JPS6459146A - Luminous amount setting circuit - Google Patents
Luminous amount setting circuitInfo
- Publication number
- JPS6459146A JPS6459146A JP21712087A JP21712087A JPS6459146A JP S6459146 A JPS6459146 A JP S6459146A JP 21712087 A JP21712087 A JP 21712087A JP 21712087 A JP21712087 A JP 21712087A JP S6459146 A JPS6459146 A JP S6459146A
- Authority
- JP
- Japan
- Prior art keywords
- light
- circuit
- sensor
- coincide
- binary
- 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.)
- Granted
Links
Landscapes
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
PURPOSE:To enable the setting of the optimum quantity of light accurately in a short time, by a method wherein a video signal detected with a 1-D sensor by two thresholds is binary coded to measure the sum of high level range of the respective binary-coded signals within one scanning and both the results are made to coincide roughly with each other. CONSTITUTION:The quantity of light of a light source 16 is increased gradually with a quantity of light controlling circuit 3 and reflected light from the surface of a printed wiring plate 17 is received with a 1-D sensor. Then, a video signal from the sensor 1 is binary coded with binary coding measurement circuits 2a and 2b for different thresholds and measured values as sum of high level ranges are inputted into a rough incidence detection circuit 4. The circuit 4 increases the quantity of light of a light source 16 with a circuit 5 until the measured values coincide with each other. When they coincide, the increasing of the quantity of light is stopped. This enables the setting of the optimum quantity of light accurately in a short time to reduce an erroneous recognition rate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62217120A JPH0658330B2 (en) | 1987-08-31 | 1987-08-31 | Light intensity setting circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62217120A JPH0658330B2 (en) | 1987-08-31 | 1987-08-31 | Light intensity setting circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6459146A true JPS6459146A (en) | 1989-03-06 |
JPH0658330B2 JPH0658330B2 (en) | 1994-08-03 |
Family
ID=16699168
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62217120A Expired - Lifetime JPH0658330B2 (en) | 1987-08-31 | 1987-08-31 | Light intensity setting circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0658330B2 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6347453A (en) * | 1986-08-12 | 1988-02-29 | 元旦ビューティ工業株式会社 | Transverse shingled roof |
-
1987
- 1987-08-31 JP JP62217120A patent/JPH0658330B2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6347453A (en) * | 1986-08-12 | 1988-02-29 | 元旦ビューティ工業株式会社 | Transverse shingled roof |
Also Published As
Publication number | Publication date |
---|---|
JPH0658330B2 (en) | 1994-08-03 |
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