Matsushita Electric Industrial Co., Ltd.

Syogo Horinouchi

Takashi Haruguchi

Yutaka Miyazono

Yuuji Terashima

Hideki Yoshinaka

Toshihiro Koga

Shigeki Takeuchi

Tadashi Shiraishi

Hidehiro Kugisaki

Jiro Mimasa

Kazuhiko Higo

Fumiaki Beppu

Kazumi Ootubo

Seiji Kimura

A light source beam is incident on an optical guide block and converted in its diffusion angle by a diffusion angle conversion film on a second inclined portion of the optical guide block, and reflected by a reflecting film on a first inclined portion. Then, the light is incident on a first beam splitter film on the second inclined portion and split into transmitted light and reflected light. The reflected light is focused an optical disk light reflected from the disc passes through the first beam splitter film, and then is transmitted and reflected by a second beam splitter film on a third inclined portion. This transmitted light is incident on a polarization plane conversion plate between the third inclined portion and a fourth inclined portion, so that P and S polarization components and are transmitted through and reflected by its polarized light splitting portion, respectively. The S polarization component is reflected by its reflecting surface toward light-receiving elements. The reflected light from the second beam splitter film is reflected by a focus error detection element on the second inclined portion, and an incident light-splitting point of the polarized light splitting portion is located between the center of the optical guide block and the light-receiving elements, thereby reducing a light amount loss and also increasing a Kerr rotation angle so that an RF reproduction signal with a high C/N ratio can be obtained.

Optical pickup incorporating an integrated optical guide member

A dot matrix printer of a dispersion printing type in which a printing noise is suppressed and dots arranged in longitudinal rows are driven while shifting the timing for every print wire dot. The present dot matrix printer is characterized by a construction in which respective print wires are driven at different timings within one pitch, and a space around a print head is surrounded by a housing and a platen, and a sound generated in the space is transmitted outside through walls. Further, the present dot matrix printer is characterized in that there is provided a memory storing printing intervals among the whole dots and print head conduction time, and the print head is driven in accordance with information read out of said memory in order to correct deviation of dot rows arranged in a longitudinal direction of the print head from perpendicularity. According to the present dot matrix printer, since the print head is driven at a high frequency by an inexpensive control unit, the noise frequency at printing with the print head becomes high, and the generated noise is transmitted outside through walls. Therefore, attenuation in a high-pitched tone compass is large through walls, thus exhibiting an effect that the operation sound of the printer leaking outside is made smaller.

Dot matrix printer with suppressed printing noises

Growing community of inventors

Fukuoka, Japan

Syogo Horinouchi