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1. 发明专利

JPH0422040A CATHODE-RAY TUBE PROJECTOR AND COOLING LIQUID USED THEREFOR 失效
公开(公告)号：JPH0422040A
公开(公告)日：1992-01-27
申请号：JP12578590
申请日：1990-05-16
申请人： HITACHI CHEMICAL CO LTD , HITACHI LTD
发明人： OKINAKA TAKAAKI , KANEGA FUMIAKI , MURANAKA MASAYUKI , YOSHIZAKI ISAO
IPC分类号： H01J29/89 , H01J7/24 , H04N9/31
摘要： PURPOSE:To prevent the whitening of a plastic lens and deterioration in optical function due to coloring and the like of a cooling liquid even when used for a long time by using a cooling liquid comprising polyhydric alcohol and of water soluble polymer, and whose amount of the water soluble polymer is specified. CONSTITUTION:A cooling liquid comprising polyatomic alcohol and water soluble polymer, whose amount of water soluble polymer is 0.0001-4.5weight%, is used. Ethylene glycol or diethylene glycol and the like is used as polyatomic alcohol, and it is preferred that at least two species are mixed together, in consideration of a freezing point for the use in a cold region. As water soluble polymer, polyvinyl alcohol, methylcellulose and so on, can be used. The amount of water soluble polymer is preferred to be in a range of 0.001-4.5weight%, and more preferably, it should be in a range of 0.1-2weight%. The whitening of a plastic lens, and the deterioration in optical function due to the coloring of a cooling liquid and the like does not occur, even when used for a long time.

2. 发明专利

JPH0359932A CATHODE-RAY TUBE 失效
公开(公告)号：JPH0359932A
公开(公告)日：1991-03-14
申请号：JP19251789
申请日：1989-07-27
申请人： HITACHI LTD
发明人： YOSHIZAKI ISAO , KURIHARA RYUJI
IPC分类号： H01J29/92
摘要： PURPOSE:To reduce the possibility of air entering into an adhesive or between the adhesive and the outer face of a glass tube so as to enhance insulation between an anode and an earth or between the anode and a low electric potential portion by fixing an anode cap to an anode button portion, and then injecting an adhesive by means of an injection nozzle. CONSTITUTION:An anode cap 4 is fitted over an anode button 3 and a hook 5 is engaged with the recessed portion of the anode button 3. As a result, the anode cap 4 is fixed to the anode button portion because of its resiliency and the hook 5. An injection nozzle 7 is inserted into the injection opening 4a of the anode cap 4 and an adhesive 6 is injected by the injection nozzle 7 into a space 8 defined by the inner face of the anode cap 4 and the outer face of a glass tube 1, so that the space 8 is filled with the adhesive 6. The possibility of air entering into the adhesive 6 or between the adhesive 6 and the outer face of the glass tube 1 is thereby reduced to enhance the insulation between the anode and earth or between the anode and a low electric potential portion.

3. 发明专利

JPH0350592A PROJECTION TYPE IMAGE DISPLAY DEVICE AND ITS LENS 失效
公开(公告)号：JPH0350592A
公开(公告)日：1991-03-05
申请号：JP18460389
申请日：1989-07-19
申请人： HITACHI LTD
发明人： YOSHIDA TAKAHIKO , HIRATA KOJI , YOSHIKAWA HIROKI , YOSHIZAKI ISAO , INAOKA SHIGERU
IPC分类号： G02B13/16 , G02B13/18 , G09F9/00
摘要： PURPOSE:To obtain the image display device which has a wide color presentation range and excellent focus characteristics by providing a filter which differs in transmissivity according to the wavelength of light on a lens surface which is nearly convex to a video source out of lens surfaces of lens elements constituting a projection type lens. CONSTITUTION:A filter which differs in transmissivity according to wavelength, preferably, a multi-layered film interference filter 11 is provided on the lens surface which is nearly convex to the video source out of the lens surfaces of the lens elements 1 - 4, i.e. the lens incidence surface of the 3rd lens 3 on the cathode-ray tube side which is convex to a cathode ray tube. The transmissivity of the multi-layered film interference filter 1 to light is made large to green light and small to red light. Then, the multi-layered film interference filter 11 is applied to the projection lens for the green projection type cathode-ray tube to correct the chromaticity coordinates of green on a screen. Consequently, the representation range of colors is expanded and the focus characteristics are improved.

