Matsushita Electric Industrial Co., Ltd.

Ishihara

Kazuo Ueno

Takashi Inoue

Hiroyuki Nagano

Shuji Ueda

Osamu Adachi

Shohroh Mochida

Kiyoshi Saeki

Koki Nakabayashi

Shoro Mochida

Toshinori Ohtsuki

A low-cost wide-angle lens assembly being comprised of a decreased number of lenses yet capable of properly correcting optical aberrations. The second lens in each lens group from the minimum to the maximum horizontal viewing angle is commonly used, and the first lens in each lens group from a reference angle to the maximum horizontal viewing angle is commonly used, thus reducing the total number of required lenses. Aberrations are favorably corrected by satisfying predetermined conditions as to focal distances and back focuses of the lenses.

Wide-angle lens assembly and method

Light radiated from a light source is gathered by an oval mirror. The gathered light is incident on one end of a rod-shaped optical integrator, integrated and made uniform within the optical integrator, and is radiated from the other end of the optical integrator. The light from the optical integrator is diffused and projected on an exposure area of a display tube by a lens system. The lens system presents an astigmatism, thereby forming a first virtual focus and a second virtual focus on its virtual image area. The diffused light is apparently diffused vertically at the first virtual focus and apparently diffused horizontally at the second virtual focus. The first vertical focus and the second vertical focus correspond respectively in position to the positions of the vertical deflection means and horizontal deflection means of the display tube. Therefore, the directions of the exposure light beams which shed light on green, blue, and red dots are in agreement with the directions of the deflected electron beams. As a result, the deflected electron beams can sweep over the green, blue, and red dots accurately in synchronization with image signals.

Exposure equipment for display tube fabrication

A color electrostatic recording apparatus in which a color picture can be reproduced without misconvergence of colors through actuating a recording head to expand or contract and compensating the recording position of each image in accordance with the information of expansion/contraction and meandering of a recording medium which has been detected by reading register marks provided on the side edges of the recording medium.

Color electrostatic recording apparatus

Growing community of inventors

Neyagawa, Japan

Kazuo Ueno