JPH0537830A - Television camera coaxial type display device - Google Patents

Abstract

PURPOSE:To prevent attenuation of the brightness of video image on a display section and to prevent a reflecting light from being displayed on a displayed video image of a television camera in the television camera coaxial display device in which the visual axis of a display section and the optical axis of the television camera are made coaxial with respect to the line of sight. CONSTITUTION:A video 26 displayed on a liquid crystal display section 5 radiates as a p-polarized light, transmits through a beam splitter 2 almost without being attenuated and is displayed for a talker 1. The image of the talker 1 is made incident in the beam splitter 2 as a non-polarized light 20, reflected as an s-polarized light 21, rotated by a 1/4 wavelength plate 3, made incident in the television camera 4 and picked up as a circularly polarized light 22. A reflected light 23 resulting from the circularly polarized light 22 by the television camera 4 is again rotated by the 1/4 wavelength plate 3 and results in a p-polarized light 24, then the reflecting light passes through the beam splitter 2 almost without being reflected in the direction of the talker 1 and is absorbed by an optical absorbing film 6 thereby preventing the reflected light from being displayed on the video image of the television camera 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television camera coaxial type display device in which the optical axis of the television camera is aligned with the line of sight of a speaker who is talking while watching an image or a manuscript in a video telephone, a prompter or the like.

[0002]

2. Description of the Related Art In a telephone call or conversation using a videophone, a prompter or the like, a speaker makes a telephone call or the like by directing his or her line of sight to a video image or an original image displayed on the display unit of the speaker. here,
When the TV camera is away from the display unit and the line of sight of the speaker toward the image on the display unit does not match the optical axis of the TV camera, the image of the speaker transmitted to the other terminal is A person will face the other side to make a call or the like, which will give the other person a feeling of discomfort or discomfort (hereinafter referred to as discomfort).

In order to eliminate such a feeling of discomfort, a display device in which the optical axis of the television camera section and the visual axis of the display section are coaxial with the line of sight of the speaker by using a half mirror (hereinafter, referred to as television camera coaxial type display) There is a videophone equipped with a device).

FIG. 2 is a block diagram of a conventional television camera coaxial type display device mounted on a video telephone.

In the figure, a speaker 1 talks through a protective glass 8 and a half mirror 9 by directing his / her line of sight to a partner image displayed on a display unit 10 on a visual axis 11. At the same time, the TV camera unit 4 takes an image of the speaker 1 illuminated by natural light or illumination light 20 through the half mirror 9 and the protective glass 8 coaxially with the line of sight, and as a video signal to the other terminal through the line. To transmit. Here, the half mirror 9 is arranged so that the visual axis 11 of the display unit 10 and the optical axis 12 of the TV camera unit 4 which are orthogonal to each other are coaxial with the line of sight of the speaker 1, so that the half mirror 9 intersects the two axes as shown in the figure. Is an optical path changer disposed in.

[0006]

In the conventional apparatus shown in FIG. 2, the speaker 1 has a display unit 10 via a half mirror 9.
However, there is a drawback in that only the dark image can be seen because the image 36 is viewed.

Further, the television camera unit 4 has a half mirror 9
The speaker 1 is imaged as the reflected light 31 from the TV camera unit 4 illuminated by the reflected light 31.
It is incident on the half mirror 9 as 2 and is reflected. In other words, the reflected image 33 of the TV camera unit 4 is mixed in the image on the display unit 10 which the speaker 1 gazes at, which is not only unpleasant, but also causes the talker 1 to be aware of the TV camera. It was

Therefore, according to the present invention, a polarization beam splitter that transmits or reflects linearly polarized light with almost no attenuation is used as the optical path changing means, so that the utilization factor of the light emitted from the display section is significantly improved and a bright image is obtained. At the same time, the present invention proposes a television camera coaxial type display device capable of eliminating the reflection image of the reflection image of the television camera portion on the display image.

[0009]

In order to solve the above-mentioned problems, according to the present invention, the visual axis of the display means and the optical axis of the television camera are made visible by the optical path changing means arranged at the intersection of both axes. In the matched television camera coaxial display device, a polarization beam splitter as an optical path changing means, a quarter-wave plate arranged between the polarization beam splitter and the television camera, a polarization beam splitter and the display means are provided. It has a polarizing plate arranged between them.

[0010]

In FIG. 1 showing an embodiment in which the present invention is applied to a video telephone, an unpolarized light 20 reflected from a speaker 1 is shown.
Are s-polarized light 21 and p in the polarization beam splitter 2.
Separated into polarized light 25. The s-polarized light 21 is converted into circularly polarized light 22 through the quarter-wave plate 3 and is incident on the TV camera unit 4, and the TV camera unit 4 captures an image of the speaker 1 with the visual axis 11 and the optical axis 12 coaxial with the line of sight. Is performed.

Circularly polarized light 22 reflected by the TV camera unit 4
Enters the quarter-wave plate 3 as reflected light 23 and exits as p-polarized light 24. The p-polarized light 24 is transmitted through the polarization beam splitter 2 with almost no attenuation and is absorbed by the light absorption film 6, so that the reflected image 23 of the television camera unit 4 is not mixed in the line of sight of the speaker 1. ..

On the other hand, the other party image displayed on the liquid crystal display unit 5 arranged on the line of sight of the speaker 1 enters the polarization beam splitter 2 as p-polarized light 26 and is hardly attenuated by the speaker 1. Reach Therefore, there is no decrease in brightness due to the interposition of the polarization beam splitter 2, a bright image 26 is displayed on the speaker 1, and the reflected image of the television camera unit 4 is the image 26.
It does not overlap with.