4. 发明专利

JPH01250916A PROJECTION LENS 失效
公开(公告)号：JPH01250916A
公开(公告)日：1989-10-05
申请号：JP8507088
申请日：1988-04-08
申请人： HITACHI LTD
发明人： HIRATA KOJI , FUKUDA KYOHEI , YOSHIKAWA HIROKI , MORI SHIGERU , MURANAKA MASAYUKI , YOSHIZAKI ISAO , INAOKA SHIGERU , JITSUKATA HIROSHI
IPC分类号： G02B13/16 , G02B9/34 , G02B13/18
摘要： PURPOSE:To realize a high focus by constituting the title lens of four groups containing a meniscus lens whose both faces are both convex faces against a screen, a biconvex positive lens, a lens which has a biconvex center part and weak positive refracting power, and a negative lens having a concave face on the screen side, and allowing the respective lens groups to satisfy the specific conditions. CONSTITUTION:The title lens is constituted of a first group containing a meniscus lens whose both faces are both convex faces against a screen, a second group containing a biconvex positive lens, a third group containing a lens which has a biconvex center part and weak positive refracting power, and the fourth group containing a negative lens having a concave face on the screen side in order from the screen side, and allowed to satisfy the conditions of the expression I. In the expression I, f0 and f1-f4 denote a focal distance of the whole lens system, and focal distances of the first-the fourth groups, respectively. In such a way, the contrast of a projected image is improved remarkably, and also, an optical system whose focus performance in the center part and the peripheral part of the screen is excellent can be realized.

5. 发明专利

JPS63184731A BACK PROJECTION TYPE SCREEN 失效
公开(公告)号：JPS63184731A
公开(公告)日：1988-07-30
申请号：JP1607987
申请日：1987-01-28
申请人： HITACHI LTD
发明人： SHIYUUGISONO OSAMU , YOSHIZAKI ISAO , IWAHARA YUKIAKI
IPC分类号： G03B21/62 , G03B21/625
摘要： PURPOSE:To prevent a back projection type screen from generating flaw defects by applying lubricant to the surface of an acrylic plate contacted with the other acrylic plate out of two or more superposed acrylic plates. CONSTITUTION:A front sheet 2 is arranged on the observer side and a Fresnel sheet 1 is arranged on the projection lens side. Namely, the front sheet 2 consists of a horizontal renticular lens 5 formed on one side and a black stripe 6 formed on the other side and the lens 5 is arranged on the Fresnel sheet 1 side. The Fresnel sheet 1 consists of a Fresnel lens 4 formed on one side and a vertical renticular lens formed on the other face and the Fresnel lens 4 is arranged on the front sheet 2 side. Since frictional force between the two superposed acrylic plates can be reduced by applying silicone oil 3 for lubricant to the horizontal renticular face of the front sheet 2, the screen can be prevented from generating flaw detects due to the frictional force.

6. 发明专利

JP2000137293A TRANSMISSION SCREEN 失效
公开(公告)号：JP2000137293A
公开(公告)日：2000-05-16
申请号：JP34194599
申请日：1999-12-01
申请人： HITACHI LTD
发明人： YOSHIDA TAKAHIKO , HIRATA KOJI , YOSHIKAWA HIROKI , MURANAKA MASAYUKI , YOSHIZAKI ISAO
IPC分类号： G03B21/62 , G03B21/625
摘要： PROBLEM TO BE SOLVED: To improve the focusing characteristics and the contrast of a picture in a transmission screen. SOLUTION: A transmission screen 1 is constituted of the following three sheets of a Frensnel sheet 2, a lenticular sheet 3 and a light absorbing sheet 4. Light diffusions in the vertical direction of a screen are mainly performed by the incident plane 21 of the Frensnel sheet 2 or the incident plane 41 of the light absorbing sheet 4 or the lenticular sheet 3 which is provided between the two sheets 2, 4 and which makes the horizontal direction of the screen its longitudinal direction. Moreover, the transmission screen is constituted so as to attenuate light which passes through the inside of the light absorbing sheet 4 and which is to be emitted from a light emission surface 42, for example, by coloring the light absorbing sheet 4 among these three sheets. Consequently, when there are outer lights such as an illuminating light or the like, the ratio of lost lights of the outer lights becomes larger lights by an amount lost when the outer lights make a round trip through the light absorbing sheet 4 compared with the case of the projector so that the contrast of the picture is improved.

