A dielectric sensing method and apparatus are provided for detection and classification of chemical and biological materials. The optoelectronic transceiver further including an optoelectronic receiving unit disposed along the optical axis and is disposed in bridge-like fashion above the optoelectronic transmitting unit. In addition, a meniscus holding force caused under compression is set stronger than the used-up ink-storage-portion negative pressure, and weaker than a meniscus holding force of a head filter.