JPS559568A - Focal plate using phase type diffraction grating - Google Patents
Focal plate using phase type diffraction gratingInfo
- Publication number
- JPS559568A JPS559568A JP8258478A JP8258478A JPS559568A JP S559568 A JPS559568 A JP S559568A JP 8258478 A JP8258478 A JP 8258478A JP 8258478 A JP8258478 A JP 8258478A JP S559568 A JPS559568 A JP S559568A
- Authority
- JP
- Japan
- Prior art keywords
- diffracted light
- diffraction grating
- focal plate
- crests
- bright
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To obtain the defocus image of a bright visual field, easy focusing and of a natural state to be obtained by leaving zero-order diffracted light within the range where the intensity ratios to total diffracted light become the specific ratios.
CONSTITUTION: Unit patterns having two square shape crests are arrayed in multiplicity in square form on one surface of a focal plate 1. Now, when a signal color spot light source of, e.g., a wavelength λ=550 mm is used and the image of said light source by this focal plate 1 is observed, the bright and natural defocus image may be observed if the values of the area ratio γh that the portions of the crests of the diffraction grating occupy in the entire part of the diffraction grating of the focal plate are taken at 0.66, 0.77 in the boundary region of the phase differences θ=π by the combinations indicated by the shaded part of the graph, e.g., the portions of the crests and troughs of light. The intensity ratios R0 of this time are 12%, 33%. Namely, if the 0 order diffracted light is left within the range where the intensity ratios to the total diffracted light become 5% to 50%, the bright and natural defocus images may be obtained.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8258478A JPS559568A (en) | 1978-07-06 | 1978-07-06 | Focal plate using phase type diffraction grating |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8258478A JPS559568A (en) | 1978-07-06 | 1978-07-06 | Focal plate using phase type diffraction grating |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS559568A true JPS559568A (en) | 1980-01-23 |
Family
ID=13778521
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8258478A Pending JPS559568A (en) | 1978-07-06 | 1978-07-06 | Focal plate using phase type diffraction grating |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS559568A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5713402A (en) * | 1980-06-27 | 1982-01-23 | Canon Inc | Diffusing plate |
US4336989A (en) * | 1979-11-29 | 1982-06-29 | Canon Kabushiki Kaisha | Focusing screen |
US4598977A (en) * | 1980-08-26 | 1986-07-08 | Minolta Camera Kabushiki Kaisha | Bi-level phase grating focusing plate |
US4697878A (en) * | 1984-03-01 | 1987-10-06 | Minolta Camera Kabushiki Kaisha | Bi-level focusing plate of phase grating type |
JPS62238520A (en) * | 1986-04-10 | 1987-10-19 | Canon Inc | Optical modulator |
US5089835A (en) * | 1989-02-28 | 1992-02-18 | Canon Kabushiki Kaisha | Phase-type diffusing plate |
JPH0453606A (en) * | 1990-06-15 | 1992-02-21 | Riken Seiki Kk | Collet chuck fitter and formation thereof |
US5161058A (en) * | 1988-05-31 | 1992-11-03 | Canon Kabushiki Kaisha | Focusing screen |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5216226A (en) * | 1975-07-28 | 1977-02-07 | Canon Inc | Focusing device |
-
1978
- 1978-07-06 JP JP8258478A patent/JPS559568A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5216226A (en) * | 1975-07-28 | 1977-02-07 | Canon Inc | Focusing device |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4336989A (en) * | 1979-11-29 | 1982-06-29 | Canon Kabushiki Kaisha | Focusing screen |
JPS5713402A (en) * | 1980-06-27 | 1982-01-23 | Canon Inc | Diffusing plate |
US4598977A (en) * | 1980-08-26 | 1986-07-08 | Minolta Camera Kabushiki Kaisha | Bi-level phase grating focusing plate |
US4697878A (en) * | 1984-03-01 | 1987-10-06 | Minolta Camera Kabushiki Kaisha | Bi-level focusing plate of phase grating type |
JPS62238520A (en) * | 1986-04-10 | 1987-10-19 | Canon Inc | Optical modulator |
US5161058A (en) * | 1988-05-31 | 1992-11-03 | Canon Kabushiki Kaisha | Focusing screen |
US5089835A (en) * | 1989-02-28 | 1992-02-18 | Canon Kabushiki Kaisha | Phase-type diffusing plate |
JPH0453606A (en) * | 1990-06-15 | 1992-02-21 | Riken Seiki Kk | Collet chuck fitter and formation thereof |
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