7. 发明专利

JPH10260345A LENS DEVICE FOR PROJECTION 失效
公开(公告)号：JPH10260345A
公开(公告)日：1998-09-29
申请号：JP12306798
申请日：1998-05-06
申请人： HITACHI LTD
发明人： HIRATA KOJI , YOSHIKAWA HIROKI , YOSHIDA TAKAHIKO , MURANAKA MASAYUKI , WADA KIYOSHI , YOSHIZAKI ISAO
IPC分类号： G02B13/00 , G02B13/18
摘要： PROBLEM TO BE SOLVED: To reduce the influence of variations of temperature and humidity on focus performance by providing light diverging operation for the peripheral part of a 1st lens and light converging operation for the peripheral part of a 2nd lens. SOLUTION: This device includes the 1st plastic lens which is so constituted that its peripheral part which is radially distant from the center part including the optical axis has a concave surface on its screen side, and the 2nd plastic lens which is positioned on the image generation source side of the 1st plastic lens and so constituted that its peripheral part which is radially distant from the center part including the optical axis has a convex surface on its screen side. In this case, a lens of five-group, six-element constitution using a cemented convex lens is used as a projection lens 2 corresponding to a green cathode-ray tube and projection lenses of four elements in four groups are used as projection lenses 1 and 3 corresponding to a blue and a red cathode-ray tube. Thus, the peripheral part of the 1st lens is able to diverge light and the peripheral part of the 2nd lens is able to converge light.

8. 发明专利

JPH0758382B2 失效
公开(公告)号：JPH0758382B2
公开(公告)日：1995-06-21
申请号：JP1607987
申请日：1987-01-28
申请人： HITACHI LTD
发明人： SHUGIEN OSAMU , YOSHIZAKI ISAO , IWAHARA YUKIAKI
IPC分类号： G03B21/62 , G03B21/625

9. 发明专利

JPH0395512A PROJECTION LENS 失效
公开(公告)号：JPH0395512A
公开(公告)日：1991-04-19
申请号：JP23159989
申请日：1989-09-08
申请人： HITACHI LTD
发明人： HIRATA KOJI , YOSHIKAWA HIROKI , YOSHIDA TAKAHIKO , MURANAKA MASAYUKI , WADA KIYOSHI , YOSHIZAKI ISAO , INAOKA SHIGERU
IPC分类号： G02B13/16 , G02B13/18
摘要： PURPOSE:To obtain the bright projection lens which has a wide view angle by composing the lens system of six lens elements in five groups and composing a 3rd group of a high-dispersion concave lens and a low-dispersion convex lens. CONSTITUTION:The lens system consists of six elements in five groups, i.e. a 1st convex lens group 8, a 2nd lens group 7 with relatively weak refracting power, the 3rd cemented lens group 6 with has the majority of the positive refracting power of the whole system, a 4th lens group 5 with relatively weak refracting power, and a 5th lens group 4 which is concave to the screen side in order from the screen side. Then the concave lens 6b in the 3rd group is formed by cementing the lens 6a of a high-dispersion material which has the largest positive refracting power and a =55 Abbe number. Consequently, the bright lens with the wide view angle is obtained and a sufficiently compact projection TV can be realized by using one mirror.

10. 发明专利

JPS63195931A CATHODE-RAY TUBE PROJECTOR 失效
公开(公告)号：JPS63195931A
公开(公告)日：1988-08-15
申请号：JP2627087
申请日：1987-02-09
申请人： HITACHI LTD
发明人： MURANAKA MASAYUKI , MORI SHIGERU , YOSHIZAKI ISAO , WADA KIYOSHI , TAKESHITA MASAMICHI
IPC分类号： H01J29/89 , H01J7/26
摘要： PURPOSE:To avoid an increase in the quantity of parts so as to suppress a rise in costs and to prevent X rays from leaking by using a liquid, in which a material with X-ray absorptivity is dissolved, as a cooling liquid. CONSTITUTION:X-ray absorptivity is given to a cooling transparent liquid 10 which is sealed in a gap formed between a front panel 2 of a cathode-ray tube and a concave lens 4. Because the X-ray absorptivity increases in proportion to four powers of an atomic number of a material and in proportion to the quantity (concentration, thickness) of atoms, the atom of large atomic number is selected in the range in which characteristics required for a cooling liquid 10 do not disappear, and the amount enough to obtain desired absorptivity is dissolved. A simple substance or mixture of ethylene glycol, diethylene glycol, and the like is used as the cooling liquid 10. Hence, since the front of the front panel is screened wholly, reliability in safety of X rays can be upgraded.

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