1 PHOTOELECTRIC SENSORS
2 GLOSSARY
3 Term
4 Description
5 Beam envelope
6 Beam axis
7 Beam envelope: Beam spread
8 Beam axis: The center axis of light beam
9 Sensor
10 Sensing axis
11 The center axis between the emitted beam axis and the received beam axis.
12 For the thru-beam type sensor, it is identical to the beam axis.
13 Received beam axis
14 Emitted beam axis
15 Sensing axis
16 Sensing range
17 Distance to convergent point
18 Thru-beam type
19 The distance which can be set between the emitter and the receiver under the stable sensing condition.
20 (The abbreviation “0 ~” is set for values starting from 0.)
21 Sensing range
22 Emitter
23 Receiver
24 Retroreflective type
25 The distance which can be set between the sensor and the reflector under the stable sensing condition.
26 Reflector
27 Reflective type
28 "The distance which can be set between the sensor and the standard sensing object (normally, white non-glossy
paper) under the stable sensing condition."
29 Standard sensing object
30 Distance to convergent point:
31 With the convergent reflective type sensor or the mark sensor, sensitivity is not proportional to the setting distance and the maximum sensitivity point is at an intermediate position.
32 This point at which the sensitivity is maximum is called the convergent point and is specified along with the sensing range.
33 Sensing area
34 Sensitivity
35 Convergent reflective type
36 Diffuse reflective type
37 Convergent point
38 Setting distance
39 The standard sensing object for determining the basic specifications of reflective type sensors.
40 Normally, it is white non-glossy paper, but some particular sensors use other objects to suit the application. (e.g., glass)
41 Minimum sensing object
42 The minimum object size that the sensor can detect under the specified conditions.
43 In the thrubeam type and the retroreflective type, the size of an opaque object (completely beam interrupted object) is specified.
44 In the diffuse reflective type, the diameter of a gold wire or a copper wire is specified.
45 (øxxx mm øxxx in value is expressed)
46 øa mm
47 øa in
48 Hysteresis
49 For a reflective sensor, the hysteresis is the difference between the operation distance, when the output first results in light-ON with the standard sensing object approaching along the sensing axis, and the resumption distance, when the output first results in light-OFF with the standard sensing object receding.
50 It is displayed as a percentage (%) versus the operation distance.
51 The movement distance is displayed as a percentage (%).
52 Hysteresis prevents output instability caused by vibrations in the sensing object.
53 Operation distance
54 Resumption distance
55 Repeatability
56 The difference in the operating position when operation is repeated under constant conditions.
57 Approach perpendicular to sensing axis
58 Approach along sensing axis
59 Response time
60 The time lag between a change in the sensing state and the turning ON / OFF of the sensing output.
61 Sensing condition
62 Output operation
63 Beam-received
64 Beam-interrupted
65 ON
66 OFF
67 t: Response time
68 Ambient illuminance
69 The maximum ambient light intensity that does not cause sensor malfunction.
70 It is expressed as the permissible light intensity at the light receiving face.
71 The illuminance is stipulated to be an incandescent lamp.
72 * Sunlight has two or three times the illuminance of an incandescent lamp.
73 Before use, refer to “Influence of extraneous light” (p.1459) described in “PRECAUTIONS FOR PROPER USE”.
74 Illuminance meter
75 Light source (Incandescent lamp)
76 Pressure Sensors
77 Flow Sensors
78 Inductive Proximity Sensors
79 Displacement Sensors
80 Electrostatic Sensors
81 Static Removers
82 About Laser Beam
83 General Precautions