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E39-L109 Datasheet(PDF) 6 Page - Omron Electronics LLC |
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E39-L109 Datasheet(HTML) 6 Page - Omron Electronics LLC |
6 / 10 page A-202 Standard Photoelectric Sensors Technical Guide Glossiness When light is applied to the sensing object, the reflected light is generally a mixture of regular reflection components and diffuse reflection components. Glossiness is directly propor- tional to the light intensity of the regular reflection compo- nents. In JIS, the glossiness of a glass plate surface having 1.567 reflectivity is defined 100 as the basis of glossiness. Glossiness of Typical Object Sensed by E3X-NL11 + E32- S15 Sensing of Transparent Objects with Rotating Fiber Unit Mounting Bracket There are transparent films and transparent plastic objects that change the direction of polarized light when it passes through the transparent films and transparent plastic objects. When E3X-NL senses these transparent films and transpar- ent plastic objects on glossy background objects, such as glossy paper or metals, E3X-NL will not sense these objects smoothly in case of an incorrect angle of the sensor head. The most suitable angle of the sensor head varies with the trans- parent object. The angle of the sensor head can be, however, 0° or 45° for the smooth sensing of such transparent objects due to the characteristic of polarized light. There is no need for the angle to be midway between 0° and 45°. E39-L109, which is sold separately, is a mounting bracket that rotates to angles of 0° or 45° and enables E3X-NL to sense such trans- parent objects smoothly with its sensing head set at 0° or 45° without changing the sensing positive. Fuzzy Teaching Function E3X-NL in two-point teaching operation will perform fuzzy computation using the difference in glossiness and the differ- ence in light energy between the two teaching points to deter- mine the thresholds setting with E3X-NL. As shown in the following table, if there is only a small difference in glossiness but there is a large difference in light energy between the two teaching points, the thresholds set with E3X-NL will be deter- mined by the light energy values. Countermeasures against Teaching Errors Resulted with Transparent Labels on Sheets The material of the sheets must not be too glossy. Nomenclature: 1,000 100 10 Object no. 1 23456789 10 1. White paper 2. Brown corrugated cardboard 3. Paper gummed tape 4. White glossy paper (individu- al packages for OMRON sensors) 5. Blue mount paper for label 6. Transparent label on blue mount paper 7. Glossy plastic 8. Transparent glass (t=1 mm) 9. Gold printing ink (Gold part of Cabin Mild Box) 10. Metal mirror surface (SUS mirror surface) Taught Difference in glossiness between two teaching points Taught Difference in light energy between two teaching points Discriminating method Large Large Discriminated by glossiness. Large Small Discriminated by glossiness. Small Large Discriminated by light energy. Small Small Discriminated by glossiness. A teaching error will result if the dif- ference in glossiness and that in light energy are both less than the sensing levels of E3X-NL. (Example) Metal cylindrical object coated with transparent film Metal cylindrical object coated with transparent film Sensing head The object can be sensed smoothly when the angle of the sensing head is either 0˚ or 45˚. 45˚ Operation indicator (orange) Teaching button Mode selector Stability indicator (green) Teaching indicator (red/green) Operation mode selector Discriminated by glossiness Fuzzy discrimination of glossiness and light energy Discriminated by light energy Difference in light energy Large Small Teaching error |
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