Optical operation apparatus for effecting parallel signal processing by detecting light transmitted through a filter in the form of a matrix

• US 4,815,027 A
• Filed: 09/23/1987
• Issued: 03/21/1989
• Est. Priority Date: 04/13/1984
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Tokumitsu, Jun, Handa, Yuichi, Saito, Kenji, Tanaka, Nobuyoshi, Nojiri, Hidetoshi
• Primary Examiner(s): Harkcom, Gary V.
• Application Number:
  US07/102,789
• Time in Patent Office: 545 Days
• Field of Search: 364/807, 364/819, 364/821-822, 364/837, 364/841, 364/845, 364/713, 364/604, 364/606, 364/728, 364/754, 350/96.1, 350/96.11-96.17, 350/162.11, 350/162.12, 350/355, 350/356, 350/358, 350/320, 350/321
• US Class Current: 708/835
• CPC Class Codes: G06E 3/005 using electro-optical or opto-electronic means
• CPC Class Codes: H04N 1/6016 Conversion to subtractive colour signals

Abstract

In an optical operation apparatus, a light source emits a light intensity-modulated on the basis of a first electrical signal. A modulating device receives the light from the light source and intensity-modulates the light on the basis of the first signal, and a photoelectric converting device converts the light modulated by the modulating device into a second electrical signal. These functions are carried out by any of a number of different arrangements of filter elements, and electro-optical or acoustico-optical devices can be used for intensity modulation.

Claims

1. An optical operation apparatus for effecting the following operation:

##EQU3## (n and m are integers each at least equal to

     2), said apparatus comprising;

a plurality of light sources arranged in a predetermined direction and emitting light of respective intensities corresponding to said S₁, S₂, . . . , S_m, respectively;

an optical filter in which m×

n portions having transmission factors corresponding to absolute values of said a₁₁, . . . , a_nm are arranged in the form of a matrix, said portions having transmission factors corresponding to the absolute values of said a_1i, a_2i, . . . , a_ni and receiving the light from the one of said light sources emitting light of intensity corresponding to said Si (i=1, . . . , m), respectively;

a plurality of photoelectric converting units arranged in a direction perpendicular to said predetermined direction for receiving the light beams transmitted through said optical filter and converting said light, beams, into electrical signals corresponding to said S₁ '"'"', S₂ '"'"', . . . , S_n '"'"', at least one of said units having at least a first light receiving portion for detecting the light transmitted through at least one said portion corresponding to at least one of said a₁₁, . . . , a_nm which has a positive value, at least a second light-receiving portion for detecting the light transmitted through at least one said portion corresponding to at least one of said a₁₁, . . . , a_nm which has a negative value, and means for subtracting the signal detected by said second light-receiving portion from that detected by said first light-receiving portion.

2. An optical operation apparatus according to claim 1, wherein the light-receiving portions of said photoelectric converting units which correspond to said portions of said optical filter are arranged in the form of a matrix.

3. An optical operation apparatus according to claim 2, further comprising an optical system for forming the image of said optical filter on said photoelectric converting units.

4. An optical operation apparatus according to claim 1, wherein said S₁, S₂, . . . , S_m are color signals and said S₁ '"'"', S₂ '"'"', . . . , S_n '"'"' are compensated color signals.

5. An optical operation apparatus for effecting the following operation:

##EQU4## (n and m are integers each equal to or greater than

     2), said apparatus comprising;

m light sources emitting lights of intensities corresponding to said S₁, S₂ . . . , S_m, respectively;

an optical filter having m×

n portions having transmission factors corresponding to absolute values of said a₁₁, . . . , a_nm, respectively;

m optical fibers each having one end connected with a respective one of said light sources, the other end of each of said optical fibers being divided into n so as to guide the light from said light source emitting light of intensity corresponding to said S_i, to said portions of said optical filter having transmission factors corresponding to the absolute values of said a_1i, a_2i, . . . , a_ni (i=1, . . . , m), equally in amount; and

n photoelectric converting units each receiving light beams transmitted through said portions of said optical filter having transmission factors corresponding to absolute values of said a_i1, . . . , a_im, and converting said light beams into electrical signals corresponding, in intensity, to said S_i '"'"' (i=1, . . . , n), respectively.

6. An optical operation apparatus according to claim 5, further comprising optical fibers for connecting said optical filter with said photoelectric converting units.

7. An optical operation apparatus according to claim 5, wherein at least one of of said photoelectric converting units has at least a first light-receiving portion for detecting the light transmitted through at least one said portion, if any, corresponding to at least one of said a₁₁, . . . , a_nm which has a positive value, at least a second light-receiving portion for detecting the light transmitted through at least one said portion, if any, corresponding to at least one of said a₁₁, . . . , a_nm which has a negative value, and means for subtracting the signal detected by said second light-receiving portion from that detected by said first light-receiving portion.

