GB675549A - Improvements in magnifying viewers - Google Patents
Improvements in magnifying viewersInfo
- Publication number
- GB675549A GB675549A GB24480/50A GB2448050A GB675549A GB 675549 A GB675549 A GB 675549A GB 24480/50 A GB24480/50 A GB 24480/50A GB 2448050 A GB2448050 A GB 2448050A GB 675549 A GB675549 A GB 675549A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mirror
- transparent
- picture
- lamp
- height
- 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
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/02—Eyepieces; Magnifying glasses with means for illuminating object viewed
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Elements Other Than Lenses (AREA)
- Mirrors, Picture Frames, Photograph Stands, And Related Fastening Devices (AREA)
Abstract
675,549. Optical viewing devices. COPELAND, J. C. Oct. 6, 1950 [Oct. 28, 1949], No. 24480/50. Addition to 562,077. Class 97 (i). In an optical viewing device of the kind set out in the parent Specification, the height of the spherical mirror as measured at right angles to the axis of the mirror and in that axial plane which intersects the semi-transparent mirror at right angles is less than 0.94 times the focal length F of the spherical mirror. As shown in Fig. 1, the viewer comprises a lamp house 10 enclosing a lamp 11 and supporting a housing 12. The latter accommodates a semi-transparent mirror 22 and a front surface spherical mirror 25, and is apertured at 24. Supported between two glass or plastic sheets 20 in an aperture between the housings 10, 12 is the transparent or opaque picture which may be illuminated by a lamp 11 or lamps 36, 37. The supports 20 for the picture are movable under the control of a knob 19c by screw means 19. When the mirror 25 has a height greater than 0.94 F, masking plates are provided to block out parts thereof and reduce the height of the reflecting part of the mirror preferably to 0.8 F. Preferably, one of the mirrors 22, 25 has a curved top edge to permit said edge to follow closely the adjacent surface of the other mirror. In another form, the picture support is fixed and the spherical mirror is movable axially. Instead of providing lamps 11, 36 and 37 and the supports 20, a cathode-ray tube may be positioned with its screen in the aperture between the housings 10, 12.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US675549XA | 1949-10-28 | 1949-10-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB675549A true GB675549A (en) | 1952-07-09 |
Family
ID=22076785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB24480/50A Expired GB675549A (en) | 1949-10-28 | 1950-10-06 | Improvements in magnifying viewers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB675549A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49131462A (en) * | 1973-04-12 | 1974-12-17 | ||
| JPS5029049A (en) * | 1973-07-18 | 1975-03-24 | ||
| WO1989009423A1 (en) * | 1988-03-31 | 1989-10-05 | Laser 681 S.R.L. | Three-dimensional image projector |
-
1950
- 1950-10-06 GB GB24480/50A patent/GB675549A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49131462A (en) * | 1973-04-12 | 1974-12-17 | ||
| JPS5029049A (en) * | 1973-07-18 | 1975-03-24 | ||
| WO1989009423A1 (en) * | 1988-03-31 | 1989-10-05 | Laser 681 S.R.L. | Three-dimensional image projector |
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