JPS5616119A - Reflective screen - Google Patents

Reflective screen

Info

Publication number
JPS5616119A
JPS5616119A JP9246379A JP9246379A JPS5616119A JP S5616119 A JPS5616119 A JP S5616119A JP 9246379 A JP9246379 A JP 9246379A JP 9246379 A JP9246379 A JP 9246379A JP S5616119 A JPS5616119 A JP S5616119A
Authority
JP
Japan
Prior art keywords
diffusion angle
screen
angles
reflection
faces
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP9246379A
Other languages
Japanese (ja)
Inventor
Susumu Kodama
Masakazu Yokoi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP9246379A priority Critical patent/JPS5616119A/en
Publication of JPS5616119A publication Critical patent/JPS5616119A/en
Pending legal-status Critical Current

Links

Landscapes

  • Overhead Projectors And Projection Screens (AREA)

Abstract

PURPOSE: To make brightness fixed within the diffusion angle without loss of light energy, by forming the reflection face of the screen by arranging regularly many units having minute spherical faces which are curved concavely or convexly in the horizontal direction and the vertical direction.
CONSTITUTION: In the partial expanded figure of a reflective screen, many units 9 having minute spherical faces 8 where reflection faces 7 are curved convexly (or concavely) in the horizontal direction and the vertical direction are arranged regularly. Then, diffusion angle ±θH in the horizontal direction of the reflective screen and diffusion angle ±θV in the vertical direction are equal to angles θa and θb made by normal curves 11a and 11b of both ends of arc 11 in the horizontal section direction and the vertical section direction on the center line of respective spherical faces 8 of single substances 9 respectively. Consequently, diffusion angles ±θH and ±θV can be set to prescribed values arbitrarily by changing angles θa and θb made by normal curves 11a and 11b in relation to reflection directivity of the screen, and further, brightness within a set diffusion angle is fixed, and loss of light energy exists little.
COPYRIGHT: (C)1981,JPO&Japio
JP9246379A 1979-07-18 1979-07-18 Reflective screen Pending JPS5616119A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9246379A JPS5616119A (en) 1979-07-18 1979-07-18 Reflective screen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9246379A JPS5616119A (en) 1979-07-18 1979-07-18 Reflective screen

Publications (1)

Publication Number Publication Date
JPS5616119A true JPS5616119A (en) 1981-02-16

Family

ID=14055039

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9246379A Pending JPS5616119A (en) 1979-07-18 1979-07-18 Reflective screen

Country Status (1)

Country Link
JP (1) JPS5616119A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1271190A1 (en) * 2001-06-28 2003-01-02 Alps Electric Co., Ltd. Reflector and reflective liquid crystal display

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1271190A1 (en) * 2001-06-28 2003-01-02 Alps Electric Co., Ltd. Reflector and reflective liquid crystal display
US6695454B2 (en) 2001-06-28 2004-02-24 Alps Electric Co., Ltd. Reflector which exhibits good reflectance over wide angle range and liquid crystal display using the same
US6829094B2 (en) 2001-06-28 2004-12-07 Alps Electric Co., Ltd. Reflector which exhibits good reflectance over wide angle range and liquid crystal display using the same
US6863410B2 (en) 2001-06-28 2005-03-08 Alps Electric Co., Ltd. Reflector which exhibits good reflectance over wide angle range and liquid crystal display using the same

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