GB460508A - Improvements in maskings for projection screens - Google Patents

Improvements in maskings for projection screens

Info

Publication number
GB460508A
GB460508A GB2319736A GB2319736A GB460508A GB 460508 A GB460508 A GB 460508A GB 2319736 A GB2319736 A GB 2319736A GB 2319736 A GB2319736 A GB 2319736A GB 460508 A GB460508 A GB 460508A
Authority
GB
United Kingdom
Prior art keywords
lamps
reflector
spectators
masking
projection screens
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.)
Expired
Application number
GB2319736A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB2319736A priority Critical patent/GB460508A/en
Publication of GB460508A publication Critical patent/GB460508A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/13—Projectors for producing special effects at the edges of picture, e.g. blurring

Abstract

460,508. Projection screens. HARPER, M. Aug. 24, 1936, No. 23197. [Class 97 (i)] A masking is located in a plane in front of a projection screen, is illuminated so as to throw light towards the spectators, and has means to shield the visible area of the screen from light from the masking ; the light thrown may be of a neutral or grey tone. The Figure shows the margin of a projection screen E, a reflector A forming a mask, and one of a series of lamps B which are shielded from the spectators and illuminate the reflector surface C. The surface C may be grey, the lamps being clear, or the lamps may be tinted. A clear or mat glass D may exclude dust from the reflector. Specification 417,873 is referred to.
GB2319736A 1936-08-24 1936-08-24 Improvements in maskings for projection screens Expired GB460508A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2319736A GB460508A (en) 1936-08-24 1936-08-24 Improvements in maskings for projection screens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2319736A GB460508A (en) 1936-08-24 1936-08-24 Improvements in maskings for projection screens

Publications (1)

Publication Number Publication Date
GB460508A true GB460508A (en) 1937-01-28

Family

ID=10191723

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2319736A Expired GB460508A (en) 1936-08-24 1936-08-24 Improvements in maskings for projection screens

Country Status (1)

Country Link
GB (1) GB460508A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2598072A (en) * 1948-11-04 1952-05-27 Joseph K Rose Reflective mask for television cabinet fronts
US2665419A (en) * 1952-01-23 1954-01-05 Millard E Van Orden Television receiver
US2669708A (en) * 1949-04-28 1954-02-16 Du Mont Allen B Lab Inc Adjacent area illuminator for cathode-ray tubes
US2837734A (en) * 1952-05-29 1958-06-03 Sylvania Electric Prod Surround-lighting structure
DE1082937B (en) * 1956-06-23 1960-06-09 Erwin Koch Surrounding lighting for television receivers

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2598072A (en) * 1948-11-04 1952-05-27 Joseph K Rose Reflective mask for television cabinet fronts
US2669708A (en) * 1949-04-28 1954-02-16 Du Mont Allen B Lab Inc Adjacent area illuminator for cathode-ray tubes
US2665419A (en) * 1952-01-23 1954-01-05 Millard E Van Orden Television receiver
US2837734A (en) * 1952-05-29 1958-06-03 Sylvania Electric Prod Surround-lighting structure
DE1082937B (en) * 1956-06-23 1960-06-09 Erwin Koch Surrounding lighting for television receivers

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