JP2564394Y2 - High-speed optical computing 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 high-speed optical operation device using light such as a control device.

[0002]

2. Description of the Related Art An example of the prior art will be described with reference to FIG. 4. Binary input images A1 and B2 are each composed of m.times.n pixels, and have binary levels of 0 and 1 as shown in FIG. the code corresponding to, transmit light, represented by light and dark impermeable,
The coded input image 3 superimposed and represented in FIG.
And This image is placed on the input surface 4 of the projection optical system as shown in FIG.
Illuminated by 6, adjust the arrangement of the system, 4 LEDs
The projected images of the coded input image 3 by 6 are projected on the screen 7 so as to be shifted by half a pixel vertically and horizontally, and the projected images are observed through a copy mask 8 having square windows arranged in a square lattice. Then, the operation result of the two-variable binary logic function is obtained as a light / dark signal of light in parallel with respect to all pixels constituting the image. By changing the combination of the blinking states of the four LEDs 6 as shown in FIG. 6, 16 types of logical operations can be performed. With this means, a parallel logical operation based on the parallelism of light can be executed. The details of this are described in "Optical Computer" published by Ohmsha, pp. 102-111.

[0003]

However, such means have the following problems. (1) In order to perform a negative expression for a numerical operation, encoding at a logical level is necessary, for example, a complement expression is required. (2) An error occurs only when a part of the image is missing.

[0004] The present invention has been proposed in view of such circumstances, and an object thereof is to provide a high-speed optical computing devices with less structure simple and error.

[0005]

SUMMARY OF THE INVENTION To this end, the present invention provides a light source, a plurality of phase control means for controlling the phase of a light wave spread from the light source, and a spatial light source provided by the phase control means. A sign is given to the image of the grating having the amplitude distribution of the cosine or sine wave light by the spatial frequency.
Means, means for the means for combining light waves exiting from said phase control means, means for the spatial inverse Fourier transform for the synthesized light waves, the spatial Fourier transform on light wave of the same spatial inverse Fourier transform, the spatial Fourier Converted light
Through the wave, through the pinhole and collimating lens
It is characterized in that example Bei and means for synthesizing the diverted light waves.

[0006]

[Action] numerically expressed in binary or ternary representation for each digit shed dividing one frequency on the spatial frequency. For example, each digit is represented in such a manner that if one digit is 1, the assigned frequency exists, and if 0, it does not exist. Further, in the ternary representation, if there is a digit of -1, the allocated frequency exists and the phase of the light wave is adjusted so as to be 180 ° different from the case where it is 1. Numerical row representation Umono by the light wave, a means to express the light waves of the amplitude and phase. Thus, since to convert a number expressed by the optical wave amplitude and phase with means for optically inverse spatial Fourier transform, each digit is a sine wave or cosine wave amplitude grating light-dark pattern. In this state,
When the two numerical values thus represented are superimposed in the manner described above, the amplitude grid representing each digit is added or subtracted by being strengthened or weakened, and the result is inversely converted into a space. When the frequency is returned to the spatial frequency by means of Fourier transform, it returns to the original numerical expression reflecting the result of addition and subtraction.

[0007]

FIG. 1 is a plan view showing the first embodiment of the present invention, and FIG. 2 is a diagram showing a relationship between a numerical representation by a phase distribution modulator and a spatial inverse Fourier transform in FIG. FIG. 3 is an overall plan view showing a second embodiment of the present invention. First, in FIG. 1, a light wave 9 emitted from a light source 10 which preferably emits coherent light
Proceeds more divided two directions to the half mirror 11. One of the light wave passes through the ND filter 12 is straight, the diameter of the beam <br/> through lightwave expander over 13 is expanded through the spatial modulator 14. The spatial modulator 14 is composed of a phase delay material 30, an amplitude control material 31, and a pinhole 32, as shown in the principle diagram of FIG. , 0, −1. This modulation provides a numerical value expressed by binary or ternary, this row of dividing each digit of the given number. The phase delay material 30 can be realized by an electro-optic material or the like, and the amplitude control material 31 can be realized by a filter or the like. In FIG. 1, the other light wave reflected in the right angle direction is modulated by obtaining the same process. When this light wave is superimposed on the straight light wave by the half mirror 15 and subjected to spatial inverse Fourier transform by the Fourier transform lens 16, each digit of the numerical value becomes an amplitude grating shown on the right side of the lower half of FIG. here,
Assuming that the focal lengths of the Fourier transform lens 16 and the Fourier transform lens 17 are f ₁₆ and f ₁₇ , respectively, the optical distance between the phase modulator 14 and the Fourier transform lens 16 is equal to f _16, and the phase modulator 14 and the Fourier transform lens 16 optical distance through the half mirror 15 and also next to _{f 16,} 2
The distance between the Fourier transform lenses 16 and 17 is f ₁₆ +
equally it is installed in the f _17. The distance of the stop 41 and the Fourier transform lens 17 and _{f 17.} They are,
When the original digits are 1 and -1, respectively, the phases of the gratings are different by 180 ° and thus cancel each other, and the spatial frequency components disappear. The original digits are 0, 1, 0, -1, 1 + 1, ( -
In the case of the combination of 1 ) + ( -1 ) , each spatial frequency component is stored as it is, and therefore, addition and subtraction are represented by superposition of lattices having a certain spatial frequency. Furthermore, the result space is a Fourier transform by the Fourier transform lens 17, and appearing directly proceeds component in the center of a light wave, when the other of the spatial frequency component superimposed on the light receiving element array 25, represented by a binary or ternary Is obtained, which is the result of addition or subtraction. According to the phase distribution control means of the embodiment, 6-bit information can be obtained. That can be expressed and a pinhole pair of phase delay material and amplitude control material in a position symmetric to sandwich the optical axis, the 1 bit by the phase delay material and amplitude control material and the pinhole center of the optical axis.

