed.

That is, one end (the end on the image display section 510 side) of the viewfinder 500 for mounting on a tripod is normally rotatably supported by the camera body 100. However, the viewfinder 500 cannot stand alone because of the large number of optical elements and the like.

To cope with this problem, the other end of the viewfinder 500 may be supported. As this method, a method of supporting the other end of the viewfinder 500 on the camera body 100 and a method of supporting the other end of the viewfinder 500 on the tripod 600 can be considered.

However, if the other end of the viewfinder 500 is supported by the camera body 100, when a tilt operation for rotating the camera body 100 up and down is performed,
The height of the eyepiece 530 changes greatly. On the other hand, if the other end of the viewfinder 500 is supported by the tripod 600, such a problem does not occur.

However, in this case, since the length of the viewfinder 500 and the supporting device is fixed, the range of the rotation angle of the camera body 100 is restricted. To cope with this problem, a function of absorbing the rotation of the camera body 100 in the tilt direction may be provided.

Therefore, in the present embodiment, the viewfinder 500 is configured to be able to expand and contract.
According to such a configuration, the rotation of the camera body 100 in the tilt direction can be absorbed by configuring the support device to be extendable and contractible. Thereby, the camera body 100
Even if is rotated in the tilt direction, the height of the eyepiece 530 can be prevented from changing much.

(3) According to the present embodiment, two relay lenses 1A and 2A are provided, and the image plane of the CRT 511 is arranged at the focal point of one relay lens 1A to form a tandem optical system. So, CRT
Even if the optical path of the light beam emitted from the light beam 511 is expanded or contracted, it is possible to prevent a change in image magnification, a blur of an image, and the like from occurring.

Next, a second embodiment of the present invention will be described.

This embodiment is characterized in the configuration of the optical system of the optical path extending unit. That is, in the above embodiment, the first relay lens 1A is replaced with three lenses 1a, 2a, 3a.
Has been described. On the other hand, in the present embodiment, this is constituted by two lenses.

FIG. 12 is a diagram showing a configuration of a main part of the present embodiment. That is, it is a diagram illustrating the configuration of the optical system of the optical path extending unit. In FIG. 12, portions that perform substantially the same functions as those in FIG. 2 are given the same reference numerals, and detailed descriptions thereof will be omitted.

As shown, in the present embodiment, the first relay lens 1A is composed of a concave lens 1d and a convex lens 2d.
Consists of two lenses. Even in such a configuration, CR
The light beam emitted from T511 is the first relay lens 1
After being converted into a parallel light beam by A, the light is incident on the second relay lens 2A. As a result, even if the optical path extending portion 520 is expanded or contracted, a change in image magnification, blurring of an image, or the like does not occur.

FIG. 13 is a diagram showing an example of optical data of the optical system 521 shown in FIG. Here, the reference numerals shown in FIG. 13 are the same as those shown in FIG. In FIG. 13, the variable range of d having a surface number sn of 4 is 40 mm to 40 mm.
140 mm.

FIGS. 14 to 16 show that the distance between the first relay lens 1A and the second relay lens 2A is 40 m when the optical data shown in FIG. 13 is set.
The respective aberrations when set to m, 100 mm, and 160 mm are shown. Here, the reference numerals shown in FIGS. 14 to 16 are the same as those shown in FIGS. 7 to 9.

In the present embodiment described in detail above, the same effects as in the previous embodiment can be obtained.

Although the two embodiments of the present invention have been described in detail, the present invention is not limited to the above-described embodiments.

For example, in the above embodiment, a case has been described in which the present invention is applied to a viewfinder of a shoulder-mounted ENG camera. However, the present invention provides a shoulder-mounted E
The present invention can also be applied to a viewfinder of a video camera other than the NG camera.

Further, in the above-described embodiment, the case where the present invention is applied to the viewfinder of the video camera which shoots a moving image has been described. However, the present invention can also be applied to a viewfinder of a video camera (electronic still camera) that captures a still image.

In addition, it goes without saying that the present invention can be variously modified and implemented without departing from the scope of the invention.

[0074]

As described in detail above, according to the video camera image display device according to the first and fifth aspects and the video camera optical path extending device according to the sixth and tenth aspects, the image display device is provided with image display means. Divided into optical path extending means and configured so that the optical path extending means can be detachably attached to the image display means, so it can be applied to ENG cameras in which the image display device for shoulder mounting is integrated with the camera body. And the advantage that expensive components such as CRTs and eyepieces do not have to be doubled.

According to the image display device for a video camera according to the second aspect and the optical path extending device for the video camera according to the seventh aspect, in the device according to the first aspect and the device according to the sixth aspect, the optical path extending means. Because it was made expandable,
Even when a tilt operation of rotating the camera body up and down is performed, the height of the eyepiece portion can be kept from changing so much.

According to the image display device of the video camera according to the third and fourth aspects and the optical path extending device of the video camera according to the eighth and ninth aspects, the device according to the second aspect and the device according to the seventh aspect have the following advantages. Since the light beam emitted from the image display means is converted into a parallel light beam, a change in image magnification, image blur, and the like can be prevented even if the optical path extending means is expanded or contracted.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment of the present invention;
It is a figure which shows the external appearance structure of 1st Embodiment especially.

FIG. 2 is a diagram illustrating a configuration of a first embodiment, and in particular, is an optical path diagram illustrating a configuration of an optical path extending optical system according to the first embodiment.

FIG. 3 is a diagram illustrating a configuration of the first embodiment, and in particular, is an optical path diagram illustrating a configuration of an erecting prism for extending an optical path according to the first embodiment.

FIG. 4 is a diagram showing a configuration of the first embodiment, and in particular, is a diagram showing a configuration of a lens barrel for extending an optical path according to the first embodiment.