[0013]

Embodiments of the television camera coaxial type display device according to the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, in which the same parts as those of the conventional example (FIG. 2) are designated by the same reference numerals, and the duplicate description thereof will be omitted.

Numeral 2 is a polarization beam splitter which almost completely transmits the p-component and almost completely reflects the s-component of the incident non-polarized light (natural light or illumination light 20).
Reference numeral 3 denotes a quarter-wave plate provided on the front surface of the television camera unit 4, and the s-polarized light 21 incident from the beam splitter 2
Is rotated by being transmitted through the quarter-wave plate 3 to become circularly polarized light 22 and enters the television camera unit 4. At this time,
The circularly polarized light 22 is reflected by the TV camera unit 4 and travels backward as reflected light 23, but is rotated by the quarter-wave plate 3 to generate p.
Since it becomes polarized light 24, it is transmitted through the polarization beam splitter 2 with almost no attenuation and reaches the light absorption film 6 to be absorbed.

Therefore, according to this configuration, the non-polarized light 20,
That is, the reflected light from the speaker 1 illuminated by natural light or illumination light enters the television camera unit 4 as circularly polarized light 22 through the polarization beam splitter 2 and the quarter-wave plate 3 and is captured as a self-portrait. It is transmitted to the terminal as an image of speaker 1. In addition, the circularly polarized light 2 incident on the TV camera unit 4
The reflected light 23 from the TV camera unit 4 of No. 2 is rotated by the quarter-wave plate 3 to become p-polarized light 24, which is almost reflected in the direction of the speaker 1 and transmitted through the polarization beam splitter 2 to absorb light. Since it is absorbed by the film 6, the speaker 1 is not affected by the reflection image 23 of the TV camera unit 4.

Reference numeral 5 denotes a liquid crystal display section arranged on the line of sight, including a liquid crystal panel 51 including a backlight, and a polarizing plate 52 arranged on the front surface of the liquid crystal panel 51 so as to transmit p-polarized light. It is composed integrally from. The partner image transmitted through the line and displayed on the liquid crystal display unit 5 is p-polarized light 2
It is emitted from the polarizing plate 52 as 6 and is transmitted through the polarization beam splitter 2 with almost no attenuation and reaches the speaker 1.
Here, the liquid crystal display unit 5, the quarter-wave plate 3 and the television camera unit 4 may be replaced with each other, and the liquid crystal display unit 5 has a polarizing plate 52 on the front surface. It may be a display means such as a CRT provided on the body.

Therefore, the other party image 26 displayed on the liquid crystal display section 5 is displayed to the speaker 1 without impairing the brightness, and the speaker 1 is affected by the reflection of the TV camera section 4. Nor.

It is to be noted that a document or the like can be arbitrarily placed on the light absorbing film 6, the speaker 1 and the document or the document having the p-polarized light 24 as illumination light are superposed and imaged, and transmitted to the other terminal. You may do so. In this case, by placing a blank sheet or the like at the position of the speaker 1, only the document original may be transmitted, or the document original may be illuminated by, for example, infrared rays.

Further, although the present invention is applied to a videophone as described above, for example, when it is applied to a so-called prompter which is used when reading a manuscript or the like with the line of sight directed toward the TV camera, a liquid crystal display is used. A document or the like may be placed at the position of the section 5.

Further, when the light reflected on each surface of the deflecting beam splitter 2 or the front surface of the liquid crystal display unit 5 is anxious, non-reflective coating is applied to each of these reflecting surfaces, or the deflecting beam splitter 2's A neutral density (ND) filter may be provided on the front surface (close to the speaker 1).

[0022]

As described above, the deflecting beam splitter,
According to the present invention, which is composed of a quarter-wave plate, a liquid crystal display unit, etc., the image displayed on the liquid crystal display unit can be displayed to the speaker with almost no loss of brightness, and the image can be displayed in a TV camera. It has the effect of not injuring anyone.

Further, if the document original can be placed arbitrarily, there is an effect that the document original can be superposed on the speaker image and transmitted, or only the document original can be transmitted.

Further, when the present invention is applied to a prompter or the like, there is an effect that a manuscript can be read aloud with the same sharpness as when directly looking, with the line of sight of the television camera.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional device.

[Explanation of symbols]

 1 Speaker 2 Deflection Beam Splitter 3 1/4 Wave Plate 4 TV Camera Section 5 Liquid Crystal Display Section 6 Light Absorbing Film 7 Outer Casing 11 Visual Axis (Line of Sight) 12 Optical Axis 20 Illumination Light (Non-Polarized) 21 s-Polarized 22 Yen Polarized light 23 Reflected light (circularly polarized light) 24, 25, 26 p-polarized light 51 Liquid crystal panel (including backlight) 52 Polarizing plate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04N 5/74 F 7205-5C

Claims (1)

Claim: What is claimed is: 1. A television camera coaxial display device in which the visual axis of the display means and the optical axis of the television camera are aligned with the line of sight by an optical path changing means arranged at the intersection of both axes, A polarization beam splitter as the optical path changing means, a quarter-wave plate provided between the polarization beam splitter and the television camera, and a polarization beam splitter provided between the polarization beam splitter and the display means. A television camera coaxial type display device having a polarizing plate.