JPH01316076A - Display image pickup device - Google Patents

Abstract

PURPOSE:To make the direction in which a displaying screen is watched and the image pickup direction of an image pickup optical system coincident with each other by providing plural partial lenses or partial reflecting mirrors forming part of an image forming lens or image forming mirror of the image pickup optical system around the displaying screen. CONSTITUTION:The image of a partner is displayed on a flat panel display 11 and the image of the person M watching the display 11 is formed in a CCD area sensor 25 through a lens formed of partial lenses 21-24 and converted into electric signals. The unevenness, in density of the image of the person M can be solved by providing and compensating a light quantity compensating density 26 which compensates the distribution of light quantities in front of the sensor 25 or compensating the unevenness by using a light quantity compensation circuit 27 after the image is converted into the electric signals. The same effect can be obtained even when partial reflecting mirrors are used instead of the partial lenses 21-24.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a display and imaging device used in a TV telephone or the like.

(Prior Art) Conventionally, in a video telephone, etc., as shown in FIG.
Normally, an imaging optical system 40 consisting of a lens 41 and an image sensor 42 is placed above (or to the side of) the display screen 31 of the person M, and the direction in which the human M views the display screen 31 and the direction of the imaging optical system 40 are adjusted. Since the shooting directions were different, there was a drawback that the line of sight could not match. FIG. 6 shows an example of a method used in cameras such as TV studios to solve this problem. In this figure, the display screen 3 is shown using a semi-transparent mirror 32.
1 image is displayed and photographed from behind the semi-transparent mirror 32 using a lens 41 and an image sensor 42 in an attempt to reduce line-of-sight mismatch.

[Problem to be solved by the invention]

However, in this method, the display system 30 is equivalent to the semi-transparent mirror 3.
2, the display position is set back from the entire surface of the device, the viewing angle is limited, and the amount of light for display and imaging is halved.

The purpose of this invention is to prevent the above-mentioned display screen from being recessed.
It is an object of the present invention to provide a display and image pickup device for a TV telephone, etc., which has almost the same line of sight and is free from such drawbacks.

[Means to solve the problem]

The display and imaging device according to the present invention includes a plurality of partial lenses or partial reflection mirrors that constitute a part of the imaging lens or imaging reflection mirror of the imaging optical system arranged around the display screen,
It consists of one imaging lens or imaging reflecting mirror.

[Function] In this invention, each of the plurality of partial lenses or partial reflecting mirrors acts as one imaging lens or imaging reflecting mirror, and the viewing direction of the display screen and the imaging direction of the imaging optical system are different from each other. Match.

(Embodiment) FIGS. 1(a) and 1(b) show an embodiment of the present invention. FIG. 1(a) is a front view thereof, and FIG. 1(b) is a first embodiment of the present invention.
It is a side view of figure (a). In this figure, 10 is the display system,
It is equipped with 11 flat panel displays. 20
2 is an imaging optical system, 21 to 24 are partial lenses that together constitute one lens, 25 is a CCD area sensor, 26 is a light amount correction density plate, and 27 is a light amount correction circuit. The image of the other party is displayed on the flat panel display 11, and the image of the person M looking at it is formed on the CCD area sensor 25 by a lens composed of partial lenses 21 to 24.
converted into an electrical signal. The problem with this method is whether or not a sufficient image can be obtained with such partial lenses 21 to 24. Regarding this, an experiment was conducted using the following method.

Since it is difficult to obtain a large lens L, the 20 mm x 30 m lens used in telephone band videophones, etc.
Assuming that the partial lenses 21 to 24 are placed around a flat panel display 11 of approximately 3 mm x 5 m.
Assuming that four openings 21' to 24' of 20mm x 30mm are placed outside a 20mm x 30mm area as shown in Fig. 2, 3
The apertures 21' to 24' were attached to the entire surface of a 105 mm lens attached to a 5 mm camera, and photographs were taken. The image in the blurred areas shows a characteristic blur, but the images in the in-focus areas were sufficient. Calculating the amount of light from the aperture area of the lens, it will be about 1/23, whereas the TTL exposure system of the camera will be about 1/40, and the shooting result will be 1/20 to 1/4.
The result was 0, which was almost the same. In addition, density unevenness was observed in some parts of the photographic results. This problem becomes particularly serious when the number of partial lenses is small, and a solution is required. A method for solving this problem is to place a light intensity correction density plate 26 for correcting the light intensity distribution in front of the CCD area sensor 25, or to correct the light intensity distribution using a light intensity correction circuit 27 after it is converted into an electric signal. A combination of the two methods can be applied.

3(a) to 3(C) show other embodiments of the partial lens system. FIG. 3(a) is a sectional view of the main part, and the whole lens is shown by a dotted line. FIG. 3(b) is an enlarged view of the partial lens 21, which, as shown in FIG. 3(c), is composed of a normal lens 21a and a prism 21b. This allows the lens system to be manufactured at low cost.

FIGS. 4(a) and 4(b) are a front view and a side view of main parts showing another embodiment of the present invention, in which partial reflecting mirrors 21A to 24A are used instead of partial lenses 21 to 24. , no space is required behind the flat panel display 11. Furthermore, if the partial reflecting mirrors 21A to 24A constitute one spherical reflecting mirror as a whole, there is an advantage that a normal spherical reflecting mirror can be used as the partial reflecting mirror.

Although each of the above embodiments has been described using four partial lenses 21 to 24 and four partial reflecting mirrors 21A to 24A, the present invention is not limited to this. It is possible to make the light amount distribution etc. more uniform. Further, depending on the case, it is possible to further reduce the number of partial lenses and partial reflecting mirrors.

Further, in the above description, a single lens and a single projection mirror are used, but a lens system may be inserted between the CCD area sensor 25 and the CCD area sensor 25. This makes it possible to correct the magnification ratio and the like.

(Effects of the Invention) As described above, the present invention includes disposing a plurality of partial lenses or partial reflecting mirrors constituting a part of the imaging lens or imaging reflecting mirror of the imaging optical system around the display screen, 1
Since the imaging lenses or imaging reflectors are configured,
This has the advantage that a reading system with nearly coincident lines of sight can be constructed using a simple optical system.

[Brief explanation of the drawing]

Figure 1 is a front view and side view showing an embodiment of the present invention, Figure 2 is a front view of the lens used in the experiment, and Figure 3 (a).
~(C) is an overall side view showing another example of the partial lens system,
FIGS. 4(a) and 4(b) are a front view and a side view of essential parts showing another embodiment of the present invention, and FIGS. 5 and 6 are an enlarged external view and an exploded view of one partial lens. FIG. 3 is a side view showing an example of a conventional display and imaging device. In the figure, 10 is a display system, 11 is a flat panel display, 20 is an imaging optical system, 21 to 24 are partial lenses, and 21A
~24A is a partial reflecting mirror, 25 is a CCD area sensor, 2
6 is a light amount correction density plate, and 27 is a light amount correction circuit. Σ (N (4 to γ6

Claims (1)

[Claims] In a display and imaging device comprising a display system including a display screen and an imaging optical system including an imaging lens or an imaging reflector, the imaging lens or the imaging optical system of the imaging optical system is arranged around the display screen. 1. A display and imaging device characterized in that a plurality of partial lenses or partial reflection mirrors constituting a part of an image reflection mirror are arranged to constitute one imaging lens or image formation reflection mirror.