8. A optical operation apparatus according to claim 5, wherein said S₁, S₂, . . . , S_m are color signals and said S₁ '"'"', S₂ '"'"', . . . , S_n '"'"' are compensated color signals.

9. An optical operation apparatus for effecting the following operation:

##EQU5## (n and m are integers each equal to or greater than

     2), said apparatus comprising;

an optical filter having two opposite faces and m×

n portions having transmission factors corresponding to absolute values of said a₁₁, . . . , a_nm, respectively, said portions being arranged in a predetermined direction and a direction perpendicular thereto in the form of a matrix;

m light sources emitting lights of intensities corresponding to said S₁, S₂, . . . , S_m, respectively, and provided on one of the two faces of said optical filter in contact therewith, each of said light sources having a light-emitting surface of the same length as said optical filter in the direction perpendicular to said predetermined direction and said light sources being arranged along said predetermined direction; and

n photoelectric converting units each receiving light beams transmitted through said portions of said optical filter having transmission factors corresponding to absolute values of said a_i1, . . . , a_im, and converting said light beams into electrical signals corresponding, in intensity, to said S_i ;

(i=1, . . . , n), respectively.

10. An optical operation apparatus according to claim 9, wherein each of said light sources is a surface light emission type LED.

11. An optical operation apparatus according to claim 9, wherein at least one of said photoelectric converting units has at least a first light-receiving portion for detecting the light transmitted through at least one said portion corresponding to at least one of said a₁₁, . . . , a_nm which has positive value, at least a second light-receiving portion for detecting the light transmitted through at least one said portion corresponding to at least one of a₁₁, . . . , a_nm which has a negative value, and means for subtracting the signal detected by said second light-receiving portion.

12. An optical operation apparatus according to claim 11, wherein said s₁, S₂, . . . , S_m are color signals and said S₁ '"'"', S₂ '"'"', . . . , S_n '"'"', are compensated color signals.

13. An optical operation apparatus according to claim 9, wherein said photoelectric converting units are provided on the other of the two faces of said optical filter in contact therewith.

14. An optical operation apparatus for effecting the following operation:

##EQU6## said apparatus comprising;

four light sources emitting lights of intensities corresponding to a (unit signal), C, M and Y, respectively;

three modulating elements, each of said modulating elements receiving the light from said four light source and intensity-modulating said lights in accordance with C, M and Y signals, respectively;

an optical filter in which portions having transmission factors corresponding to the absolute values of said a₀₀, . . . , a₂₂ and b₀₀, . . . , b₂₅ are arranged in the form of a matrix and which receives the lights from said modulating elements;

a photoelectric converting element in which light-receiving portions corresponding to the respective portions of said optical filter are arranged in the form of a matrix and which detects the light transmitted through said optical filter; and

a signal processing circuit for adding and subtracting the outputs of said light-receiving portions and obtaining electrical signals corresponding to said C'"'"', M'"'"', and Y'"'"', respectively.

15. An optical operation apparatus for effecting the following operation;

##EQU7## (m=(n² +n)/2, n being integers equal to or greater than

     2), said apparatus comprising;

n light sources emitting lights of intensities corresponding to said S₁, S₂, . . . , S_n, respectively;

n modulating devices, each one of said devices receiving lights from said n light sources and intensity-modulating said light in accordance with signal of S_i (i=1, . . . , n);

an optical filter for receiving lights from said modulating devices, said optical filter having m×

n portions having transmission factors corresponding to absolute values of said a₁₁, . . . , a_nm, respectively, and arranged in the form of a matrix;

a photoelectric converting device having light-receiving portions corresponding to said respective portions of said optical filter and arranged in the form of a matrix, said light-receiving portions detecting the light transmitted through said corresponding portions of said optical filter, respectively; and

a signal processing circuit for adding and subtracting outputs of said light-receiving portions and obtaining signals corresponding, in intensity, to said S₁ '"'"', S₂ '"'"', . . . , S_m '"'"', respectively, said portions of said optical filter receiving the lights from said modulating devices in such a manner that said signal processing circuit can obtain said signals.

16. An optical operation apparatus according to claim 15, wherein said modulating device is a diffraction type light modulating element which diffracts the lights from said light sources.

17. An optical operation apparatus according to claim 16, wherein the light from said n light sources is caused to be incident on said diffraction type light modulating element at mutually different angles.

18. An optical operation apparatus according to claim 16, wherein the lights from said n light sources have mutually different wavelengths.

