Dai Nippon Printing Co., Ltd.

Hirofumi Hideshima

Akira Makita

Takayasu Komatsu

Toshihiro Hatori

Takuya Ogio

Yutaka Matsumoto

Hiroki Oka

Hiromitsu Ochiai

Toshimu Watanabe

In a shadow maskof pressing type, a large number of slots are made in a mask body in the horizontal direction and in the vertical direction. Each slot has a roughly rectangular backside opening, a roughly rectangular front-side opening, and a through-hole that connects these two openings. Between each slot of the multiple slots made in the mask body that is situated at least on either of the two diagonal axes of the mask body but in such a position that the angle at which electron beams enter the slot is 20 degrees or more and another slot that is arranged adjacently to the above slot in the vertical direction, a connecting part connecting the peripheral-side vertical outer edges of the front-side openings of these slots is provided so that it runs through a horizontal bridge part formed between the front-side openings of the slots.

Shadow mask having a slot structure that permits electron beams to enter at increased angles

In a shadow mask, a large number of slotsare made in a mask bodyin the horizontal direction X and in the vertical direction Y. Each slothas a roughly rectangular backside opening, a roughly rectangular front-side opening, and a through-holethat connects these two openings. Of the multiple slotsmade in the mask body, the slotssituated at least in those areas of the mask bodythat are surrounded by a horizontal axisand two diagonal axesthat pass through the center pointof the mask bodyhave such front-side openingsthat a pair of the upper and lower short sidesof the rectangular outline of the front-side openingof each slotare inclined, relative to the horizontal axis, along the radiate lineradiating from the center pointof the mask bodytoward the slot. The angle of inclination &#x3b2; of the short sidesis preferably in the range of a &#x3b1;&#xb1;10&#xb0;, where &#x3b1; is the angle between the radiate lineradiating from the center pointof the mask body toward the slotand the horizontal axis

Shadow mask with slots having a front side opening with an inclined from side edge

A slot tension-type shadow mask for the cathode-ray tube (CRT) has slots. Each slot has two openings and a pseudo-bridge between the two opening of the slot. The slots are formed in the X-Y plane that is formed away from the electron gun in the Z-axis. Each pseudo bridge has a pair of protuberances separated by a lacuna. The edges of each protuberance is etched to have various surface profiles in the X, Y, Z directions and/or the shape of the lacuna is also varied to provide effective shielding while overcoming various problems associated with heating and image imperfections appearing on the CRT screen.

Shadow mask for cathode ray tube

The present invention provides a shadow mask having an improved resistance to an impact such as vibration or dropping so as to keep a constant quality of a color cathode-ray tube. The object is achieved by a shadow mask in which throughholes are formed, each of the throughholesandhaving a rear side hole portionorthrough which an electron beam enters and a front side hole portionorthrough which the electron beam is emitted so as to form a beam spot having a prescribed shape on a surface to be irradiated; wherein, each of the throughholesandhas a ridge portionorformed by intersection of a taper surfaceorof the rear side hole portionorand a taper surfaceorof the front side hole portionor; the taper size T represented by a value a half the difference between the hole width S at endorof the front side hole portionorand the hole width Q at the ridge portionoris within a range of from 30 to 40% of the thickness t of the shadow mask; and the ridge portion is formed at a sectional height of up to 35 &#x3bc;m from the endof the rear side hole portionor

Shadow mask for a cathode ray tube

A shadow mask is formed from a plate member comprising an outer frame portion, a body portion of a shadow mask having an outer peripheral line formed through an etching process and a plurality of connection portions through which the body portion of the shadow mask is supported by the outer frame portion. The shadow mask is formed from the plate member by removing the outer frame portion from the body portion of the shadow mask. In this process, a break portion is formed to the shadow mask by removing the outer frame portion so as to be recessed inward from the outer peripheral line of the shadow mask.

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Tokyo-to, Japan

Hirofumi Hideshima