JP3259285B2 - TV camera coaxial display device - Google Patents

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 display device in which the optical axis of a television camera coincides with the line of sight of a speaker who talks while watching an image or a document in a videophone or a prompter.

[0002]

2. Description of the Related Art In a call or conversation using a videophone, a prompter, or the like, a speaker performs a call or the like by directing his / her eyes on a partner's image or document displayed on a display unit of the user. here,
If the TV camera is far 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 partner terminal will be The user faces the other side to make a call or the like, which gives the other party a sense of discomfort or discomfort (hereinafter, referred to as discomfort).

In order to eliminate such discomfort, a display device in which the optical axis of the television camera unit and the visual axis of the display unit are coaxial with the line of sight of the speaker using a half mirror (hereinafter referred to as a television camera coaxial display). Device).

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

In FIG. 1, a speaker 1 talks with his / her eyes directed to a partner image displayed on a display unit 10 on a visual axis 11 via a protective glass 8 and a half mirror 9. At the same time, the television camera unit 4 captures the speaker 1 illuminated by the natural light or the illumination light 20 coaxially with the line of sight through the half mirror 9 and the protective glass 8, and transmits the image as a video signal to the partner terminal via the line. Transmit. Here, the half mirror 9 intersects the axes of the two axes as shown in the figure in order to make the visual axis 11 of the display unit 10 and the optical axis 12 of the television camera unit 4 orthogonal to each other with respect to the visual axis of the speaker 1. The optical path converter is disposed in the optical path converter.

[0006]

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

The television camera unit 4 is provided with 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.
The light is incident on the half mirror 9 and reflected. In other words, the reflected image 33 of the television camera unit 4 is mixed with the image on the display unit 10 watched by the speaker 1, which is not only annoying but also makes the caller 1 aware of the television camera. Was.

Therefore, the present invention uses a polarizing beam splitter, which transmits or reflects linearly polarized light almost without attenuating, as an optical path changing means, thereby greatly improving the utilization rate of light emitted from a display unit and thereby improving the brightness of a bright image. At the same time, the present invention proposes a television camera coaxial display device which can eliminate the reflection 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 connected to the visual axis by the optical path changing means disposed at the intersection of both axes. In the matched television camera coaxial display device, a polarization beam splitter as an optical path changing unit, a quarter-wave plate provided between the polarization beam splitter and the television camera, and a polarization beam splitter and a display unit. And a polarizing plate disposed therebetween.

[0010]

FIG. 1 shows an embodiment in which the present invention is applied to a video telephone. In FIG.
S-polarized light 21 and p in polarization beam splitter 2
Separated into polarized light 25; The s-polarized light 21 is converted into circularly polarized light 22 via the quarter-wave plate 3 and enters the television camera unit 4. The television 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.

The circularly polarized light 22 reflected by the television camera unit 4
Enters the quarter-wave plate 3 as reflected light 23 and exits as p-polarized light 24. Since the p-polarized light 24 is transmitted through the polarizing beam splitter 2 with almost no attenuation and absorbed by the light absorbing film 6, the reflected image 23 of the television camera unit 4 does not enter the line of sight of the speaker 1. .

On the other hand, the other party's 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 almost not attenuated. Reach Accordingly, there is no decrease in luminance due to the interposition of the polarizing beam splitter 2, a bright image 26 is displayed to the speaker 1, and the reflection image of the TV camera unit 4 is displayed on the image 26.
Also does not overlap.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a television camera coaxial display device according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the drawing, portions common to those of the conventional example (FIG. 2) are denoted by the same reference numerals, and redundant description is omitted.