FIG. 5 is a diagram for explaining the operation of the first embodiment, and particularly, a diagram showing a state where a lens barrel for extending an optical path according to the first embodiment is extended.

FIG. 6 is a diagram showing optical data of an optical system for extending an optical path according to the first embodiment.

FIG. 7 is a diagram illustrating aberrations of the optical system for extending an optical path according to the first embodiment, and particularly illustrating aberrations when a distance between relay lenses is set to 40 mm.

FIG. 8 is a diagram illustrating aberrations of the optical system for extending an optical path according to the first embodiment, and particularly illustrating aberrations when the distance between relay lenses is set to 100 mm.

FIG. 9 is a diagram illustrating aberrations of the optical system for extending an optical path according to the first embodiment, and particularly illustrating aberrations when the distance between relay lenses is set to 160 mm.

FIG. 10 is a diagram showing a configuration of the first embodiment.
FIG. 3 is a diagram illustrating a configuration of an eyepiece.

FIG. 11 is a diagram showing optical data of the eyepiece of the first embodiment.

FIG. 12 is a diagram illustrating a configuration of a second embodiment of the present invention, and in particular, is an optical path diagram illustrating a configuration of an optical system for extending an optical path according to the second embodiment.

FIG. 13 is a diagram illustrating optical data of an optical path extending optical system according to a second embodiment.

FIG. 14 is a diagram illustrating aberrations of the optical system for extending an optical path according to the second embodiment, and particularly illustrating aberrations when a distance between relay lenses is set to 40 mm.

FIG. 15 is a diagram showing aberrations of the optical system for extending an optical path according to the second embodiment.
FIG. 7 is a diagram showing aberrations when the setting is made to.

FIG. 16 is a diagram illustrating aberrations of the optical system for extending an optical path according to the second embodiment, and particularly, a distance between relay lenses is set to 160 mm.
FIG. 7 is a diagram showing aberrations when the setting is made to.

FIG. 17 is a diagram showing an external configuration of a conventional finder of an ENG camera.

[Explanation of symbols]

Reference numeral 100: camera body, 200: shoulder rest portion, 300: imaging optical portion, 400: handle portion, 500: viewfinder, 6
00: tripod, 510: image display section, 520: optical path extending section, 530: eyepiece section, 511: CRT, 512 ...
Reflecting mirror, 513: CRT storage section, 521: Optical system, 52
2 ... Barrel, 531: Eyepiece, 532 ... Barrel, 53
DESCRIPTION OF SYMBOLS 3 ... Protection part, 534 ... Mounting part, 1A ... First relay lens, 2A ... Second relay lens, 3A ... Erect prism, 4A ... Field lens, 1C ... First lens barrel, 2C
... Second lens barrel, 3C. Third lens barrel, 4C.
C, 6C: projection, 7C: eyepiece storage part, 1a, 3
a, 1b, 1c, 3c, 2d ... convex lens, 2a, 2b,
2c, 1d ... concave lens

Claims (10)

[Claims] 1. An image display means provided on a main body of a video camera, for displaying an image taken by the video camera, and detachably attached to the image display means, and a light beam emitted from the image display means. An image display device for a video camera, comprising: an optical path extending means for extending an optical path. 2. An image display device for a video camera according to claim 1, wherein said optical path extending means is configured to be able to expand and contract in the optical path direction of said light beam. 3. The optical path extending means is provided with a first optical system for emitting a light beam emitted from the image display means as a parallel light beam, and movably arranged in an optical axis direction. 3. The image display device for a video camera according to claim 2, further comprising a second optical system that forms an image of a light beam emitted from the first optical system. 4. The first optical system is arranged such that an image plane of the image display means is located at a focal point and emits a light beam emitted from the image display means as a parallel light beam. A second lens that relays a light beam emitted from the first lens; and a second lens that relays a light beam emitted from the second lens. An erecting prism for inverting the left and right sides, and a third for imaging a light beam emitted from the erecting prism
The image display device for a video camera according to claim 4, wherein the image display device is configured to have the following lenses. 5. The image display means is configured such that an eyepiece is located at a central part of a main body of the video camera, and the optical path extending means sets an optical path of a light beam emitted from the image display means to an optical path. 2. The image display device for a video camera according to claim 1, wherein the image display device is configured to extend to a rear portion of a main body of the video camera. 6. A light beam emitted from the image display means, which is detachably attached to an image display device provided on a main body of the video camera and having an image display means for displaying a captured image of the video camera. An optical path extending device for a video camera, comprising an optical path extending means for extending an optical path of the video camera. 7. The optical path extending device for a video camera according to claim 6, wherein said optical path extending means is configured to be able to expand and contract in the optical path direction of said light beam. 8. The optical path extending means is provided with a first optical system for emitting a light beam emitted from the image display means as a parallel light beam, and movably arranged in an optical axis direction. 8. The optical path extending device for a video camera according to claim 7, further comprising a second optical system that forms an image of a light beam emitted from the first optical system. 9. The first optical system is arranged so that an image plane of the image display means is located at a focal point, and emits a light beam emitted from the image display means as a parallel light beam. A second lens that relays a light beam emitted from the first lens; and a second lens that relays a light beam emitted from the second lens. An erecting prism for inverting the left and right sides, and a third for imaging a light beam emitted from the erecting prism
9. The optical path extending device for a video camera according to claim 8, wherein the optical path extending device comprises: 10. The image display means is configured such that an eyepiece is located at a central part of a main body of the video camera, and the optical path extending means sets an optical path of a light beam emitted from the image display means to the image display means. 7. The optical path extending device for a video camera according to claim 6, wherein the optical path extending device is configured to extend to a rear portion of the main body of the video camera.