JP2001285202A - Waveguide for optical multi-dimensional input unit having uniform received light intensity - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waveguide used for receiving light of a multi-input device through optical space transmission that can obtain a difference from a wide visual field and a small received light intensity. SOLUTION: The waveguides to enhance the light receiving sensitivity are combined like a honeycomb or compound eyes of insects to obtain a required visual field angle and also to change a light collection gain through the adjustment of an aperture area of each waveguide thereby decreasing received light intensity differences caused by remote and near distances depending on a direction of a light emission source.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spatial light transmission type multi-input device, and makes use of the advantage of space transmission to stably transmit signals from various directions and distances transmitted from a moving light emitting source. Used in applications and fields where you want to receive.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a photodetector 6a is provided on a ceiling 7 or a wall 8 in a use space so as to compensate for insufficient light receiving sensitivity and viewing angle and reduce the difference in received light intensity so that stable reception is possible. , 6b, 6c. In addition, when there is one light receiver, the position of the light emitting source is limited in terms of distance and angle.

[0003]

Although an economical system with a reduced number of required light receivers is desired, a single light receiver limits the range of movement. SUMMARY OF THE INVENTION It is an object of the present invention to provide a waveguide for an optical multi-input device that increases the sensitivity of a light receiver, widens a viewing angle, and increases a dynamic range with respect to light intensity.

[0004]

SUMMARY OF THE INVENTION A waveguide for an optical multi-input device according to the present invention comprises a plurality of light-collecting horns or light-collecting lenses arranged in various directions in a space to be used, such as a honeycomb or an insect compound eye. By adjusting the condensing gain of each condensing horn or condensing lens, a uniform light intensity can be obtained in all directions to secure stable communication.

[0005]

Embodiment 1 FIG. 1 is a schematic view of a main part of Embodiment 1 of the present invention. In the figure, reference numerals 2a, 2b, 2c, and 2d denote light-collecting horns, and an auction is performed by a large number of participants in the stair-shaped seat 5, and each participant is provided with a portable optical signal transmitting terminal 4a,
Light is emitted from 4b, 4c, and 4d, and a bid is sent to the light receiver 11 including the optical sensor 1 and 2a to 2d in front of the venue.

In a typical auction site, the distance from the portable optical signal transmitting terminal 4a at the top to the light receiver 11 is about 20 m, and the distance from the portable optical signal transmitting terminal 4d at the bottom to the light receiver is about 20 m. It is about 4 m. In such a case, the light intensity acts on the square of the distance, and the performance required for the sensor or amplifier after receiving light becomes severe.

However, since the light receiving directions are different between the upper stage and the lower stage, the light 3a from the farthest terminal 4a is guided to the condensing horn 2a having the largest condensing gain, and then the portable light having the longest distance. The light 3b from the signal transmitting terminal 4b goes to the condensing horn 2b with the next highest condensing gain, the light 3c from the portable optical signal transmitting terminal 4c goes to the condensing horn 2c, and the light 3b from the portable optical signal transmitting terminal 4d. The light 3d is guided by the focusing horn 2d.

At the exit of each focusing horn, the gain of each focusing horn is adjusted so that the light intensity becomes uniform.

Depending on the venue, the distance may differ between the front and the left and right ends. In this case, the light collection gain may be adjusted between the left and right horizontal light collection horns to achieve uniformity.

[0010]

Embodiment 2 FIG. 2 shows an example in which a condenser lens is used as the condenser means. Reference numerals 2aa to 2dd denote spherical condenser lenses, and the condenser gain can be adjusted by changing the diameter of each lens.

The positions of the sensors 1a to 1d are adjusted in accordance with the directions of the portable optical signal transmitting terminals 4a to 4d.

[0012]

According to the present invention, as described above, the sensitivity of the photodetector 11 can be increased, the viewing angle can be increased, and the dynamic range with respect to the light intensity can be increased.

[Brief description of the drawings]

FIG. 1 is a schematic view of a main part of a first embodiment of the present invention.

FIG. 2 is a schematic diagram of a main part of a second embodiment of the present invention.

FIG. 3 is a schematic diagram of a conventional multiple input device.

[Explanation of symbols]

 1, 1a, 1b, 1c, 1d Optical sensor 2a, 2b, 2c, 2d Focusing horn 2aa, 2bb, 2cc, 2dd Spherical focusing lens 3a, 3b, 3c, 3d Optical transmission signal 4a, 4b, 4c, 4d Portable Type optical signal transmitting terminal 5 staircase seat at auction site 6a, 6b Conventional light receiver mounted on ceiling 6c Conventional light receiver mounted on wall 7 Ceiling 8 Wall

Claims (2)

[Claims] A plurality of light-collecting horns are radially grouped by a required viewing angle, and the light-collecting gain of each light-collecting horn is changed. A waveguide for an optical multi-input device that has been corrected to make the received light intensity from all directions within the viewing angle uniform. 2. Condensing lenses are radially grouped by the required viewing angle, and the condensing gain of each condensing lens is changed to correct a difference in received light intensity depending on the direction of the light source due to distance. A waveguide for an optical multi-input device in which received light intensity from all directions within a viewing angle is made uniform.