Patent ID: 6437333
Filing Date: 2002-08-20
Classification: H05K

Abstract:
A holding apparatus comprising:a suction nozzle which applies a negative pressure to a back surface of an object and thereby holds the object; a front-surface lighting device which emits a first visible light toward a front surface of the object held by the suction nozzle and thereby lights the front surface of the object so that the first visible light forms an image of the front surface of the object; and a back-surface lighting device which lights the back surface of the object held by the suction nozzle and which includes: (a) a light emitting plate which is provided around a base portion of the suction nozzle and emits a second light from a light emitting surface thereof facing a vicinity of a free end of the suction nozzle that holds the object; and (b) a black infrared-ray transmitting filter which covers the light emitting surface of the light emitting plate, and transmits infrared rays of the second light so that the infrared rays light the back surface of the object and thereby forms a silhouette image of the object, wherein when the front surface lighting device emits the first visible light toward the front surface of the object, the light emitting plate does not emit the second light, and the black infrared-ray transmitting filter does not transmit the infrared rays, and does not reflect the first visible light, thereby forming a black background of the image of the front surface of the object formed by the first visible light, and wherein when the light emitting plate emits the second light, and the black infrared ray transmitting filter transmits the infrared rays, thereby forming the silhouette image of the object, the front-surface lighting device does not emit the first visible light toward the front surface of the object.