Reference numeral 2 denotes a polarization beam splitter that transmits the p-component almost completely and reflects the s-component almost completely in the incident non-polarized light (natural light or illumination light 20).
Reference numeral 3 denotes a 波長 wavelength plate disposed on the front surface of the television camera unit 4. The s-polarized light 21 enters from the beam splitter 2.
Is rotated by transmitting through the quarter-wave plate 3 to become circularly polarized light 22 and is incident on the television camera unit 4. At this time,
The circularly polarized light 22 is reflected by the television camera unit 4 and travels backward as reflected light 23, but is rotated by the 波長 wavelength plate 3 and p
Since the light becomes the polarized light 24, it passes through the polarizing beam splitter 2 with almost no attenuation, reaches the light absorbing film 6 and is 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 via the polarizing beam splitter 2 and the quarter-wave plate 3 and is captured as a self-portrait. The video is transmitted to the terminal as the video of speaker 1. The circularly polarized light 2 incident on the television camera unit 4
The reflected light 23 from the TV camera unit 4 is rotated by the quarter-wave plate 3 to become p-polarized light 24, transmitted through the polarizing beam splitter 2 and hardly reflected in the direction of the speaker 1, and absorbed. Since the speaker 1 is absorbed by the film 6, the speaker 1 is not affected by the reflection image 23 of the television camera unit 4.

Reference numeral 5 denotes a liquid crystal display section disposed on the line of sight. The liquid crystal panel 51 includes a backlight, and a polarizing plate 52 disposed on the front surface of the liquid crystal panel 51 so as to transmit p-polarized light. From one. The other party's image transmitted through the line and displayed on the liquid crystal display unit 5 is p-polarized light 2
The light exits from the polarizing plate 52 as 6, passes through the polarizing beam splitter 2 with almost no attenuation, and reaches the speaker 1.
Here, it is also possible to adopt a configuration in which the positions of the liquid crystal display unit 5, the quarter-wave plate 3 and the television camera unit 4 are 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's image 26 displayed on the liquid crystal display unit 5 is displayed to the speaker 1 without deteriorating the brightness, and the speaker 1 is affected by the reflection of the television camera unit 4. Nor.

A document or the like can be arbitrarily placed on the light absorbing film 6, and the speaker 1 and a document with the p-polarized light 24 as illumination light are superimposed and imaged, and transmitted to the terminal of the other party. You may make it. In this case, by placing a blank sheet or the like at the position of the speaker 1, only the document may be transmitted, or the document may be illuminated with, for example, infrared rays.

Although the present invention is applied to a videophone, the invention is applied to a so-called prompter or the like which is used when reading an original or the like while keeping the line of sight at a television camera. A document or the like may be placed at the position of the unit 5.

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

[0022]

As described above, the deflection beam splitter,
ADVANTAGE OF THE INVENTION According to this invention which consists of a 1/4 wavelength plate, a liquid crystal display part, etc., it can display to a speaker, without substantially deteriorating the brightness | luminance of the image displayed on a liquid crystal display part. The effect is that the patient is not affected.

Further, if the document can be arbitrarily placed, there is an effect that the document can be transmitted while being superimposed on the speaker image, or only the document can be transmitted.

Further, when the present invention is applied to a prompter or the like, there is an effect that an original can be read aloud with the same sharpness as in the case of direct viewing while keeping the line of sight at the television camera.

[Brief description of the 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]

 DESCRIPTION OF SYMBOLS 1 Speaker 2 Deflection beam splitter 3 1/4 wavelength plate 4 TV camera part 5 Liquid crystal display part 6 Light absorption film 7 Outer housing 11 Visual axis (line of sight) 12 Optical axis 20 Illumination light (non-polarized) 21 s-polarized light 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

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/225-5/238 H04N ^7/ 14-7/15 G02B 27/28

Claims (1)

(57) [Claims] 1. A television camera coaxial display device in which a visual axis of a display means and an optical axis of a television camera are made to coincide with a line of sight by optical path conversion means disposed at an intersection of both axes. A polarizing beam splitter; a quarter-wave plate provided between the polarizing beam splitter and the television camera; and a polarizing plate provided between the polarizing beam splitter and the display means. Television camera coaxial display device characterized by the above-mentioned.