19. An optical operation apparatus according to claim 16, wherein said diffraction type light modulating element is an acousto-optical element, and the signals of said S₁, S₂, . . . , S_n are input to said acousto-optical element with the frequencies thereof being made different and multiplex.

20. An optical operation apparatus according to claim 16, wherein each of the lights emitted from said light sources is coupled to a thin film light waveguide, and said acoustic-optical element is provided in said thin film light waveguide.

21. An optical operation apparatus according to claim 15, wherein said diffraction type light modulating element is an electro-optical element.

22. An optical operation apparatus for effecting the following operation:

##EQU8## (m=(n² +n)/2, n being integers equal to or greater than

     2), said apparatus comprising;

n light sources emitting lights of intensities corresponding to said S₁, S₂, . . . , S_n, respectively;

n modulating devices, each one of said devices receiving lights from said n light source and intensity-modulating said lights in accordance with signal of S_i (i=1, . . . , n);

an optical filter for receiving lights from said modulating devices, said optical filter having m portions having different transmission factors and the transmission factors of said m portions of said optical filter being changed to correspond to said a_i1, a_i2, . . . , a_im (i=1, . . . , n);

a photoelectric converting device having m light-receiving portions corresponding to said respective portions of said optical filter detecting for detecting the lights transmitted through said optical filter; and

a signal processing circuit for adding and subtracting outputs of said light-receiving portions and obtaining signals corresponding, intensity, to said S_i '"'"', when said transmission factors are changed to correspond to a₁₁, a₁₂, . . . , a_im (i=1, . . . , n), said portions of said optical filter receiving the lights from said modulating devices in such a manner that said signal processing circuit can obtain said signals.

23. An optical operation apparatus according to claim 22, wherein said modulating device is a diffraction type light modulating element which diffracts the lights from said light sources.

24. An optical operation apparatus according to claim 23, wherein the lights from said n light sources are caused to be incident on said diffraction type light modulating element at mutually different angles.

25. An optical operation apparatus according to claim 23, wherein the lights from said n light sources have mutually different wavelengths.

26. An optical operation apparatus according to claim 23, wherein said diffraction type light modulating element is an acousto-optical element, and the signals of said S₁, S₂, . . . , S_n are input to said acousto-optical element with the frequencies thereof being made different and multiplex.

27. An optical operation apparatus according to claim 23, wherein each of the lights emitted from said light sources is coupled to a thin film light waveguide, and said acousto-optical element is provided in said thin film light waveguide.

28. An optical operation apparatus according to claim 23, wherein said diffraction type light modulating element is an electro-optical element.

29. An optical operation apparatus according to claim 22, wherein said portions of said optical filter and said m light-receiving portions of said photoelectric converting device are arranged in the form of a matrix, respectively.

30. An optical operation apparatus for effecting the following operation:

##EQU9## said apparatus comprising;

three light source emitting lights of intensities corresponding to said C, M and Y, respectively;

four modulating elements, each of said modulating elements receiving the lights from said three light sources, three of said four modulating elements intensity-modulating said lights in accordance with C, M, Y and l (unit signal) signals and one of said four modulating elements transmitting said lights without any intensity-modulation;

an optical filter in which portions having transmission factors corresponding to the absolute values of said a₀₀, . . . , a₂₂ and b₀₀, . . . , b₂₅ are arranged in the form of a matrix and which receives the lights from said modulating elements;

a photoelectric converting element in which light-receiving portions corresponding to the respective portions of said optical filter are arranged in the form of a matrix and which detects the lights transmitted through said optical filter; and

a signal processing circuit for adding and subtracting the outputs of said light-receiving portions and obtaining electrical signals corresponding to said C'"'"', M'"'"' and Y'"'"', respectively.

31. An optical operation apparatus for effecting the following operation:

##EQU10## (n and m are integers each equal to or greater than

     2), said apparatus comprising;

m light sources emitting light beams of intensities corresponding to said S₁, S₂, . . . , S_m, respectively;

an optical filter having m×

n portions having transmission factors corresponding to absolute values of said a₁₁, . . . , a_nm, respectively;

n photoelectric converting units each receiving light beams transmitted through said portions of said optical filter having transmission factors corresponding to absolute values of said a_i1, . . . , a_im, and converting the light beams into electrical signals corresponding, in intensity, to said S_i '"'"' (i=1, . . . , n), respectively; and

n optical fibers each having one end connected with a respective one of said photoelectric converting units, the other end of each of said optical fibers being divided into m so as to guide the light beams transmitted through said portions of said optical filter having the transmission factors corresponding to said a_i1, a_i2, . . . , a_im (i=1, . . . , n) to said photoelectric converting unit for outputting the electrical signal corresponding to said S_i '"'"'.