Next, a second embodiment of the present invention will be described with reference to FIG. 3. The configuration and operation up to passing through the Fourier transform lens 17 are the same as those of the first embodiment. However, the light that has passed through the Fourier transform lens 17 is split in two directions by a half mirror 40, and one of the lights goes straight through the half mirror 24 and passes from the Fourier transform lens 17 to its focal length f.
_The light is projected onto the light receiving element array 25 located at a distance by ₁₇ . The other light is projected on the pinball 42 via the mirror 19 and the mirror 21. Pinhole 42 is
The optical distance from the Fourier transform lens 17 is the focal length f
It is placed in the position of _17, only the straight advancing component of light having a spatial frequency than the window opened in its optical axis center is transmitted. The light that has passed through the pinball 42 is spread by the collimating lens 43, reflected by the half mirror 24, and converted into light having a uniform phase distribution.
Is projected to The above straight optical wave and the reflected light waves are superimposed on the light element array 25, is converted interfere with the light wave having an amplitude of the binary or ternary.

[0009]

According to the present invention, the expressions of 0, 1, and -1 can be realized optically, so that the operation at the level of the logical expression is unnecessary. Also, since the numerical values are represented as a group of amplitude grids, the original numerical values can be reproduced even if a part of the grids is missing.

In short, according to the present invention, a light source, a plurality of phase control means for controlling the phase of a light wave spread from the light source in a plane, and a spatial cosine or sine wave shape given by the phase control means , respectively. Means for assigning a sign to the image of the grating having the amplitude distribution of light by a spatial frequency, means for synthesizing the light wave emitted from the phase control means , and
A means for performing a spatial inverse Fourier transform on a light wave and the same space
Means for performing a spatial Fourier transform on the light wave that has undergone the inverse Fourier transform, and a light wave that has undergone the spatial Fourier transform,
Light diverted through pinholes and collimating lenses
By painting Bei and means for synthesizing a wave, since obtaining a high speed optical computing devices with less structure simple error, the present invention is intended on extremely valuable industrial.

[Brief description of the drawings]

FIG. 1 is an overall plan view showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between a numerical representation by a phase distribution modulator in FIG. 1 and a spatial inverse Fourier transform.

FIG. 3 is an overall plan view showing a second embodiment of the present invention.

FIG. 4 is a principle diagram showing a conventional optical operation device.

FIG. 5 is a diagram showing an input logical expression in FIG. 4;

FIG. 6 is a diagram showing an output logic expression in FIG. 4;

[Explanation of symbols]

 Reference Signs List 10 light source 11 half mirror 12 ND filter 13 beam expander 14 spatial modulator 15 half mirror 16 Fourier transform lens 17 Fourier transform lens 18 relay lens 19 mirror 20 beam expander 21 mirror 22 mirror 23 relay lens 24 half mirror 25 light receiving element array 41 stop 42 Pinhole 43 Collimating lens

Claims (1)

(57) [Scope of request for utility model registration] 1. A light source and a light wave spread from the light source.
A plurality of phase control means for controlling the phase of the
The spatial cosine or sine respectively given by the steps
The spatial frequency is applied to the image of the grating with the amplitude distribution of the wavy light.
Means for assigning a sign, and light emitted from the phase control means.
Means for synthesizing the wave and spatial inverse
Means for performing a Fourier transform and light subjected to the same space inverse Fourier transform
Means for performing a spatial Fourier transform on the waves and
A pinhole and collimation
Means for synthesizing the light wave diverted through the heat lens.
A high-speed optical operation device characterized by the following.